WO2023202018A1

WO2023202018A1 - Multi-mode power distribution terminal protection control apparatus and method based on analog-to-digital array

Info

Publication number: WO2023202018A1
Application number: PCT/CN2022/127149
Authority: WO
Inventors: 林希; 张浩民; 赖奎; 杨玺; 陈锦洪; 张锦添; 徐伟斌; 邝朝炼; 马超; 武建平; 潘松波; 胡泰; 吴伟; 吴菲菲
Original assignee: 广东电网有限责任公司江门供电局
Priority date: 2022-04-18
Filing date: 2022-10-24
Publication date: 2023-10-26
Also published as: CN114498588A; CN114498588B

Abstract

The present invention provides a multi-mode power distribution terminal protection control apparatus and method based on an analog-to-digital array. The apparatus comprises a traditional protection policy module, a control policy module, and a control logic module; the control policy module configures corresponding basic control policies according to intelligent application requirements or special events in engineering; and the control logic module relates to outlet action logic that the control policy module acts on the traditional protection policy module, and performs multi-mode protection control on outlet tripping of protection modules according to various basic control policies. The present invention increases the control policy module and the control logic module on the basis of an original traditional protection policy module, and on the basis of original action logic of the protection modules, configures the corresponding control policies and performs multi-mode protection control according to intelligent requirements, thereby realizing intelligent control design of existing hot plugging protection modules.

Description

Multi-mode power distribution terminal protection control device and method based on analog-digital array

Technical field

The invention belongs to the technical field of distribution network protection, and specifically relates to a multi-modal power distribution terminal protection control device and method based on a modulus array.

Background technique

Compared with the protection of the main network system, the distribution network protection is relatively simple, and protection strategies such as current protection, zero-sequence protection, and low-voltage protection are commonly used. However, due to the large number of branches in the distribution network system and the influence of ring network current factors, when the protection value design is not perfect enough, false tripping events of distribution network protection occur frequently. More importantly, the communication level protected under the terminal architecture in the current distribution network system is average, which not only fails to fundamentally optimize the false tripping events of distribution network protection, but also hinders the upgrading and transformation of the distribution network system. Furthermore, for the current stage of distribution network automation upgrading and transformation, how to intelligently control the function operation of the protection module while solving the communication and real-time update of protection between distribution network terminals is the key to the distribution network automation and intelligent upgrading and transformation. . However, due to the particularity and independence of protection, it is difficult to implement intelligent control design for protection in existing hot-swappable protection modules.

Contents of the invention

In view of this, the present invention aims to solve the problem of insufficient intelligence in protection applications existing in the field of existing distribution network automation.

In order to solve the above technical problems, the present invention provides the following technical solutions:

In the first aspect, the present invention provides a multi-modal power distribution terminal protection and control device based on an analog-digital array, including: a traditional protection strategy module, a control strategy module and a control logic module;

Traditional protection strategy modules include various hot-swappable protection modules, which are used to realize outlet tripping based on the action logic of the respective protection modules when the distribution network fails;

The control strategy module is used to configure corresponding control strategies according to intelligent application requirements or special events in the project;

The control logic module is the exit action logic of the control strategy module acting on the traditional protection strategy module, and is used to perform multi-modal protection control based on diverse control strategies.

Further, the control strategy module specifically includes: visualized protected modulus array and control strategy;

The protected modular array is composed of the action results of various protection modules at different times. The action results are represented by set numerical values. The protected modular array implements the action logic of various protection modules through the set numerical representation of the action results of various protection modules. visualization;

Control strategies include permissive control strategies, blocking control strategies and tripping control strategies.

Further, the control strategy module's process of setting numerical representation of the action results of various protection modules in the protected modulus array at different times specifically includes:

Obtain the operation status and setting status of various protection modules and complete the original value setting of the operation status and action status of various protection modules based on the actual input voltage and current signals of various protection modules;

Obtain the action time of various protection modules and generate the corresponding modular decomposition results. The modular decomposition results include the operation results, action results and corresponding action conditions at different times of the protection modules;

The modular decomposition results corresponding to various types of protection modules are used to form a protected modular array.

Further, the control strategy module updates the protected analog-to-digital array in real time through preset analog-to-digital conversion. The preset analog-to-digital conversion process specifically includes:

Collect the voltage and current analog signals of the primary line, and convert the analog signals through preset analog-to-digital conversion to convert the corresponding voltage and current analog signals into digital quantities output with effective values;

Input digital quantities into the action criteria of various protection modules, output the action results of various protection modules, and update the protected modulus array.

Further, the control strategy module uses the protected modulus array to establish the action criteria of the control strategy. Suppose y _ij represents the action result of protection module i at time j, and y _ij =1 represents the action of protection module i at time j. Then the control strategy The specific action criteria are:

For the permissive control strategy, the action criterion is min{y _ij ≥1}, that is, the first protective action with a value of 1 in y _ij ;

For the latching control strategy, the action criterion is latching event + if {y _i1 ≥ 1}, that is, when the latching event occurs, if y _i1 is not less than 1, the latching function will be started immediately;

For the trip control strategy, the action criterion is if{y _ij ≥1}, that is, if y _ij is not less than 1, the trip function will be activated immediately.

Further, the control logic module presets the working mode according to the control strategy. The working mode specifically includes:

According to the permissive control strategy, the first mode is preset, and the first mode is used to prevent protection malfunction;

According to the blocking control strategy, the second mode is preset, and the second mode is used for excitation inrush current blocking;

According to the tripping control strategy, the third and fourth modes are preset, and the third and fourth modes are respectively used for front acceleration tripping and rear acceleration tripping of distribution network protection.

Further, the action logic of the control logic module in the first mode is specifically:

When the protection signal output result of the traditional protection strategy module is consistent with the protection signal output result of the control strategy module, the trip output is started.

Further, the action logic of the control logic module in the second mode is specifically:

When the no-load closing time of the main transformer occurs, if y _i1 is not less than 1, the blocking function will be started immediately; when the blocking event ends, the normal judgment logic will be restored.

Further, the action logic of the control logic module in the third mode and the fourth mode is specifically:

If there is a situation in y _ij that is not less than 1, the tripping function will be started immediately and a judgment will be made as to whether the line is prioritized for tripping. If the line it is on has priority tripping privileges, the working exit will be tripped directly, that is, front acceleration tripping. If the line is not given priority, Trip privilege, wait for the line with priority trip privilege to trip. If the fault still exists after the predetermined time, the trip will be accelerated after startup.

In a second aspect, the present invention provides a multi-modal distribution terminal protection and control method based on an analog-digital array, which includes the following steps:

Configure corresponding control strategies according to intelligent application requirements or special events in the project;

Generate multi-modal exit action logic based on diverse control strategies;

Multi-modal exit action logic is used to perform multi-modal protection control on the exit tripping of various protection modules.

In summary, the present invention provides a multi-modal power distribution terminal protection and control device and method based on an analog-digital array. The device includes a traditional protection strategy module, a control strategy module and a control logic module, where the control strategy module is based on intelligent engineering Configure the corresponding basic control strategy according to the application requirements or special events. The control logic module is the exit action logic of the control strategy module acting on the traditional protection strategy module. It conducts multi-mode exit tripping of the protection module based on various basic control strategies. State protection control. The present invention adds a control strategy module and a control logic module to the original traditional protection strategy module, and configures corresponding control strategies according to intelligent requirements based on the original action logic of the protection module and performs multi-modal protection control, thereby realizing Intelligent control design of existing hot-swappable protection modules.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a strategic architecture diagram of a multi-modal power distribution terminal protection and control device based on an analog-to-digital array provided by an embodiment of the present invention;

Figure 2 is a schematic diagram of a visual protected modular array provided by an embodiment of the present invention;

Figure 3 is a schematic diagram of a digital-to-analog conversion method provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, what is described below The embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Compared with the protection of the main network system, the distribution network protection is relatively simple, and protection strategies such as current protection, zero-sequence protection, and low-voltage protection are commonly used. However, due to the large number of branches in the distribution network system and the influence of ring network current factors, false tripping events of distribution network protection occur frequently when the protection value design is not perfect enough. More importantly, the communication level protected under the terminal architecture in the current distribution network system is average, which not only fails to fundamentally optimize the false tripping events of distribution network protection, but also hinders the upgrading and transformation of the distribution network system. Furthermore, for the current stage of distribution network automation upgrading and transformation, how to intelligently control the function operation of the protection module while solving the communication and real-time update of protection between distribution network terminals is the key to the distribution network automation and intelligent upgrading and transformation. , then, due to the particularity and independence of protection, it is difficult to implement intelligent control design of protection in existing hot-swappable protection modules.

The existing distribution network protection lacks effective control strategies and relies only on traditional protection methods, resulting in frequent false tripping events. At the same time, because the distribution network protection is relatively simple, it is difficult to integrate intelligent control strategies and it is not easy to realize automatic upgrades and transformations of the distribution network. .

Based on this, the present invention provides a multi-mode power distribution terminal protection and control device and method based on an analog-to-digital array.

The following is a detailed introduction to an embodiment of a multi-mode power distribution terminal protection and control device based on an analog-to-digital array of the present invention.

Please refer to Figure 1. This embodiment provides a multi-modal power distribution terminal protection and control device based on an analog-digital array, including: a traditional protection strategy module, a control strategy module and a control logic module.

In this embodiment, the traditional protection strategy module is the basic module of power distribution protection, which is mainly composed of various hot-swappable protection modules. When the distribution network fails, the outlet will be tripped based on the action logic of the respective protection modules.

In this embodiment, the control strategy module can configure the corresponding control strategy according to the intelligent application requirements (or special events) in the project, thereby realizing the intelligent application of the traditional protection strategy module.

It should be noted that intelligent application requirements or special events in engineering include preventing protection malfunctions, excitation inrush current blocking and front acceleration/rear acceleration, etc. Configuring corresponding basic control strategies according to various application needs or special events, combined with the distribution network protection logic based on the traditional protection strategy module, can achieve targeted intelligent distribution network protection.

Specifically, the control strategy module mainly consists of a protected modulus array and a control strategy. Among them, the protected modulus array has the characteristic of visualization. The protected modular array is composed of the action results of various protection modules at different times. The action results are represented by set numerical values. The protected modular array implements the action logic of various protection modules through the set numerical representation of the action results of various protection modules. visualization. In the actual implementation process, the modulus array can be composed of different values of y _ij , i is the number of the protection module, j is the time number of the protection module, the value of y _ij is "0" or "1", y _ij = “0” represents that the protection module i is not operating at time Δt _j , and y _ij = “1” represents that the protection module i is operating at time Δt _j .

Control strategies mainly include permissive control strategies, blocking control strategies and tripping control strategies.

The control strategy module's numerical representation process of setting the action results of various protection modules in the protected modulus array at different times specifically includes:

S100: Obtain the operation status and setting status of various protection modules and complete the original value setting of the operation status and action status of various protection modules based on the actual input voltage and current signals of various protection modules.

Taking protection module i as an example, mark the operation result of protection module i as x _i . When protection module i is in operation, x _i = “1”; when protection module i is not in operation, x _i = “0” ”; Mark the action result of protection module i as yi. When protection module i acts, y _i = “1”. When protection module i does not act, y _i = “0”; the _control strategy module can be obtained from In the traditional protection strategy module, the operation status and setting status of protection module i are obtained, and the original value setting of x _i and y _i is completed based on the actual input detection voltage/current signal.

S200: Obtain the action times of various protection modules and generate corresponding modular decomposition results. The modular decomposition results include the operation results, action results and corresponding action conditions at different times of the protection modules.

After the original value is set, on this basis, combined with the action time Δt _j of the protection module i, the value result of y _ij can be plotted. The mathematical expression can be recorded as: y _ij =x _i y _j (1+t- Δt _j ), when the value of y _ij is ≥ 1, it is recorded as y _ij = "1", when the value of y _ij is less than 1, it is recorded as y _ij = "0"; if the protection module i is put into operation, the real-time voltage/ The protection operates under current, and it is a quick-break protection with Δt ₁ time response, then the modular decomposition result is {x _i =1, y _i =1, y _i1 =1, y _i2 =1, y _ij =1}; If protection module i is put into operation, the protection operates under real-time voltage/current, and it is a delay protection with Δtj time response, then the modular decomposition result is {x _i =1, y _i =1, y _i1 =0, y _i2 =0, y _ij =1}.

S300: Use the modulus deserialization results corresponding to various protection modules to form a protected modulus array.

According to the above method, the calculation of all values in the modulus array y _ij can be completed. The calculated modulus array is shown in Figure 2.

As shown in Figure 3, the control strategy module also updates the protected analog-to-digital array in real time through preset analog-to-digital conversion. The specific process is to collect the voltage/current analog signal of the primary line through the transformer. This analog signal is input to the signal acquisition module of the distribution terminal, and the corresponding voltage/current analog signal is converted through the preset digital-to-analog conversion. It is a digital quantity with "effective value output". This digital quantity is input to the action criterion of protection module i. The action is recorded as "1", and the non-action is recorded as "0". The modulus array y is updated through data update. _ij .

As shown in Figure 2, the control strategy can be diversified according to the values of the modulus array y _ij . Among them, for the "permissive" control strategy, the mathematical expression of the action criterion is: min{y _ij ≥1} , that is, the first protective action with a value of "1" in y _ij (at this time, a permission signal is sent); for the "locking" control strategy, the mathematical expression of the action criterion is: locking event + if { y _i1 ≥ 1}, that is, when a locking event occurs, if y _i1 is greater than or equal to 1, the "locking function" will be started immediately; for the "trip type" control strategy, the mathematical expression of the action criterion is : if{y _ij ≥1}, that is, if y _ij is greater than or equal to 1, the "trip function" will be activated immediately; establishing an analog-to-digital array through analog-to-digital conversion can simplify the complex protection action logic into modulus The calculation of the numerical values y _ij of the array greatly shortens the calculation time and cost, and facilitates the design of diversified control strategies.

In this embodiment, the control logic module is the export action logic of the control strategy module acting on the traditional protection strategy module, and is used to perform multi-modal protection control according to diversified control strategies.

It should be noted that the control logic module can preset working modes according to different control strategies.

Among them, mode 1 can be preset according to the "permissive" control strategy: to prevent protection malfunctions. Its working principle is as follows. The traditional protection strategy module outputs the protection signal outlet, and the control strategy module uses the update calculation of the modulus array and The design of the "permissive" control strategy can also realize the analog output of the protection signal. When the protection signal export result of the traditional protection strategy module is consistent with the protection signal analog output result of the control strategy module, the trip output is started. In this process, Due to the rapidity of analog-to-digital conversion and the efficiency of numerical solution of analog-to-digital array y _ij , the calculation speed of the control strategy module will be better than that of the traditional protection strategy module. Therefore, the control strategy module can not only ensure that the traditional protection strategy module does not malfunction, It will not affect the action time of the traditional protection strategy module export.

Mode 2: excitation inrush current blocking can be preset according to the "locking" control strategy. Its working principle is as follows. Since the calculation speed of the control strategy module is better than that of the traditional protection strategy module, when the main transformer no-load closing event occurs, if If {y _i1 ≥1} exists, the "locking function" can be started in advance. When the locking event ends, the normal judgment logic will be restored. Through the above strategy, the protection tripping event caused by the excitation inrush current when the main transformer is put into operation can be realized.

According to the "trip-type" control strategy, mode 3/4 can be preset: the front acceleration/post-acceleration design of distribution network protection. Its working principle is as follows. If {y _ij ≥1} exists, the "trip strategy" can be started. ”, and then make a judgment of “whether the line has priority tripping privileges”. If the line you are on has priority tripping privileges, the exit will be tripped directly, which is a front-acceleration trip. If the line you are on does not have priority tripping privileges, it will wait for the line with priority tripping privileges to trip. , if the fault still exists after the predetermined time, it will accelerate and trip after starting.

This embodiment provides a multi-mode power distribution terminal protection and control device based on a modulus array. The device aims to improve the intelligent application of distribution network terminal protection. On the basis of the traditional protection strategy module, the device adds intelligent control The strategy module and control logic module have the following advantages:

1. Based on the analog-to-digital conversion mechanism, establish a protected analog-to-digital array, and propose mathematical criteria for digital-to-analog array calculation and control strategy design. The calculation method of modular array is used to greatly shorten the calculation logic and time of protection. By selecting the time micro-unit, the numerical result of y _ij moment proof can be quickly calculated, and "0" and "1" are selected as the output observation objects. The table results are direct and clear, the calculation time cost is low, and it is easy to design subsequent complex and intelligent control strategies.

2. Propose the basic control strategy modules of "permissive", "blocking" and "trip" to facilitate the subsequent secondary development of diversified control strategies. The proposal of three basic control strategy modules has typical engineering application value and intuitive mathematical criteria, making it easy to develop and debug subsequent intelligent control strategies.

3. The protection control strategy proposed in this embodiment is oriented to specific engineering problems. On this basis, a control strategy including "preventing protection malfunction", "excitation inrush current blocking", and "front acceleration/rear acceleration" is proposed. And it is easy to develop software and hardware modules.

The above is a detailed introduction to the embodiments of a multi-modal distribution terminal protection and control device based on an analog-digital array of the present invention. The following is a detailed introduction to a multi-modal distribution terminal protection and control method based on an analog-digital array of the present invention. The embodiments are introduced in detail.

This embodiment provides a multi-mode power distribution terminal protection control method based on an analog-digital array, which includes the following steps:

Generate multi-modal exit action logic based on diverse control strategies;

It should be noted that the control strategy configured in the protection control method provided by this embodiment is the same as that in the previous embodiment. The control strategy module uses the analog-to-digital conversion method to establish a protected analog-to-digital array, and then configures the action criteria of the corresponding control strategy. The specific implementation process is the same, and the multi-modal exit action logic is the same as the specific implementation process in which the control logic module presets multiple modes based on the control strategy to perform exit trip control in the previous embodiment, so it will not be described again here.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions of the foregoing embodiments. The recorded technical solutions may be modified, or some of the technical features thereof may be equivalently replaced; however, these modifications or substitutions shall not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims

A multi-mode power distribution terminal protection and control device based on an analog-to-digital array is characterized by including: a traditional protection strategy module, a control strategy module and a control logic module;

The traditional protection strategy module includes various types of hot-swappable protection modules, which are used to realize outlet tripping based on the action logic of the respective protection modules when the distribution network fails;

The control strategy module is used to configure corresponding control strategies according to intelligent application requirements or special events in the project. The control strategy module specifically includes: a visualized protected modulus array and the control strategy;

The protected modular array is composed of the action results of various types of protection modules at different times. The action results are represented by set numerical values. The protected modular array is realized by the set numerical representation of the action results of various types of protection modules. Visualization of action logic of various protection modules;

The control strategies include permissive control strategies, blocking control strategies and tripping control strategies;

The control strategy module uses the protected modulus array to establish the action criteria of the control strategy. Suppose y ij represents the action result of protection module i at time j, and y ij =1 represents the action of protection module i at time j. Then the action criteria of the control strategy are specifically:

For the permissive control strategy, the action criterion is min{y ij ≥1}, that is, the first protective action with a value of 1 in y ij ;

For the latching control strategy, the action criterion is latching event + if {y i1 ≥ 1}, that is, when the latching event occurs, if y i1 is not less than 1, the latching function will be started immediately;

For the trip control strategy, the action criterion is if{y ij ≥1}, that is, if y ij is not less than 1, the trip function will be activated immediately;

The control logic module is the export action logic of the control strategy module acting on the traditional protection strategy module, and is used to perform multi-modal protection control according to the diversified control strategies.
The multi-mode power distribution terminal protection and control device based on the modular array according to claim 1, characterized in that the control strategy module determines the action results of various protection modules in the protected modular array at different times. The process of setting numerical representation specifically includes:

Obtain the operation status and setting status of various protection modules and complete the original value setting of the operation status and action status of various protection modules based on the actual input voltage and current signals of various protection modules;

Obtain the action times of various protection modules and generate corresponding modular decomposition results. The modular decomposition results include the operation results, action results and corresponding action conditions at different times of the protection modules;

Modulus decomposition results corresponding to various types of protection modules constitute the protected modulus array.
The multi-mode power distribution terminal protection and control device based on an analog-to-digital array according to claim 2, wherein the control strategy module updates the protected analog-to-digital array in real time through preset analog-to-digital conversion, and the The preset analog-to-digital conversion process specifically includes:

Collect the voltage and current analog signals of the primary line, and pass the analog signals through preset analog-to-digital conversion to convert the corresponding voltage and current analog signals into digital quantities output with effective values;

Input the digital quantity into the action criteria of various protection modules to output the action results of various protection modules and update the protected modulus array.
The multi-mode power distribution terminal protection and control device based on analog-digital array according to claim 1, characterized in that the control logic module presets a working mode according to the control strategy, and the working mode specifically includes:

According to the permissive control strategy, a first mode is preset, and the first mode is used to prevent protection malfunction;

According to the blocking control strategy, a second mode is preset, and the second mode is used for excitation inrush current blocking;

According to the trip control strategy, third and fourth modes are preset, and the third and fourth modes are respectively used for front acceleration tripping and rear acceleration tripping of distribution network protection.
The multi-mode power distribution terminal protection and control device based on an analog-to-digital array according to claim 4, wherein the action logic of the control logic module in the first mode is specifically:

When the protection signal output result of the traditional protection strategy module is consistent with the protection signal output result of the control strategy module, the trip output is started.
The multi-mode power distribution terminal protection and control device based on an analog-to-digital array according to claim 4, wherein the action logic of the control logic module in the second mode is specifically:

When the no-load closing time of the main transformer occurs, if y i1 is not less than 1, the blocking function will be started immediately; when the blocking event ends, the normal judgment logic will be restored.
The multi-mode power distribution terminal protection and control device based on an analog-digital array according to claim 4, characterized in that the action logic of the control logic module in the third and fourth modes is specifically:

If there is a situation in y ij that is not less than 1, the tripping function will be started immediately, and a judgment will be made as to whether the line is prioritized for tripping. If the line enjoys priority tripping privileges, the working exit will be tripped directly, that is, the front acceleration trip. If the line is not If it enjoys priority tripping privileges, it will wait for the line with priority tripping privileges to trip. If the fault still exists after the predetermined time, the above-mentioned accelerated tripping will be started.
The multi-modal power distribution terminal protection and control method based on the modulus array is applied to the multi-modal power distribution terminal protection and control device based on the modulus array according to any one of claims 1-7, which is characterized in that it includes: Following steps:

Configure corresponding control strategies according to intelligent application requirements or special events in the project;

Generate multi-modal exit action logic based on the diversified control strategies;

The multi-modal exit action logic is used to perform multi-modal protection control on the exit tripping of various protection modules.