CN110672945A - Line protection automatic test system based on real-time digital simulation system - Google Patents
Line protection automatic test system based on real-time digital simulation system Download PDFInfo
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Abstract
The invention relates to a line protection automatic test system based on a real-time digital simulation system, which is used for automatically testing a line protection device and comprises an RTDS fault waveform simulation module and an MATLAB fault waveform analysis module, wherein the RTDS fault waveform simulation module executes different script programs according to different test types, traverses a plurality of fault types, carries out fault waveform simulation and generates a fault waveform file with a fixed format, the MATLAB fault waveform analysis module reads curve data and a name of the fault waveform file, compares waveform change information and waveform name information, judges whether a protection action is correct or not and outputs a test result, and the RTDS fault waveform simulation module and the MATLAB fault waveform analysis module realize data transmission of the fault waveform file through an interface of a TCP/IP communication protocol Good applicability and convenient use.
Description
Technical Field
The invention relates to the field of relay protection, in particular to a line protection automatic test system based on a real-time digital simulation system.
Background
With the continuous expansion of the power grid scale, the number of new equipment and equipment upgrading and network access tests is increased year by year, particularly for line protection tests, the operation times are multiple, the task amount is large, and most of the new equipment and the equipment are repetitive tests, and the precision of reading test results by operators is not high, so that the test efficiency is reduced. The existing test means are increasingly difficult to meet the test requirements of distribution automation devices and protection devices, realize automatic test of network access test mass tasks, obtain automatic test results, and improve the utilization efficiency of real-time digital simulation systems and the test accuracy, which becomes a critical affair.
Currently, various departments and institutions, colleges and universities and enterprise units develop a lot of successful work around the real-time digital simulation technology of the power grid and the application thereof, and obtain numerous technical achievements. However, the existing automatic test system has single test items, few factors considered in the model, certain limitation, limited applicability and certain limitation on software functions. The testing system is not truly automated, still needs a great deal of manual operation, and cannot fully improve the utilization efficiency of the real-time simulation system. Therefore, it is of great significance to develop a set of truly automatic test systems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a line protection test system based on real-time digital simulation and an implementation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a line protection automatic test system based on a real-time digital simulation system is used for automatically testing a line protection device and comprises an RTDS fault waveform simulation module and an MATLAB fault waveform analysis module, wherein the RTDS fault waveform simulation module executes different script programs according to different test types, traverses a plurality of fault types, carries out fault waveform simulation and generates a fault waveform file with a fixed format, the MATLAB fault waveform analysis module reads curve data and a name of the fault waveform file, compares waveform change information and waveform name information, judges whether a protection action is correct or not and outputs a test result, and data transmission of the fault waveform file is realized between the RTDS fault waveform simulation module and the MATLAB fault waveform analysis module through an interface of a TCP/IP communication protocol.
Under the condition of determining the test type, the fault waveform simulation step comprises the following steps:
1) locking and recording waves;
2) setting corresponding fault type parameters according to the fault type cycle, assigning values to the sliding block and the drive plate, and transforming the fault type;
3) resetting the switch position and unlocking the recording;
4) triggering fault generation, starting fault waveform simulation, and storing the obtained waveform as a fault waveform file with a fixed format;
5) judging whether a fault type cycle under the test type is traversed, if so, ending the test, otherwise, entering the next cycle, and returning to the step 1);
the test types comprise single fault tests and transfer fault tests.
Under a single fault test type, the fault type cycle comprises a cycle of fault duration, a cycle of fault points and a cycle of fault phase, and the fault type parameters comprise the fault duration, the fault phase and the fault points; and under the transfer fault test type, the fault type cycle comprises a cycle of a fault point, a cycle of a first fault phase, a cycle of a second fault phase and a cycle of fault interval time, and the fault type parameters comprise fault duration, a first fault phase, a second fault phase, a first fault position, a second fault position and fault interval time.
Under a single fault test type, the fault duration comprises a permanent fault and a transient fault; under the transfer fault test type, the fault duration is instantaneous fault.
The curve data of the fault waveform file comprises waveform rising edges and falling edges, and sudden change occurrence time of semaphore, wherein the waveform rising edges and the falling edges are used for judging triggering of faults, sending of protection signals and tripping of a circuit breaker, the sudden change of the semaphore is used for judging whether protection acts, and the sudden change occurrence time is used for judging the time of protection action.
The fixed-format fault waveform file is a COMTRADE format file, the COMTRADE format file comprises two subfiles of an 'x' cfg 'subfile and an' x 'dat' subfile, the 'x' cfg 'subfile stores a waveform name, generation time and a data format, and the' x 'dat' subfile stores curve data of the fault waveform file.
The waveform name of the single fault test comprises a test sequence number, fault duration, a fault position and a fault phase, and the waveform name of the transfer fault test comprises a test sequence number, fault duration, a first fault position, a first fault phase, interval time, a second fault position and a second fault phase.
The test result is a word file generated by MATLAB, if the test result is correct action, the output conclusion in the word file is qualified, if the test result is operation refusal, misoperation or protection time is not in the set qualified range, the word file is marked with error, and corresponding error item prompt is output.
Compared with the prior art, the invention has the following advantages:
1) the test accuracy is high, efficient: the RTDS and the MATLAB are jointly used, so that the automation of fault waveform simulation and fault waveform analysis is completed, the network access automatic test function of the equipment is realized, and compared with a manual test, the efficiency is higher, and the reading precision of an experimental result is higher;
2) the test items are various: the method can test two test types including single fault and transfer fault, the fault types in each type are various, 100 fault types exist under the single fault test, 320 fault types exist under the transfer fault test, multiple factors are considered in the model, and the adaptability is high;
3) the use is convenient: the automatic test system develops a MATLAB-based waveform analysis program aiming at the waveform analysis generated in the test process, realizes the data transmission of an MATLAB program package and a script program by utilizing an interface of an MATLAB and a real-time digital simulation system script program file, completes the analysis and judgment of the waveform, and can automatically generate a test report in a WORD form, so that the use is convenient.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a flow chart of the system operation of the present invention;
FIG. 3 is a flow chart of automatic testing under single failure test;
FIG. 4 is a flow chart of automatic testing under a transfer failure test;
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
As shown in the figure, the invention provides a line protection automatic test system based on a real-time digital simulation system, which is used for automatically testing a line protection device and comprises an RTDS fault waveform simulation module and an MATLAB fault waveform analysis module, wherein the RTDS fault waveform simulation module executes different script programs according to different test types to simulate fault waveforms and generate a fault waveform file with a fixed format, the MATLAB fault waveform analysis module reads curve data and a name of the fault waveform file, compares waveform change information and waveform name information, judges whether a protection action is correct or not and outputs a test result, and data transmission of the fault waveform file is realized between the RTDS fault waveform simulation module and the MATLAB fault waveform analysis module through an interface of a TCP/IP communication protocol.
The script language is the basis for RTDS to compile batch files and perform automatic simulation tests, and can realize automatic operation of simulation models. By running the scripting language program, the RTDS can complete the simulation process according to the established action steps. In the process of executing the script file, the RTDS can automatically store the information such as the waveform and the like required to be recorded in the test without the intervention of testers, thereby laying the foundation for the automatic test of line protection. The RTDS scripting language is mainly edited in a Runtime interface of the RTDS, and the aim is to facilitate the testing of the relay protection equipment and the automation equipment thereof. There are two ways to edit: one is that the script language is used for self-writing in a text box of the newly-built script language; and the other method is to record the operation steps of the testers by using the functions in the batch processing tool boxes and generate a script language file. The invention adopts a first method, namely, a script file is newly built, and codes are written according to a to-be-completed test project.
Aiming at different fault test types and different programming codes, the corresponding flow chart is designed to improve the programming efficiency and precision. As shown in fig. 3 and fig. 4, fig. 3 is a flow chart of an automatic test under a single fault test, and it can be known from the flow chart that wave locking and recording are firstly required to prevent interference, then fault parameter recording and switch resetting are performed, and then operations such as test, wave unlocking and recording, simulation result saving and the like can be performed. Fig. 4 is a flow chart of automatic test under a transfer fault test, the transfer fault is different from a single fault in that the transfer fault needs to be set every cycle, and in the parameter entry, because the transfer fault only needs to consider a transient fault in view of duration, two steps of setting a transition fault and setting a fault interval time need to be added into the flow chart, and finally, the formed result is as shown in fig. 4.
Under the condition of determining the test type, the fault waveform simulation step comprises the following steps:
1) locking and recording waves;
2) setting corresponding fault type parameters according to the fault type cycle, assigning values to the sliding block and the drive plate, and transforming the fault type;
3) resetting the switch position and unlocking the recording;
4) triggering a fault, starting fault waveform simulation, and storing the obtained waveform as a fault waveform file with a fixed format;
5) judging whether the fault type cycle of the test type is traversed or not, if so, ending the test, otherwise, entering the next cycle, and returning to the step 1);
the test types include single failure tests and transfer failure tests.
One, single fault test
The single fault automatic test content is that when a certain point in the test system is in a ground short circuit, the protection should meet the following requirements: when an internal fault occurs, the protection is not refused to operate, and when an external fault occurs, the protection is not mistakenly operated. For transient faults, the action time should be less than 30ms, otherwise, the fault is considered to be disqualified; for a permanent fault, the first action time should be less than 30ms, and the post reclosing protection should be able to trip the breaker.
The single fault test can be divided into transient fault and permanent fault from fault duration, 5 fault points from fault positions and 10 short-circuit faults from fault phases, and 100 fault types are required to be tested. Three cycles are constructed according to the above three classification modes to realize the traversal of a single fault, including a cycle of fault duration, a cycle of fault point and a cycle of fault phase, a cycle of realizing permanent fault and transient fault, a cycle of fault positions f1 to f5, a cycle of fault phase such as A phase fault and B phase fault.
In each cycle, before the test type is changed, the recording should be locked, and after the fault type parameters are completely set, the recording is opened to perform simulation so as to ensure that the recording of the waveform is not influenced in the process of changing the parameters.
After the wave is recorded, the sliding block and the driving plate are assigned, the value of the variable is changed in each circulation, a single fault type parameter is set, and the conversion of the test type is realized, wherein the single fault type parameter comprises fault duration, fault phase and fault point.
After the failure time, the failure point and the failure phase are set, the reset button is pressed by using a Pushbutton command, the switch position is reset, and the initial state of the test is ensured. The simulation of the fault can be completed by pressing the fault trigger button 'flt'.
The simulation of single fault and the simulation of fault waveform are completed, and the fault waveform can be saved in a COMTRADE format by utilizing a CommrandPlotSave command. It should be noted that, before saving the waveform, the waveform is paused for a period of time, and then is saved after the waveform is stabilized. The waveform is stored by using comradeplotsave statement, the second quote is the path and file name to be stored, the naming rule is "test sequence number + fault duration (instantaneous or permanent) + fault location + fault phase", take the example that instantaneous a-phase grounding fault occurs at F1, and the file name is "1. instantswf1an. cfg".
Second, transfer failure test
The transfer fault refers to an action condition of protection when a short circuit occurs at a certain point on a line and the fault is developed to other places from the original position after a period of time, and usually the fault outside the area is converted into the fault inside the area after a period of time or the fault inside the area is converted into the fault outside the area after a period of time needs to be tested. At this time, the protection should act after the in-zone fault occurs.
The transfer fault test only needs to consider transient faults from the aspect of duration, 4 faults are divided from fault points, namely F1 to F4, F4 to F1, F3 to F5 and F5 to F3, 10 short-circuit faults are divided from the fault points in one fault respectively, and 4 transition times are divided from the fault interval time, so that 320 fault types are totally needed to complete the test. And constructing four cycles according to the four classification modes to realize the traversal of the transfer fault, wherein the four cycles comprise a fault point cycle, a first fault phase cycle, a second fault phase cycle and a fault interval time cycle.
In each cycle, before the test type is changed, the recording should be locked, and after the fault type parameters are completely set, the recording is opened to perform simulation so as to ensure that the recording of the waveform is not influenced in the process of changing the parameters.
After the wave is recorded by the lock, the slide block and the drive plate are assigned, and transfer fault type parameters including fault duration, a first fault phase, a second fault phase, a first fault position, a second fault position and fault interval time are set in each cycle.
The rest of operations, such as switch position resetting, fault triggering, etc., are the same as the setting method in the single fault test, and are not described herein again.
The naming rule of the transfer fault waveform file is "test serial number + fault duration (instantaneous or permanent) + first fault position + first fault phase + delay + fault interval time (in ms) + to + second fault position + second fault phase.cfg", taking as an example that the occurrence of an instantaneous a-phase ground fault at F1 is converted into the occurrence of a B-phase ground fault at F4 over 10ms, and the file name is "1. instantswf1delay1toswf4bn.cfg".
Analyzing the simulation result of the RTDS by using the MATLAB inevitably involves the data transmission problem of the script and the MATLAB, and the RTDS provides a method for interfacing with the MATLAB: an interface based on a TCP/IP communication protocol is established between the RTDS and the MATLAB through a jtcp function in the MATLAB, so that data can be transmitted between the RTDS and the MATLAB in a bidirectional way.
Through the ListenOnPort () command in the script, the RTDS can establish an interface based on the TCP/IP communication protocol with MATLAB. When this command is executed in the script, the RSCAD becomes a virtual TCP server, which opens a port to wait for external commands, which is customized in the ListenOnPort () statement. The MATLAB program as a virtual client requests communication with the port by using a jtcp function, and if the ports are consistent, the communication is established. Once communication is established, data may be transferred in a format between the RTDS and MATLAB.
In the script file of the automatic test, the RTDS has saved the waveform of each trial in a "waveform file" folder, and reads the saved waveform file in COMTRADE format through a "dir" statement in MATLAB. The COMTRADE format file comprises two subfiles of 'cfg' and 'dat', the 'cfg' subfile stores the waveform name, the generation time and the data format, and the 'dat' subfile stores the curve data of the fault waveform file. Therefore, when analyzing waveform data, only the data in the ". about.dat" file needs to be read.
The curve data of the fault waveform file comprises waveform rising edges and falling edges, and sudden change occurrence time of the semaphore, wherein the waveform rising edges and the falling edges are used for judging triggering of faults, sending of protection signals and tripping of a circuit breaker, the sudden change of the semaphore is used for judging whether protection acts, and the sudden change occurrence time is used for judging the time of protection action.
In the word document, if the test result is correct action, the conclusion is 'qualified' in the word document, and if the test result is refusal to operate, misoperation or the protection time is not in the set qualified range, the word document marks 'error' and outputs corresponding error item prompt.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A line protection automatic test system based on a real-time digital simulation system is used for automatically testing a line protection device and is characterized by comprising an RTDS fault waveform simulation module and an MATLAB fault waveform analysis module, wherein the RTDS fault waveform simulation module executes different script programs according to different test types, traverses a plurality of fault types, carries out fault waveform simulation and generates a fault waveform file with a fixed format, the MATLAB fault waveform analysis module reads curve data and a name of the fault waveform file, compares waveform change information and waveform name information, judges whether a protection action is correct and outputs a test result, and the RTDS fault waveform simulation module and the MATLAB fault waveform analysis module realize data transmission of the fault waveform file through an interface of a TCP/IP communication protocol.
2. The automatic line protection test system based on the real-time digital simulation system as claimed in claim 1, wherein under the condition of determining the test type, the fault waveform simulation step comprises:
1) locking and recording waves;
2) setting corresponding fault type parameters according to the fault type cycle, assigning values to the sliding block and the drive plate, and transforming the fault type;
3) resetting the switch position and unlocking the recording;
4) triggering fault generation, starting fault waveform simulation, and storing the obtained waveform as a fault waveform file with a fixed format;
5) and judging whether the fault type cycle under the test type is traversed, if so, ending the test, otherwise, entering the next cycle, and returning to the step 1).
3. The automatic line protection test system based on the real-time digital simulation system as claimed in claim 2, wherein the test types include single fault test and transfer fault test.
4. The automatic line protection test system based on the real-time digital simulation system according to claim 3, wherein under a single fault test type, the fault type cycle comprises a cycle of fault duration, a cycle of fault point and a cycle of fault phase, and the fault type parameters comprise fault duration, fault phase and fault point; and under the transfer fault test type, the fault type cycle comprises a cycle of a fault point, a cycle of a first fault phase, a cycle of a second fault phase and a cycle of fault interval time, and the fault type parameters comprise fault duration, a first fault phase, a second fault phase, a first fault position, a second fault position and fault interval time.
5. The automatic line protection test system based on the real-time digital simulation system as claimed in claim 4, wherein, in a single fault test type, the fault duration comprises a permanent fault and a transient fault; under the transfer fault test type, the fault duration is instantaneous fault.
6. The automatic line protection test system based on the real-time digital simulation system as claimed in claim 1, wherein the curve data of the fault waveform file comprises waveform rising edges and falling edges and sudden change occurrence time of the semaphore, the waveform rising edges and the falling edges are used for judging triggering of the fault, sending of the protection signal and tripping of the circuit breaker, the sudden change of the semaphore is used for judging whether the protection is operated, and the sudden change occurrence time is used for judging the time of the protection operation.
7. The automatic line protection testing system based on the real-time digital simulation system as claimed in claim 2, wherein the fixed format fault waveform file is a COMTRADE format file, the COMTRADE format file includes two subfiles of ". cfg" and ". dat", the ". cfg" subfile stores therein waveform names, generation times and data formats, and the ". dat" subfile stores therein curve data of the fault waveform file.
8. The system according to claim 7, wherein the waveform names of the single fault tests include a test serial number, a fault duration, a fault location, and a fault phase, and the waveform names of the transfer fault tests include a test serial number, a fault duration, a first fault location, a first fault phase, an interval time, a second fault location, and a second fault phase.
9. The automatic line protection test system based on the real-time digital simulation system as claimed in claim 1, wherein the test result is a ". word" file generated by MATLAB, if the test result is correct action, the ". word" file outputs a conclusion of "pass", and if the test result is rejection, malfunction or protection time is not within a set pass range, the ". word" file marks "error" and outputs a corresponding error item prompt.
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