A simulation test system and method for self-healing function of power distribution master station

Abstract

The application belongs to the field of electric power, and discloses a simulation test system and method for self-healing function of a power distribution master station, which comprises a double-power hand-in-hand overhead feeder line automatic line model, a fault library and a communication configuration unit. The system can simulate current and voltage signals, switch actions and various abnormal states occurring in the self-healing process of each type of fault state under each type of feeder automation mode on the double-power hand-in-hand overhead feeder line automatic line model through the fault library by setting the double-power hand-in-hand overhead feeder line automatic line model and the fault library. The system can simulate the fault handling process of each type of fault and fault interval of various modes of feeder automation, such as centralized feeder automation, on-site reclosing feeder automation, intelligent distributed feeder automation and differential protection mode feeder automation, and can test the self-healing function and fault tolerance of the power distribution master station under different feeder automation modes. The system has multiple test samples, wide scenes and high efficiency.

Description

Technical Field

[0001] This invention belongs to the field of power, and in particular relates to a simulation test system and method for the self-healing function of a power distribution station. Background Technology

[0002] The distribution automation master station system is the core component of the distribution automation system. It is an important means of realizing distribution network scheduling and operation management, and also serves as the human-machine interface for implementing distribution automation functions. The self-healing technology of the distribution master station is mainly applicable to the centralized distribution automation construction mode, relying on whether the distribution terminal detects an overcurrent signal to determine the faulty section.

[0003] Current distribution automation infrastructure is primarily localized, with most distribution terminals employing voltage-time automation. When a line fault occurs, a blocking signal is sent to the distribution master station, but overcurrent alarm information cannot be transmitted. Therefore, the existing self-healing function of the distribution master station needs to automatically identify fault sections in localized feeder automation lines. Consequently, automatic fault section identification testing technology is crucial for improving the self-healing function of the distribution master station.

[0004] Currently, feeder automation testing typically employs an injection-type power source method, specifically using a relay protection device, as illustrated in the patent "A Simulation Test Method for a Distribution Automation System Based on a Communication Network" (CN106527181B). However, testing the self-healing function of the distribution master station usually requires injecting power sources into multiple distribution terminals along the entire line. Since these terminals are physically spaced apart, they cannot be supplied with signals from a single power source. If multiple power sources are used to inject signals separately, they cannot output signals simultaneously, and it is difficult to simulate various feeder automation modes. Furthermore, simulating abnormal situations such as switch failures and communication malfunctions is also challenging.

[0005] In summary, how to conduct orderly and efficient testing and verification of the self-healing function of the distribution substation is an important and fundamental professional management task that all power grid companies urgently need to address. Summary of the Invention

[0006] To address or improve the aforementioned problems, this invention provides a simulation testing system and method for the self-healing function of a power distribution master station, the specific technical solution of which is as follows:

[0007] This invention provides a simulation test system for the self-healing function of a power distribution master station, characterized in that it includes:

[0008] The automated line model, fault database, communication configuration unit, and tested power distribution master station of the dual-power daisy-chain overhead feeder system.

[0009] The dual-power hand-in-hand overhead feeder automation line model is used to simulate the current and voltage signals and switching actions of various fault states under various feeder automation modes.

[0010] The fault database is communicatively connected to the dual-power daisy-chain overhead feeder automated line model; it is used to provide telemetry and teleindication characteristic quantities for different fault locations and different fault types.

[0011] The communication configuration unit is connected to the dual-power daisy-chain overhead feeder automated line model and the tested power distribution master station respectively; it is used to collect data from the dual-power daisy-chain overhead feeder automated line model and perform real-time data interaction with the tested power distribution master station.

[0012] The tested power distribution master station interacts with the communication configuration unit in real time and determines the fault area based on the collected data.

[0013] Preferably, the automated circuit model of the dual-power daisy-chain overhead feeder includes: two power points, a main line, branch lines, and connecting points. The main line is connected to the power points at both ends. Branch lines and connecting points are provided on the main line. Each power point is equipped with an outgoing circuit breaker, and the outgoing circuit breaker is equipped with a power distribution terminal. Power distribution terminals are provided on the branch lines, and power distribution terminals are also provided on the main lines on both sides of the branch lines. Power distribution terminals are also provided on the main lines on both sides of the connecting points. A sectionalizing switch is provided next to each power distribution terminal. The power distribution terminals and sectionalizing switches are communicatively connected to the communication configuration unit. The power distribution terminals provide current and voltage signals for various fault conditions, and the sectionalizing switches provide switching actions.

[0014] Preferably, one of the power supply points outputs at least two lines, namely a main line and a branch line. The branch line is equipped with a power distribution terminal and a sectionalizing switch that are communicatively connected to the communication configuration unit. The branch line is used to simulate fault conditions at different fault locations. Furthermore, one or more branch lines can be provided.

[0015] Preferably, the dual-power hand-in-hand overhead feeder automated line model and the communication configuration unit are connected via a wired network and a wireless communication network.

[0016] Preferably, the dual-power hand-in-hand overhead feeder automated line model can also simulate abnormal states that occur during the self-healing process of the distribution master station. The abnormal states include switch failure and communication interruption, which are used to detect the fault tolerance capability of the self-healing function of the distribution master station under test in abnormal states.

[0017] Preferably, the fault locations include: between the outgoing circuit breaker and the first distribution terminal on the main line, between the main line and the branch line, between the tie switch and the adjacent distribution terminal, and at least two of the branch lines.

[0018] Preferably, the different fault types include: ground fault or short circuit fault.

[0019] Another option for this application:

[0020] A simulation test method for the self-healing function of a power distribution master station, applicable to the aforementioned simulation test system, includes the following test method:

[0021] S1 selects fault simulation test items from the fault database;

[0022] S2 issues telemetry and telesignal characteristics of different fault locations and types based on the fault database of the test project, controls the operation of the sectionalizing switches, distribution terminals and outgoing circuit breakers of the dual-power hand-in-hand overhead feeder automation line model, and feeds back the operating data of the sectionalizing switches, distribution terminals and outgoing circuit breakers to the tested power distribution master station through the communication configuration unit.

[0023] The tested power distribution station in S3 determines the fault area based on the collected operating data of the sectionalizing switches and outgoing circuit breakers.

[0024] Preferably, the simulation test items include: self-healing function detection and fault tolerance capability detection of the tested power distribution master station.

[0025] Preferably, the simulation test items specifically include: master station conventional self-healing function test in master station centralized mode, master station self-healing fault tolerance test in master station centralized mode, master station conventional self-healing function test in voltage-time local reclosing mode, master station self-healing fault tolerance test in voltage-time local reclosing mode, master station conventional self-healing function test in voltage-current mode, master station self-healing fault tolerance test in voltage-current mode, master station conventional self-healing function test in differential protection mode, and master station self-healing fault tolerance test in differential protection mode.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. The main system, by setting up a dual-power daisy-chain overhead feeder automation line model and a fault database, can simulate various fault states, current and voltage signals, switch actions, and various abnormal states that occur during the self-healing process under various feeder automation modes on the dual-power daisy-chain overhead feeder automation line model. It can realize the simulation of various fault types and fault ranges in various modes of distribution master station centralized feeder automation, local reclosing feeder automation, intelligent distributed feeder automation, and differential protection feeder automation, so as to verify the self-healing function and fault tolerance capability of the distribution master station under different feeder automation modes.

[0028] 2. This system's dual-power daisy-chain overhead feeder automation line model sets up distribution terminals and sectionalizing switches at each node. It interacts with the tested distribution master station in real time via wired and wireless communication networks. By comparing the preset fault and non-fault section restoration processes with the fault sections and restoration processes identified by the distribution master station, the accuracy of the distribution master station's self-healing function can be determined. Compared with the existing injection-type power source method for relay protection devices, this testing system provides a more realistic testing environment, more test examples, wider applicability, and higher testing efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a simulation test system for the self-healing function of a power distribution master station according to the present invention;

[0030] Figure 2 This is a wiring diagram of the automated line model of the dual-power hand-in-hand overhead feeder according to the present invention; wherein, FB, FB', and FB” are substation outgoing circuit breakers; S1, S2, S3, and S1” are sectionalizing switches; LS is the connecting switch for the two hand-in-hand lines; and F1-F5 are line faults in different sections.

[0031] Explanation of key figure labels:

[0032] 1. Dual-power daisy-chain overhead feeder automated circuit model; 2. Fault database; 3. Communication configuration unit; 4. Test power distribution master station. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0035] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0036] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0037] Example 1

[0038] like Figure 1 As shown, a simulation test system for the self-healing function of a power distribution master station includes:

[0039] The automated line model, fault database, communication configuration unit, and tested power distribution master station of the dual-power daisy-chain overhead feeder system.

[0040] The dual-power hand-in-hand overhead feeder automation line model is used to simulate the current and voltage signals and switch actions of various fault states under various feeder automation modes; at the same time, it can also simulate the abnormal states that occur during the self-healing process of the power distribution station. The abnormal states include switch failure to operate, communication interruption, etc., to detect the fault tolerance capability of the self-healing function of the power distribution station under test under abnormal states.

[0041] The fault database is communicatively connected to the dual-power hand-in-hand overhead feeder automated line model; it is used to provide telemetry and telesignal characteristics for different fault locations and different fault types.

[0042] The communication configuration unit is connected to the dual-power daisy-chain overhead feeder automated line model and the tested power distribution master station, respectively, to collect data from the dual-power daisy-chain overhead feeder automated line model and to perform real-time data interaction with the tested power distribution master station.

[0043] The tested power distribution master station interacts with the communication configuration unit in real time and determines the fault area based on the collected data.

[0044] By comparing the power restoration process of the fault range and non-fault range preset in the fault database with the fault range and power restoration process identified by the power distribution master station, the accuracy of the power distribution master station's self-healing function can be determined.

[0045] Specifically, the automated dual-power daisy-chain overhead feeder line model is a 10kV automated dual-power daisy-chain overhead feeder line model. The model includes: two power supply points, a main line, branch lines, and connecting points. The main line is connected to the power supply points at both ends. Branch lines and connecting points are located on the main line. Each power supply point is equipped with an outgoing circuit breaker, which is configured with a distribution terminal. Distribution terminals are located on the branch lines, and on the main lines on both sides of the branch lines. Distribution terminals are also located on the main lines on both sides of the connecting points. Section switches are installed next to each distribution terminal. The distribution terminals and section switches interact with the communication configuration unit in real time via wired networks such as fiber optics and wireless communication networks such as GPRS / 3G / 4G / 5G using 104 or 101 communication protocols. The distribution terminals provide current and voltage signals for various fault conditions, and the section switches provide switching actions.

[0046] In some embodiments, one of the power supply points outputs two lines, namely the main line and the branch line. The branch line is equipped with a power distribution terminal and a sectionalizing switch that are communicatively connected to the communication configuration unit. The branch line configuration can simulate the fault states of more fault points.

[0047] Specifically, during the self-healing process, if an abnormal state occurs, such as when a switch fails to operate, can the tested power distribution master station still correctly determine the fault area based on current and other data? This determines the fault tolerance capability of the tested power distribution master station.

[0048] Specifically, the fault locations include: between the outgoing circuit breaker and the first distribution terminal on the main line, between the main line and a branch line, between the tie switch and an adjacent distribution terminal, and within the branch line. The different fault types include: grounding faults or short-circuit faults. Using a fault database, the current and voltage signals, switch actions, and various abnormal states occurring during the self-healing process of various fault states under different feeder automation modes are simulated on a dual-power daisy-chain overhead feeder automation line model. This simulates the fault handling process for various methods, including centralized feeder automation at the main station, local reclosing feeder automation, intelligent distributed feeder automation, and differential protection feeder automation. By comparing the preset fault interval and non-fault interval restoration process with the fault interval and restoration process identified by the distribution main station, the accuracy of the distribution main station's self-healing function can be determined.

[0049] Example 2

[0050] Combination Figure 2Taking the voltage-time type local feeder automation mode as an example, if a short-circuit fault occurs between S1 and S2, i.e., a short-circuit fault occurs at F2, the system simulates the fault handling process on the line as follows: FB activates the "instantaneous overcurrent protection" function and trips; → S1, S2, and S3 both sides lose voltage and trip, LS one side loses voltage and enters delayed closing state; → FB activates the first reclosing and closes; → S1 delays closing and closes at the fault; → FB activates the "instantaneous overcurrent protection" function again and trips; → S1 both sides lose voltage and trip, S1 forward blocking, S2 reverse blocking, and S3 reverse blocking; → FB activates the second reclosing and closes; → LS tie switch XL timer ends and automatically closes. After this process, the distribution master station should be able to determine that the fault range is between S1 and S2 through the telemetry and tele-signaling information sent by the distribution terminals (S1, S2, S3, LS), that is, the distribution master station's self-healing function has high accuracy. If the distribution terminals (S1, S2, S3, LS) do not send any information to the distribution master station during this process, the distribution master station should be able to determine that the fault range is between S1 and S2 based on the operation information of the substation outgoing circuit breaker FB and the terminal parameter information, thereby determining the fault tolerance rate of the distribution master station's self-healing function.

[0051] In addition, it can simulate the fault handling process under the following situations: short circuit fault F1, short circuit fault F3, short circuit fault F4, ground fault F2, ground fault F5 and incorrect line selection causing the outgoing circuit breaker FB of line 1 to trip, short circuit fault F3 and S2 cannot be positively blocked.

[0052] In summary, the system, by setting up a dual-power daisy-chain overhead feeder automation line model and a fault database, can simulate various fault states, current and voltage signals, switching actions, and abnormal states occurring during self-healing under different feeder automation modes on the dual-power daisy-chain overhead feeder automation line model. This allows for the simulation of fault handling processes for different fault types and fault ranges, and can verify the self-healing function and fault tolerance of the distribution substation under different feeder automation methods. It provides a near-realistic testing environment with numerous test examples, a wide range of scenarios, and high efficiency.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A simulation test system for the self-healing function of a power distribution master station, characterized in that, include: The automated line model, fault database, communication configuration unit, and tested power distribution master station of the dual-power daisy-chain overhead feeder system. The dual-power hand-in-hand overhead feeder automation line model is used to simulate the current and voltage signals and switching actions of various fault states under various feeder automation modes. The fault database is communicatively connected to the dual-power daisy-chain overhead feeder automated line model; it is used to provide telemetry and teleindication characteristic quantities for different fault locations and different fault types. The communication configuration unit is connected to the dual-power daisy-chain overhead feeder automated line model and the tested power distribution master station respectively; it is used to collect data from the dual-power daisy-chain overhead feeder automated line model and perform real-time data interaction with the tested power distribution master station. The tested power distribution master station interacts with the communication configuration unit in real time and determines the fault area based on the collected data; The automated circuit model of the dual-power daisy-chain overhead feeder includes: two power points, a main line, branch lines, and connecting points. The main line is connected to the power points at both ends. Branch lines and connecting points are provided on the main line. Each power point is equipped with an outgoing circuit breaker, which is configured with a power distribution terminal. Power distribution terminals are provided on the branch lines, and power distribution terminals are also provided on the main lines on both sides of the branch lines. Power distribution terminals are also provided on the main lines on both sides of the connecting points. A sectionalizing switch is installed next to each power distribution terminal. The power distribution terminals and sectionalizing switches are communicatively connected to the communication configuration unit. The power distribution terminals provide current and voltage signals for various fault conditions, and the sectionalizing switches provide switching actions.

2. The simulation test system for the self-healing function of the power distribution master station according to claim 1, characterized in that, One of the power supply points outputs at least two lines, namely the main line and the branch line. The branch line is equipped with a power distribution terminal and a sectionalizing switch that are connected to the communication configuration unit. The branch line is used to simulate the fault state at different fault locations.

3. The simulation test system for the self-healing function of the power distribution master station according to claim 1, characterized in that, The dual-power daisy-chain overhead feeder automated circuit model is connected to the communication configuration unit via a wired network and a wireless communication network.

4. The simulation test system for the self-healing function of the power distribution master station according to claim 1, characterized in that, The dual-power hand-in-hand overhead feeder automation line model can also simulate abnormal states that occur during the self-healing process of the power distribution station. These abnormal states include switch failure and communication interruption, which are used to detect the fault tolerance capability of the self-healing function of the power distribution station under test in abnormal states.

5. The simulation test system for the self-healing function of the power distribution master station according to claim 1, characterized in that, The fault locations include: between the outgoing circuit breaker and the first distribution terminal on the main line, between the main line and the branch line, between the tie switch and the adjacent distribution terminal, and at least two of the branch lines.

6. The simulation test system for the self-healing function of the power distribution master station according to claim 1, characterized in that, The different fault types include: ground fault or short circuit fault.

7. A simulation test method for the self-healing function of a power distribution station, applicable to the simulation test system described in any one of claims 1-6, characterized in that, include: S1 selects fault simulation test items from the fault database; S2 issues telemetry and telesignal characteristics of different fault locations and types based on the fault database of the test project, controls the operation of the sectionalizing switches, distribution terminals and outgoing circuit breakers of the dual-power hand-in-hand overhead feeder automation line model, and feeds back the operating data of the sectionalizing switches, distribution terminals and outgoing circuit breakers to the tested power distribution master station through the communication configuration unit. The tested power distribution station in S3 determines the fault area based on the collected operating data of the sectionalizing switches and outgoing circuit breakers.

8. The simulation testing method according to claim 7, characterized in that, The simulation test items include: self-healing function test and fault tolerance test of the tested power distribution master station.

9. The simulation testing method according to claim 8, characterized in that, The simulation test items specifically include: main station conventional self-healing function test in main station centralized mode, main station self-healing fault tolerance test in main station centralized mode, main station conventional self-healing function test in voltage-time local reclosing mode, main station self-healing fault tolerance test in voltage-time local reclosing mode, main station conventional self-healing function test in voltage-current mode, main station self-healing fault tolerance test in voltage-current mode, main station conventional self-healing function test in differential protection mode, and main station self-healing fault tolerance test in differential protection mode.

Images