CN117335578B - Detection and regulation system for loop closing power conversion of low-voltage power distribution - Google Patents

Abstract

The invention provides a loop closing power conversion detection and regulation system for low-voltage power distribution, which comprises: the fault detection module is used for collecting the state information of the first path of power supply unit and the state information of the second path of power supply unit; the power conversion judging module is used for judging whether power conversion is needed or not; the data acquisition module is used for acquiring ring closing related information of the first path of power supply bus and ring closing related information of the second path of power supply bus; the loop closing pre-judging module is used for determining loop closing state information based on the loop closing related information of the first path of power supply bus and the loop closing related information of the second path of power supply bus when the power transfer judging module judges that power transfer is needed, and judging whether a preset loop closing requirement set is met or not; the ring closing executing module is used for controlling the ring closing unit to complete ring closing operation when the ring closing pre-judging module judges that the ring closing state information meets the preset ring closing requirement set, and controlling the ring closing unit to complete ring opening operation when the fault is relieved, and has the advantage of improving the reliability of power supply.

Description

Detection and regulation system for loop closing power conversion of low-voltage power distribution

Technical Field

The invention relates to the field of power supply systems, in particular to a loop closing power conversion detection and regulation system for low-voltage power distribution.

Background

With the development of a power grid and the improvement of the requirements of society on power supply reliability, the structure of a power distribution network is more and more complex, and the situation of double-power supply and even multiple-power supply is more and more. In order to ensure the operation reliability of the power distribution network, the power distribution cabinet generally adopts two paths of power supply buses to supply power, and each path of power supply bus carries a corresponding power load so as to prevent one path of power supply line from faults and ensure the normal power supply of the power distribution network. In general, two paths of power supply buses are operated in a split mode, but in special cases, the two paths of power supply buses are required to be mutually communicated, and ring closing operation is required to connect the two paths of power supply buses together for parallel operation, so that the realization of uninterrupted power supply and load reversing through ring closing and ring opening operations becomes a necessary trend. The power supply system has the advantages that the power failure times of users can be reduced, the reliability of power supply is greatly improved, and the satisfaction degree of the public to power supply is improved.

In the prior art, the loop closing operation is judged by a power distribution worker after a fault occurs, and the loop closing operation is directly performed on the bus-bar circuit breaker, so that the bus-bar circuit breaker can connect two paths of power supply buses together to operate in parallel. However, there is a risk of failure in parallel operation of the two sections of buses by adopting a mode of manually directly connecting the ring bus-bar circuit breaker, and if the voltage difference or the phase angle difference between the two power supply buses is too large, the ring-closing current may be too large, and the ring-closing failure is caused by tripping of the ring-bar circuit breaker.

Therefore, it is desirable to provide a loop closing power transfer detection and control system for low voltage power distribution for improving the reliability of power supply.

Disclosure of Invention

One of the embodiments of the present disclosure provides a detection and regulation system for loop closing and power conversion of low-voltage power distribution, which is applied to a dual-path power supply system, wherein the dual-path power supply device includes a first path power supply unit, a first path power supply bus, a second path power supply unit, a second path power supply bus and a loop closing unit, and is characterized in that the system includes: the fault detection module comprises a first path of detection unit and a second path of detection unit, wherein the first path of detection unit is used for acquiring state information of the first path of power supply unit, and the second path of detection unit is used for acquiring state information of the second path of power supply unit; the power conversion judging module is used for judging whether power conversion is needed or not based on the state information of the first path of power supply unit and/or the state information of the second path of power supply unit, and determining fault path power supply units in the first path of power supply unit and the second path of power supply unit when judging that power conversion is needed; the data acquisition module is used for acquiring the loop closing related information of the first path of power supply bus and the loop closing related information of the second path of power supply bus; the loop closing pre-judging module is used for determining loop closing state information based on the loop closing related information of the first path of power supply bus and the loop closing related information of the second path of power supply bus when the power conversion judging module judges that power conversion is needed, and judging whether the loop closing state information meets a preset loop closing requirement set or not; and the loop closing execution module is used for controlling the loop closing unit to complete loop closing operation when the loop closing pre-judging module judges that the loop closing state information meets a preset loop closing requirement set, and also used for controlling the loop closing unit to complete loop opening operation when the fault of the fault circuit power supply unit is relieved.

In some embodiments, the first path detection unit includes a plurality of electrical detection components, a plurality of environment detection components, a plurality of vibration detection components, a plurality of sound collection components, a plurality of ultrasonic detection components and a detection control component, wherein the plurality of electrical detection components are respectively installed at different positions of a transformer of the first path power supply unit, the plurality of environment detection components are respectively installed at different positions of the transformer of the first path power supply unit, the plurality of vibration detection components are respectively installed at different positions of the transformer of the first path power supply unit, the plurality of sound collection components are respectively installed at different positions of the transformer of the first path power supply unit, the plurality of ultrasonic detection components are respectively installed at different positions of the transformer of the first path power supply unit, the plurality of electrical detection components are used for collecting a-phase current, B-phase current, C-phase current, a-phase voltage, B-phase voltage and C-phase voltage of the plurality of components of the transformer, the plurality of environment detection components are respectively used for collecting temperature information and humidity information at different positions of the transformer inside the transformer, the plurality of ultrasonic detection components are respectively used for collecting information of the vibration information of the transformer inside the plurality of the transformer; the plurality of electric detection components, the plurality of environment detection components, the plurality of vibration detection components, the plurality of sound collection components and the plurality of ultrasonic detection components are all electrically connected with the detection control component.

In some embodiments, the first path detection unit collects state information of the first path power supply unit, including: the detection control component establishes a detection component map based on the correlation among the plurality of electrical detection components, the plurality of environment detection components, the plurality of vibration detection components, the plurality of sound collection components and the plurality of ultrasonic detection components, wherein the detection component map is used for representing the association relation among the plurality of electrical detection components, the plurality of environment detection components, the plurality of vibration detection components, the plurality of sound collection components and the plurality of ultrasonic detection components; the detection control component judges whether ultrasonic detection is performed or not based on output data of the plurality of electric detection components, the plurality of environment detection components, the plurality of vibration detection components and the plurality of sound acquisition components and the detection component map; when judging to perform ultrasonic detection, the detection control component determines at least one target ultrasonic detection component from the plurality of ultrasonic detection components based on output data of the plurality of electric detection components, the plurality of environment detection components, the plurality of vibration detection components and the plurality of sound acquisition components and the detection component map, generates a target detection pose corresponding to each target ultrasonic detection component, controls the target ultrasonic detection components to adjust to the corresponding target detection poses, and acquires ultrasonic information inside the transformer under the target detection poses.

In some embodiments, the power conversion determining module determines, based on the state information of the first path of power supply unit, whether power conversion is needed, including: when the detection control assembly judges that ultrasonic detection is carried out, determining a first fault possibility of the transformer based on output data of the plurality of electric detection assemblies, the plurality of environment detection assemblies, the plurality of vibration detection assemblies and the plurality of sound acquisition assemblies, the detection assembly map and ultrasonic information in the transformer acquired by each target ultrasonic detection assembly; when the detection control component judges that ultrasonic detection is not performed, determining a second fault possibility of the transformer based on output data of the plurality of electric detection components, the plurality of environment detection components, the plurality of vibration detection components and the plurality of sound acquisition components and the detection component map; and when the first fault possibility of the transformer or the second fault possibility of the transformer is larger than a preset first fault possibility threshold value, judging that the first path of power supply unit needs to perform power conversion.

In some embodiments, the preset first failure likelihood threshold is determined based on a characteristic of a load of the first way supply bus.

In some embodiments, the loop closing related information of the first path power supply bus includes at least a first current, a first voltage amplitude, a first phase angle, and a first frequency: the loop closing related information of the second path power supply bus at least comprises a second current, a second voltage amplitude, a second phase angle and a second frequency.

In some embodiments, the loop closing prediction module determines loop closing state information based on the loop closing related information of the first path of power supply bus and the loop closing related information of the second path of power supply bus, including: determining a voltage difference, a phase angle difference, and a frequency difference based on the first current, the first voltage magnitude, the first phase angle, and the first frequency and the second current, the second voltage magnitude, the second phase angle, and the second frequency; and predicting steady-state current and transient-state current after loop closing based on the topological structure of the first path power supply unit, the topological structure of the second path power supply unit, the load characteristics of the first path power supply bus and the load characteristics of the second path power supply unit, wherein the loop closing state information at least comprises the voltage difference, the phase angle difference and the frequency difference.

In some embodiments, the loop closing pre-determination module determines whether the loop closing state information meets a preset loop closing requirement set, including: calculating a differential pressure based on the voltage difference and the phase angle difference, and judging whether the differential pressure meets a preset differential pressure condition; judging whether the phase difference meets a preset phase difference condition or not; judging whether the frequency difference meets a preset frequency difference condition or not; judging whether the steady-state current and the transient current meet the preset loop closing stability requirement or not.

In some embodiments, the closed loop pre-determination module calculates the pressure differential by:wherein (1)>Is differential pressure, +.>First voltage amplitude for the t-th period, < >>Is the phase angle difference>Second voltage amplitude for the t-th period, < >>Is the total number of cycles.

In some embodiments, the loop closing unit includes a first execution switch, a second execution switch, and a third execution switch, where the first execution switch is connected in series between the first path of power supply unit and the first path of power supply bus, the second execution switch is connected in series between the second path of power supply unit and the second path of power supply bus, and the third execution switch is connected in series between the first path of power supply bus and the second path of power supply bus; the loop closing execution module controls the loop closing unit to complete loop closing operation, and the loop closing execution module comprises: when the first path of power supply unit is the fault path of power supply unit, the first executing switch is in an off state, and the second executing switch and the third executing switch are controlled to be in an on state; when the second path power supply unit is the fault path power supply unit, the second execution switch is in an open state, and the first execution switch and the third execution switch are controlled to be in a closed state; the loop closing execution module controls the loop closing unit to complete loop opening operation, and the loop closing execution module comprises: and controlling the first executing switch and the second executing switch to be in a closed state, and controlling the third executing switch to be in an open state.

Compared with the prior art, the detection and regulation system for loop closing power conversion of low-voltage power distribution provided by the specification has the following beneficial effects:

1. the method comprises the steps that through acquiring state information of a first path of power supply unit and state information of a second path of power supply unit, real-time monitoring of states of the first path of power supply unit and the second path of power supply unit is achieved, when the first path of power supply unit or the second path of power supply unit breaks down, whether the first path of power supply bus and the second path of power supply bus can perform loop closing operation or not is automatically judged according to loop closing related information of the first path of power supply bus and loop closing related information of the second path of power supply bus, when the loop closing operation is judged to be possible, the loop closing unit is automatically controlled to complete the loop closing operation, power supply of a load is guaranteed, and when the fault is relieved, the loop closing unit is controlled to automatically complete loop closing operation without relying on manpower for operation, loop closing and switching automation is achieved, and power supply reliability is improved;

2. the multi-dimensional data acquisition is realized by arranging a plurality of electric detection assemblies, a plurality of environment detection assemblies, a plurality of vibration detection assemblies, a plurality of sound acquisition assemblies and a plurality of ultrasonic detection assemblies, so that the states of the first path of power supply unit and the second path of power supply unit can be more accurately determined;

3. By judging whether the differential pressure meets the preset differential pressure condition, whether the phase difference meets the preset phase difference condition, whether the frequency difference meets the preset frequency difference condition, the steady-state current and whether the transient current meets the preset loop closing stability requirement, the loop closing operation of the first power supply bus and the second power supply bus is judged more comprehensively and automatically, and the reliability of the loop closing operation and power supply is further improved.

Drawings

The present specification will be further elucidated by way of example embodiments, which will be described in detail by means of the accompanying drawings. The embodiments are not limiting, in which like numerals represent like structures, wherein:

FIG. 1 is a schematic block diagram of a loop-closing switching detection and regulation system for low voltage power distribution according to some embodiments of the present disclosure;

FIG. 2 is a schematic structural view of a ring closing unit according to some embodiments of the present disclosure;

fig. 3 is a schematic diagram of a first path detection unit according to some embodiments of the present disclosure.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present specification, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some examples or embodiments of the present specification, and it is possible for those of ordinary skill in the art to apply the present specification to other similar situations according to the drawings without inventive effort. Unless otherwise apparent from the context of the language or otherwise specified, like reference numerals in the figures refer to like structures or operations.

It will be appreciated that "system," "apparatus," "unit" and/or "module" as used herein is one method for distinguishing between different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

As used in this specification and the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.

A flowchart is used in this specification to describe the operations performed by the system according to embodiments of the present specification. It should be appreciated that the preceding or following operations are not necessarily performed in order precisely. Rather, the steps may be processed in reverse order or simultaneously. Also, other operations may be added to or removed from these processes.

The loop closing power conversion detection and regulation system for low-voltage power distribution can be applied to a two-way power supply system, wherein the two-way power supply device comprises a first power supply unit, a first power supply bus, a second power supply unit, a second power supply bus and a loop closing unit. The first power supply unit and the second power supply unit may have the same structure, and the first power supply unit is taken as an example for explanation. The first path power supply unit may include: the transformer is used for converting high-voltage electric energy into low-voltage electric energy; the low-voltage power distribution cabinet is used for centrally controlling and protecting low-voltage electrical equipment; cables and wires for transmitting electrical energy in a low voltage distribution system; electrical protection devices, such as fuses, circuit breakers, overload relays, earth leakage protectors, etc., for protecting electrical devices and lines from faults such as overload, short circuits, earth leakage, etc.; metering devices, such as electric energy meters, voltmeters, ammeter, etc., for monitoring and recording the operating status and power consumption of the low voltage distribution system; the grounding system comprises a grounding electrode, a grounding conductor and the like, and is used for protecting personal safety and equipment safety and ensuring normal operation of the system; switching devices, such as isolating switches, load switches, etc., for switching off or on the circuit, effecting control and protection of the device; and the distribution box is used for distributing electric energy to each electric equipment. Protection and control elements, such as fuses, circuit breakers, etc., are typically contained within the electrical distribution box.

Fig. 2 is a schematic structural diagram of a loop closing unit according to some embodiments of the present disclosure, as shown in fig. 2, in some embodiments, the loop closing unit includes a first executing switch, a second executing switch and a third executing switch, where the first executing switch is connected in series between a first power supply unit and a first power supply bus, the second executing switch is connected in series between a second power supply unit and a second power supply bus, and the third executing switch is connected in series between the first power supply bus and the second power supply bus.

Fig. 1 is a schematic block diagram of a detection and control system for loop closing switching of low-voltage power distribution according to some embodiments of the present disclosure, and as shown in fig. 1, a detection and control system for loop closing switching of low-voltage power distribution may include a fault detection module, a switching determination module, a data acquisition module, a loop closing pre-determination module, and a loop closing execution module.

The fault detection module may include a first path detection unit and a second path detection unit, where the first path detection unit is configured to collect state information of the first path power supply unit, and the second path detection unit is configured to collect state information of the second path power supply unit.

The first path detecting unit and the second path detecting unit may have the same structure, and the first path detecting unit is taken as an example for explanation.

Fig. 3 is a schematic diagram of a first path detection unit according to some embodiments of the present disclosure, as shown in fig. 3, in some embodiments, the first path detection unit includes a plurality of electrical detection components, a plurality of environment detection components, a plurality of vibration detection components, a plurality of sound collection components, a plurality of ultrasonic detection components, and a detection control component, the plurality of electrical detection components are respectively installed at different positions of a transformer of the first path power supply unit, the plurality of environment detection components are respectively installed at different positions of the transformer of the first path power supply unit, the plurality of vibration detection components are respectively installed at different positions of the transformer of the first path power supply unit, the plurality of sound collection components are respectively installed at different positions of the transformer of the first path power supply unit, wherein the plurality of electrical detection components are used for collecting a-phase current, B-phase current, C-phase current, a-phase voltage, B-phase voltage, and C-phase voltage of the plurality of components of the transformer, the plurality of environment detection components are respectively used for collecting temperature information and humidity information of the inside the transformer, the plurality of vibration detection components are respectively used for collecting temperature information and humidity information of the inside the transformer, and the plurality of vibration detection components are respectively used for collecting humidity information of the transformer.

Specifically, the historical fault information of a plurality of sample transformers of the same type as the transformers of the first path of power supply unit may be obtained first, and the components (may also be referred to as "first candidate components") of which the fault occurrence frequency is greater than the first preset fault occurrence frequency threshold value and the abnormal characteristics (such as current abnormality, voltage abnormality, temperature abnormality, sound abnormality, vibration abnormality, etc.) of the components when the faults occur in the transformers of the type may be determined, so as to determine the installation positions of a plurality of electrical detection components, a plurality of environment detection components, a plurality of vibration detection components and a plurality of sound collection components. For example, the abnormal characteristics exhibited when the first candidate component a fails include a current abnormality, a voltage abnormality, a temperature abnormality, a group of electrical detection components and a group of environmental detection components may be provided thereto, and the abnormal characteristics exhibited when the first candidate component B fails include a vibration abnormality and a sound abnormality, a group of vibration detection components and a group of sound collection components may be provided thereto.

Further, when it is determined that a fault occurs, the abnormal feature includes a candidate component (may also be referred to as a "second candidate component") that is abnormal in ultrasonic wave, the second candidate components whose frequency of occurrence of the fault is greater than a second preset frequency threshold value of occurrence of the fault are taken as target candidate components, each of the target candidate components is taken as a clustering center, the plurality of second candidate components are clustered based on a distance between any two of the second candidate components, and a plurality of first component cluster clusters are determined, for example, for a target candidate component a, the second candidate components whose distance from the target candidate component a is less than a preset distance threshold value may be clustered to the first component cluster with the target candidate component a as a clustering center. When a certain second candidate component and at least two target candidate components are less than a preset distance threshold, clustering the second candidate component to a first component cluster taking the target candidate component with the lowest occurrence frequency of faults as a cluster center.

Further, for each first component cluster, the average failure occurrence frequency and the failure occurrence fluctuation coefficient of the first component cluster can be determined based on the failure occurrence frequency of each second candidate component included in the first component cluster, so as to calculate the splitting score of the first component cluster. And taking the first component cluster with the splitting score larger than the preset splitting score threshold value as the target component cluster. And for each target component cluster, taking a second candidate component with the failure occurrence frequency inferior to that of the cluster center of the target component cluster in the target component cluster as a newly added cluster center, clustering the target component cluster again by referring to the flow, and dividing the target component cluster into two second component clusters.

And for each second component cluster, determining the average fault occurrence frequency and the fault occurrence fluctuation coefficient of the second component cluster, and further calculating the splitting score of the second component cluster. And taking a second cluster with the splitting score larger than a preset splitting score threshold as a target component cluster, and repeating the process until the average fault occurrence frequency of each finally determined component cluster is smaller than or equal to a preset average fault occurrence frequency threshold.

For example only, the split score for the first component cluster may be calculated based on the following formula:

wherein,splitting score for the ith first component cluster,/-for the first component cluster>、/>Are all preset weights, are->、Are all preset parameters, and are->For the average failure occurrence frequency of the ith first component cluster,for presetting standard average fault occurrence frequency, +.>Fluctuation coefficient for failure occurrence of ith first component cluster, +.>The coefficient of fluctuation occurs for a preset standard fault,and (2) for the failure occurrence frequency of the nth second candidate component in the ith first component cluster, wherein N is the total number of the second candidate components included in the first component cluster.

It will be appreciated that a corresponding set of ultrasonic detection components may be provided for each cluster of components that is ultimately determined.

The plurality of electrical detection components, the plurality of environment detection components, the plurality of vibration detection components, the plurality of sound collection components and the plurality of ultrasonic detection components are all electrically connected with the detection control component. The detection control components may include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various computing units running machine learning model algorithms, a Digital Signal Processor (DSP), as well as any suitable processor, controller, microcontroller, etc.

In some embodiments, the first path detection unit collects state information of the first path power supply unit, including:

the detection control assembly establishes a detection assembly map based on the correlation among the plurality of electrical detection assemblies, the plurality of environment detection assemblies, the plurality of vibration detection assemblies, the plurality of sound collection assemblies and the plurality of ultrasonic detection assemblies, wherein the detection assembly map is used for representing the association relationship among the plurality of electrical detection assemblies, the plurality of environment detection assemblies, the plurality of vibration detection assemblies, the plurality of sound collection assemblies and the plurality of ultrasonic detection assemblies;

the detection control component judges whether to perform ultrasonic detection or not based on output data of the plurality of electric detection components, the plurality of environment detection components, the plurality of vibration detection components and the plurality of sound acquisition components and detection component patterns;

when judging to carry out ultrasonic detection, the detection control component determines at least one target ultrasonic detection component from the plurality of ultrasonic detection components based on output data of the plurality of electric detection components, the plurality of environment detection components, the plurality of vibration detection components and the plurality of sound acquisition components and a detection component map, generates a target detection pose corresponding to each target ultrasonic detection component, controls the target ultrasonic detection component to adjust to the corresponding target detection pose, and acquires ultrasonic information inside the transformer under the target detection pose.

Specifically, an electrical detection component, an environment detection component, a vibration detection component, a sound collection component and an ultrasonic detection component for detecting the same component are related, in a detection component map, the electrical detection component, the environment detection component, the vibration detection component, the sound collection component and the ultrasonic detection component which are related are connected through edges, and in the detection component map, a plurality of electrical detection components, a plurality of environment detection components, a plurality of vibration detection components, a plurality of sound collection components and a plurality of association relations between the ultrasonic detection components and the components can be recorded. It can be understood that, for each component, the ultrasonic detection component associated with that component is the ultrasonic detection component corresponding to the cluster of components to which that component belongs.

The detection control component may first control the plurality of electrical detection components, the plurality of environment detection components, the plurality of vibration detection components, and the plurality of sound collection components, collect data according to a preset first sampling frequency, and determine a component that may fail (may also be referred to as a "candidate failure component") according to the data collected by the plurality of electrical detection components, the plurality of environment detection components, the plurality of vibration detection components, and the plurality of sound collection components according to the preset first sampling frequency. It will be appreciated that when the detection control component determines that a component is abnormal in at least one aspect based on data collected by the plurality of electrical detection components, the plurality of environment detection components, the plurality of vibration detection components, and the plurality of sound collection components at a preset first sampling frequency, the component may be a candidate fault component, for example, when a voltage, a temperature, or vibration of the component is abnormal, the component may be a candidate fault component. For example only, a component may be considered a candidate faulty component when the voltage, temperature, or vibration of the component is greater than a corresponding preset threshold.

The detection control component can judge whether the candidate fault component is associated with the ultrasonic detection component according to the detection component map, and if the candidate fault component is associated with the ultrasonic detection component, ultrasonic detection is performed. The target ultrasonic detection component is the ultrasonic detection component of the component cluster to which the candidate fault component belongs. The target detection pose corresponding to the target ultrasonic detection assembly can be determined through a pose generation model based on the position information of the candidate fault assembly, the internal point cloud information of the transformer of the first path of power supply unit and a constraint condition set, wherein the constraint condition set can comprise the shortest distance between the target ultrasonic detection assembly and an obstacle, the motion range constraint of the target ultrasonic detection assembly and the like, and the pose generation model can generate an impedance network (Generative Adversarial Nets, GAN) model.

Further, according to the detection component map, determining an electrical detection component, an environment detection component, a vibration detection component and/or a sound collection component associated with the candidate fault component, wherein the detection control component can control the electrical detection component, the environment detection component, the vibration detection component and/or the sound collection component associated with the candidate fault component to collect data in a current detection period according to a preset second sampling frequency. Wherein the second sampling frequency is greater than the first sampling frequency.

The power conversion judging module can be used for judging whether power conversion is needed or not based on the state information of the first path of power supply unit and/or the state information of the second path of power supply unit, and determining the fault path of power supply units in the first path of power supply unit and the second path of power supply unit when the power conversion is needed.

The process of judging whether to transfer power based on the state information of the first path of power supply unit is consistent with the process of judging whether to transfer power based on the state information of the second path of power supply unit, and the following description will take the case of judging whether to transfer power based on the state information of the first path of power supply unit.

In some embodiments, the power conversion determining module determines, based on the state information of the first power supply unit, whether power conversion is needed, including:

when the detection control assembly judges that ultrasonic detection is carried out, determining the first fault possibility of the transformer based on output data of a plurality of electric detection assemblies, a plurality of environment detection assemblies, a plurality of vibration detection assemblies and a plurality of sound acquisition assemblies, a detection assembly map and ultrasonic information in the transformer acquired by each target ultrasonic detection assembly;

when the detection control component judges that ultrasonic detection is not performed, determining a second fault possibility of the transformer based on output data of the plurality of electric detection components, the plurality of environment detection components, the plurality of vibration detection components and the plurality of sound acquisition components and a detection component map;

When the first fault possibility of the transformer or the second fault possibility of the transformer is larger than a preset first fault possibility threshold value, judging that the first power supply unit needs to perform power conversion.

Specifically, the power conversion judging module may generate a feature matrix corresponding to the candidate fault component based on data acquired by the electrical detection component, the environment detection component, the vibration detection component and/or the sound acquisition component associated with the candidate fault component according to a preset second sampling frequency, where a row vector of the feature matrix represents data acquired by one of the electrical detection component, the environment detection component, the vibration detection component and/or the sound acquisition component in a current detection period according to the preset second sampling frequency.

For each first candidate component included in the transformer of the first path power supply unit, the power conversion judging module may pre-establish and train a fault judging model corresponding to each first candidate component. The fault judging model may be a machine learning model such as an artificial neural network (Artificial Neural Network, ANN) model, a cyclic neural network (Recurrent Neural Networks, RNN) model, a Long Short-Term Memory (LSTM) model, a bidirectional cyclic neural network (BRNN) model, etc.

When the detection control component judges that ultrasonic detection is carried out, the feature matrix corresponding to the candidate fault component and the target ultrasonic detection component corresponding to the candidate fault component collect ultrasonic data in the current detection period under the target detection pose, the ultrasonic data are input into a fault judgment model corresponding to the candidate fault component, the fault judgment model outputs the first component fault probability of the candidate fault component, and the first fault probability of the transformer is determined based on the first component fault probability of each candidate fault component.

When the detection control component judges that ultrasonic detection is not performed, the feature matrix corresponding to the candidate fault component is input to a fault judgment model corresponding to the candidate fault component, the fault judgment model outputs second component fault probability of the candidate fault component, and the second fault probability of the transformer is determined based on the second component fault probability of each candidate fault component.

For example only, the first failure probability of the transformer of the first path power supply unit may be calculated based on the following formula:

wherein,first failure possibility of the transformer of the first power supply unit,/for the first line>The first component failure probability of the R candidate failure component in the transformer of the first path power supply unit is given by R, which is the total number of candidate failure components in the transformer of the first path power supply unit,/the first component failure probability is given by R >Weight corresponding to fault judgment model corresponding to the r candidate fault component in the transformer of the first path of power supply unit is +.>For the average absolute error corresponding to the fault judgment model corresponding to the r candidate fault component in the transformer of the first path of power supply unit, < >>For the average square error corresponding to the fault judgment model corresponding to the r candidate fault component in the transformer of the first path of power supply unit, < >>The root mean square error corresponding to the fault judgment model corresponding to the r candidate fault component in the transformer of the first path of power supply unit is ∈>Mean absolute error corresponding to g fault judgment model corresponding to transformer of first path power supply unit, < >>For the average square error corresponding to the g-th fault judgment model corresponding to the transformer of the first power supply unit, < ->Root mean square error corresponding to g fault judgment model corresponding to transformer of first path power supply unit, +.>The total number of fault judgment models corresponding to the transformers of the first power supply unit is obtained.

In some embodiments, the preset first fault likelihood threshold is determined based on a characteristic of a load of the first way supply bus.

Specifically, the characteristics of the load of the first power supply bus may include the type of the load of the first power supply bus and the function of the load of the first power supply bus. For example, the types of loads of the first supply bus may include three types, wherein the first type of load: interruption of power generation can cause risk of personal injury or significant equipment damage and difficulty in repair, or cause significant political and economic losses. The second type of load: interruption of the power supply will lead to a large amount of waste, scrapping of a large amount of material, a large amount of production reduction, or major equipment damage accidents, but appropriate measures can be taken to avoid this. Third class of loads: all electric equipment not belonging to one class and two classes.

The power conversion judging module can determine the power failure tolerance of the load of the first path of power supply bus based on the type and the function of the load of the first path of power supply bus through a tolerance determining model, and adjust a preset first fault probability threshold based on the power failure tolerance of the load of the first path of power supply bus, wherein the tolerance determining model can be a machine learning model such as an artificial neural network (Artificial Neural Network, ANN) model, a cyclic neural network (Recurrent Neural Networks, RNN) model, a Long Short-Term Memory (LSTM) model, a bidirectional cyclic neural network (BRNN) model and the like. It can be appreciated that the lower the power outage tolerance of the load of the first path power bus, the lower the first fault likelihood threshold.

The data acquisition module can be used for acquiring the loop closing related information of the first path of power supply bus and the loop closing related information of the second path of power supply bus.

In some embodiments, the loop closing related information of the first path of power supply bus includes at least a first current, a first voltage amplitude, a first phase angle, and a first frequency. The loop closing related information of the second path power supply bus at least comprises a second current, a second voltage amplitude, a second phase angle and a second frequency.

The loop closing pre-judging module can be used for determining loop closing state information based on the loop closing related information of the first path of power supply bus and the loop closing related information of the second path of power supply bus when the power conversion judging module judges that power conversion is needed, and judging whether the loop closing state information meets a preset loop closing requirement set.

In some embodiments, the loop closing prediction module determines loop closing state information based on loop closing related information of the first path of power supply bus and loop closing related information of the second path of power supply bus, including:

determining a voltage difference, a phase angle difference, and a frequency difference based on the first current, the first voltage magnitude, the first phase angle, and the first and second currents, the second voltage magnitude, the second phase angle, and the second frequency;

based on the topological structure of the first path of power supply unit, the topological structure of the second path of power supply unit, the characteristics of the load of the first path of power supply bus and the characteristics of the load of the second path of power supply unit, predicting the steady-state current and the transient-state current after loop closing, wherein the loop closing state information at least comprises a voltage difference, a phase angle difference and a frequency difference.

In some embodiments, the loop closing pre-determination module determines whether the loop closing state information meets a preset loop closing requirement set, including:

Calculating a differential pressure based on the differential pressure and the phase angle difference, and judging whether the differential pressure meets a preset differential pressure condition, for example, the differential pressure is less than or equal to 5% of rated voltage;

judging whether the phase difference satisfies a preset phase difference condition, for example, the phase difference is 0;

judging whether the frequency difference meets the preset frequency difference condition, for example, the phase difference is 0;

judging whether the steady-state current and the transient-state current meet the preset loop closing stability requirement, for example, the steady-state current is preset steady-state current, the transient-state current is preset transient-state current and the like.

In some embodiments, the closed loop pre-determination module calculates the pressure differential by the following formula:

wherein,is differential pressure, +.>First voltage amplitude for the t-th period, < >>Is the phase angle difference>Second voltage amplitude for the t-th period, < >>Is the total number of cycles.

The loop closing execution module can be used for controlling the loop closing unit to complete loop closing operation when the loop closing pre-judging module judges that the loop closing state information meets a preset loop closing requirement set, and also used for controlling the loop closing unit to complete loop opening operation when the fault of the fault circuit power supply unit is relieved.

In some embodiments, the loop closing execution module controls the loop closing unit to complete a loop closing operation, including:

when the first path of power supply unit is a fault path of power supply unit, the first executing switch is in an open state, and the second executing switch and the third executing switch are controlled to be in a closed state;

When the second path power supply unit is a fault path power supply unit, the second execution switch is in an open state, and the first execution switch and the third execution switch are controlled to be in a closed state;

the loop closing execution module controls the loop closing unit to complete loop opening operation, and the loop closing execution module comprises:

the first executing switch and the second executing switch are controlled to be in a closed state, and the third executing switch is controlled to be in an open state.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements, and adaptations to the present disclosure may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within this specification, and therefore, such modifications, improvements, and modifications are intended to be included within the spirit and scope of the exemplary embodiments of the present invention.

Meanwhile, the specification uses specific words to describe the embodiments of the specification. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the present description. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the present description may be combined as suitable.

Furthermore, the order in which the elements and sequences are processed, the use of numerical letters, or other designations in the description are not intended to limit the order in which the processes and methods of the description are performed unless explicitly recited in the claims. While certain presently useful inventive embodiments have been discussed in the foregoing disclosure, by way of various examples, it is to be understood that such details are merely illustrative and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover all modifications and equivalent arrangements included within the spirit and scope of the embodiments of the present disclosure. For example, while the system components described above may be implemented by hardware devices, they may also be implemented solely by software solutions, such as installing the described system on an existing server or mobile device.

Likewise, it should be noted that in order to simplify the presentation disclosed in this specification and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are presented in the claims are required for the present description. Indeed, less than all of the features of a single embodiment disclosed above.

Finally, it should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments of this specification. Other variations are possible within the scope of this description. Thus, by way of example, and not limitation, alternative configurations of embodiments of the present specification may be considered as consistent with the teachings of the present specification. Accordingly, the embodiments of the present specification are not limited to only the embodiments explicitly described and depicted in the present specification.

Claims (7)

1. A detection and regulation and control system that closes ring transfer that is used for low voltage distribution is applied to double-circuit power supply system, wherein, double-circuit power supply system includes first power supply unit, first power supply busbar, second power supply unit, second power supply busbar and closes ring unit, its characterized in that includes:

the fault detection module comprises a first path of detection unit and a second path of detection unit, wherein the first path of detection unit is used for acquiring state information of the first path of power supply unit, and the second path of detection unit is used for acquiring state information of the second path of power supply unit;

the power conversion judging module is used for judging whether power conversion is needed or not based on the state information of the first path of power supply unit and/or the state information of the second path of power supply unit, and determining fault path power supply units in the first path of power supply unit and the second path of power supply unit when judging that power conversion is needed;

The data acquisition module is used for acquiring the loop closing related information of the first path of power supply bus and the loop closing related information of the second path of power supply bus;

the loop closing pre-judging module is used for determining loop closing state information based on the loop closing related information of the first path of power supply bus and the loop closing related information of the second path of power supply bus when the power conversion judging module judges that power conversion is needed, and judging whether the loop closing state information meets a preset loop closing requirement set or not;

the loop closing execution module is used for controlling the loop closing unit to complete loop closing operation when the loop closing pre-judging module judges that the loop closing state information meets a preset loop closing requirement set, and also used for controlling the loop closing unit to complete loop opening operation when the fault of the fault circuit power supply unit is relieved;

the first path of detection unit comprises a plurality of electric detection components, a plurality of environment detection components, a plurality of vibration detection components, a plurality of sound collection components, a plurality of ultrasonic detection components and a detection control component, wherein the plurality of electric detection components are respectively arranged at different positions of a transformer of the first path of power supply unit, the plurality of environment detection components are respectively arranged at different positions of the transformer of the first path of power supply unit, the plurality of vibration detection components are respectively arranged at different positions of the transformer of the first path of power supply unit, the plurality of sound collection components are respectively arranged at different positions of the transformer of the first path of power supply unit, the plurality of ultrasonic detection components are respectively arranged at different positions of the transformer of the first path of power supply unit, the plurality of electric detection components are used for collecting A-phase current, B-phase current, C-phase voltage, A-phase voltage and C-phase voltage of the plurality of electric detection components, the plurality of environment detection components are respectively used for collecting temperature information and humidity information at different positions inside the transformer, and the plurality of ultrasonic detection components are respectively used for collecting the temperature information and humidity information of the transformer;

The plurality of electrical detection assemblies, the plurality of environment detection assemblies, the plurality of vibration detection assemblies, the plurality of sound acquisition assemblies and the plurality of ultrasonic detection assemblies are electrically connected with the detection control assembly;

the first path of detection unit acquires state information of the first path of power supply unit, and the method comprises the following steps:

the detection control component establishes a detection component map based on the correlation among the plurality of electrical detection components, the plurality of environment detection components, the plurality of vibration detection components, the plurality of sound collection components and the plurality of ultrasonic detection components, wherein the detection component map is used for representing the association relation among the plurality of electrical detection components, the plurality of environment detection components, the plurality of vibration detection components, the plurality of sound collection components and the plurality of ultrasonic detection components;

the detection control component judges whether ultrasonic detection is performed or not based on output data of the plurality of electric detection components, the plurality of environment detection components, the plurality of vibration detection components and the plurality of sound acquisition components and the detection component map;

when judging to perform ultrasonic detection, the detection control component determines at least one target ultrasonic detection component from the plurality of ultrasonic detection components based on output data of the plurality of electric detection components, the plurality of environment detection components, the plurality of vibration detection components and the plurality of sound acquisition components and the detection component map, generates a target detection pose corresponding to each target ultrasonic detection component, controls the target ultrasonic detection component to adjust to the corresponding target detection pose, and acquires ultrasonic information inside the transformer under the target detection pose;

The power conversion judging module judges whether power conversion is needed or not based on the state information of the first path of power supply unit, and comprises the following steps:

when the detection control assembly judges that ultrasonic detection is carried out, determining a first fault possibility of the transformer based on output data of the plurality of electric detection assemblies, the plurality of environment detection assemblies, the plurality of vibration detection assemblies and the plurality of sound acquisition assemblies, the detection assembly map and ultrasonic information in the transformer acquired by each target ultrasonic detection assembly;

when the detection control component judges that ultrasonic detection is not performed, determining a second fault possibility of the transformer based on output data of the plurality of electric detection components, the plurality of environment detection components, the plurality of vibration detection components and the plurality of sound acquisition components and the detection component map;

and when the first fault possibility of the transformer or the second fault possibility of the transformer is larger than a preset first fault possibility threshold value, judging that the first path of power supply unit needs to perform power conversion.

2. The system for detecting and regulating loop closing transfer for low voltage power distribution according to claim 1, wherein the preset first fault likelihood threshold is determined based on characteristics of the load of the first path power bus.

3. The system for detecting and controlling loop closing switching power for low-voltage power distribution according to claim 1 or 2, wherein the loop closing related information of the first power supply bus at least comprises a first current, a first voltage amplitude, a first phase angle and a first frequency:

the loop closing related information of the second path power supply bus at least comprises a second current, a second voltage amplitude, a second phase angle and a second frequency.

4. The system for detecting and controlling loop closing power conversion for low-voltage power distribution according to claim 3, wherein the loop closing pre-judging module determines loop closing state information based on the loop closing related information of the first path power supply bus and the loop closing related information of the second path power supply bus, and comprises:

determining a voltage difference, a phase angle difference, and a frequency difference based on the first current, the first voltage magnitude, the first phase angle, and the first frequency and the second current, the second voltage magnitude, the second phase angle, and the second frequency;

and predicting steady-state current and transient-state current after loop closing based on the topological structure of the first path power supply unit, the topological structure of the second path power supply unit, the load characteristics of the first path power supply bus and the load characteristics of the second path power supply unit, wherein the loop closing state information at least comprises the voltage difference, the phase angle difference and the frequency difference.

5. The system for detecting and controlling loop closing power conversion for low voltage power distribution according to claim 4, wherein the loop closing pre-judging module judges whether the loop closing state information meets a preset loop closing requirement set, and comprises:

calculating a differential pressure based on the voltage difference and the phase angle difference, and judging whether the differential pressure meets a preset differential pressure condition;

judging whether the phase angle difference meets a preset phase angle difference condition or not;

judging whether the frequency difference meets a preset frequency difference condition or not;

judging whether the steady-state current and the transient current meet the preset loop closing stability requirement or not.

6. The system of claim 5, wherein the loop closing pre-determination module calculates the differential pressure by the following formula:

wherein (1)>Is differential pressure, +.>First voltage amplitude for the t-th period, < >>Is the phase angle difference>Second voltage amplitude for the t-th period, < >>Is the total number of cycles.

7. The loop closing power conversion detection and regulation system for low-voltage power distribution according to claim 1, wherein the loop closing unit comprises a first executing switch, a second executing switch and a third executing switch, wherein the first executing switch is connected in series between the first path of power supply unit and the first path of power supply bus, the second executing switch is connected in series between the second path of power supply unit and the second path of power supply bus, and the third executing switch is connected in series between the first path of power supply bus and the second path of power supply bus;

The loop closing execution module controls the loop closing unit to complete loop closing operation, and the loop closing execution module comprises:

when the first path of power supply unit is the fault path of power supply unit, the first executing switch is in an off state, and the second executing switch and the third executing switch are controlled to be in an on state;

when the second path power supply unit is the fault path power supply unit, the second execution switch is in an open state, and the first execution switch and the third execution switch are controlled to be in a closed state;

the loop closing execution module controls the loop closing unit to complete loop opening operation, and the loop closing execution module comprises:

and controlling the first executing switch and the second executing switch to be in a closed state, and controlling the third executing switch to be in an open state.