WO2022052830A1

WO2022052830A1 - Valve based control and protection method, and device and storage medium

Info

Publication number: WO2022052830A1
Application number: PCT/CN2021/115361
Authority: WO
Inventors: 谢敏华; 路建良; 唐茹彬; 李强; 武思捷
Original assignee: 国家电网有限公司; 全球能源互联网研究院有限公司
Priority date: 2020-09-10
Filing date: 2021-08-30
Publication date: 2022-03-17
Also published as: CN112054486B; CN112054486A

Abstract

The embodiments of the present application disclose a valve based control and protection method, comprising: when a valve based control detects that a fault occurs in the valve based control, starting timing and generating a fault duration; if the fault duration exceeds a first preset time and a locking instruction issued by an upper layer control unit is not received, the valve based control generating a converter valve locking signal and outputting same; and if the fault duration exceeds a second preset time, the valve based control generating a converter valve operation exiting signal and outputting same, the second preset time being greater than the first preset time.

Description

A valve base control and protection method, equipment and storage medium

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with the application number of 202010950384.9 and the filing date of September 10, 2020, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated by reference into this application.

technical field

The present application relates to the technical field of flexible direct current transmission, in particular to a valve base control and protection method, device and storage medium.

Background technique

Flexible DC transmission based on Modular Multilevel Converter (MMC, Modular Multilevel Converter) is known as the third generation transmission technology after AC transmission and conventional DC transmission. Load power supply, grid interconnection, island/drilling platform power supply and other fields have broad application prospects.

The core equipment of HVDC flexible transmission project mainly includes converter valve (VALVE), valve-based control equipment (VBC, Valve Based Control) and pole control protection system (PCP, Pole Control and Protection), etc. Among them, the converter valve is responsible for the DC-AC conversion and AC-DC conversion in the flexible DC transmission project. Hundreds or even thousands of sub-modules are connected in series, and each sub-module must be individually controlled, protected and monitored. The valve base control equipment is the intermediate hub connecting the pole control protection system and the converter valve, and is responsible for the operation control and safety protection of the entire converter valve.

Under normal circumstances, the control cycle of the valve base control device is synchronized with the upper-level device (polar control and protection device), and the control cycle of the lower-level device inside the valve-base control device is synchronized with the upper-level valve-based control device, and is sent to all sub-modules in each control cycle. Issue control commands to control the opening and closing of the Insulated Gate Bipolar Transistor (IGBT, Insulated Gate Bipolar Transistor) of the sub-module. When the valve base control device fails or the communication fails to receive the upper-level control command, the latest control command of the upper-level device cannot be sent to the sub-module, and the sub-module control method is not suitable, which may easily cause overcurrent, overvoltage and other faults, resulting in sub-module damage. In severe cases, it will lead to avalanche breakdown of a large number of sub-module IGBTs.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a valve base control protection method, device and storage medium, so as to solve the problem in the prior art that when the valve base control device fails, the sub-modules are damaged, and in severe cases, IGBT avalanche breakdown of a large number of sub-modules is caused. .

An embodiment of the present application provides a valve base control and protection method. The valve base control and protection method includes: when a valve base control device detects that the valve base control device is faulty, start timing to generate a fault duration; When the first preset time is exceeded and the blocking instruction issued by the upper-layer control unit is not received, the valve base control device generates and outputs the blocking converter valve signal; when the fault duration exceeds the second preset time, the The valve base control device generates and outputs a signal that the converter valve is out of operation, and the second preset time is greater than the first preset time.

In some optional embodiments of the present application, the valve-based control device includes: at least one layer of control units.

In some optional embodiments of the present application, the failure of the valve base control device includes: a main body failure and/or an upload failure of the lower layer control unit.

In some optional embodiments of the present application, the main body failure includes: any downlink communication failure of the upper-layer control unit, abnormal heartbeat signal of the upper-layer control unit, all power supply failures of the control unit at this layer, or uplink communication failure of the lower-layer control unit one or more.

In some optional embodiments of the present application, when the valve base control device detects that the failure of the valve base control device is a downlink communication failure of the upper-layer control unit, the method further includes: according to the last normal operation before the failure occurs The sequence during communication generates the control sequence start signal required by the control unit of this layer.

In some optional embodiments of the present application, the converter valve out of operation signal is used to inform the converter valve sub-module to no longer execute the switching instruction issued by the valve base control device, and the valve base control device Execute sub-module bypass function shielding when downlink communication fails.

In some optional embodiments of the present application, when different layers of control units in the valve base control device fail, the values of the first preset time and the second preset time are different.

In some optional embodiments of the present application, the valve base control and protection method further includes: after the valve base control device detects that the valve base control device has recovered from the fault, the valve base control device follows the lower level of the upper-layer control unit. The latest command issued will generate the unlock command and enable signal and output it.

Embodiments of the present application further provide a valve base control device, comprising: a processor and a memory for storing a computer program that can be executed on the processor, wherein the processor is configured to execute the present application when the computer program is executed The steps of the valve base control and protection method described in the embodiment.

Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, implements the steps of the valve base control and protection method described in the embodiments of the present application.

The valve base control protection method, device, and storage medium provided by the embodiments of the present application can control the converter valve when any layer of the valve base control device fails without additional physical connections between control units. It can smoothly transition to the state of blocking and shutdown, ensuring that the converter valve is in a controlled state during the whole process, thereby effectively improving the reliability of the operation of the converter valve; and fully consider the redundant system switching, all sub-modules try to be at the same time Blocking and other strategies can effectively improve the reliability of the on-site converter valve operation and reduce the voltage pressure on the converter valve sub-module in case of failure. At the same time, depending on the location of the fault, the time for each control unit of the valve-based control equipment to protect the outlet is also different to ensure that the protection action can effectively cooperate with other system-level protection outlets.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the accompanying drawings required in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a flowchart of a valve base control and protection method according to an embodiment of the present application;

2 is a block diagram of each unit structure of a valve base control and protection method according to an embodiment of the present application;

FIG. 3 is a structural block diagram of each unit of a valve base control and protection method according to another embodiment of the present application.

detailed description

The technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by ” etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, It is constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the embodiments of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a Detachable connection, or 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 also be the internal connection of two components, which can be a wireless connection or a is a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

As described in the background art, in the current flexible direct current transmission project, the valve-based control device is the intermediate hub connecting the pole control protection system and the converter valve, and is responsible for the operation control and safety protection of the entire converter valve. In order to prevent the converter valve sub-module from being damaged due to the failure of the valve base control device, redundant systems or independent optical fiber channels are used in the prior art. However, these two methods cannot prevent the converter valve sub-module from being damaged by the valve base control device. Damage caused by a fault may result in an uncontrolled state of the converter valve sub-module.

In view of this, an embodiment of the present application provides a valve base control and protection method. As shown in FIG. 1 , the valve base control and protection method includes the following steps:

Step S101 : when the valve base control device detects a failure of the valve base control device, it starts timing and generates the failure duration.

Optionally, the valve base control device includes at least one layer of control units; when there are two layers of control units, the two layers of control units may include an uppermost layer of control units and a lowermost layer of control units; when there are three layers of control units, three layers of control units The control unit may include an uppermost layer control unit, a middle layer control unit, and a lowermost layer control unit. When the valve base control device detects the failure of any layer of control units, it starts timing at the same time, and generates the failure duration.

Step S102: When the fault duration exceeds the first preset time and the blocking instruction issued by the upper-layer control unit is not received, the valve base control device generates and outputs a blocking converter valve signal.

Optionally, when any layer of the valve base control device does not receive the blocking instruction issued by the upper layer control unit (such as the pole control protection system, the uppermost layer control unit or the middle layer control unit) within the first preset time, then The faulty control unit of this layer generates and outputs the blocking converter valve signal, and finally reaches the converter valve sub-module to realize the blocking of the converter valve sub-module.

Step S103 : when the fault duration exceeds the second preset time, the valve base control device generates and outputs a signal that the converter valve is out of operation; the second preset time is greater than the first preset time.

Optionally, when the failure duration of any layer of the valve-based control device exceeds the second preset time, the control unit of the layer in which the failure occurs autonomously generates the converter valve exiting operation signal and outputs it to the lower layer control unit, and finally reaches the replacement valve. The flow valve sub-module realizes the shutdown of the converter valve sub-module.

The valve base control and protection method provided by the embodiments of the present application can control the converter valve to smoothly transition to blocking when any layer of the valve base control device fails without additional physical connections between control units. , shutdown state, to ensure that the converter valve is in a controlled state during the whole process; and fully consider strategies such as redundant system switching, all sub-modules are blocked at the same time as possible, effectively improving the reliability of the on-site converter valve operation and reducing Voltage pressure on the commutator valve sub-module in case of failure.

In an optional embodiment, the failure of the valve base control device includes: a main body failure and/or an upload failure of the lower-level control unit. Exemplarily, the body failure includes any one or more of: downlink communication failure of the upper layer control unit, abnormal heartbeat signal of the upper layer control unit, all power supply failures of the layer control unit or uplink communication failure of the lower layer control unit. The lower-layer control unit upload fault means that the fault type detected by the lower-layer control unit in the main body fault is uploaded to the control unit of this layer, or a control unit of a certain layer receives the fault uploaded by the lower-layer control unit.

Exemplarily, the body failure may be a failure of any layer of control units in the valve base control device, such as a downlink communication failure of the upper layer control unit, that is, the faulty layer of control unit cannot receive the signal sent by the upper layer control unit. ; All power supplies of the control units at this layer are faulty, that is, the power supply of the control unit chassis at the faulty layer is faulty. The uplink communication of the lower layer control unit is faulty, that is, the faulty first layer control unit cannot receive the upload signal of the lower layer control unit.

In an optional embodiment, when the valve-base control device detects that the failure of the valve-base control device is a downlink communication failure of the upper-layer control unit, the method further includes: according to the sequence of the last normal communication before the failure occurs, Generate the control sequence start signal required by the control unit of this layer.

In this embodiment, when the failure of the valve base control device is that a certain layer of control unit receives the upper layer communication failure (that is, the downlink communication failure of the upper layer control unit), the layer control unit generates a control sequence start signal by itself, and realizes the communication with the upper layer. The control cycle of the control unit is relatively synchronized, and guides the control unit of this layer to control the sequence. In order to ensure that the distributed protection action command of the control unit of this layer is sent to the control unit of the lower layer, and the fault information of the control unit of the layer can be sent to the control unit of the upper layer. Wherein, the upper-level control unit can be a pole control protection system, an upper-level control unit or a middle-level control unit.

In an optional embodiment, the converter valve exit operation signal is used to inform the converter valve sub-module to no longer execute the switching instruction issued by the valve base control device, and to bypass the execution sub-module when the downlink communication of the valve base control device fails. Function masking.

In this embodiment, if the valve base control device fails for a long time, the converter valve can be sent out of operation signal, so as to avoid large-area bypass of the converter valve sub-module.

In an optional embodiment, the valve-based control device may include multiple layers of control units (such as at least two layers of control units), and the first preset time and the second preset time for each layer of control units to fail are different, That is to say, the value of the distributed protection action time of different layer control units is different. Specifically, it can be based on the communication delay of sending the fault to the upper layer control unit after the layer control unit monitors the fault state, the upper layer control unit executing the distributed protection action delay, protection Design the communication delay of actions sent to other control units in this layer.

In an optional embodiment, after the valve base control device detects that the failure of the valve base control device is recovered, the valve base control device generates and outputs an unlocking instruction and an enabling signal according to the latest command issued by the upper-level control unit, canceling the distribution. type protection action, so that the converter valve sub-module can work according to the latest command issued by the upper control unit.

The following is an example of the valve base control device having a two-layer structure and a three-layer structure to describe the specific protection actions when the valve base control device fails.

When the valve base control equipment is divided into 2-layer structure design, as shown in Figure 2, they are respectively recorded as the uppermost control unit and the lowermost control unit; among them, the uppermost control unit is connected to the upper pole control and protection system, and the lowermost is connected to the most control unit. The lower layer control unit, the lowermost layer control unit is connected to the uppermost layer control unit, and the lower layer is connected to the converter valve. The specific fault protection method is analyzed according to the failure of the uppermost and lowermost control units respectively.

(1) If the uppermost control unit of the VBC detects the main body failure or receives an upload failure from the lowermost control unit.

If the fault type is the communication fault of the receiving pole control and protection system, the uppermost control unit will generate the control sequence start signal by itself to achieve relative synchronization with the control cycle of the pole control protection (PCP, Pole Control and Protect) system, and guide the control unit to all control timing.

If the fault duration exceeds the first preset time T _M , that is, when T ₁ = T _M , and the PCP does not issue a blocking instruction, the uppermost control unit issues an autonomous blocking instruction (or blocking commutation) to each lowermost control unit valve signal), and send the fault to PCP;

If the fault duration exceeds the second preset time T _N , that is, when T ₂ =T _N (T _N >T _M ), the uppermost control unit automatically generates a converter valve exit signal and sends it to the lowermost layer control unit.

(2) If the VBC lowermost control unit detects the main body failure.

If the fault type is the communication failure of the uppermost control unit of the receiving valve base control device, the lowermost control unit of the VBC will generate the control sequence start signal by itself, so as to achieve relative synchronization with the control cycle of the uppermost control unit of the VBC, and guide all the control sequences of the control unit. .

If the fault duration exceeds the first preset time, that is, when T ₃ =T _M +ΔT, and the blocking instruction issued by the uppermost control unit is not received, the lowermost control unit will issue an autonomous command to the connected sub-module. Block the command (or block the converter valve signal), and send the fault to the uppermost control unit;

If the fault duration exceeds the second preset time, that is, when T ₄ =T _N +ΔT, the lowermost control unit autonomously generates the converter valve out of operation signal, and sends it to the connected sub-module.

(3) T _M , T _N , and ΔT are designed according to the time when the upper-level equipment's blocking and converter valve shutdown instructions are sent to other valve-based control equipment with normal communication within the corresponding time.

When the valve base control equipment is divided into a 3-layer structure design, as shown in Figure 3, they are respectively recorded as the uppermost control unit, the middle layer control unit and the lowermost control unit; among them, the uppermost control unit is connected to the PCP system, and the The bottom is connected to the middle layer control unit, the lowermost layer control unit is connected to the middle layer control unit to the top, and the lower layer is connected to the converter valve, and the middle layer control unit is an intermediate hub. For the specific fault protection method, the analysis is carried out according to the failure of the uppermost, middle and lowermost control units respectively.

(1) If the uppermost control unit of the VBC detects a main body failure or receives an upload failure from the lowermost control unit.

If the fault type is a receiving PCP communication fault, the uppermost control unit of the VBC generates a control sequence start signal by itself to achieve relative synchronization with the PCP control cycle, and guide the control unit to all control the sequence.

If the fault duration exceeds the first preset time T _M , that is, when T ₁ =T _M , and the PCP does not issue a blocking command, the uppermost control unit issues an autonomous blocking command (or blocking commutation) to each middle-level control unit valve signal), and send the fault to PCP;

If the fault duration exceeds the second preset time T _N , that is, when T ₂ =T _N (T _N >T _M ), the uppermost control unit automatically generates a converter valve exit signal and sends it to the middle layer control unit.

(2) If the VBC middle layer control unit detects the main body failure or the lowermost layer control unit upload failure.

If the failure type is the communication failure of the uppermost control unit of the VBC, the VBC middle-level control unit will generate the control sequence start signal by itself to achieve relative synchronization with the control cycle of the VBC uppermost control unit, and guide the control unit to all control the sequence.

If the fault duration exceeds the first preset time, that is, when T ₃ =T _M +ΔT, and the blocking instruction issued by the uppermost control unit is not received, the intermediate control unit will issue an autonomous blocking to each lowermost control unit command (or block the converter valve signal), and send the fault to the uppermost control unit;

If the fault duration exceeds the second preset time, that is, when T ₄ =T _N +ΔT, the middle layer control unit autonomously generates a converter valve out of operation signal, and sends it to the lowermost layer control unit.

(3) If the VBC lowermost control unit detects the main body failure.

If the failure type is to receive the communication failure of the VBC middle layer control unit, then the VBC lowermost layer control unit generates the control sequence start signal by itself, realizes the relative synchronization with the control cycle of the VBC middle layer control unit, and guides the control unit to all control the sequence.

If the fault duration exceeds the first preset time, that is, when T ₅ =T _M +2*ΔT, and the blocking instruction issued by the middle-level control unit is not received, the lowermost-level control unit will download the Send the main blocking command (or block the converter valve signal), and send the fault to the middle layer control unit;

If the fault duration exceeds the second preset time, that is, when T ₆ =T _N +2*ΔT, the lowermost control unit autonomously generates the converter valve out of operation signal and sends it to the connected sub-modules.

(4) T _M , T _N , and ΔT are designed according to the time when the upper-level equipment's blocking and converter valve shutdown instructions are issued to other valve-based control equipment with normal communication within the corresponding time.

The valve base control and protection method provided by the embodiments of the present application ensures that the VBC can protect the valve base when the hardware equipment of the pole control protection system or each control unit of the valve base control device fails without additional physical connection between the control units of the valve base control device. Control the converter valve to smoothly transition to the locked and outage state to ensure that the converter valve is in a controlled state throughout the process, thereby effectively improving the reliability of the converter valve operation; according to the location of the fault, each control unit of the valve-based control equipment protects The timing of the exits is also different to ensure that protection actions work effectively with other system-level protection exits.

In an exemplary embodiment, the valve-based control device may be implemented by one or more Application Specific Integrated Circuit (ASIC, Application Specific Integrated Circuit), Digital Signal Processor (DSP, Digital Signal Processor), Programmable Logic Device (PLD, Programmable Logic Device (PLD) Logic Device), Complex Programmable Logic Device (CPLD, Complex Programmable Logic Device), Field Programmable Gate Array (FPGA, Field-Programmable Gate Array), General Purpose Processor, Controller, Microcontroller (MCU, Micro Controller Unit) , a microprocessor (Microprocessor), or other electronic components to implement the aforementioned method.

In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict with each other.

Although the exemplary embodiments and their advantages have been described in detail, those skilled in the art can make various changes, substitutions and alterations in these embodiments without departing from the spirit of the present application and the scope of protection defined by the appended claims, Such modifications and variations are within the scope defined by the appended claims. For other examples, those of ordinary skill in the art will readily understand that the order of the process steps can be varied while remaining within the scope of the present application.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by program instructions related to hardware, the aforementioned program can be stored in a computer-readable storage medium, and when the program is executed, execute Including the steps of the above method embodiment; and the aforementioned storage medium includes: a mobile storage device, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk and other various A medium on which program code can be stored.

In addition, the scope of application of the present application is not limited to the process, mechanism, manufacture, material composition, means, method and steps of the specific embodiments described in the specification. From the disclosure of the present application, as those of ordinary skill in the art, it will be easily understood by those of ordinary skill in the art that there are currently existing or will be developed in the future for the process, mechanism, manufacture, composition of matter, means, method or step, wherein they perform the same as the present application. Corresponding embodiments described that perform substantially the same function or achieve substantially the same results can be applied in accordance with the present application. Accordingly, the appended claims of this application are intended to include within their scope such processes, mechanisms, manufacture, compositions of matter, means, methods or steps.

Claims

A valve base control and protection method, comprising:

When the valve base control device detects that the valve base control device is faulty, it starts timing and generates the fault duration;

When the fault duration exceeds the first preset time and the blocking instruction issued by the upper-layer control unit is not received, the valve base control device generates and outputs a blocking converter valve signal;

When the fault duration exceeds a second preset time, the valve base control device generates and outputs a signal that the converter valve is out of operation; the second preset time is greater than the first preset time.
The valve base control and protection method according to claim 1, wherein the valve base control device comprises: at least one layer of control units.
The valve base control and protection method according to claim 1, wherein the failure of the valve base control device comprises: a main body failure and/or an upload failure of a lower layer control unit.
The valve base control and protection method according to claim 3, wherein the main body failure comprises: downlink communication failure of the upper layer control unit, abnormal heartbeat signal of the upper layer control unit, all power supply failure of the layer control unit or uplink communication of the lower layer control unit any one or more of the faults.
The valve base control and protection method according to claim 4, wherein when the valve base control device detects that the failure of the valve base control device is a downlink communication failure of the upper control unit, the method further comprises:

According to the sequence of the last normal communication before the fault occurs, the control sequence start signal required by the control unit of this layer is generated.
The valve base control and protection method according to claim 1, wherein the converter valve exiting operation signal is used to inform the converter valve sub-module to no longer execute the switching instruction issued by the valve base control device, and the When the downlink communication of the valve base control equipment fails, the sub-module bypass function is shielded.
The valve base control and protection method according to claim 2, wherein, when different layers of control units in the valve base control device fail, the values of the first preset time and the second preset time are different from each other. same.
The valve base control and protection method according to claim 1, wherein the method further comprises:

After the valve base control device detects that the valve base control device has recovered from the fault, the valve base control device generates and outputs an unlocking instruction and an enable signal according to the latest command issued by the upper-layer control unit.
A valve base control device, comprising: a processor and a memory for storing a computer program that can be run on the processor, wherein the processor is used to execute any one of claims 1 to 8 when running the computer program the steps of the method.
A computer-readable storage medium having a computer program stored thereon, the computer program implementing the steps of the method according to any one of claims 1 to 8 when the computer program is executed by a processor.