A substation multi-bay testing system and method based on wireless data communication

Abstract

The application discloses a transformer substation multi-interval test system and method based on wireless data communication, and relates to the technical field of transformer substation test systems. The system comprises a whole-station visualization and information interconnection module and a multi-interval synchronous test module. The whole-station visualization and information interconnection module comprises a communication submodule and a test terminal module which are connected with each other. The communication submodule and the test terminal module are connected with the multi-interval synchronous test module. The application realizes multi-interval synchronous increment and signal based on wireless interconnection technology, solves the problem of cross-interval relay protection and automatic function verification in the on-site debugging link of a transformer substation, reduces the workload of basic-level team inspection operation, improves the efficiency of inspection work, and ensures the safety of on-site operation and the standardization of inspection operation.

Description

Technical Field

[0001] This invention belongs to the field of power systems and their automation, and specifically relates to a multi-bay testing system and method for substations based on wireless data communication. Background Technology

[0002] The relay protection testing process in substations remains largely traditional. Testing is limited to a single function at a time, typically done manually. Testers must manually set various test parameters, repeatedly modifying communication configurations, test items, and parameters throughout the process. This is labor-intensive and tedious, lacking system-level checks and resulting in low efficiency, failing to leverage the advantages of highly information-based smart substations. After testing, staff must manually review protection action messages, analyze the results, and record them. Excessive human-machine interaction not only increases the workload for on-site personnel but also introduces significant uncertainty and safety hazards to the standardization and normalization of the testing process. Furthermore, testing multiple bays involving fault protection, automatic transfer switch, and main transformer and bus differential protection is challenging during on-site commissioning, and there is currently no feasible approach for cross-bay synchronous testing.

[0003] Reducing the workload of secondary equipment commissioning at on-site intelligent stations and applying visualization and automated testing technologies to the field are crucial technologies urgently needed for on-site commissioning. Therefore, research into digital protection intelligent operation systems is imperative. Summary of the Invention

[0004] To address the aforementioned shortcomings in the existing technology, this invention provides a substation multi-bay testing system and method based on wireless data communication, which solves the problem of high workload in substation multi-bay testing.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows: a substation multi-bay testing system based on wireless data communication, including a whole-station visualization and information interconnection module and a multi-bay synchronous testing module;

[0006] The whole-site visualization and information interconnection module includes an interconnected communication sub-module and a test terminal module; both the communication sub-module and the test terminal module are connected to the multi-interval synchronous test module.

[0007] The whole-station visualization and information interconnection module is used to connect to the communication network of the substation under test and to read the IED information of the substation under test; the multi-interval synchronous test module is used to output a standard test report.

[0008] Furthermore, the multi-interval synchronous test module is equipped with several test instruments.

[0009] A multi-bay testing method for substations based on wireless data communication includes the following steps:

[0010] S1. The SCD information of the substation under test is parsed through the test terminal module to generate the IED information of the substation under test.

[0011] S2. Connect with the protection device of the substation under test through the communication submodule to obtain the device data model;

[0012] S3. Perform a consistency comparison test on the device data model based on the IED information and obtain a test result report;

[0013] S4. Based on the test result report, perform interval interconnection tests through the multi-interval synchronous test module to obtain a standard test report.

[0014] Further: Step S1 specifically includes:

[0015] Based on the IEC61850 standard, the test terminal module performs setting read / write operations and pressure plate operations on the protection devices of the substation under test, reading the positive differential operating current setting and the positive sequence sensitivity angle setting of the line; then, according to the set three-phase test parameter output and operation duration, the telemetry accuracy test is performed to obtain the SCD information of the substation under test, and the IED information of the substation under test is obtained.

[0016] The beneficial effects of the above-mentioned further solutions are as follows: By parsing the SCD information of the substation under test, the present invention can model the IED device data model according to the IEC61850 protocol; by comparing the IED device data model after parsing the SCD information with the device data model read from the substation protection device, the comparison results are displayed through the whole station visualization and information interconnection module, so as to achieve the effect of accurate display of substation information.

[0017] Further: Step S3 includes the following sub-steps:

[0018] S31. Model the IED information of the substation under test according to the IEC61850 protocol to obtain the IED equipment data model.

[0019] S32. Conduct a consistency comparison test between the IED device data model and the device data model, and obtain a test result report;

[0020] If the consistency comparison test results in model inconsistency, the test result report will include information on the substation's protection device malfunction or corresponding data error.

[0021] If the consistency comparison test shows that the model is consistent, the test result report will include normal information about the substation's protection devices.

[0022] Further: Step S4 specifically involves: filtering the substation protection devices corresponding to test result reports containing information on substation protection device faults or corresponding data errors, and then performing bay interconnection tests on the substation protection devices through a multi-bay synchronous test module to obtain a standard test report.

[0023] The beneficial effects of the above-mentioned further solutions are as follows: the multi-interval synchronous test module realizes the multi-interval synchronous addition of quantity and signal based on wireless interconnection technology, which solves the problem of cross-interval relay protection and automation function verification in the field commissioning of substations.

[0024] Further: In step S4, the method for interval interconnection testing is specifically as follows:

[0025] Each tester is connected to the selected substation protection device. The tester performs voltage telemetry tests at set time intervals and outputs test signals synchronously to obtain recorded voltage data. The effective value of the voltage data is then calculated based on the voltage data and added to the standard test report.

[0026] Further: The method for obtaining the recorded voltage data is as follows:

[0027] The collected voltage data is processed by setting a voltage threshold N. If the current collected voltage data is greater than the voltage threshold N, the voltage data collected in the previous time is used as the current voltage data. The voltage data recorded at time t is obtained based on the voltage data collected at time t.

[0028] Among them, the voltage data x recorded at time t is obtained. t The expression is as follows:

[0029]

[0030] In the formula, u t-j+1 For the voltage data collected at time t-j+1, u t-j+2 For voltage data collected at time t-j+2, u t-1 The voltage data collected at time t-1, u t The voltage data collected at time t; ε t-j+1 ε represents the weight of the voltage data collected at time t-j+1. t-j+2 ε represents the weight of the voltage data collected at time t-j+2. t-1 ε represents the weight of the voltage data collected at time t-1. t The weight of the voltage data collected at time t.

[0031] The beneficial effects of the above-mentioned further scheme are as follows: In order to ensure low error in the recorded voltage data, the currently acquired voltage data and the voltage data acquired in the previous j times are further processed to fit the recorded voltage data with large deviations, so as to obtain the recorded voltage data.

[0032] Further: The expression for calculating the effective value Y of the voltage data is specifically as follows:

[0033]

[0034] Where x1 is the voltage data recorded for the first time, x n Let ω1 be the voltage data recorded for the nth time, and ω1 be the weight of the voltage data recorded for the first time. n The weight for the nth voltage data recording;

[0035] The weight ω of the voltage data recorded in the i-th time i The specific expression is:

[0036] ω i =α×x i +(1-α)x i-1

[0037] Where α is a fixed attenuation value.

[0038] The beneficial effects of this invention are as follows:

[0039] (1) This invention enables multi-bay synchronous addition of quantities and signals based on wireless interconnection technology to solve the problem of cross-bay relay protection and automation function verification in the field commissioning of substations. It reduces the workload of regular inspection work in grassroots teams, improves the efficiency of inspection work, and at the same time ensures the safety of on-site operations and the standardization of regular inspection work.

[0040] (2) The multi-bay synchronous test module of the present invention enables on-site testers to create test plans for the protection devices of the protection bay substation according to test procedures and standards. The test plans for the protection devices of the protection bay substation can provide fast and efficient editing and generation of test result reports.

[0041] (3) This invention uses digital protection testing to analyze multi-interval joint testing methods, compares cross-interval backhaul testing, cross-interval multi-tester joint testing, cross-interval multi-tester coordination testing, and multi-tester fault playback testing, and develops a multi-interval synchronous testing module based on the Manufacturing Message Communication Specification (MMS) communication. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of a multi-bay substation test system based on wireless data communication.

[0043] Figure 2This is a flowchart of the present invention. Detailed Implementation

[0044] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0045] Example 1:

[0046] like Figure 1 As shown, in one embodiment of the present invention, a substation multi-bay testing system based on wireless data communication includes a whole-station visualization and information interconnection module and a multi-bay synchronous testing module.

[0047] The whole-site visualization and information interconnection module includes an interconnected communication sub-module and a test terminal module; both the communication sub-module and the test terminal module are connected to the multi-interval synchronous test module.

[0048] The whole-station visualization and information interconnection module is used to connect to the communication network of the substation under test and to read the IED information of the substation under test; the multi-interval synchronous test module is used to output a standard test report.

[0049] The multi-interval synchronous test module is equipped with several test instruments.

[0050] Example 2:

[0051] This embodiment describes the implementation method of a substation multi-bay testing system based on wireless data communication.

[0052] like Figure 2 As shown, a multi-bay testing method for substations based on wireless data communication includes the following steps:

[0053] S1. The SCD information of the substation under test is parsed through the test terminal module to generate the IED information of the substation under test.

[0054] S2. Connect with the protection device of the substation under test through the communication submodule to obtain the device data model;

[0055] S3. Perform a consistency comparison test on the device data model based on the IED information and obtain a test result report;

[0056] S4. Based on the test result report, perform interval interconnection tests through the multi-interval synchronous test module to obtain a standard test report.

[0057] Step S1 specifically involves:

[0058] Based on the IEC61850 standard, the test terminal module performs setting read / write operations and pressure plate operations on the protection devices of the substation under test, reading the positive differential operating current setting and the positive sequence sensitivity angle setting of the line; then, according to the set three-phase test parameter output and operation duration, the telemetry accuracy test is performed to obtain the SCD information of the substation under test, and the IED information of the substation under test is obtained.

[0059] This invention analyzes the SCD information of the substation under test and can model the IED device data model according to the IEC61850 protocol. It compares the IED device data model after analyzing the SCD information with the device data model read from the substation protection device and displays the comparison results through the whole station visualization and information interconnection module, so as to achieve the effect of accurate display of substation information.

[0060] Step S3 includes the following sub-steps:

[0061] S31. Model the IED information of the substation under test according to the IEC61850 protocol to obtain the IED equipment data model.

[0062] S32. Conduct a consistency comparison test between the IED device data model and the device data model, and obtain a test result report;

[0063] If the consistency comparison test results in model inconsistency, the test result report will include information on the substation's protection device malfunction or corresponding data error.

[0064] If the consistency comparison test shows that the model is consistent, the test result report will include normal information about the substation's protection devices.

[0065] Step S4 specifically involves: filtering the substation protection devices corresponding to test result reports containing information about substation protection device faults or corresponding data errors, and then performing bay interconnection tests on the substation protection devices through a multi-bay synchronous test module.

[0066] Inter-bay interconnection testing comprises four parts: setpoint reading and writing, test device input / output, message reading and parsing, and device reset. A reasonable data structure can organize a single test operation into a test tree, where nodes represent different test steps. Editing the tree branches allows for editing the test operation. The protocol engine used in this invention, LibIEC, is an open-source protocol engine developed and maintained by MZ Automation. Its source code is open-source under the GPL license and can be used directly. It supports IEC61850, GOOSE, and SV protocols, and can directly perform IED-oriented setpoint reading and writing, pressure plate activation / deactivation, and message reading operations on the line stability control device. The multi-bay synchronous test module enables multi-bay synchronous input / output and signal input based on wireless interconnection technology, solving the problem of cross-bay relay protection and automation function verification during substation on-site commissioning.

[0067] In step S4, the method for interval interconnection testing is as follows:

[0068] Each tester is connected to the substation protection device. The tester outputs test signals synchronously at set time intervals to perform voltage telemetry tests and record voltage data. Then, the effective value of the voltage data is calculated based on the voltage data and added to the standard test report.

[0069] In this embodiment, 15 seconds is taken as the specified time interval. This time is much longer than the network latency, so it can be assumed that all instructions can be issued within this time, and the tester starts to output synchronously after 15 seconds.

[0070] To ensure low error in the recorded voltage data, the currently acquired voltage data and the voltage data acquired in the previous j times are further processed to fit the recorded voltage data with large deviations, thus obtaining the recorded voltage data.

[0071] The collected voltage data is processed by setting a voltage threshold N. If the current collected voltage data is greater than the voltage threshold N, the voltage data collected in the previous time is used as the current voltage data. The voltage data recorded at time t is obtained based on the voltage data collected at time t.

[0072] Among them, the voltage data x recorded at time t is obtained. t The expression is as follows:

[0073]

[0074] In the formula, u t-j+1 For the voltage data collected at time t-j+1, u t-j+2 For voltage data collected at time t-j+2, u t-1 The voltage data collected at time t-1, u t The voltage data collected at time t; εt-j+1 ε represents the weight of the voltage data collected at time t-j+1. t-j+2 ε represents the weight of the voltage data collected at time t-j+2. t-1 ε represents the weight of the voltage data collected at time t-1. t The weight of the voltage data collected at time t.

[0075] The expression for calculating the effective value Y of the voltage data is as follows:

[0076]

[0077] Where x1 is the voltage data recorded for the first time, x n Let ω1 be the voltage data recorded for the nth time, and ω1 be the weight of the voltage data recorded for the first time. n The weight for the nth voltage data recording;

[0078] The voltage data of this invention is corrected by weighting the voltage data, so that the calculated effective value of the voltage data is closer to the truth.

[0079] The weight ω of the voltage data recorded in the i-th time i The specific expression is:

[0080] ω i =α×x i +(1-α)x i-1

[0081] Wherein, α is a fixed attenuation value; in this embodiment, the value of α is set to 0.8.

[0082] The beneficial effects of this invention are as follows: This invention enables multi-bay synchronous addition of quantities and signals based on wireless interconnection technology, solving the problem of cross-bay relay protection and automation function verification during substation on-site commissioning. It reduces the workload of routine inspection work at the grassroots level, improves the efficiency of inspection work, and also ensures the safety of on-site operations and the standardization of routine inspection work.

[0083] The multi-bay synchronous test module of this invention enables on-site testers to create test plans for the protection devices of the protection bay substation according to test procedures and standards. The test plans for the protection devices of the protection bay substation can be edited quickly and efficiently, and test result reports can be generated.

[0084] This invention analyzes and compares multi-interval joint testing methods using digital protection testing, cross-interval backhaul testing, cross-interval multi-tester joint testing, cross-interval multi-tester coordination testing, and multi-tester fault playback testing, and develops a multi-interval synchronous testing module based on the Manufacturing Message Communication Standard (MMS).

[0085] In the description of this invention, it should be understood that the terms "center," "thickness," "upper," "lower," "horizontal," "top," "bottom," "inner," "outer," and "radial," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying the relative importance or the number of technical features implicitly specified. Therefore, a feature defined by "first," "second," and "third" may explicitly or implicitly include one or more of that feature.

Claims

1. A wireless data communication based substation multi-bay testing method, characterized in that, The method comprises the following steps: S1, parsing SCD information of a to-be-tested substation through a test terminal module, and generating IED information of the to-be-tested substation; S2, connecting with a protection device of the to-be-tested substation through a communication submodule, and obtaining a device data model; S3, performing consistency comparison test on the device data model according to the IED information, and obtaining a test result report; S4, based on the test result report, performing interval interconnection test through a multi-interval synchronous test module, and obtaining a standard test report; The method of interval interconnection test is specifically as follows: Each test instrument is connected with the screened substation protection device respectively, voltage remote measurement test is performed through the test instrument at a set time interval, and a test signal is synchronously outputted, so as to obtain recorded voltage data; then, the effective value of the voltage data is calculated according to the voltage data, and the effective value is added to the standard test report; The method of obtaining the recorded voltage data is as follows: The voltage threshold N is set to process the collected voltage data, if the current collected voltage data is greater than the voltage threshold N, then the previous collected voltage data is taken as the current voltage data; according to t the voltage data recorded at the moment, the voltage data recorded at the moment is obtained t the voltage data recorded at the moment wherein, obtaining t Voltage data recorded at the time The expression is specifically: wherein is the voltage data collected at time is the voltage data collected at time is the voltage data collected at time is the voltage data collected at time is the voltage data collected at time is the voltage data collected at time is the voltage data collected at time is the voltage data collected at time 2. The wireless data communication based substation multi-bay test method of claim 1, wherein, The step S1 is specifically as follows: Based on IEC61850 protocol, value reading and writing operation and pressing plate operation are performed on the protection device of the to-be-tested substation through the test terminal module, so as to read positive differential action current value and line positive sequence sensitivity angle value; then, remote measurement precision test is performed on SCD information of the to-be-tested substation according to set three-phase test parameter output and operation duration, so as to obtain IED information of the to-be-tested substation.

3. The wireless data communication based substation multi-bay test method of claim 1, wherein, The step S3 comprises the following sub-steps: S31, modeling the IED information of the to-be-tested substation according to IEC61850 protocol, so as to obtain an IED device data model; S32, performing consistency comparison test on the IED device data model and the device data model, so as to obtain a test result report; If the result of the consistency comparison test is that the models are inconsistent, the test result report contains information of protection device fault or corresponding data error of the substation; If the result of the consistency comparison test is that the models are consistent, the test result report contains normal information of the protection device of the substation.

4. The wireless data communication based substation multi-bay test method of claim 3, wherein, The step S4 is specifically as follows: the test result report containing information of protection device fault or corresponding data error of the substation is screened, and then interval interconnection test is performed on the substation protection device through the multi-interval synchronous test module, so as to obtain a standard test report.

5. The wireless data communication based substation multi-bay test method of claim 4, wherein, The expression of the calculated voltage data effective value Y is specifically: wherein, is the voltage data of the first recording, is the voltage data of the second recording, n is the voltage data of the first recording, is the weight of the first recording voltage data, is the weight of the second recording voltage data, n is the weight of the second recording voltage data; The first i weight of the recorded voltage data The expression is specifically: wherein is a fixed attenuation value.

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