WO2024087165A1

WO2024087165A1 - Overcurrent detection apparatus, protection apparatus, and anomaly early warning method

Info

Publication number: WO2024087165A1
Application number: PCT/CN2022/128231
Authority: WO
Inventors: 卢艳华; 余东旭
Original assignee: 宁德时代未来能源(上海)研究院有限公司
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2024-05-02

Abstract

The present application relates to an overcurrent detection apparatus, a protection apparatus, and an anomaly early warning method. The overcurrent detection apparatus comprises: a sampling unit, configured to sample a first measurement unit and obtain a first current value; a transceiver unit, configured to receive a second current value to an N-th current value from N-1 additional overcurrent detection apparatuses; a difference calculation unit, configured to calculate a first current difference to an (N-1)-th current difference, the first current difference to the (N-1)-th current difference respectively representing the current difference between the first current value and the second current value to the N-th current value; and an early warning output unit, configured to output a first early warning signal when the first current difference to the (N-1)-th current difference are respectively greater than a first difference threshold to an (N-1)-th difference threshold. The overcurrent detection apparatus can perform comparison of current values between a plurality of overcurrent detection apparatuses running in parallel, enhancing panoramic fault monitoring and early warning capabilities of a valve control system.

Description

Overcurrent detection device, protection device and abnormal warning method

Technical Field

The present application relates to the technical field of power system energy storage, and in particular to an overcurrent detection device, a protection device and an abnormality warning method.

Background technique

The new energy storage valve control system is the core control device of the new energy storage system. During the operation of the overcurrent detection device in the energy storage valve control system, communication interruption, program runaway, program bug, CPU crash, abnormal crash, etc. may occur, thus affecting the operation and withdrawal of the entire converter station. Therefore, it is very important to give early warning to the abnormal overcurrent detection device in time.

In traditional technologies, there is a problem that the early warning strategy for the valve control system is not comprehensive enough, especially in the field of new ultra-high voltage energy storage, where the reliability requirements for the valve control system are more stringent.

Summary of the invention

In view of the above problems, the present application provides an overcurrent detection device, a protection device and an abnormality warning method, which can enhance the ability to warn of abnormalities in the overcurrent detection device and make the warning strategy in the energy storage valve control system more perfect.

In a first aspect, the present application provides an overcurrent detection device, which operates in parallel with N-1 other overcurrent detection devices in an N-to-M redundant structure of an energy storage valve control system, where N is an integer greater than or equal to 3 and M is an integer less than N. The overcurrent detection device is communicatively connected to the N-1 other overcurrent detection devices respectively, and the overcurrent detection device includes: a sampling unit, which is configured to sample the first measuring unit to obtain a first current value; a transceiver unit, which is configured to receive from the N-1 other overcurrent detection devices the second current value to the N-th current value obtained by each overcurrent detection device sampling the corresponding measuring unit; a difference calculation unit, which is configured to calculate the first current difference value to the N-1th current difference value, the first current difference value to the N-1th current difference value representing the current difference between the first current value and the second current value to the N-1th current value respectively; and an early warning output unit, which is configured to output a first early warning signal when the first current difference value to the N-1th current difference value are respectively greater than the first difference threshold value to the N-1th difference threshold value corresponding to the first current difference value to the N-1th current difference value, and the first early warning signal indicates that the overcurrent detection device is abnormal.

In the technical solution of the embodiment of the present application, the overcurrent detection device receives the current values of the other N-1 overcurrent detection devices respectively through the transceiver unit, calculates the current difference between the overcurrent detection device and the other N-1 overcurrent detection devices through the difference calculation unit, and outputs the first warning signal through the warning output unit when the N-1 current differences all exceed the corresponding difference threshold value. Therefore, when the current of the overcurrent detection device has a large deviation relative to the current of the other N-1 overcurrent detection devices running in parallel, the user can be notified of the abnormality of the overcurrent detection device, thereby realizing early warning of the abnormality of the overcurrent detection device. Accordingly, the ability to warn of the abnormality of the overcurrent detection device is enhanced, making the warning strategy in the energy storage valve control system more perfect, and thus improving the reliability and safety of the valve control system.

In some embodiments, the difference calculation unit is configured to respectively calculate the current differences between the Kth current value from the second current value to the Nth current value and the remaining current values from the second current value to the Nth current value. The warning output unit is also configured to: when the K-1th current difference from the first current difference to the N-1th current difference is greater than the K-1th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold value, and the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value are respectively greater than the corresponding difference threshold value, output a second warning signal, the second warning signal indicating that the overcurrent detection device that samples the Kth current value is abnormal.

When the current difference between this overcurrent detection device and only one other overcurrent detection device is greater than the corresponding difference threshold value, the early warning output unit implements abnormal early warning for the other N-1 overcurrent detection devices based on the comparison between the current difference between the other N-1 overcurrent detection devices and the corresponding difference threshold value.

In some embodiments, the overcurrent detection device also includes: a storage unit, which is configured to store a plurality of first current values to Nth current values in association with a sampling sequence number within a predetermined time period including a plurality of time sections; a difference threshold value calculation unit, which is configured to calculate the first difference threshold value to the N-1th difference threshold value based on the stored plurality of first current values to Nth current values when each current value among the stored plurality of first current values to Nth current values is within a preset current range, and calculate each difference threshold value of the Kth current value relative to the remaining current values among the second current value to the Nth current value.

By dynamically calculating and updating the difference threshold value in real time through the difference threshold value calculation unit, the overcurrent detection device having abnormal sampling values relative to other overcurrent detection devices can be found more accurately.

In some embodiments, the difference calculation unit is configured to: calculate the first current difference to the N-1th current difference between the stored first current value and the stored second current value to the Nth current value according to the corresponding sampling sequence number at each time section within the predetermined time period, and calculate the current differences between the Kth current value from the stored second current value to the Nth current value and the remaining current values from the second current value to the Nth current value. The difference threshold value calculation unit is configured to: calculate the first difference threshold value to the N-1th difference threshold value based on the first current difference to the N-1th current difference at each time section; and calculate the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value based on the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at each time section.

The difference calculation unit calculates the current difference from the first current difference to the N-1th current difference at multiple time sections, as well as the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at multiple time sections, so that the difference threshold value calculation unit can correspondingly obtain more reliable and accurate first difference threshold value to the N-1th difference threshold value, as well as the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value.

In some embodiments, the difference calculation unit is configured to calculate the average value of each of the multiple first current difference values to the multiple N-1th current difference values under the multiple time sections to obtain the first difference typical value to the N-1th difference typical value; respectively calculate the average values of the current difference values of the Kth current value and the remaining current values from the second current value to the Nth current value under the multiple time sections in a one-to-one correspondence to obtain the difference typical values of the Kth current value relative to the remaining current values from the second current value to the Nth current value. The difference threshold value calculation unit is configured to: respectively calculate the product of the first difference typical value to the N-1th difference typical value and the preset threshold coefficient to obtain the first difference threshold value to the N-1th difference threshold value; and respectively calculate the product of the difference typical values of the Kth current value relative to the remaining current values from the second current value to the Nth current value and the preset threshold coefficient to obtain the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value.

The difference calculation unit is used to calculate the average value of each of the multiple first current differences to the multiple N-1th current differences under multiple time sections, and the first difference typical value to the N-1th difference typical value are obtained. Then, the difference threshold value calculation unit is used to assist each difference typical value with a preset threshold coefficient, thereby improving the accuracy of the difference threshold value and making the horizontal data comparison result more accurate.

In the second aspect, the present application provides an abnormal warning method. The method is applied to an N-out-of-M redundant structure in an energy storage valve control system, wherein N is an integer greater than or equal to 3, and M is an integer less than N. The N-out-of-M redundant structure includes a first overcurrent detection device to an N-th overcurrent detection device operating in parallel, and a protection device, wherein the first overcurrent detection device to the N-th overcurrent detection device are suitable for sampling the first measurement unit to the N-th measurement unit to obtain the first current value to the N-th current value, and the protection device is suitable for performing N-out-of-M voting on the overcurrent detection results output by the first overcurrent detection device to the N-th overcurrent detection device and outputting the N-out-of-M voting result, wherein any overcurrent detection device from the first overcurrent detection device to the N-th overcurrent detection device is communicatively connected to N-1 other overcurrent detection devices, respectively, The method is executed by any overcurrent detection device from the first overcurrent detection device to the Nth overcurrent detection device. When the method is executed by the first overcurrent detection device, the method includes: receiving the second current value to the Nth current value from the second overcurrent detection device to the Nth overcurrent detection device, respectively; calculating the first current difference to the N-1th current difference, the first current difference to the N-1th current difference representing the current difference between the first current value and the second current value to the Nth current value, respectively; and when the first current difference to the N-1th current difference are respectively greater than the first difference threshold value to the N-1th difference threshold value corresponding to the first current difference to the N-1th current difference, outputting a first warning signal, the first warning signal indicating that the first overcurrent detection device is abnormal.

In the technical solution of the embodiment of the present application, any overcurrent detection device is used as the main device, and the current values of the other N-1 overcurrent detection devices are received horizontally through the main device, and then the current difference between the main device and the other N-1 overcurrent detection devices is obtained respectively, and the N-1 current difference is compared with the corresponding difference threshold value respectively. When the N-1 current difference exceeds the corresponding difference threshold value, the overcurrent detection device as the main device is given an abnormal warning. Therefore, the horizontal warning is realized by comparing the current data between the overcurrent detection devices, which improves the reliability and safety of the valve control system.

In some embodiments, the method also includes: respectively calculating the current differences between the Kth current value from the second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and when the K-1th current difference from the first current difference to the N-1th current difference is greater than the K-1th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold value, and the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value are respectively greater than the corresponding difference threshold values, outputting a second warning signal, and the second warning signal indicates that the Kth overcurrent detection device is abnormal.

In the embodiment of the present application, when the current difference between any overcurrent detection device and only one other overcurrent detection device is greater than the corresponding difference threshold value, the current difference between the other N-1 overcurrent detection devices is compared with the corresponding difference threshold value, thereby achieving abnormal warning for the other N-1 overcurrent detection devices.

In some embodiments, the method also includes: storing a plurality of first to Nth current values in association with a sampling sequence number within a predetermined time period including a plurality of time sections; and when each current value among the plurality of first to Nth current values stored is within a preset current range, calculating the first difference threshold value to the N-1th difference threshold value based on the plurality of first to Nth current values stored, and calculating each difference threshold value of the Kth current value relative to the remaining current values among the second current value to the Nth current value.

Compared with using a pre-set value or a value manually set based on historical data as the difference threshold value between overcurrent detection devices, the embodiment of the present application can more accurately find the overcurrent detection device with abnormal sampling values relative to other overcurrent detection devices by dynamically calculating and updating the difference threshold value in real time.

In some embodiments, the calculation of the first difference threshold value to the N-1th difference threshold value, and the calculation of each difference threshold value of the Kth current value relative to the remaining current values from the second current value to the Nth current value include: at each time section within the predetermined time period, according to the corresponding sampling sequence number, respectively calculating the first current difference to the N-1th current difference between the stored first current value and the stored second current value to the Nth current value, and respectively calculating each current difference between the Kth current value from the stored second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and respectively calculating the first difference threshold value to the N-1th difference threshold value based on the first current difference to the N-1th current difference at each time section; and respectively calculating each difference threshold value of the Kth current value relative to the remaining current values from the second current value to the Nth current value based on the current difference between the Kth current value and the remaining current values from the second current value to the Nth current value at each time section.

In the embodiment of the present application, by accumulating the first current difference value to the N-1th current difference value at multiple time sections, more reliable first difference threshold value to the N-1th difference threshold value can be obtained accordingly.

In some embodiments, the first difference threshold value to the N-1th difference threshold value are calculated based on the first current difference value to the N-1th current difference value at each time section respectively; and the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value are calculated based on the current differences of the Kth current value at each time section and the remaining current values from the second current value to the Nth current value respectively, including: calculating the average value of each of the multiple first current differences to the multiple N-1th current differences at the multiple time sections to obtain the first difference typical value to the N-1th difference typical value; calculating the first difference typical value to the N-1th difference typical value respectively. The typical value of the difference is multiplied by the preset threshold coefficient to obtain the first difference threshold value to the N-1th difference threshold value; the average values of the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value under the multiple time sections are calculated one by one to obtain the typical values of the difference between the Kth current value and the remaining current values from the second current value to the Nth current value; and the product of the typical values of the difference between the Kth current value and the remaining current values from the second current value to the Nth current value and the preset threshold coefficient is calculated to obtain the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value.

In the embodiment of the present application, the average values of the first current difference value to each of the multiple N-1th current difference values under multiple time sections are calculated respectively to obtain the first difference typical value to the N-1th difference typical value. By supplementing each difference typical value with a preset threshold coefficient, a more accurate difference threshold value can be obtained, thereby improving the reliability of each difference threshold value.

In a third aspect, the present application provides a protection device, which is located in an N-out-of-M redundant structure of an energy storage valve control system, wherein N is an integer greater than or equal to 3, and M is an integer less than N. The protection device is suitable for performing N-out-of-M voting on the overcurrent detection results output by the first overcurrent detection device to the N-th overcurrent detection device running in parallel and outputting the N-out-of-M voting results. The protection device includes: a receiving unit, which is configured to receive the first current value to the N-th current value from the first overcurrent detection device to the N-th overcurrent detection device respectively; a difference calculation unit, which is configured to calculate the first current difference to the N-1th current difference, the first current difference to the N-1th current difference representing the current difference between the first current value and the second current value to the N-1th current value respectively; and an early warning output unit, which is configured to output a first early warning signal when the first current difference to the N-1th current difference are respectively greater than the first difference threshold value to the N-1th difference threshold value corresponding to the first current difference to the N-1th current difference, and the first early warning signal indicates that the first overcurrent detection device is abnormal.

In the technical solution of the embodiment of the present application, the first current value to the Nth current value of the first overcurrent detection device to the Nth overcurrent detection device are respectively received by the receiving unit, and then the first current difference to the N-1th current difference between the first current value and the other N-1 current values are respectively obtained by the difference calculation unit based on the first current value, so that the first current difference to the N-1th current difference are respectively compared with the corresponding difference threshold value through the early warning output unit, and when these N-1 current differences all exceed the corresponding difference threshold value, an abnormal early warning of the first overcurrent detection device corresponding to the first current value is realized.

In some embodiments, the difference calculation unit is configured to respectively calculate the current differences between the Kth current value from the second current value to the Nth current value and the remaining current values from the second current value to the Nth current value. The warning output unit is configured to: when the K-1th current difference from the first current difference to the N-1th current difference is greater than the K-1th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold value, and the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value are greater than the corresponding difference threshold value, output a second warning signal, and the second warning signal indicates that the Kth overcurrent detection device is abnormal.

When only one of the first current difference to the N-1th current difference is greater than the difference threshold value, for example, when only the K-1th current difference is greater than the K-1th difference threshold value, the early warning output unit compares the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value with the corresponding difference threshold values, thereby realizing abnormal early warning of the second to the Nth overcurrent detection devices.

In some embodiments, the protection device also includes: a storage unit, which is configured to store a plurality of first current values to Nth current values in association with a sampling sequence number within a predetermined time period including a plurality of time sections; and a difference threshold value calculation unit, which is configured to calculate the first difference threshold value to the N-1th difference threshold value based on the stored plurality of first current values to Nth current values when each current value among the stored plurality of first current values to Nth current values is within a preset current range, and calculate each difference threshold value of the Kth current value relative to the remaining current values among the second current value to the Nth current value.

In some embodiments, the difference calculation unit is configured to calculate the first current difference to the N-1th current difference between the stored first current value and the stored second current value to the Nth current value according to the corresponding sampling sequence number at each time section within the predetermined time period, and to calculate the current differences between the Kth current value from the stored second current value to the Nth current value and the remaining current values from the second current value to the Nth current value. The difference threshold value calculation unit is configured to: calculate the first difference threshold value to the N-1th difference threshold value based on the first current difference to the N-1th current difference at each time section; and calculate the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value based on the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at each time section.

In some embodiments, the difference calculation unit is configured to: calculate the average value of each of the multiple first current difference values to the multiple N-1th current difference values under the multiple time sections to obtain the first difference typical value to the N-1th difference typical value; respectively calculate the average values of the current difference values of the Kth current value and the remaining current values from the second current value to the Nth current value under the multiple time sections in a one-to-one correspondence to obtain the difference typical values of the Kth current value relative to the remaining current values from the second current value to the Nth current value. The difference threshold value calculation unit is configured to: respectively calculate the product of the first difference typical value to the N-1th difference typical value and the preset threshold coefficient to obtain the first difference threshold value to the N-1th difference threshold value; and respectively calculate the product of the difference typical values of the Kth current value relative to the remaining current values from the second current value to the Nth current value and the preset threshold coefficient to obtain the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value.

In the fourth aspect, the present application provides another abnormal warning method. The method is applied to the N-out-of-M redundant structure in the energy storage valve control system, wherein N is an integer greater than or equal to 3, and M is an integer less than N. The N-out-of-M redundant structure includes a first overcurrent detection device to an N-th overcurrent detection device operating in parallel, and a protection device, wherein the first overcurrent detection device to the N-th overcurrent detection device are suitable for sampling the first measurement unit to the N-th measurement unit to obtain the first current value to the N-th current value, and the protection device is suitable for performing N-out-of-M voting on the overcurrent detection results output by the first overcurrent detection device to the N-th overcurrent detection device and outputting the N-out-of-M voting result, wherein the method is performed by the protection device, and the method includes: receiving the first current value to the N-th current value from the first overcurrent detection device to the N-th overcurrent detection device respectively; calculating the first current difference to the N-1th current difference, wherein the first current difference to the N-1th current difference represent the current difference between the first current value and the second current value to the N-1th current value respectively; and when When the first current difference to the N-1th current difference are respectively greater than the first difference threshold to the N-1th difference threshold corresponding to the first current difference to the N-1th current difference, a first warning signal is output, and the first warning signal indicates that the first overcurrent detection device is abnormal.

In the technical solution of the embodiment of the present application, the protection device is used as the executor, and the first current value to the Nth current value of the first overcurrent detection device to the Nth overcurrent detection device are received respectively. Based on the first current value, the first current difference to the N-1th current difference of the first current value and the other N-1 current values are obtained respectively, and the first current difference to the N-1th current difference are compared with the corresponding difference threshold values respectively. When these N-1 current differences all exceed the corresponding difference threshold values, the first overcurrent detection device corresponding to the first current value is given an abnormal warning. Similarly, horizontal warning is achieved by comparing the current data between the overcurrent detection devices.

In some embodiments, the method also includes: respectively calculating the current differences between the Kth current value from the second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and when the K-1th current difference from the first current difference to the N-1th current difference is greater than the K-1th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold value, and the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value are greater than the corresponding difference threshold value, outputting a second warning signal, the second warning signal indicating that the Kth overcurrent detection device is abnormal.

In the embodiment of the present application, when the protection device is used as the execution body, abnormal warning of the second overcurrent detection device to the Nth overcurrent detection device can also be achieved.

In some embodiments, the calculation of the first difference threshold value to the N-1th difference threshold value, and the calculation of each difference threshold value of the Kth current value relative to the remaining current values from the second current value to the Nth current value, include: at each time section within the predetermined time period, respectively calculating the first current difference to the N-1th current difference between the stored first current value and the stored second current value to the Nth current value according to the corresponding sampling sequence number, and respectively calculating each current difference between the Kth current value among the stored second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and respectively calculating the first difference threshold value to the N-1th difference threshold value based on the first current difference to the N-1th current difference at each time section; and respectively calculating each difference threshold value of the Kth current value relative to the remaining current values from the second current value to the Nth current value based on the current difference between the Kth current value and the remaining current values from the second current value to the Nth current value at each time section.

In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the method described in the second aspect or the fourth aspect are implemented.

The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a part of an energy storage valve control system in conventional technology;

FIG2 is a diagram of an application environment of an overcurrent detection device according to some embodiments of the present application;

FIG3 is a schematic structural diagram of an overcurrent detection device according to some embodiments of the present application;

FIG4 is a schematic diagram of a specific structure of an overcurrent detection device according to some embodiments of the present application;

FIG5 is a diagram of an application environment of an overcurrent detection device according to other embodiments of the present application;

FIG6 is a schematic structural diagram of an overcurrent detection device according to other embodiments of the present application;

FIG7 is a schematic diagram of a specific structure of an overcurrent detection device according to other embodiments of the present application;

FIG8 is a schematic flow chart of an abnormality warning method performed by an overcurrent detection device according to some embodiments of the present application;

FIG9 is a schematic diagram of a specific process of an abnormal warning method performed by an overcurrent detection device according to some embodiments of the present application;

FIG10 is a schematic flow chart of an abnormality warning method performed by an overcurrent detection device according to other embodiments of the present application;

FIG11 is a schematic diagram of a specific flow chart of an abnormality warning method performed by an overcurrent detection device according to other embodiments of the present application;

FIG12 is a schematic diagram of the correspondence between sampling sequence number differences and sampling data of an overcurrent detection device according to some embodiments of the present application;

FIG13 is a diagram of an application environment of a protection device according to some embodiments of the present application;

FIG14 is a schematic structural diagram of a protection device according to some embodiments of the present application;

FIG15 is a schematic diagram of a specific structure of a protection device according to some embodiments of the present application;

FIG16 is a diagram of an application environment of a two-out-of-three protection device according to other embodiments of the present application;

FIG17 is a schematic structural diagram of a two-out-of-three protection device according to other embodiments of the present application;

FIG18 is a schematic diagram of a specific structure of a two-out-of-three protection device according to other embodiments of the present application;

FIG19 is a flow chart of an abnormality warning method performed by a protection device according to some embodiments of the present application; and

FIG20 is a flow chart of an abnormal warning method performed by a two-out-of-three protection device according to other embodiments of the present application.

Detailed ways

The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

Reference to "embodiments" herein means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least some embodiments of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.

In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

The accuracy of the overcurrent detection results of the energy storage valve control system is related to whether the converter valve can operate stably. In daily operation, the overcurrent detection device in the energy storage valve control system may have problems such as communication interruption, program runaway, abnormal crash, etc., which will affect the overcurrent detection results of the converter valve. At present, overcurrent detection devices and three-out-of-two protection devices are used to perform protection actions, sample value judgments and early warnings. However, this processing method is based on the vertical isolated judgment in the direction of the data flow, and only considers the comparison between the protection setting value and the real-time analog quantity of a single overcurrent detection device. The early warning strategy is not comprehensive enough. By increasing the horizontal data comparison between the overcurrent detection devices, the inventor can also warn the abnormally operating overcurrent detection device, making the early warning strategy in the energy storage valve control system more perfect.

At present, the new energy storage valve control system has put forward normative requirements in accordance with the "Zhangbei ±35kV DC Energy Storage Project Flexible Direct Current Energy Storage Device Technical Specifications": Valve-controlled overcurrent protection and valve-controlled unbalance protection are designed according to the "three-out-of-two" design, as shown in Figure 1, including the first valve protection unit 100, the second valve protection unit 110, the third valve protection unit 120, the first protection three-out-of-two unit 130, the second protection three-out-of-two unit 140, the first valve control unit 150 and the second valve control unit 160. The three valve protection units are independently configured in hardware. The first valve protection unit 100 is used to sample the first measurement unit 170 to obtain sampling data, the second valve protection unit 110 is used to sample the second measurement unit 180 to obtain sampling data, and the third valve protection unit 120 is used to sample the third measurement unit 190 to obtain sampling data. After each valve protection unit judges the sampling data, the processed data is sent to the corresponding protection three-out-of-two unit for logical judgment. The two protection three-out-of-two units are independent of each other and send the processed data to the corresponding valve control unit for unified processing of the valve control system. It should be noted that in the context, the valve protection unit and the overcurrent detection device both refer to the same product, which is uniformly referred to as the valve protection unit or the overcurrent detection device. Similarly, the three-out-of-two protection unit and the three-out-of-two protection device both refer to the same product, which is uniformly referred to as the three-out-of-two protection unit or the three-out-of-two protection device.

In traditional technology, the early warning for the new energy storage valve control system is considered longitudinally, and only the comparison between the protection setting value and the real-time analog value of a single overcurrent detection device is considered. The comparison between the data of the overcurrent detection devices is not considered. Therefore, the early warning strategy for the valve control system is not comprehensive enough. Especially for the new energy storage ultra-high voltage field, the reliability requirements for the valve control system are extremely strict. The inventors have found that adding lateral warnings can enhance the ability of real-time warning of instantaneous values, enhance the ability of multi-directional monitoring of bridge arm current, and enhance the system's panoramic fault monitoring and early warning capabilities, which is of great significance to improving the reliability and safety of the valve control system.

Therefore, this application proposes a technical solution for horizontal comparison of the sampling data of multiple flow detection devices running in parallel in the energy storage valve control system. This technical solution is used in the valve control system in the engineering integration application of AC/DC microgrid/distribution network technology and battery energy storage technology. It uses the horizontal data acquisition of the overcurrent detection device to compare the data at the same time section. When the difference between any two data is greater than the threshold, an early warning is issued.

There are two technical solutions for horizontal warning proposed in this application: one is that N overcurrent detection devices share data in a ring network, and any overcurrent detection device is used as the main device. The main device compares its own data with the data of other N-1 overcurrent detection devices to obtain data differences. When the differences exceed the corresponding thresholds, the main device issues a warning signal; the other is that the data of N overcurrent detection devices are sent to the protection device, and the protection device compares N data horizontally to obtain data differences. When the data difference is greater than the corresponding threshold, the protection device issues a warning signal. Please refer to Figure 2, which is an application environment diagram of the overcurrent detection device according to some embodiments of the present application. Figure 2 shows an N-out-of-M redundant structure 200 as part of the energy storage valve control system, where N represents the number of overcurrent detection devices, which is an integer greater than or equal to 3, and M is an integer less than N. The N-out-of-M redundant structure 200 includes N overcurrent detection devices and a protection device. The N overcurrent detection devices operate in parallel, including a first overcurrent detection device 210, a second overcurrent detection device 220, ..., and an Nth overcurrent detection device 230. The first overcurrent detection device 210 is adapted to sample the first measurement unit 250 to obtain a first current value, the second overcurrent detection device 220 is adapted to sample the second measurement unit 260 to obtain a second current value, ..., the Nth overcurrent detection device 230 is adapted to sample the Nth measurement unit 270 to obtain an Nth current value. The protection device 240 is adapted to perform N out of M voting on the overcurrent detection results output by the first overcurrent detection device 210 to the Nth overcurrent detection device 230 and output the N out of M voting result.

Compared with the mutually independent first valve protection unit 100, second valve protection unit 110, and third valve protection unit 120 shown in FIG1, in this embodiment, any overcurrent detection device from the first overcurrent detection device 210 to the Nth overcurrent detection device 230 is communicatively connected with the other N-1 overcurrent detection devices. For example, the first overcurrent detection device 210 to the Nth overcurrent detection device 230 can share data such as real-time sampling current value and sampling sequence number through the HSR (High-availability Seamless Redundancy) ring network protocol.

It can be understood that the first overcurrent detection device 210 to the Nth overcurrent detection device 230 are overcurrent detection devices having the same configuration and realizing the same function, and they are named differently only for the convenience of description. The structure of the overcurrent detection device according to the embodiment of the present application is described below by taking the first overcurrent detection device 210 as an example in combination with FIG. 3 .

As shown in FIG3 , the first overcurrent detection device 210 includes a sampling unit 310, a transceiver unit 320, a difference calculation unit 330, and an early warning output unit 340. The sampling unit 310 is configured to sample the first measurement unit 250 to obtain a first current value. In some examples, the current is an instantaneous value. The transceiver unit 320 is configured to receive the second current value to the Nth current value obtained by each overcurrent detection device sampling the corresponding measurement unit from another N-1 overcurrent detection devices, that is, to receive the second current value from the second overcurrent detection device 220, ..., and to receive the Nth current value from the Nth overcurrent detection device 230. The transceiver unit 320 is also configured to send the first current value to the second overcurrent detection device 220 to the Nth overcurrent detection device 230, respectively. The difference calculation unit 330 is configured to calculate the current difference between the first current value and the second current value to the Nth current value, that is, to calculate the current difference between the first current value and the second current value to obtain the first current difference, to calculate the current difference between the first current value and the third current value to obtain the second current difference, until the current difference between the first current value and the Nth current value is calculated to obtain the N-1th current difference. It should be noted that the first current difference to the N-1th current difference are all absolute values of the instantaneous current difference. The early warning output unit 340 is configured to output a first early warning signal indicating that the first overcurrent detection device 210 is abnormal when the first current difference to the N-1th current difference are respectively greater than the first difference threshold value to the N-1th difference threshold value corresponding to the first current difference to the N-1th current difference.

In this embodiment, the first overcurrent detection device 210 can be regarded as a main overcurrent detection device, and the second overcurrent detection device 220 to the Nth overcurrent detection device 230 can be regarded as slave overcurrent detection devices. The main overcurrent detection device receives the current values of the other N-1 slave overcurrent detection devices through the transceiver unit 320, calculates the current difference between the main overcurrent detection device and the N-1 slave overcurrent detection devices through the difference calculation unit 330, and realizes abnormal warning of the main overcurrent detection device through the warning output unit 340 when the calculated N-1 current differences all exceed the corresponding difference threshold value, thereby improving the reliability and safety of the valve control system.

In some embodiments, the difference calculation unit 330 is configured to respectively calculate the current differences between the Kth current value from the second current value to the Nth current value and the remaining current values from the second current value to the Nth current value. The warning output unit 340 is configured to output a second warning signal indicating that the Kth overcurrent detection device that samples the Kth current value is abnormal when only one current difference from the first current difference to the N-1th current difference is greater than the corresponding difference threshold value, for example, when only the K-1th current difference between the first current value and the Kth current value is greater than the K-1th difference threshold value, and the remaining N-2 current differences from the first current difference to the N-1th current difference are all less than or equal to the corresponding difference threshold value, and the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value are respectively greater than the corresponding difference threshold value.

The above-mentioned warning output unit 340 can not only realize abnormal warning for the first overcurrent detection device 210, but also realize abnormal warning for other N-1 overcurrent detection devices.

In some embodiments, the time sections can be arranged according to the sampling cycle within a predetermined time period. As shown in FIG4 , the first overcurrent detection device 210 may further include a storage unit 350 and a difference threshold value calculation unit 360. The storage unit 350 is configured to store the first current value to the Nth current value associated with the sampling sequence number at each time section. The difference threshold value calculation unit 360 is configured to enable the current rating when receiving the setting of the current rating of the energy storage valve control system. The setting of the current rating can be set manually. Further, the first current value to the Nth current value stored at each time section are compared with the preset current range. If each of the first current value to the Nth current value is within the preset current range, it is confirmed that the current first current value to the Nth current value can be used for the calculation of the difference threshold value. The preset current range is determined according to the set current rating. In some examples, taking _In as an example to represent the current rating, the preset current range can be (1±20%) _In . Furthermore, the difference threshold value calculation unit 360 calculates the first difference threshold value to the N-1th difference threshold value based on multiple first current values to the Nth current values under multiple time sections, and calculates each difference threshold value of the Kth current value relative to the remaining current values from the second current value to the Nth current value.

The storage unit 350 is further configured to store the first difference threshold value to the N-1th difference threshold value, and store the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value.

By dynamically calculating and updating the difference threshold value in real time through the difference threshold value calculation unit 360, the overcurrent detection device having abnormal sampling values relative to other overcurrent detection devices can be found more accurately.

In some embodiments, the difference calculation unit 330 performs a horizontal comparison of the sampling numbers under the same time section to obtain the sampling number differences between any two of the N overcurrent detection devices. Further, based on the corresponding sampling number differences, the first current difference between the first current value and the second current value, the second current difference between the first current value and the third current value, ..., the N-1th current difference between the first current value and the Nth current value, and the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value are calculated respectively. The same calculation is performed for other time sections.

The difference calculation unit 330 calculates the first current difference to the N-1th current difference at multiple time sections, so that the difference threshold calculation unit 360 can correspondingly obtain more reliable and accurate first difference threshold, second difference threshold and third difference threshold.

In some embodiments, the difference calculation unit 330 calculates the average value of each of the first current difference value to the N-1th current difference value at different time sections, and accordingly obtains the first difference typical value to the N-1th difference typical value; and calculates the average value of each current difference value between the Kth current value and the remaining current values from the second current value to the Nth current value at different time sections, and obtains each difference typical value of the Kth current value relative to the remaining current values from the second current value to the Nth current value. When calculating the difference typical value, the number of selected time sections can be set according to actual conditions. In some examples, the first current difference value to the N-1th current difference value at 10 time sections can be taken to participate in the calculation.

The difference threshold value calculation unit 360 obtains a preset threshold coefficient, and then multiplies each difference typical value by the preset threshold coefficient to determine the corresponding difference threshold value. Specifically, the preset threshold coefficient can be set manually according to actual needs, and its value is greater than 1. In some examples, the typical value of the threshold coefficient is 1.2.

In order to more specifically explain the technical solution of the overcurrent detection device of the present application, the technical solution of the present application is described in detail below by taking the N out of M redundant structure 200 in FIG. 2 as a three out of two redundant structure as an example. It can be understood that when the N out of M redundant structure is taken as a three out of two redundant structure as an example, the protection device will perform a three out of two logic for the overcurrent detection result.

Please refer to FIG. 5, which is an application environment diagram of an overcurrent detection device according to other embodiments of the present application. FIG. 5 shows a three-out-of-two redundant structure 500 as part of an energy storage valve control system. The three-out-of-two redundant structure 500 includes three overcurrent detection devices and a three-out-of-two protection device 540. The three overcurrent detection devices operate in parallel, including a first overcurrent detection device 510, a second overcurrent detection device 520, and a third overcurrent detection device 530. The first overcurrent detection device 510 is suitable for sampling the first measurement unit 550 to obtain a first current value, the second overcurrent detection device 520 is suitable for sampling the second measurement unit 560 to obtain a second current value, and the third overcurrent detection device 530 is suitable for sampling the third measurement unit 570 to obtain a third current value. The three-out-of-two protection device 540 is suitable for performing a three-out-of-two vote on the overcurrent detection results output by the first overcurrent detection device 510, the second overcurrent detection device 520, and the third overcurrent detection device 530 and outputting the three-out-of-two voting result.

In this embodiment, any one of the first overcurrent detection device 510, the second overcurrent detection device 520 and the third overcurrent detection device 530 is communicatively connected to the other two overcurrent detection devices. For example, the first overcurrent detection device 510, the second overcurrent detection device 520 and the third overcurrent detection device 530 can share data such as real-time sampling current value and sampling sequence number through the HSR ring network protocol.

The structure of the overcurrent detection device according to the embodiment of the present application is described below by taking the first overcurrent detection device 510 as an example in combination with FIG. 6 .

As shown in FIG6 , the first overcurrent detection device 510 includes a sampling unit 610, a transceiver unit 620, a difference calculation unit 630, an early warning output unit 640 and a storage unit 650. The sampling unit 610 is configured to sample the first measurement unit 550 to obtain a first current value. In some examples, the current is an instantaneous value. The transceiver unit 620 is configured to receive a second current value from the second overcurrent detection device 520 and to receive a third current value from the third overcurrent detection device 530. The transceiver unit 620 is also configured to send the first current value to the second overcurrent detection device 520 and the third overcurrent detection device 530. The difference calculation unit 630 is configured to calculate a first current difference between the first current value and the second current value, and a second current difference between the first current value and the third current value. The first current difference may be the absolute value of the current difference between the first current value and the second current value, and the second current difference may be the absolute value of the current difference between the first current value and the third current value. The warning output unit 640 is configured to output a first warning signal indicating that the first overcurrent detection device is abnormal when the first current difference is greater than the first difference threshold value and the second current difference is greater than the second difference threshold value. The storage unit 650 is configured to store the first current value, the second current value and the third current value.

In this embodiment, the first overcurrent detection device 510 can be regarded as a main overcurrent detection device, and the second overcurrent detection device 520 and the third overcurrent detection device 530 can be regarded as slave overcurrent detection devices. The main overcurrent detection device receives the current values of the two slave overcurrent detection devices respectively through the transceiver unit 620, calculates the current difference between the main overcurrent detection device and the two slave overcurrent detection devices through the difference calculation unit 630, and realizes abnormal warning of the main overcurrent detection device through the warning output unit 640 when the calculated two current differences exceed the corresponding difference threshold value, thereby improving the reliability and safety of the valve control system.

In some embodiments, the difference calculation unit 630 is configured to calculate the absolute value of the current difference between the second current value and the third current value to obtain the third current difference. The warning output unit 640 is configured to output a second warning signal indicating that the second overcurrent detection device 520 is abnormal, or output a third warning signal indicating that the third overcurrent detection device 530 is abnormal, according to the comparison relationship between the third current difference and the third difference threshold value when only one of the first current difference and the second current difference is greater than the difference threshold.

The above-mentioned warning output unit 640 can not only realize abnormal warning for the first overcurrent detection device, but also realize abnormal warning for the other two overcurrent detection devices.

In some embodiments, the time sections may be arranged according to the sampling period within a predetermined time period. The storage unit 650 is configured to store the first current value, the second current value and the third current value associated with the sampling sequence number in each time section.

As shown in FIG7 , the first overcurrent detection device 510 may further include a difference threshold value calculation unit 660, which enables the current rating when receiving the setting of the current rating of the energy storage valve control system. Further, the first current value, the second current value, and the third current value stored in each time section are compared with the preset current range. If the first current value, the second current value, and the third current value are all within the preset current range, it is confirmed that the current first current value, the second current value, and the third current value can be used for the calculation of the difference threshold value. Further, the difference threshold value calculation unit 660 calculates the first difference threshold value, the second difference threshold value, and the third difference threshold value based on multiple first current values, multiple second current values, and multiple third current values in multiple time sections.

The storage unit 650 is further configured to store a first difference threshold value, a second difference threshold value and a third difference threshold value.

By dynamically calculating and updating the difference threshold value in real time through the difference threshold value calculation unit 660, the over-current detection device having abnormal sampling values relative to other over-current detection devices can be found more accurately.

In some embodiments, the difference calculation unit 630 performs a horizontal comparison of the sampling numbers under the same time section to obtain the sampling number differences between any two of the three overcurrent detection devices. Further, based on the corresponding sampling number differences, the first current difference between the first current value and the second current value, the second current difference between the first current value and the third current value, and the third current difference between the second current value and the third current value are calculated respectively, and the same calculation is performed for other time sections.

The difference threshold value calculation unit 660 calculates a first difference threshold value, a second difference threshold value, and a third difference threshold value based on the first current difference value, the second current difference value, and the third current difference value in each time section, respectively.

The difference calculation unit 630 calculates the first current difference, the second current difference and the third current difference at multiple time sections, so that the difference threshold calculation unit 360 can correspondingly obtain more reliable and accurate first difference threshold, second difference threshold and third difference threshold.

In some embodiments, the difference calculation unit 630 calculates the average value of the first current difference, the second current difference, and the third current difference at different time sections, respectively, and obtains the first difference typical value, the second difference typical value, and the third difference typical value accordingly. When calculating the difference typical value, the number of selected time sections can be set according to actual conditions. In some examples, the first current difference, the second current difference, and the third current difference at 10 time sections can be taken to participate in the calculation respectively.

The difference threshold value calculation unit 660 determines a first difference threshold value, a second difference threshold value, and a third difference threshold value based on the first difference typical value, the second difference typical value, and the third difference typical value.

In some embodiments, the difference threshold value calculation unit 660 obtains a preset threshold coefficient and then multiplies each difference typical value by the preset threshold coefficient to determine the corresponding difference threshold value.

In some embodiments, as shown in FIG. 8 , an abnormality warning method is provided. This embodiment uses the method applied to the N out of M redundant structure 200 in the energy storage valve control system shown in FIG. 2 as an example for illustration.

The method is performed by any overcurrent detection device among the first overcurrent detection device 210, the second overcurrent detection device 220 to the Nth overcurrent detection device 230. When the method is performed by the first overcurrent detection device 210, the method includes:

In step S110 , the second current value to the Nth current value are received from the second over-current detection device 220 to the Nth over-current detection device 230 , respectively.

In step S120 , a first current difference value to an N−1th current difference value are calculated, where the first current difference value to an N−1th current difference value represent current differences between the first current value and the second current value to an Nth current value.

Specifically, the first current difference is the difference between the first current value and the second current value, the second current difference is the difference between the first current value and the third current value, and so on, and the N-1th current difference is the difference between the first current value and the Nth current value.

Step S130, when the first current difference to the N-1th current difference are respectively greater than the first difference threshold to the N-1th difference threshold corresponding to the first current difference to the N-1th current difference, a first warning signal is output, and the first warning signal indicates that the first overcurrent detection device 210 is abnormal.

Specifically, the first current difference and the first difference threshold value, the second current difference and the second difference threshold value, ..., the N-1th current difference and the N-1th difference threshold value are compared respectively. When each of the first current difference to the N-1th current difference is greater than the corresponding difference threshold value, it is determined that the first overcurrent detection device 210 is abnormal, and a first warning signal is output and sent to the monitoring background to realize real-time warning.

In this embodiment, any overcurrent detection device is used as the main device, and the current values of the other N-1 overcurrent detection devices are received horizontally through the main device, and then the current difference between the main device and the other N-1 overcurrent detection devices is obtained respectively, and the N-1 current differences are compared with the corresponding difference threshold values respectively. When the N-1 current differences exceed the corresponding difference threshold values, an abnormal warning is issued to the overcurrent detection device as the main device. Therefore, a horizontal warning is achieved by comparing the sampled data between the overcurrent detection devices, which improves the reliability and safety of the valve control system.

In some embodiments, as shown in FIG9 , the method further includes:

In step S140 , current differences between a Kth current value from the second current value to the Nth current value and the remaining current values from the second current value to the Nth current value are calculated respectively.

Specifically, the current difference between the Kth current value and the second current value, the current difference between the Kth current value and the third current value, and so on are calculated respectively until the current difference between the Kth current value and the Nth current value is calculated.

Step S150, when the K-1th current difference among the first current difference to the N-1th current difference is greater than the K-1th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold values, and the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value are respectively greater than the corresponding difference threshold values, a second warning signal is output, and the second warning signal indicates that the Kth overcurrent detection device is abnormal.

Specifically, when the K-1th current difference between the first current value and the Kth current value is greater than the K-1th difference threshold value, and the remaining N-2 current differences from the first current difference to the N-1th current difference are less than or equal to the corresponding difference threshold value, and each current difference between the Kth current value and the remaining current values from the second current value to the Nth current value is respectively greater than the corresponding difference threshold value, a second warning signal indicating an abnormality of the Kth overcurrent detection device is output.

In this embodiment, when the current difference between any overcurrent detection device and only one other overcurrent detection device is greater than the corresponding difference threshold value, the current difference between the other N-1 overcurrent detection devices is compared with the corresponding difference threshold value, thereby achieving abnormal warning for the other N-1 overcurrent detection devices.

In some embodiments, time sections can be arranged according to the sampling cycle within a predetermined time period, and the first current value to the Nth current value associated with the sampling sequence number can be stored in each time section. Furthermore, multiple first current values to the Nth current values in multiple time sections can be stored.

When the first overcurrent detection device 210 receives the setting of the current rating of the energy storage valve control system, the current rating is enabled. Further, the first current value to the Nth current value stored in each time section are compared with the preset current range. If each of the first current value to the Nth current value is within the preset current range, it is confirmed that the current first current value to the Nth current value can be used for the calculation of the difference threshold value.

In some embodiments, the steps of calculating the first difference threshold value to the N-1th difference threshold value, and calculating the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value include: performing a horizontal comparison of the sampling numbers under the same time section to obtain the sampling number differences between any two of the N overcurrent detection devices, and further, according to the corresponding sampling number differences, respectively calculating the first current difference to the N-1th current difference between the first current value and the second current value to the Nth current value, and calculating the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value, and the same calculation is performed under other time sections.

Furthermore, based on the first current difference to the N-1th current difference at different time sections, the first difference threshold value to the N-1th difference threshold value are calculated; and based on the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at different time sections, the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value are calculated.

In some embodiments, the steps of processing the first current difference value to the N-1th current difference value at each time section respectively to obtain the first difference threshold value to the N-1th difference threshold value include: respectively calculating the average value of each of the multiple first current difference values to the multiple N-1th current difference values at multiple time sections, and correspondingly obtaining the first difference typical value to the N-1th difference typical value, and further, multiplying each of the first difference typical value to the N-1th difference typical value by a preset threshold coefficient to obtain the first difference threshold value to the N-1th difference threshold value.

The step of calculating the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value based on the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at each time section includes: calculating the corresponding average values of the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at multiple time sections, and obtaining the typical values of the differences between the Kth current value and the remaining current values from the second current value to the Nth current value; further, multiplying the typical values of the differences between the Kth current value and the remaining current values from the second current value to the Nth current value by a preset threshold coefficient, so as to obtain the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value.

In other embodiments, as shown in FIG. 10 , an abnormality warning method is provided. This embodiment takes the method applied to the two-out-of-three redundant structure 500 in the energy storage valve control system shown in FIG. 5 as an example for illustration.

The method is performed by any one of the first overcurrent detection device 510, the second overcurrent detection device 520 and the third overcurrent detection device 530. When the method is performed by the first overcurrent detection device 510, the method includes:

Step S210 , receiving a second current value and a third current value from the second over-current detection device 520 and the third over-current detection device 530 , respectively.

Specifically, the first overcurrent detection device 510 can receive in real time the second current value sent by the second overcurrent detection device 520 and the third current value sent by the third overcurrent detection device 530 at the same time section. In some examples, the first current value, the second current value, and the third current value are all instantaneous current values.

Step S220, calculating a first current difference between the first current value and the second current value; calculating a second current difference between the first current value and the third current value;

Specifically, the first current difference is the absolute value of the instantaneous current difference between the first overcurrent detection device 510 and the second overcurrent detection device 520 , and the second current difference is the absolute value of the instantaneous current difference between the first overcurrent detection device 510 and the third overcurrent detection device 530 .

Step S230, when the first current difference is greater than the first difference threshold value, and the second current difference is greater than the second difference threshold value, a first warning signal is output, and the first warning signal indicates that the first overcurrent detection device 510 is abnormal.

Specifically, the first difference threshold value is a current difference threshold value between the first overcurrent detection device 510 and the second overcurrent detection device 520, and the second difference threshold value is a current difference threshold value between the first overcurrent detection device 510 and the third overcurrent detection device 530. The first current difference between the first overcurrent detection device 510 and the second overcurrent detection device 520 is compared with the corresponding first difference threshold value, and the second current difference between the first overcurrent detection device 510 and the third overcurrent detection device 530 is compared with the corresponding second difference threshold value. According to the comparison result, an abnormal overcurrent detection device can be detected.

When the first current difference is greater than the first difference threshold value, and the second current difference is greater than the second difference threshold value, it is determined that the first overcurrent detection device 510 is abnormal, outputs a first warning signal, and sends it to the monitoring background to achieve real-time warning.

In this embodiment, any overcurrent detection device is used as the main device, and the current values of the other two overcurrent detection devices are received horizontally through the main device, and then the current difference between the main device and the other two overcurrent detection devices is obtained respectively, and the two current differences are compared with the corresponding difference threshold values respectively. When the two current differences exceed the corresponding difference threshold values, an abnormal warning is issued to the overcurrent detection device as the main device. Thus, a horizontal warning is achieved by comparing the sampled data between the overcurrent detection devices, which improves the reliability and safety of the valve control system.

In some embodiments, as shown in FIG11 , the method further includes:

Step S240, calculating a third current difference between the second current value and the third current value.

Specifically, the third current difference is an absolute value of an instantaneous current difference between the second overcurrent detection device 520 and the third overcurrent detection device 530 .

Step S250, when the first current difference is greater than the first difference threshold value, the second current difference is less than or equal to the second difference threshold value, and the third current difference is greater than the third difference threshold value, a second warning signal is output, and the second warning signal indicates that the second overcurrent detection device 520 is abnormal;

Specifically, the third difference threshold value is a current difference threshold value between the second overcurrent detection device 520 and the third overcurrent detection device 530. When the first current difference value is greater than the first difference threshold value, and the second current difference value is less than or equal to the second difference threshold value, further, the third current difference value between the second overcurrent detection device 520 and the third overcurrent detection device 530 is compared with the corresponding third difference threshold value, and when the third current difference value is greater than the third difference threshold value, it is determined that the second overcurrent detection device 520 is abnormal, and a second warning signal is output, which indicates that the second overcurrent detection device 520 is abnormal.

Step S260, when the first current difference is less than or equal to the first difference threshold, the second current difference is greater than the second difference threshold, and the third current difference is greater than the third difference threshold, a third warning signal is output, and the third warning signal indicates that the third overcurrent detection device 530 is abnormal.

Specifically, when the first current difference is less than or equal to the first difference threshold value and the second current difference is greater than the second difference threshold value, the third current difference between the third overcurrent detection device 530 and the second overcurrent detection device 520 is further compared with the corresponding third difference threshold value. When the third current difference is greater than the third difference threshold value, it is determined that the third overcurrent detection device 530 is abnormal, and a third warning signal is output, which indicates that the third overcurrent detection device 530 is abnormal.

By comparing the current difference between any overcurrent detection device and only one other overcurrent detection device when the current difference is greater than the corresponding difference threshold value, the current difference between the other two overcurrent detection devices is compared with the corresponding difference threshold value, thereby achieving abnormal warning for the other two overcurrent detection devices when any overcurrent detection device is used as the main device.

The above three overcurrent detection devices all adopt asynchronous sampling mode. There are differences in the crystal oscillator and power-on time of each overcurrent detection device. Therefore, at the same time section, the message sequence number sent by each device will be different, that is, the sampling sequence number difference. Under normal circumstances, the deviation between the sampling sequence numbers at different time sections remains unchanged.

In some embodiments, the time sections can be arranged according to the sampling period within a predetermined time period, and the first current value, the second current value, and the third current value associated with the sampling number can be stored in each time section. Further, multiple first current values, multiple second current values, and multiple third current values in multiple time sections can be stored. In some examples, when the corresponding sampling number point cannot be found according to the sampling number deviation value, it is sent to the monitoring background after judgment to achieve real-time warning.

When the first overcurrent detection device 510 receives the setting of the current rating of the energy storage valve control system, the current rating is enabled. The setting of the current rating can be set manually. Further, the first current value, the second current value and the third current value stored in each time section are compared with the preset current range. If the first current value, the second current value and the third current value are all within the preset current range, it is confirmed that the current first current value, the second current value and the third current value can be used for the calculation of the difference threshold value.

In some embodiments, the step of calculating the first difference threshold value, the second difference threshold value, and the third difference threshold value includes: performing a horizontal comparison of the sampling numbers under the same time section to obtain the sampling number differences between any two of the three overcurrent detection devices, as shown in FIG12, which provides a schematic diagram of the correspondence between the sampling numbers and sampling data of the overcurrent detection devices, wherein △n1 represents the sampling number difference between the first sampling number corresponding to the first overcurrent detection device 510 and the second sampling number corresponding to the second overcurrent detection device 520, and △n2 represents the sampling number difference between the second overcurrent detection device 520 The sampling number difference between the corresponding second sampling number and the third sampling number corresponding to the third overcurrent detection device 530, △n3 represents the sampling number difference between the first sampling number corresponding to the first overcurrent detection device 510 and the third sampling number corresponding to the third overcurrent detection device 530. Further, according to the corresponding sampling number difference, the first current difference △1 between the first current value and the second current value, the second current difference △2 between the first current value and the third current value, and the third current difference △3 between the second current value and the third current value are calculated respectively, and the calculation is similarly performed at other time sections. Further, the first current difference, the second current difference, and the third current difference at each time section are processed respectively to obtain the first difference threshold value, the second difference threshold value, and the third difference threshold value.

By accumulating the first current difference, the second current difference and the third current difference at multiple time sections, more reliable first difference threshold, second difference threshold and third difference threshold can be obtained accordingly.

In some embodiments, the first current difference, the second current difference and the third current difference at each time section are processed respectively to obtain the first difference threshold value, the second difference threshold value and the third difference threshold value, and the steps include: taking the average value of the first current difference, the second current difference and the third current difference at different time sections respectively, and correspondingly obtaining the first difference typical value, the second difference typical value and the third difference typical value, so as to determine the corresponding difference threshold values according to the difference typical values.

In some embodiments, based on the first difference typical value, the second difference typical value and the third difference typical value, the step of determining the first difference threshold value, the second difference threshold value and the third difference threshold value includes: multiplying each difference typical value by a preset threshold coefficient to determine the corresponding difference threshold value.

After each difference threshold value is determined, it is written into the flash and will not be lost when the power is off. Each difference threshold value is updated only when the enable command of the current rating is updated.

By adding a preset threshold coefficient to each typical difference value, a relatively accurate difference threshold value can be obtained, thereby improving the reliability of each difference threshold value.

When the three overcurrent detection devices in the three-out-of-two redundant structure 500 simultaneously execute the above-mentioned abnormal warning method, all warnings will adopt instantaneous alarm and delayed return strategies. The delay time can be set according to actual needs. In some examples, it is generally set to the time interval between three sampling data of the three overcurrent detection devices. The purpose of delayed return is to avoid fluctuations in sampling data, repeated alarms and increase the load on the CPU inside the device.

The above abnormal warning method realizes real-time warning of abnormal overcurrent detection device by horizontal data sharing among three overcurrent detection devices, and then any overcurrent detection device compares the horizontal data. Compared with the traditional technology that only relies on vertical data comparison in the valve control system for warning, this application makes the warning strategy in the new energy storage valve control system more perfect, enhances the reliability of the system, and improves the ability of fault monitoring and warning.

Please refer to FIG. 13, which is an application environment diagram of the protection device according to some embodiments of the present application. FIG. 13 shows a two-by-N-take-M redundant structure 700 as part of the energy storage valve control system, wherein N represents the number of overcurrent detection devices, which is an integer greater than or equal to 3, and M is an integer less than N. The two-by-N-take-M redundant structure 700 includes N overcurrent detection devices and two protection devices. The N overcurrent detection devices operate in parallel, including a first overcurrent detection device 710, a second overcurrent detection device 720, ..., an Nth overcurrent detection device 730. The two protection devices operate in parallel, including a first protection device 770 and a second protection device 780. The first overcurrent detection device 710 is suitable for sampling the first measurement unit 740 to obtain a first current value, the second overcurrent detection device 720 is suitable for sampling the second measurement unit 750 to obtain a second current value, and so on, the Nth overcurrent detection device 730 is suitable for sampling the Nth measurement unit 760 to obtain an Nth current value. Each of the two protection devices performs N out of M voting on the overcurrent detection results output by the first overcurrent detection device 710 to the Nth overcurrent detection device 730 and outputs the N out of M voting result. The two protection devices are connected to each other in a communicative manner. It can be understood that the two-by-N out of M redundant structure 700 can be regarded as including two N out of M redundant structures as described above, wherein the two N out of M redundant structures reuse N overcurrent detection devices.

It can be understood that the first protection device 770 and the second protection device 780 are protection devices with the same configuration and the same functions, and they are named differently only for the convenience of description. The structure of the protection device according to the embodiment of the present application is described below with reference to FIG. 14 , taking the first protection device 770 as an example.

As shown in FIG. 14 , the first protection device 770 may include a receiving unit 810, a difference calculation unit 820, and an early warning output unit 830. The receiving unit 810 is configured to receive the first current value of the first overcurrent detection device 710, the second current value of the second overcurrent detection device 720, ..., and the Nth current value of the Nth overcurrent detection device 730 at the same time section. The difference calculation unit 820 is configured to calculate the current difference between the first current value and the second current value to obtain the first current difference, and calculate the current difference between the first current value and the third current value to obtain the second current difference, and so on, calculate the current difference between the first current value and the Nth current value to obtain the N-1th current difference. The early warning output unit 830 is configured to output a first early warning signal indicating that the first overcurrent detection device 710 is abnormal when each of the first current difference value to the N-1th current difference value is greater than the corresponding first difference threshold value to the N-1th difference threshold value.

The above-mentioned protection device receives the current values of N overcurrent detection devices respectively through the receiving unit 810, and then obtains the first current difference to the N-1th current difference between the first current value and the other N-1 current values based on the first current value through the difference calculation unit 820, so that the first current difference to the N-1th current difference are compared with the corresponding difference threshold values through the early warning output unit 830, and when these N-1 current differences all exceed the corresponding difference threshold values, an abnormal early warning is implemented for the first overcurrent detection device 710.

The functional definition of each structural unit in the protection device in the following embodiments is similar to the functional definition of the corresponding structural unit in the first overcurrent detection device 210 mentioned above, and will not be repeated here.

In some embodiments, the difference calculation unit 820 is configured to respectively calculate the current differences between the Kth current value from the second current value to the Nth current value and the remaining current values from the second current value to the Nth current value. The warning output unit is configured to: when the K-1th current difference from the first current difference to the N-1th current difference is greater than the K-1th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold value, and the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value are greater than the corresponding difference threshold value, output a second warning signal, and the second warning signal indicates that the Kth overcurrent detection device is abnormal.

When only one current difference among the first current difference to the N-1th current difference is greater than the difference threshold value, for example, when only the K-1th current difference is greater than the K-1th difference threshold value, the early warning output unit 830 compares the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value with the corresponding difference threshold values, thereby realizing abnormal early warning of the second overcurrent detection device 720 to the Nth overcurrent detection device 730.

In some embodiments, as shown in FIG. 15 , the first protection device 770 further includes a storage unit 840 and a difference threshold value calculation unit 850. The storage unit 840 includes N buffers, which store the received first current value to the Nth current value respectively. In addition, the storage unit 840 can also store the sampling sequence number of each overcurrent detection device. The storage unit 840 is configured to store multiple first current values to the Nth current value in association with the sampling sequence number within a predetermined time period including multiple time sections. The difference threshold value calculation unit 850 is configured to calculate the first difference threshold value to the N-1th difference threshold value based on the stored multiple first current values to the Nth current value when each current value in the stored multiple first current values to the Nth current value is within the preset current range, and calculate the difference threshold values of the Kth current value relative to the remaining current values in the second current value to the Nth current value. The storage unit 840 is also configured to store all the difference threshold values.

In some embodiments, the difference calculation unit 820 is configured to calculate, at each time section within a predetermined time period, the first current difference to the N-1th current difference between the stored first current value and the stored second current value to the Nth current value according to the corresponding sampling sequence number, and to calculate the current differences between the Kth current value among the stored second current value to the Nth current value and the remaining current values among the second current value to the Nth current value.

The difference threshold value calculation unit 850 is configured to calculate the first difference threshold value to the N-1th difference threshold value based on the first current difference value to the N-1th current difference value at each time section, respectively; and to calculate the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value based on the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at each time section, respectively.

In some embodiments, the difference calculation unit 820 is configured to calculate the average value of each of the multiple first current difference values to the multiple N-1th current difference values under multiple time sections to obtain the first difference typical value to the N-1th difference typical value; respectively calculate the average values of each current difference between the Kth current value and the remaining current values from the second current value to the Nth current value under multiple time sections, and obtain the typical values of the differences of the Kth current value relative to the remaining current values from the second current value to the Nth current value.

The difference threshold value calculation unit 850 is configured to respectively calculate the product of the first difference typical value to the N-1th difference typical value and the preset threshold coefficient to obtain the first difference threshold value to the N-1th difference threshold value; and respectively calculate the product of each difference typical value of the Kth current value relative to the remaining current values from the second current value to the Nth current value and the preset threshold coefficient to obtain each difference threshold value of the Kth current value relative to the remaining current values from the second current value to the Nth current value.

In order to more specifically illustrate the technical solution of the present application regarding the protection device, the technical solution of the present application is described in detail below by taking the two-by-N-out-of-M redundant structure 700 in Figure 13 as a two-by-three-out-of-two redundant structure and the protection device as a three-out-of-two protection device as an example.

Please refer to FIG. 16, which is an application environment diagram of a three-out-of-two protection device according to other embodiments of the present application. FIG. 16 shows a two-by-three-out-of-two redundant structure 900 as part of an energy storage valve control system. The two-by-three-out-of-two redundant structure 900 includes three overcurrent detection devices and two three-out-of-two protection devices. The three overcurrent detection devices operate in parallel, including a first overcurrent detection device 910, a second overcurrent detection device 920, and a third overcurrent detection device 930. The two three-out-of-two protection devices operate in parallel, including a first three-out-of-two protection device 970 and a second three-out-of-two protection device 980. The first overcurrent detection device 910 is suitable for sampling the first measuring unit 940 to obtain a first current value, the second overcurrent detection device 920 is suitable for sampling the second measuring unit 950 to obtain a second current value, and the third overcurrent detection device 930 is suitable for sampling the third measuring unit 960 to obtain a third current value. Each of the two three-out-of-two protection devices performs a three-out-of-two vote on the overcurrent detection results output by the first overcurrent detection device 910, the second overcurrent detection device 920, and the third overcurrent detection device 930 and outputs a three-out-of-two voting result. The two three-out-of-two protection devices are connected to each other in a communicative manner. It can be understood that the two-by-three-out-of-two redundant structure 900 can be regarded as including two three-out-of-two redundant structures as described above, wherein the two three-out-of-two redundant structures reuse three overcurrent detection devices.

The structure of the three-out-of-two protection device according to the embodiment of the present application is described below by taking the first three-out-of-two protection device 970 as an example in combination with FIG. 17 .

As shown in FIG17 , the first three-out-of-two protection device 970 may include a receiving unit 901, a difference calculation unit 902, an early warning output unit 903, and a storage unit 904. The receiving unit 901 is configured to receive the first current value of the first overcurrent detection device 910, the second current value of the second overcurrent detection device 920, and the third current value of the third overcurrent detection device 930 at the same time section. The storage unit 904 includes three buffers, wherein the three buffers store the received first current value, the second current value, and the third current value, respectively. In addition, the storage unit 904 may also store the sampling sequence number of each overcurrent detection device, etc.

The difference calculation unit 902 is configured to calculate the absolute value of the current difference between the first current value and the second current value to obtain the first current difference, and calculate the absolute value of the current difference between the first current value and the third current value to obtain the second current difference.

The warning output unit 903 is configured to output a first warning signal indicating that the first overcurrent detection device 910 is abnormal when the first current difference is greater than a first difference threshold value and the second current difference is greater than a second difference threshold value.

The above-mentioned three-out-of-two protection device receives the current values of the three overcurrent detection devices respectively through the receiving unit 901, and then obtains the first current difference and the second current difference between the first current value and the other two sampling values respectively based on the first current value through the difference calculation unit 902, so as to compare the first current difference and the second current difference with the corresponding difference threshold values respectively through the early warning output unit 903, and when both current differences exceed the corresponding difference threshold values, an abnormal early warning is implemented for the first overcurrent detection device 910.

The functional definition of each structural unit in the two-out-of-three protection device in the following embodiments is similar to the functional definition of the corresponding structural unit in the first overcurrent detection device 510 described above, and will not be repeated here.

In some embodiments, the difference calculation unit 902 is configured to calculate a third current difference between the second current value and the third current value.

The early warning output unit 903 is configured to output a second early warning signal when the first current difference is greater than the first difference threshold value, the second current difference is less than or equal to the second difference threshold value, and the third current difference is greater than the third difference threshold value, and the second early warning signal indicates that the second overcurrent detection device 920 is abnormal; and is also configured to output a third early warning signal when the first current difference is less than or equal to the first difference threshold value, the second current difference is greater than the second difference threshold value, and the third current difference is greater than the third difference threshold value, and the third early warning signal indicates that the third overcurrent detection device 930 is abnormal.

When only one of the first current difference and the second current difference is greater than the difference threshold, the warning output unit 903 compares the third current difference with the third difference threshold to provide an abnormal warning for the second overcurrent detection device 920 and the third overcurrent detection device 930.

In some embodiments, the storage unit 904 is configured to store a plurality of first current values, a plurality of second current values, and a plurality of third current values in association with the sampling sequence numbers within a predetermined time period.

As shown in Figure 18, the first three-to-two protection device 970 also includes a difference threshold value calculation unit 905, which is configured to calculate a first difference threshold value, a second difference threshold value and a third difference threshold value based on the stored multiple first current values, multiple second current values and multiple third current values when each of the stored multiple first current values, multiple second current values and multiple third current values is within a preset current range.

The storage unit 904 is configured to store a first difference threshold value, a second difference threshold value, and a third difference threshold value.

In some embodiments, the difference calculation unit 902 is configured to calculate, at each time section within a predetermined time period, a first current difference between the first current value and the second current value, a second current difference between the first current value and the third current value, and a third current difference between the second current value and the third current value according to the corresponding sampling sequence number;

The difference threshold value calculation unit 905 is configured to calculate a first difference threshold value, a second difference threshold value and a third difference threshold value based on the first current difference value, the second current difference value and the third current difference value in each time section, respectively.

In some embodiments, the difference calculation unit 902 is configured to calculate an average value of a plurality of first current difference values at a plurality of time sections to obtain a first difference typical value; calculate an average value of a plurality of second current difference values at a plurality of time sections to obtain a second difference typical value; and calculate an average value of a plurality of third current difference values at a plurality of time sections to obtain a third difference typical value;

The difference threshold value calculation unit 905 is configured to calculate the product of the first difference typical value and the preset threshold coefficient to obtain the first difference threshold value; calculate the product of the second difference typical value and the preset threshold coefficient to obtain the second difference threshold value; and calculate the product of the third difference typical value and the preset threshold coefficient to obtain the third difference threshold value.

In some embodiments, as shown in FIG19, an abnormal warning method with a protection device as the execution subject is provided. This embodiment is illustrated by applying the method to the double-N-take-M redundant structure 700 in the energy storage valve control system shown in FIG13. The implementation scheme for solving the problem provided by the method is similar to the implementation scheme recorded in the abnormal warning method with the first overcurrent detection device 210 as the execution subject in FIG8 above, so the specific limitations in the embodiments provided below can refer to the limitations of the above method, and will not be repeated here.

The method is performed by any one of the two protection devices. When performed by the first protection device 770, the method includes:

In step S310 , a first current value to an Nth current value are received from the first over-current detection device 710 to the Nth over-current detection device 730 , respectively.

Specifically, the first protection device 770 includes N buffers, wherein the N buffers respectively store the real-time current values and sampling numbers of the N overcurrent detection devices, so that at the same time section, the first protection device 770 respectively receives the first current value of the first overcurrent detection device 710, the second current value of the second overcurrent detection device 720, and the Nth current value of the Nth overcurrent detection device 730, and stores the first current value to the Nth current value in the corresponding buffer. In some examples, the first current value to the Nth current value are instantaneous values of the current.

In step S320 , a first current difference value to an N−1th current difference value are calculated, where the first current difference value to an N−1th current difference value represent current differences between the first current value and the second current value to an Nth current value, respectively.

Step S330, when the first current difference to the N-1th current difference are respectively greater than the first difference threshold to the N-1th difference threshold corresponding to the first current difference to the N-1th current difference, a first warning signal is output, and the first warning signal indicates that the first overcurrent detection device 710 is abnormal.

The above-mentioned abnormal warning method takes the first protection device 770 as the main device, receives the current values of N overcurrent detection devices respectively, and takes the first current value as the reference to obtain the current difference between the first current value and the other N-1 current values respectively, and then compares the first current difference to the N-1th current difference with the corresponding difference threshold value respectively. When these N-1 current differences all exceed the corresponding difference threshold value, an abnormal warning is issued to the first overcurrent detection device 710 corresponding to the first current value. Similarly, horizontal warning is achieved by comparing the sampling data between each overcurrent detection device.

In some embodiments, the method also includes: respectively calculating the current differences between the Kth current value among the second current value to the Nth current value and the remaining current values among the second current value to the Nth current value; and when the K-1th current difference among the first current difference value to the N-1th current difference is greater than the K-1th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold value, and the current differences between the Kth current value and the remaining current values among the second current value to the Nth current value are greater than the corresponding difference threshold value, outputting a second warning signal, and the second warning signal indicates that the Kth overcurrent detection device is abnormal.

In some embodiments, the method also includes: storing multiple first to Nth current values in association with a sampling sequence number within a predetermined time period including multiple time sections; and when each of the stored multiple first to Nth current values is within a preset current range, calculating the first difference threshold value to the N-1th difference threshold value based on the stored multiple first to Nth current values, and calculating each difference threshold value of the Kth current value relative to the remaining current values from the second to Nth current values.

In some embodiments, calculating the first difference threshold value to the N-1th difference threshold value, and calculating each difference threshold value of the Kth current value relative to the remaining current values from the second current value to the Nth current value, includes: at each time section within a predetermined time period, calculating the first current difference to the N-1th current difference between the stored first current value and the stored second current value to the Nth current value according to the corresponding sampling sequence number, and calculating each current difference between the Kth current value and the remaining current values from the second current value to the Nth current value; and calculating the first difference threshold value to the N-1th difference threshold value based on the first current difference to the N-1th current difference at each time section; and calculating each difference threshold value of the Kth current value relative to the remaining current values from the second current value to the Nth current value based on the current difference between the Kth current value and the remaining current values from the second current value to the Nth current value at each time section.

In some embodiments, based on the first current difference value to the N-1th current difference value at each time section, the first difference threshold value to the N-1th difference threshold value are calculated; and based on the current difference values of the Kth current value and the remaining current values from the second current value to the Nth current value at each time section, the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value are calculated, including: calculating the average value of each of the multiple first current differences to the multiple N-1th current differences at multiple time sections to obtain the first difference typical value to the N-1th difference typical value; calculating the first difference typical value to the N-1th difference typical value respectively. The product of the typical value of the N-1th difference and the preset threshold coefficient is obtained to obtain the first difference threshold value to the N-1th difference threshold value; the average values of the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value under multiple time sections are calculated one by one to obtain the typical values of the differences between the Kth current value and the remaining current values from the second current value to the Nth current value; and the product of the typical values of the differences between the Kth current value and the remaining current values from the second current value to the Nth current value and the preset threshold coefficient is calculated to obtain the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value.

In other embodiments, as shown in FIG. 20 , an abnormal warning method is provided. The implementation solution for solving the problem provided by the method is similar to the implementation solution recorded in the abnormal warning method with the first overcurrent detection device 510 as the execution body in FIG. 10 above. Therefore, the specific limitations in the embodiments provided below can refer to the limitations of the above method and will not be repeated here.

This embodiment is illustrated by applying the method to a two-by-three-out-of-two redundant structure 900 in an energy storage valve control system shown in FIG. 16 , wherein the method is executed by any one of two three-out-of-two protection devices. When executed by the first three-out-of-two protection device 970, the method includes:

Step S410 , receiving a first current value, a second current value and a third current value from the first overcurrent detection device 910 , the second overcurrent detection device 920 and the third overcurrent detection device 930 respectively.

Specifically, the first three-out-of-two protection device 970 includes three buffers, wherein the three buffers respectively store the real-time current values and sampling sequence numbers of the three overcurrent detection devices. Therefore, at the same time section, the first three-out-of-two protection device 970 respectively receives the first current value of the first overcurrent detection device 910, the second current value of the second overcurrent detection device 920, and the third current value of the third overcurrent detection device 930, and stores the first current value, the second current value, and the third current value in the corresponding buffers. In some examples, the first current value, the second current value, and the third current value are all instantaneous values of the current.

Step S420, calculating a first current difference between the first current value and the second current value; calculating a second current difference between the first current value and the third current value.

Specifically, the first current difference is the absolute value of the instantaneous current difference between the first overcurrent detection device 910 and the second overcurrent detection device 920 , and the second current difference is the absolute value of the instantaneous current difference between the first overcurrent detection device 910 and the third overcurrent detection device 930 .

Step S430, when the first current difference is greater than the first difference threshold value, and the second current difference is greater than the second difference threshold value, a first warning signal is output, and the first warning signal indicates that the first overcurrent detection device 910 is abnormal.

Specifically, the first difference threshold value is a current difference threshold value between the first overcurrent detection device 910 and the second overcurrent detection device 920, and the second difference threshold value is a current difference threshold value between the first overcurrent detection device 910 and the third overcurrent detection device 930. The first current difference between the first overcurrent detection device 910 and the second overcurrent detection device 920 is compared with the corresponding first difference threshold value, and the second current difference between the first overcurrent detection device 910 and the third overcurrent detection device 930 is compared with the corresponding second difference threshold value. According to the comparison result, an abnormal overcurrent detection device can be detected.

When the first current difference is greater than the first difference threshold value, and the second current difference is greater than the second difference threshold value, it is determined that the first overcurrent detection device 910 is abnormal, outputs a first warning signal, and sends it to the monitoring background to achieve real-time warning.

The above-mentioned abnormal warning method uses the first three-out-of-two protection device 970 as the main device, receives the current values of the three overcurrent detection devices respectively, and takes the first current value as a reference to obtain the first current difference and the second current difference between the first current value and the other two sampling values, and compares the first current difference and the second current difference with the corresponding difference threshold values respectively. When both current differences exceed the corresponding difference threshold values, an abnormal warning is issued to the first overcurrent detection device corresponding to the first current value. Similarly, lateral warning is achieved by comparing the sampling data between the overcurrent detection devices, thereby enhancing the ability of multi-directional monitoring of the bridge arm current, enhancing the ability of panoramic fault monitoring and warning of the energy storage valve control system, and reducing the dead zone of the warning, thereby protecting the reliable operation of the valve control system from all directions and angles.

In some embodiments, the method also includes: calculating a third current difference between the second current value and the third current value; when the first current difference is greater than the first difference threshold value, the second current difference is less than or equal to the second difference threshold value, and the third current difference is greater than the third difference threshold value, outputting a second warning signal, and the second warning signal indicates that the second overcurrent detection device 920 is abnormal; and when the first current difference is less than or equal to the first difference threshold value, the second current difference is greater than the second difference threshold value, and the third current difference is greater than the third difference threshold value, outputting a third warning signal, and the third warning signal indicates that the third overcurrent detection device 930 is abnormal.

In some embodiments, the method also includes: storing multiple first current values, multiple second current values, and multiple third current values in association with a sampling sequence number within a predetermined time period including multiple time sections; when each of the stored multiple first current values, multiple second current values, and multiple third current values is within a preset current range, calculating a first difference threshold value, a second difference threshold value, and a third difference threshold value based on the stored multiple first current values, multiple second current values, and multiple third current values.

In some embodiments, calculating the first difference threshold value, the second difference threshold value and the third difference threshold value includes: at each time section within a predetermined time period, calculating the first current difference between the stored first current value and the second current value, the second current difference between the first current value and the third current value, and the third current difference between the second current value and the third current value according to the corresponding sampling sequence number; and processing based on the first current difference, the second current difference and the third current difference at each time section to obtain the first difference threshold value, the second difference threshold value and the third difference threshold value.

In some embodiments, the first current difference, the second current difference, and the third current difference at each time section are processed respectively to obtain a first difference threshold, a second difference threshold, and a third difference threshold, including:

Calculate an average value of a plurality of first current difference values at a plurality of time sections to obtain a typical value of the first difference value;

Calculate the product of the first difference typical value and the preset threshold coefficient to obtain a first difference threshold value;

Calculate the average value of multiple second current difference values at multiple time sections to obtain a typical value of the second difference value;

Calculate the product of the second difference typical value and the preset threshold coefficient to obtain the second difference threshold value;

Calculating an average value of a plurality of third current difference values at a plurality of time sections to obtain a typical value of the third difference value; and

The product of the third difference typical value and the preset threshold coefficient is calculated to obtain the third difference threshold value.

The above-mentioned abnormal warning methods are all applicable to valve control systems in engineering integration applications of AC/DC microgrid/distribution network technology and battery energy storage technology. In addition to being applicable to abnormal warnings for multiple overcurrent detection devices in the valve control system, they can also be applied to abnormal warnings between multiple devices of the same level in other power scenarios.

It should be understood that, although the steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

In some embodiments, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by a dedicated circuit, or can be completed by instructing related hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to a memory, a database or other medium used in the embodiments provided in the present application can include at least one of a non-volatile and a volatile memory. Non-volatile memory can include a read-only memory (ROM), a magnetic tape, a floppy disk, a flash memory, an optical memory, a high-density embedded non-volatile memory, a resistive random access memory (ReRAM), a magnetoresistive random access memory (MRAM), a ferroelectric random access memory (FRAM), a phase change memory (PCM), a graphene memory, etc. Volatile memory can include a random access memory (RAM) or an external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The processor involved in each embodiment provided in this application can be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, etc., but is not limited thereto.

The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

An overcurrent detection device operates in parallel with N-1 other overcurrent detection devices in an N-to-M redundant structure of an energy storage valve control system, wherein N is an integer greater than or equal to 3, and M is an integer less than N. The overcurrent detection device is communicatively connected to the N-1 other overcurrent detection devices, respectively, and the overcurrent detection device comprises:

a sampling unit configured to sample the first measuring unit to obtain a first current value;

a transceiver unit configured to receive, from the N-1 other overcurrent detection devices, second current values to Nth current values obtained by each overcurrent detection device sampling the corresponding measurement unit;

a difference calculation unit configured to calculate a first current difference to an N-1th current difference, wherein the first current difference to the N-1th current difference represent current differences between the first current value and the second current value to the Nth current value, respectively; and

An early warning output unit is configured to output a first early warning signal when the first current difference to the N-1th current difference are respectively greater than a first difference threshold to an N-1th difference threshold corresponding to the first current difference to the N-1th current difference, wherein the first early warning signal indicates that the overcurrent detection device is abnormal.
The overcurrent detection device according to claim 1 is characterized in that:

The difference calculation unit is further configured to respectively calculate current differences between a Kth current value from the second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and

The warning output unit is also configured as:

When the K-1th current difference among the first current difference value to the N-1th current difference value is greater than the K-1th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold values, and the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value are respectively greater than the corresponding difference threshold values, a second warning signal is output, and the second warning signal indicates that the overcurrent detection device that samples the Kth current value is abnormal.
The overcurrent detection device according to claim 2, characterized in that the overcurrent detection device further comprises:

a storage unit configured to store a plurality of first to Nth current values in association with sampling sequence numbers within a predetermined time period including a plurality of time sections; and

A difference threshold value calculation unit is configured to calculate the first difference threshold value to the N-1th difference threshold value based on the stored multiple first current values to the Nth current values when each current value among the stored multiple first current values to the Nth current values is within a preset current range, and calculate each difference threshold value of the Kth current value relative to the remaining current values among the second current value to the Nth current value.
The overcurrent detection device according to claim 3 is characterized in that:

The difference calculation unit is configured to: calculate, at each time section within the predetermined time period, according to the corresponding sampling sequence number, the first current difference to the N-1th current difference between the stored first current value and the stored second current value to the Nth current value, and calculate the current differences between the Kth current value from the stored second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and

The difference threshold value calculation unit is configured to: calculate the first difference threshold value to the N-1th difference threshold value based on the first current difference value to the N-1th current difference value at each time section; and calculate the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value based on the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at each time section.
The overcurrent detection device according to claim 4 is characterized in that:

The difference calculation unit is configured to: calculate the average value of each of the multiple first current difference values to the multiple N-1th current difference values under the multiple time sections to obtain the first difference typical value to the N-1th difference typical value; calculate the average values of the current difference values of the Kth current value and the remaining current values from the second current value to the Nth current value under the multiple time sections in a one-to-one correspondence to each other, to obtain the difference typical values of the Kth current value relative to the remaining current values from the second current value to the Nth current value; and

The difference threshold value calculation unit is configured to: respectively calculate the product of the first difference typical value to the N-1th difference typical value and the preset threshold coefficient to obtain the first difference threshold value to the N-1th difference threshold value; and respectively calculate the product of each difference typical value of the Kth current value relative to the remaining current values from the second current value to the Nth current value and the preset threshold coefficient to obtain each difference threshold value of the Kth current value relative to the remaining current values from the second current value to the Nth current value.
An abnormality warning method, the method is applied to an N-out-of-M redundant structure in an energy storage valve control system, wherein N is an integer greater than or equal to 3, and M is an integer less than N, the N-out-of-M redundant structure includes a first overcurrent detection device to an N-th overcurrent detection device operating in parallel, and a protection device, the first overcurrent detection device to the N-th overcurrent detection device is suitable for sampling a first measurement unit to an N-th measurement unit to obtain a first current value to an N-th current value, the protection device is suitable for performing N-out-of-M voting on the overcurrent detection results output by the first overcurrent detection device to the N-th overcurrent detection device and outputting the N-out-of-M voting result, wherein any overcurrent detection device from the first overcurrent detection device to the N-th overcurrent detection device is communicatively connected to N-1 other overcurrent detection devices respectively, the method is performed by any overcurrent detection device from the first overcurrent detection device to the N-th overcurrent detection device, and when the method is performed by the first overcurrent detection device, the method includes:

receiving a second current value to an Nth current value from the second overcurrent detection device to the Nth overcurrent detection device respectively;

calculating a first current difference value to an N-1th current difference value, wherein the first current difference value to the N-1th current difference value represent current differences between the first current value and the second current value to the Nth current value, respectively; and

When the first current difference to the N-1th current difference are respectively greater than the first difference threshold to the N-1th difference threshold corresponding to the first current difference to the N-1th current difference, a first warning signal is output, and the first warning signal indicates that the first overcurrent detection device is abnormal.
The method according to claim 6, further comprising:

respectively calculating current differences between a Kth current value from the second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and

When the K-1th current difference among the first current difference to the N-1th current difference is greater than the K-1th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold values, and the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value are respectively greater than the corresponding difference threshold values, a second warning signal is output, and the second warning signal indicates that the Kth overcurrent detection device is abnormal.
The method according to claim 7, further comprising:

storing a plurality of first to Nth current values in association with sampling sequence numbers within a predetermined time period including a plurality of time sections; and

When each current value among the multiple first current values to the Nth current values stored is within a preset current range, the first difference threshold value to the N-1th difference threshold value are calculated based on the multiple first current values to the Nth current values stored, and the difference threshold values of the Kth current value relative to the remaining current values among the second current value to the Nth current value are calculated.
The method according to claim 8, characterized in that the calculating of the first difference threshold value to the N-1th difference threshold value, and the calculating of the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value, comprises:

At each time section within the predetermined time period, respectively calculating the first current difference to the N-1th current difference between the stored first current value and the stored second current value to the Nth current value according to the corresponding sampling sequence number, and respectively calculating the current difference between the Kth current value from the stored second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and

The first difference threshold value to the N-1th difference threshold value are calculated based on the first current difference value to the N-1th current difference value at each time section respectively; and the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value are calculated based on the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at each time section respectively.
The method according to claim 9, characterized in that the calculating the first difference threshold value to the N-1th difference threshold value based on the first current difference value to the N-1th current difference value at each time section respectively; and calculating the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value based on the current differences of the Kth current value and the remaining current values from the second current value to the Nth current value at each time section respectively, comprises:

Calculating an average value of each of the plurality of first current difference values to the plurality of N-1th current difference values under the plurality of time sections to obtain a first difference typical value to an N-1th difference typical value;

Calculate the product of the first difference typical value to the N-1th difference typical value and the preset threshold coefficient respectively to obtain the first difference threshold value to the N-1th difference threshold value;

Calculating respectively the average values of the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at the multiple time sections, to obtain typical values of the differences between the Kth current value and the remaining current values from the second current value to the Nth current value; and

The products of the typical values of the differences between the Kth current value and the remaining current values from the second current value to the Nth current value and the preset threshold coefficient are calculated respectively to obtain the threshold values of the differences between the Kth current value and the remaining current values from the second current value to the Nth current value.
A protection device is located in an N-out-of-M redundant structure of an energy storage valve control system, wherein N is an integer greater than or equal to 3, and M is an integer less than N. The protection device is suitable for performing N-out-of-M voting on overcurrent detection results output by a first overcurrent detection device to an Nth overcurrent detection device running in parallel and outputting an N-out-of-M voting result, and the protection device comprises:

a receiving unit configured to receive a first current value to an Nth current value from the first overcurrent detection device to the Nth overcurrent detection device, respectively;

a difference calculation unit configured to calculate a first current difference to an N-1th current difference, wherein the first current difference to the N-1th current difference represent current differences between the first current value and the second current value to the Nth current value, respectively; and

An early warning output unit is configured to output a first early warning signal when the first current difference to the N-1th current difference are respectively greater than a first difference threshold to an N-1th difference threshold corresponding to the first current difference to the N-1th current difference, wherein the first early warning signal indicates that the first overcurrent detection device is abnormal.
The protection device according to claim 11, characterized in that

The difference calculation unit is configured to respectively calculate current differences between a Kth current value from the second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and

The warning output unit is configured as follows:

When the K-1th current difference among the first current difference to the N-1th current difference is greater than the K-1th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold values, and the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value are greater than the corresponding difference threshold values, a second warning signal is output, and the second warning signal indicates that the Kth overcurrent detection device is abnormal.
The protection device according to claim 12, characterized in that the protection device further comprises:

a storage unit configured to store a plurality of first to Nth current values in association with sampling sequence numbers within a predetermined time period including a plurality of time sections; and

A difference threshold value calculation unit is configured to calculate the first difference threshold value to the N-1th difference threshold value based on the stored multiple first current values to the Nth current values when each current value among the stored multiple first current values to the Nth current values is within a preset current range, and calculate each difference threshold value of the Kth current value relative to the remaining current values among the second current value to the Nth current value.
The protection device according to claim 13, characterized in that

The difference calculation unit is configured to: at each time section within the predetermined time period, respectively calculate the first current difference to the N-1th current difference between the stored first current value and the stored second current value to the Nth current value according to the corresponding sampling sequence number, and respectively calculate the current differences between the Kth current value from the stored second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and

The difference threshold value calculation unit is configured to: calculate the first difference threshold value to the N-1th difference threshold value based on the first current difference value to the N-1th current difference value at each time section; and calculate the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value based on the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at each time section.
The protection device according to claim 14, characterized in that

The difference calculation unit is configured to: calculate the average value of each of the multiple first current difference values to the multiple N-1th current difference values under the multiple time sections to obtain the first difference typical value to the N-1th difference typical value; calculate the average values of the current difference values of the Kth current value and the remaining current values from the second current value to the Nth current value under the multiple time sections in a one-to-one correspondence to each other, to obtain the difference typical values of the Kth current value relative to the remaining current values from the second current value to the Nth current value; and

The difference threshold value calculation unit is configured to: respectively calculate the product of the first difference typical value to the N-1th difference typical value and the preset threshold coefficient to obtain the first difference threshold value to the N-1th difference threshold value; and respectively calculate the product of each difference typical value of the Kth current value relative to the remaining current values from the second current value to the Nth current value and the preset threshold coefficient to obtain each difference threshold value of the Kth current value relative to the remaining current values from the second current value to the Nth current value.
An abnormal warning method, the method is applied to an N-out-of-M redundant structure in an energy storage valve control system, wherein N is an integer greater than or equal to 3, and M is an integer less than N. The N-out-of-M redundant structure includes a first overcurrent detection device to an N-th overcurrent detection device operating in parallel, and a protection device, wherein the first overcurrent detection device to the N-th overcurrent detection device are suitable for sampling a first measurement unit to an N-th measurement unit to obtain a first current value to an N-th current value, and the protection device is suitable for performing N-out-of-M voting on the overcurrent detection results output by the first overcurrent detection device to the N-th overcurrent detection device and outputting the N-out-of-M voting result, wherein the method is performed by the protection device, and the method includes:

receiving a first current value to an Nth current value from the first overcurrent detection device to the Nth overcurrent detection device respectively;

calculating a first current difference value to an N-1th current difference value, wherein the first current difference value to the N-1th current difference value represent current differences between the first current value and the second current value to the Nth current value, respectively; and

When the first current difference to the N-1th current difference are respectively greater than the first difference threshold to the N-1th difference threshold corresponding to the first current difference to the N-1th current difference, a first warning signal is output, and the first warning signal indicates that the first overcurrent detection device is abnormal.
The method according to claim 16, further comprising:

respectively calculating current differences between a Kth current value from the second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and

When the K-1th current difference among the first current difference to the N-1th current difference is greater than the K-1th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold values, and each current difference between the Kth current value and the remaining current values from the second current value to the Nth current value is greater than the corresponding difference threshold values, a second warning signal is output, and the second warning signal indicates that the Kth overcurrent detection device is abnormal.
The method according to claim 17, further comprising:

storing a plurality of first to Nth current values in association with sampling numbers within a predetermined time period including a plurality of time sections; and

When each current value among the multiple first current values to the Nth current values stored is within a preset current range, the first difference threshold value to the N-1th difference threshold value are calculated based on the multiple first current values to the Nth current values stored, and the difference threshold values of the Kth current value relative to the remaining current values among the second current value to the Nth current value are calculated.
The method according to claim 18, characterized in that the calculating of the first difference threshold value to the N-1th difference threshold value, and the calculating of the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value, comprises:

At each time section within the predetermined time period, respectively calculating the first current difference to the N-1th current difference between the stored first current value and the stored second current value to the Nth current value according to the corresponding sampling sequence number, and respectively calculating the current difference between the Kth current value from the stored second current value to the Nth current value and the remaining current values from the second current value to the Nth current value; and

The first difference threshold value to the N-1th difference threshold value are calculated based on the first current difference value to the N-1th current difference value at each time section respectively; and the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value are calculated based on the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at each time section respectively.
The method according to claim 19, characterized in that the calculating the first difference threshold value to the N-1th difference threshold value based on the first current difference value to the N-1th current difference value at each time section respectively; and calculating the difference threshold values of the Kth current value relative to the remaining current values from the second current value to the Nth current value based on the current differences of the Kth current value and the remaining current values from the second current value to the Nth current value at each time section respectively, comprising:

Calculating an average value of each of the plurality of first current difference values to the plurality of N-1th current difference values under the plurality of time sections to obtain a first difference typical value to an N-1th difference typical value;

Calculate the product of the first difference typical value to the N-1th difference typical value and the preset threshold coefficient respectively to obtain the first difference threshold value to the N-1th difference threshold value;

Calculating respectively the average values of the current differences between the Kth current value and the remaining current values from the second current value to the Nth current value at the multiple time sections, to obtain typical values of the differences between the Kth current value and the remaining current values from the second current value to the Nth current value; and

The products of the typical values of the differences between the Kth current value and the remaining current values from the second current value to the Nth current value and the preset threshold coefficient are calculated respectively to obtain the threshold values of the differences between the Kth current value and the remaining current values from the second current value to the Nth current value.
A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of the method described in any one of claims 6 to 10 and 16 to 20 are implemented.