CN103105550B - A kind of intelligent relay protection device detection method and system - Google Patents

Abstract

The invention provides an intelligent relay protection device detection method and system, aiming at the fact that the existing technology cannot effectively detect the dynamic performance of the relay protection device at the intelligent substation site, from the digitalization and information sharing of the secondary system of the intelligent substation Based on the characteristics of the system, a detection method is proposed, which uses the digital simulation system as the data source and multiple digital relay protection testers work synchronously as the detection means, and builds an intelligent relay protection device detection system. The invention can construct a simulation model in the laboratory according to the actual electrical topology structure and equipment parameters of the intelligent substation, simulate various operating conditions that may occur in the substation, perform simulation calculations and convert them to obtain a temporary model with a high similarity to the actual operating conditions. State test data, "playback" output transient test data at the smart substation site, and carry out dynamic performance test of relay protection device and verification of protection setting value.

Description

A detection method and system for an intelligent relay protection device

technical field

The invention relates to the technical field of digital-analog hybrid simulation test and intelligent substation test, in particular to a detection method and system for an intelligent relay protection device.

Background technique

The construction of smart grid has become a national development strategy, and it is imperative for smart substations to gradually replace traditional substation integrated automation substations; at present, smart substations have entered the stage of promotion and application. Compared with the traditional substation, the structure of the secondary equipment of the smart substation and the information transmission method between the equipment have undergone great changes, resulting in corresponding changes in the detection technology of the intelligent secondary equipment. There are three main detection methods and systems for existing intelligent relay protection devices, as follows:

1. Digital relay protection tester

The digital relay protection tester is currently the most widely used intelligent relay protection device detection device. It can output digital messages in compliance with IEC61850 and IEC60044-8 specifications, and can add harmonics, DC components and other components to the output signal. The intelligent relay protection device is tested on site in the smart substation, which has the advantages of easy portability, multiple detection functions, and wide use. However, the test data output by the digital relay protection tester cannot simulate the transient process of electrical quantities under some working conditions in substations, so it is impossible to carry out effective dynamic performance tests on intelligent relay protection devices.

2. Digital protection dynamic model test system based on IEC61850 standard

The dynamic model laboratory is designed and built according to the actual power system model, which can provide a relatively close to the actual operating environment. It is a good platform for testing relay protection devices. The digitally transformed dynamic model test system can convert test data into compliance with IEC61850 specifications Carry out dynamic performance testing and research on intelligent secondary equipment. However, the dynamic model test system requires a large investment and occupies a large area. Due to the limitation of the structure and scale of the test system, the test objects have relatively large limitations, and the test flexibility is poor, and it is impossible to carry out testing work in the smart substation site.

3. Digital simulation test system based on IEC61850 standard

The digital simulation system based on IEC61850 can build a simulation model according to the actual electrical topology structure and equipment parameters of the smart substation, simulate various operating conditions that may occur in the substation, and perform dynamic performance detection on the intelligent secondary equipment; the topology structure and equipment parameters of the substation When changes occur, the model can be modified in the simulation software without adding or changing hardware devices, and the flexibility is high. However, the test system can only carry out detection work in the laboratory.

In summary, although the digital relay protection tester can carry out steady-state performance tests on intelligent relay protection devices at the substation site, it cannot carry out effective dynamic performance tests; the digital protection dynamic model test system based on the IEC61850 standard and the digital Although the simulation test system can carry out dynamic performance tests on intelligent relay protection devices, it cannot carry out corresponding tests in the field of intelligent substations.

Contents of the invention

Aiming at the current situation that the existing detection methods and detection equipment cannot perform effective dynamic performance detection on the relay protection device at the intelligent substation site, the present invention proposes a detection method for the intelligent relay protection device and establishes a detection system. The method and system can build a simulation model according to the electrical topology structure and equipment parameters of the smart substation, simulate various operating conditions that may occur on the substation site, perform simulation calculations and convert them to obtain transient test data with a high degree of similarity to the actual operating conditions , the dynamic performance detection of relay protection devices and the verification of protection fixed values are carried out on the site of intelligent substations. This method and system solve the defects existing in the current detection methods.

The invention provides a detection method for an intelligent relay protection device, comprising the following steps:

Step 1: Collect on-site data of smart substations. The on-site data include substation topology, primary equipment parameters, and current/voltage transformer ratio, etc., and formulate corresponding test plans according to testing requirements. The contents of the test plans include testing items, testing Range, fault point setting, fault type and test output data type;

Step 2: Construct the primary system simulation model of the smart substation according to the field data, set the simulation data output channel, and ensure that the simulation output test data conforms to the test requirements;

Step 3: In the digital simulation test system, use the simulation model to perform simulation calculations on various operating conditions of the smart substation, and output transient simulation data;

Step 4: Convert the transient simulation data into message data conforming to the IEC61850 protocol, which is message data that can be recognized by the substation protection device, and may be data conforming to the IEC61850-9-2 protocol;

Step 5: Import the substation configuration file (Substation Configuration Description, SCD) into the storage device, and store the message data generated in the above steps according to the configuration of the SCD. If necessary, it can be converted into a COMTRADE format recording file for storage. The data is the transient test data;

Step 6: Carry the stored data to the test site and transfer to the digital relay protection tester equipment involved in the test work;

Step 7: Use the clock synchronization device to send a time synchronization signal to the digital relay protection tester participating in the test to ensure that the test data can be output synchronously;

Step 8: Configure the output of each digital relay protection tester according to the substation-wide configuration file (SCD), and under the coordination of the synchronization signal, output the transient test data synchronously at the smart substation site; output test data can be selected according to the detection requirements Type: When it is necessary to output test data to the corresponding merging unit, set the tester to output message data conforming to the IEC60044-8 protocol. If it is necessary to output the test data to the corresponding intelligent relay protection device, the output conforms to IEC61850-9- 2 protocol message data;

Step 9: Assess the dynamic performance of the intelligent relay protection device, check the relevant protection settings and check the correctness of the secondary circuit.

In the above-mentioned intelligent relay protection device detection method, the step 9 is specifically: judging whether to detect the secondary circuit of the whole station or the joint debugging of the whole station,

If the judgment result is yes, go to step 91: the digital relay protection tester outputs the message data conforming to the IEC60044-8 protocol to the merging unit, and then go to step 92: check the dynamic performance of the intelligent relay protection device, protection setting and Detection of the secondary circuit;

If the judgment result is no, go to step 93: the digital relay protection tester outputs message data conforming to the IEC61850-9-2 protocol to the intelligent relay protection device, and then go to step 94: check the dynamic performance and protection settings of the protection device. value detection.

In the intelligent relay protection device detection method as described above, the simulation step size of the transient simulation data in the step 1 is not more than 250 microseconds; the sampling rate of the message data generated by conversion in the step 4 is 80 points /cycle; the sampling rate of the wave recording data generated in step 5 is not lower than 80 points/cycle.

The invention also provides an intelligent relay protection device detection system, which includes a digital simulation unit, a signal conversion unit, a data storage unit and a test output unit. in:

The digital simulation unit is composed of a digital simulation system (for example: ADPSS, RTDS, etc.) or digital simulation software (for example: PSCAD/EMTDC, EMTP, etc.), and is used to construct a simulation model according to the electrical topology structure and equipment parameters of the substation, and simulate the substation Perform simulation calculations to generate transient simulation data for various operating conditions that may occur on site.

The signal conversion unit is used to change the transient simulation data output by the digital simulation unit into message data conforming to the IEC61850-9-2 protocol (a message data format that can be recognized by substation secondary equipment);

The data storage unit is used to store the message data generated by the signal conversion unit, and this unit should have the ability to convert the message data conforming to the IEC61850-9-2 protocol into a wave recording file in the COMTRADE format;

The clock synchronization unit is used to synchronize the time of multiple digital relay protection testers to ensure that all testers participating in the detection send out test data synchronously;

The detection output unit is composed of a plurality of digital relay protection testers. Under the coordination of the synchronous clock, the testers participating in the detection will synchronously analyze the test data transferred from the data storage unit and output it to the detection point. detection work. The type of output detection signal can be selected according to the detection target and detection requirements. If it is necessary to output the test data to the corresponding merging unit, set the tester to parse out the message data of the IEC60044-8 protocol. If it is necessary to output the test data to the corresponding intelligent relay For electrical protection devices, the message data of the IEC61850-9-2 protocol is analyzed.

In the above-mentioned intelligent relay protection device detection system, the signal conversion unit is composed of a physical interface box, a power amplifier, a collector and a merging unit, and the transient simulation data output by the digital simulation unit is converted into a small voltage through the physical interface box signal; the power amplifier amplifies the small voltage signal into the secondary side voltage/current signal of the electromagnetic transformer; the collector converts the secondary side voltage/current signal of the electromagnetic transformer into message data conforming to the IEC60044-8 (FT3) protocol ; Import the SCD configuration file into the merging unit, and convert the IEC60044-8 protocol message data output by the collector into the corresponding IEC61850-9-2 message data according to the SCD configuration file.

The advantages of the intelligent relay protection device detection method and system based on the analog fault playback principle of the present invention are:

(1) The detection method and system of the present invention can carry out the verification work of the dynamic performance of the relay protection device and the protection fixed value in the intelligent substation, and the method and system make up for the shortcomings of the current detection method;

(2) The detection method and system of the present invention can construct a simulation model according to the electrical topology structure and equipment parameters of the smart substation, simulate various operating conditions that may occur in the substation, perform simulation calculations and convert to obtain the similarity with the actual operating conditions Higher transient test data;

(3) The detection system can use multiple digital relay protection testers to carry out detection work synchronously under the coordination of the synchronous clock; the tester simulates all remote modules on the site of the smart substation, and outputs test data to the corresponding merging unit, and at the same time Output the test data to the whole station of the substation, and carry out the collaborative detection of the whole station.

(4) It can realize the verification of the protection setting value and the coordination relationship between the protection setting values of the protection device at the site of the intelligent substation.

(5) Combining the advantages of powerful digital simulation system and convenient fault setting with the widely used characteristics of the protection tester, the detection system is simple in structure, convenient in detection and low in cost.

Description of drawings

Fig. 1 is the work flowchart of the detection method of the intelligent relay protection device of the present invention;

Fig. 2 is the structural representation of the detection system of the intelligent relay protection device of the present invention;

Fig. 3 is a schematic diagram of the main wiring of the primary system and the installation position of the equipment in one embodiment of the present invention;

Among them, ECT means electronic current transformer, EVT means electronic voltage transformer, MU means merging unit, ST means intelligent terminal, and K means fault point;

Fig. 4 is a schematic diagram of the detection system structure and detection signal transmission in one embodiment of the present invention.

Detailed ways

The technical solutions in the present invention will be clearly and completely described below in conjunction with specific embodiments.

The schematic diagram of the main wiring and equipment installation position of the primary system of the smart substation in an embodiment of the present invention is shown in Figure 3. The smart substation is a 220kV smart substation test system, the system is equipped with a background monitoring device, and a single set of secondary equipment is configured, and The protection device adopts the direct mining and direct jumping networking mode; the on-site process layer equipment of the intelligent substation includes 6 electronic voltage transformers (EVT), 6 electronic current transformers (ECT), 7 merging units (MU), It consists of 6 intelligent terminals (ST), and the installation position and corresponding relationship of each process layer equipment are shown in Figure 3.

The test system needs to carry out the secondary circuit detection of the whole station and the joint debugging of the secondary system, so the test plan is formulated as follows:

(1) Use 7 digital relay protection testers (number PNF1-PNF7) of the same model (PNF-801) to simulate 12 remote modules (ECT1-ECT6, EVT1-EVT6) to 7 merging units (MU1) -MU7) output test data, the test data format conforms to the IEC60044-8 protocol.

(2) The embodiment of the present invention mainly examines the low-voltage side backup protection setting and its coordination with the main transformer protection setting. Therefore, various types of short-circuit faults occur at different positions on the main transformer low-voltage side (fault points are set as shown in Figure 3 K1-K6), detect the transient characteristics of the protection and check the low-voltage side backup protection and main transformer protection settings.

(3) The data storage unit in the detection system needs to convert the obtained IEC61850-9-2 message data into a COMTRADE format recording file.

One embodiment of the intelligent relay protection device detection system of the present invention includes a digital simulation unit, a signal conversion unit, a data storage unit, a time synchronization unit and a test output unit. The schematic diagram of the detection system structure and detection signal transmission of the intelligent relay protection device is shown in Figure 4, where:

The digital simulation unit is composed of ADPSS simulation system, including ADPSS simulation software, server hardware, terminal workstation and other auxiliary equipment. According to the primary equipment parameters of the smart substation (including the current/voltage transformer ratio and installation location), the simulation model is constructed in the ADPSS simulation system, the test plan is formulated, the simulation calculation is performed, and the transient simulation data (digital quantity) is output. The test plan includes detection items, detection range, fault point and fault type, and test output data type, etc. For example, the fault point selection is K1-K6 as shown in Figure 3.

The signal converting unit is composed of a physical interface box, a power amplifier, a collector and a merging unit. The transient simulation data (digital quantity) output by the digital simulation unit is converted into a small voltage signal (0-10V) through the physical interface box; the power amplifier amplifies the small voltage signal into the secondary side voltage/current signal of the electromagnetic transformer (voltage range is 100V, and the current range is 5A/1A); the collector converts the secondary side voltage/current signal of the electromagnetic transformer into message data conforming to the IEC60044-8 (FT3) protocol; imports the SCD configuration file into the merging unit, according to the SCD The configuration file converts the IEC60044-8 protocol message data output by the collector into the corresponding IEC61850-9-2 message data.

Described data storage unit, mainly is made up of network analyzer, and this network analyzer has message analysis and fault recording function; In the present embodiment, network analyzer converts the IEC61850-9-2 message data of signal conversion unit output Store the wave recording files in COMTRADE format.

The test output unit includes 7 digital relay protection testers of the same model. After importing the SCD configuration file and wave recording file into the digital relay protection tester, configure the data channel; after B code time synchronization, all 7 testers are set to start at zero crossing, and synchronously output the test data conforming to the IEC60044-8 protocol to The merging unit (MU1-MU7), the one-to-one correspondence between the digital relay protection test and the merging unit is shown in Figure 4.

The clock synchronization unit includes a synchronization clock system and several optical fibers. The clock synchronization system sends time synchronization signals to 7 digital relay protection testers in a B code time synchronization mode.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any changes or substitutions that can be easily imagined by those skilled in the art within the technical scope disclosed in the present invention, All should be covered within the protection scope of the present invention.

Claims (4)

1. an intelligent relay protection device detection method, is characterized in that comprising the following steps:

Step 1: the in-situ data collecting intelligent substation, described in-situ data comprises topological structure, the device parameter of intelligent substation, and formulate corresponding testing program according to detection demand, the content of testing program comprises test item, sensing range, trouble spot setting, fault type and test and exports data type;

Step 2: build intelligent substation data primary system realistic model with reference to in-situ data, emulated data output channel is set, ensure that simulation data test data conforms to test demand;

Step 3: in Digital Simulation pilot system, uses described realistic model to carry out simulation calculation to the various operating condition of intelligent substation, exports transient state simulation data;

Step 4: transient state simulation data is converted to the message data meeting IEC 61850-9-2 agreement;

Step 5: the message data meeting IEC 61850-9-2 agreement above step generated stores, and the recorded wave file as required described message data being converted to COMTRADE form stores, and the data of storage are transient test data;

Step 6: the transient test data of storage are carried into test site, unloading is in the digital relay protection tester participating in test job;

Step 7: signal when utilizing clock synchronization device to send pair to the digital relay protection tester participating in test job, guarantees that test data can synchronism output;

Step 8: configure the output of each digitizing relay-protection tester according to intelligent substation configuration file of entirely standing, time described in step 7 pair signal coordination under synchronism output transient test data; The type outputed test data can be selected: when needing the merge cells outputed test data to correspondence according to detection demand, digital relay protection tester is set and exports the message data meeting IEC 60044-8 agreement, if need to output test data to the intelligent relay protection device of correspondence, then export the message data meeting IEC 61850-9-2 agreement;

Step 9: the dynamic property of examination intelligent relay protection device, the relevant correctness protected definite value and detect secondary circuit of verification.

2. intelligent relay protection device detection method as claimed in claim 1, is characterized in that: described step 9 is specially: judge whether to detect full station secondary circuit or uniting and adjustment of entirely standing,

If judged result is yes, then perform step 91: the output of digital relay protection tester meets the message data of IEC 60044-8 agreement to merge cells, then performs step 92: the detection carrying out intelligent relay protection device dynamic property, protection definite value and secondary circuit;

If judged result is no; then perform step 93: the output of digital relay protection tester meets the message data of IEC 61850-9-2 agreement to intelligent relay protection device, then performs step 94: the detection carrying out intelligent relay protection device dynamic property, protection definite value.

3. an intelligent relay protection device detection system, is characterized in that: comprise Digital Simulation unit, signal conversion unit, data storage cell, clock synchronization unit and test output unit, wherein:

Described Digital Simulation unit, for building realistic model, contingent various operating condition in imitating substation according to the electric topology structure of intelligent substation and device parameter, carrying out simulation calculation and exporting transient state simulation data;

Described signal conversion unit, is converted to for the transient state simulation data exported by Digital Simulation unit the message data meeting IEC 61850-9-2 agreement;

Described data storage cell, stores for the message data generated by signal conversion unit, and this unit should have the ability message data meeting IEC 61850-9-2 agreement being converted to the recorded wave file of COMTRADE form;

Described clock synchronization unit, during for carry out multiple stage digital relay protection tester pair, ensures that all testers participating in detecting synchronously send test data;

Described test output unit, be made up of multiple stage digital relay protection tester, participate in test digital relay protection tester pair time signal coordination under, after the message data stored in data storage cell is resolved, synchronism output test data, to check point, carries out testing;

The test data that described test output unit exports has two classes; the type outputed test data can be selected: when needing to export test data to merge cells according to detection demand; digital relay protection tester is set and exports the message data meeting IEC 60044-8 agreement; if need test data to be exported to corresponding intelligent relay protection device, then export the message data meeting IEC 61850-9-2 agreement.

4. intelligent relay protection device detection system as claimed in claim 3, it is characterized in that: described signal conversion unit is made up of physical interface case, power amplifier, collector and merge cells, the transient state simulation data that Digital Simulation unit exports is converted to small voltage signal through physical interface case; Small voltage signal is enlarged into electromagnetic transformer secondary side voltage/current signals by power amplifier; Electromagnetic transformer secondary side voltage/current signals is converted to the message data meeting IEC 60044-8 (FT3) stipulations by collector; Import SCD configuration file in merge cells, the IEC 60044-8 stipulations message data exported by collector according to SCD configuration file is converted to corresponding IEC 61850-9-2 message data.