CN108459219B - Method and system for testing excitation system - Google Patents
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Abstract
A method and system for testing an excitation system, comprising: inputting the acquired fault data into an excitation system to be tested to obtain an actually measured oscillogram; and comparing the actually measured oscillogram with a theoretical oscillogram corresponding to the fault data to verify whether the excitation system works normally. The invention verifies whether the excitation system can work normally or not efficiently under the condition that the excitation system is not disassembled and assembled, and makes up the defect that the method for detecting the excitation system is not available at present.
Description
Technical Field
The invention relates to the field of power plant electricity, in particular to a method and a system for testing an excitation system.
Background
The excitation system is a power supply for supplying excitation current to the synchronous generator and its accessories. It is generally composed of two main parts, namely an excitation power unit and an excitation regulator. The excitation power unit provides excitation current for the rotor of the synchronous generator; the excitation regulator controls the output of the excitation power unit as a function of the input signal and a given regulation criterion. The automatic excitation regulator of the excitation system has a great effect on improving the stability of the parallel units of the power system, and particularly, the development of the modern power system leads to the trend of reducing the stability limit of the units, so that the excitation system is indispensable, and the stability of the power system, including static stability, transient stability and dynamic stability, is improved. Therefore, whether the excitation system works normally under various power system disturbances and faults is directly related to unit safety and power system safety, but a method for testing the excitation system is still lacked at present.
Disclosure of Invention
To address the above-discussed deficiencies of the prior art, the present invention provides a method and system for testing an excitation system.
The technical scheme provided by the invention is as follows: a method for testing an excitation system, comprising:
inputting the acquired fault data into an excitation system to be tested to obtain an actually measured oscillogram;
and comparing the actually measured oscillogram with a theoretical oscillogram corresponding to the fault data to verify whether the excitation system works normally.
Preferably, the comparing the measured waveform diagram with the theoretical waveform diagram corresponding to the fault data to verify whether the excitation system is working normally includes:
and when the difference between the actually measured oscillogram and the theoretical oscillogram corresponding to the fault data is within a preset threshold range, the excitation system normally works, otherwise, the excitation system abnormally works.
Preferably, the theoretical waveform diagram corresponding to the fault data includes:
and inputting the fault data into an excitation system model to obtain a theoretical waveform diagram which is a theoretical waveform diagram corresponding to the fault data.
Preferably, the obtaining of the fault data includes:
and collecting fault data of the power grid or simulating the fault through simulation software to obtain the fault data.
Preferably, the collecting fault data of the power grid includes:
and respectively acquiring fault data of three-phase faults, two-phase faults, single-phase faults, system low-frequency oscillation and system high-frequency oscillation of the power grid.
Preferably, the simulating the fault by the simulation software to obtain the fault data includes:
establishing a corresponding simulation model in electromagnetic transient simulation calculation software;
and respectively simulating single-phase faults, two-phase faults, three-phase faults, system low-frequency oscillation and system high-frequency oscillation in different time lengths in corresponding simulation models, and acquiring fault data.
Preferably, the inputting the acquired fault data into the excitation system to be tested to obtain an actually measured oscillogram includes:
the acquired fault data is input into an excitation system to be tested after being subjected to waveform playback and passing through a power amplifier;
and recording an actually measured oscillogram output by the excitation system to be tested.
Based on the same inventive concept, the invention also provides a system for testing an excitation system, comprising:
the input module is used for inputting the acquired fault data into an excitation system to be tested to obtain an actually measured oscillogram;
and the processing module is used for comparing the actually measured oscillogram with a theoretical oscillogram corresponding to the fault data to verify whether the excitation system works normally.
Preferably, the processing module includes:
the judging unit is used for judging whether the difference between the actual measurement oscillogram and the theoretical oscillogram corresponding to the fault data is within a preset threshold range or not, if so, judging that the excitation system normally works, otherwise, judging that the excitation system abnormally works;
and the processing unit is used for inputting the fault data into an excitation system model to obtain a theoretical waveform diagram which is a theoretical waveform diagram corresponding to the fault data.
Preferably, the input module includes:
the input unit is used for inputting the acquired fault data into an excitation system to be tested after the fault data passes through a power amplifier after being subjected to waveform playback;
and the recording unit is used for recording the actually measured oscillogram output by the excitation system to be measured.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
according to the technical scheme provided by the invention, the acquired fault data is input into an excitation system to be tested to obtain an actually measured oscillogram; and further comparing the actually measured oscillogram with a theoretical oscillogram corresponding to the fault data to verify whether the excitation system works normally, efficiently verifying whether the excitation system can work normally under the condition that the excitation system is not disassembled and assembled, and making up for the defect that the excitation system detection method is not available at present.
Drawings
FIG. 1 is a flow chart of a method for testing a power stabilizer according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a method for testing a power stabilizer according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a power stabilizer according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an abnormal operation of the power stabilizer according to the embodiment of the present invention;
FIG. 5 is a flow chart of a testing method of the speed control system in the embodiment of the invention;
FIG. 6 is a schematic diagram of a test platform of the speed control system in an embodiment of the invention;
FIG. 7 is a waveform diagram illustrating the normal operation of the governor system in an embodiment of the present invention;
FIG. 8 is a waveform diagram illustrating an abnormal operation of the governor system in an embodiment of the present invention;
FIG. 9 is a flow chart of a method for testing an excitation system in an embodiment of the present invention;
FIG. 10 is a schematic diagram of a test platform for an excitation system in an embodiment of the invention;
FIG. 11 is a waveform diagram illustrating normal operation of an excitation system in an embodiment of the present invention;
fig. 12 is a waveform diagram showing an abnormal operation of the excitation system in the embodiment of the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
Example 1
In this embodiment, a method for testing an electric power system is provided, including:
inputting the obtained playback data into a power system to be tested to obtain an actually measured oscillogram;
inputting the playback data into a preset power system model to obtain a theoretical oscillogram;
and when the difference between the actual measurement oscillogram and the theoretical oscillogram is within a preset threshold range, the power system normally works, otherwise, the power system abnormally works.
The inputting of the obtained playback data into the power system to be tested to obtain the actually measured oscillogram includes:
inputting the playback data into a power system to be tested after passing through a power amplifier;
and recording an actually measured oscillogram output by the power system to be measured.
The acquired playback data includes:
collecting fault data of the power grid, and obtaining first playback data through waveform playback or simulating the fault data through simulation software and obtaining second playback data through waveform playback.
The collecting of the fault data of the power grid obtains first playback data through waveform playback, and the method comprises the following steps:
respectively acquiring three-phase fault data, two-phase fault data, single-phase fault data, low-frequency oscillation data and high-frequency oscillation fault data of a power grid;
and carrying out waveform playback on the fault data to obtain first playback data.
The simulating fault data by simulation software and the second playback data obtained by waveform playback comprise:
establishing a corresponding simulation model in electromagnetic transient simulation calculation software;
respectively simulating single-phase faults, two-phase faults, three-phase faults, low-frequency oscillation and high-frequency oscillation in different time lengths in corresponding simulation models;
and acquiring fault characteristics and obtaining second playback data through waveform playback.
The power system includes: the device comprises a power stabilizer, a speed regulating system and an excitation system.
Example 2
Taking the power stabilizer as an example, the present embodiment provides a method for testing the power stabilizer, as shown in fig. 1, including:
step S101: inputting the obtained playback data into a power stabilizer to be tested to obtain an actually measured oscillogram;
step S102: inputting the playback data into a preset power stabilizer model to obtain a theoretical oscillogram;
step S103: and when the difference between the actual measurement oscillogram and the theoretical oscillogram is within a preset threshold range, the electric power stabilizer normally works, otherwise, the electric power stabilizer abnormally works.
It should be noted that, in this embodiment, the step S101 and the step S102 are not in sequence.
The embodiment provides a method for testing a power stabilizer, which comprises the following specific steps:
firstly, inputting acquired playback data into a power stabilizer to be measured to obtain an actually measured oscillogram;
collecting fault data of a power grid, obtaining first playback data through waveform playback, simulating the fault data through simulation software, and obtaining second playback data through waveform playback.
Wherein the playback data includes: first playback data and second playback data.
Collecting single-phase fault data, two-phase fault data and three-phase fault data which are generated by an actual power grid, wherein the low-frequency oscillation fault data (0.1-2.0Hz) of the system and the high-frequency oscillation fault data (5-30Hz) of the system are collected, the fault data comprise three-phase voltage and three-phase current data of the same measuring point and serve as first return data, and the sampling rate of the actually measured data is not less than 5 kHz;
in electromagnetic transient simulation calculation software, such as PSCAD, EMTDC and other software, single-phase faults, two-phase faults and three-phase faults (50ms, 90ms, 120ms and the like) with different time lengths are simulated, low-frequency oscillation (0.1-2Hz) of the system is performed, high-frequency oscillation (5-30Hz) of the system is performed to obtain three-phase voltage and three-phase current obtained by simulation, the three-phase voltage and the three-phase current are used as second playback data, and the sampling rate of the simulation data is not less than 10 kHz;
the method comprises the steps that a power stabilizer PSS to be tested is connected into a power amplifier, and the voltage and current transformation ratio of the power amplifier is set according to PSS input parameters; according to specific requirements, first playback data, namely actual power grid fault data, can be selected, or second playback data, namely simulation fault data, is selected, and the data are output to be three-phase voltage and three-phase current signals through a power amplifier;
inputting the three-phase voltage and three-phase current signals into a to-be-detected power stabilizer to obtain an actually-measured oscillogram;
secondly, inputting the playback data into a preset power stabilizer model to obtain a theoretical oscillogram;
and finally, when the difference between the actual measurement oscillogram and the theoretical oscillogram is within the range of the preset threshold value, the electric power stabilizer normally works, otherwise, the electric power stabilizer abnormally works.
As shown in fig. 2, in this embodiment, a simulation platform is established by taking a 600MW unit as an example, and a PSS parameter is set, wherein a PT transformation ratio is 22000:220 to 100, and a CT transformation ratio is 20000:5 to 4000;
the method comprises the steps of obtaining a direct current signal from fault data of three-phase faults, two-phase faults, single-phase faults, low-frequency oscillation, high-frequency oscillation and the like through a waveform playback tool, outputting an alternating current signal from the direct current signal through a power amplifier, inputting the alternating current signal into a power stabilizer to be tested to test the dynamic characteristics of the power stabilizer, and recording an actually measured waveform diagram through a portable electric quantity (waveform) recording analyzer.
Sequentially inputting data input into the power stabilizer to be tested into a preset power stabilizer model, and recording a theoretical oscillogram by a portable electric quantity (waveform) recording analyzer;
and when the difference between the actual measurement oscillogram and the theoretical oscillogram is within the preset threshold range, the electric power stabilizer normally works, otherwise, the electric power stabilizer abnormally works.
The results of comparing the dynamic measurements are shown in fig. 3 and 4. In fig. 3, the difference between the actual measurement result and the theoretical result is within the preset threshold range, and the PSS works normally, while in fig. 4, the difference between the actual measurement result and the theoretical result is not within the preset threshold range, so that the PSS works abnormally.
Example 3
Taking a speed regulation system as an example, the embodiment provides a test method of the speed regulation system;
fig. 5 is a flowchart of a testing method of the governor system, and as shown in fig. 5, the method includes:
step S501, obtaining playback data;
step S502, inputting the playback data into a speed regulating system to be tested and a speed regulating system model which is constructed in advance respectively to obtain a oscillogram;
and S503, testing whether the speed regulating system can work normally or not by utilizing a oscillogram obtained by the speed regulating system to be tested and the speed regulating system model.
In the implementation, a simulation platform is established by a 600MW unit, parameters of a speed regulating system are set, the signal range of a power measuring channel is 0-1000MW, and the frequency measuring range is 0-100 Hz;
as shown in fig. 6, firstly, the collected fault data is passed through a playback tool to obtain playback data;
then, inputting the playback data into a speed regulating system to be tested through a power amplifier, and recording an actually measured oscillogram through a waveform recorder;
meanwhile, the playback data is input into a speed regulating system model established according to theory, and a theoretical oscillogram is recorded through a oscillograph;
as shown in fig. 7, when the difference between the actual measurement waveform diagram and the theoretical waveform diagram is within the preset threshold range, the speed regulating system normally works, otherwise, as shown in fig. 8, the speed regulating system works abnormally.
The fault data in this implementation includes: collecting typical single-phase fault data, two-phase fault data and three-phase fault data of an actual power grid, wherein the low-frequency oscillation data (0.1-2.0Hz) of the system comprise power and frequency data of the same measuring point, and the sampling rate of the actually measured data is not less than 1 kHz;
or in PSCAD and EMTDC electromagnetic transient simulation calculation software, simulating single-phase faults, two-phase faults and three-phase faults (50ms, 90ms, 120ms and the like) with different time lengths, and carrying out low-frequency oscillation (0.1-2Hz) on the system to obtain power and frequency data obtained by simulation, wherein the sampling rate of the simulation data is not less than 1 kHz;
and obtaining the playback data through the playback tool according to the obtained fault data.
Inputting the playback data into a speed regulating system to be tested through a power amplifier to obtain an actually measured oscillogram;
meanwhile, fault data corresponding to the playback data are input into a speed regulation system model to obtain a theoretical oscillogram;
and when the difference between the actual measurement oscillogram and the theoretical oscillogram is within the preset threshold range, the speed regulating system normally works, otherwise, the speed regulating system abnormally works.
Example 4
Fig. 9 is a flowchart of a method for testing an excitation system, and as shown in fig. 9, the method specifically includes:
step S901, inputting the acquired fault data into an excitation system to be tested to obtain an actually measured oscillogram;
and step S902, comparing the actually measured oscillogram with a theoretical oscillogram corresponding to the fault data to verify whether the excitation system works normally.
The method comprises the following specific steps:
for step S901, inputting the acquired fault data into the excitation system to be tested to obtain an actual measurement oscillogram, including:
acquiring the acquired fault data through a playback tool to obtain a direct current signal;
inputting the direct current signals into a power amplifier to obtain alternating current signals of three-phase voltage and three-phase current;
and inputting the alternating current signal into an excitation system to be tested to measure the characteristic test, and obtaining an actually measured oscillogram.
Aiming at the step S902, comparing the measured waveform diagram with the theoretical waveform diagram corresponding to the fault data to verify whether the excitation system works normally includes:
inputting fault data into a pre-established excitation system model to obtain a theoretical oscillogram;
and comparing the theoretical waveform diagram with the actual measurement waveform diagram obtained in the step S901, if the difference is within a preset threshold range, the excitation system normally works, otherwise, the excitation system works abnormally.
In this embodiment, a 600MW unit is taken as an example to establish a simulation platform, set parameters of an excitation system, and perform working conditions of the excitation system under faults such as three-phase, two-phase, single-phase typical faults, system low-frequency oscillation, system high-frequency oscillation and the like, as shown in fig. 10, collected fault data is processed and then input into the excitation system to be detected through a power amplifier, and meanwhile, the fault data is input into an excitation system model;
recording an actually measured waveform output by an excitation system to be tested and a theoretical waveform output by an excitation system model through a portable electric quantity (waveform) recording analyzer, and comparing the waveforms recorded by the portable electric quantity (waveform) recording analyzer;
as shown in fig. 11, when the difference between the actual measurement waveform diagram and the theoretical waveform diagram is within the preset threshold range, the excitation system normally operates, otherwise, as shown in fig. 12, the excitation system abnormally operates.
In this embodiment, two failure data obtaining manners are provided, which are respectively:
collecting typical single-phase fault data, two-phase fault data and three-phase fault data of an actual power grid, low-frequency oscillation data (0.1-2.0Hz) of a system and high-frequency oscillation data (5-30Hz) of the system, wherein the data comprise three-phase voltage data and three-phase current data of the same measuring point, and the sampling rate of the actually measured data is not less than 5 kHz;
in electromagnetic transient simulation calculation software such as PSCAD (power system computer aided design) and EMTDC (electromagnetic transient simulation), single-phase faults, two-phase faults and three-phase faults (50ms, 90ms, 120ms and the like) with different time lengths are simulated respectively, the low-frequency oscillation (0.1-2Hz) of the system and the high-frequency oscillation (5-30Hz) of the system are used for acquiring three-phase voltage and three-phase current obtained by simulation, and the sampling rate of simulation data is not less than 10 kHz.
Based on the same inventive concept, the present embodiment further provides a system for testing an excitation system, including:
the input module is used for inputting the acquired fault data into an excitation system to be tested to obtain an actually measured oscillogram;
and the processing module is used for comparing the actually measured oscillogram with a theoretical oscillogram corresponding to the fault data to verify whether the excitation system works normally.
In an embodiment, the processing module includes:
the judging unit is used for judging whether the difference between the actual measurement oscillogram and the theoretical oscillogram corresponding to the fault data is within a preset threshold range or not, if so, judging that the excitation system normally works, otherwise, judging that the excitation system abnormally works;
and the processing unit is used for inputting the fault data into an excitation system model to obtain a theoretical waveform diagram which is a theoretical waveform diagram corresponding to the fault data.
In an embodiment, the input module includes:
the input unit is used for inputting the acquired fault data into an excitation system to be tested after the fault data passes through a power amplifier after being subjected to waveform playback;
and the recording unit is used for recording the actually measured oscillogram output by the excitation system to be tested.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (2)
1. A method for testing an excitation system, comprising:
inputting the acquired fault data into an excitation system to be tested to obtain an actual measurement oscillogram;
comparing the actually measured oscillogram with a theoretical oscillogram corresponding to the fault data to verify whether the excitation system works normally or not;
the comparing the actually measured oscillogram with the theoretical oscillogram corresponding to the fault data to verify whether the excitation system works normally comprises the following steps:
when the difference between the actually measured oscillogram and the theoretical oscillogram corresponding to the fault data is within a preset threshold range, the excitation system works normally, otherwise, the excitation system works abnormally;
the theoretical oscillogram corresponding to the fault data comprises the following steps:
a theoretical waveform diagram obtained by inputting the fault data into an excitation system model is a theoretical waveform diagram corresponding to the fault data;
the obtaining of the fault data comprises:
collecting fault data of a power grid or simulating a fault through simulation software to obtain the fault data;
the collecting fault data of the power grid comprises the following steps:
respectively acquiring fault data of three-phase fault, two-phase fault, single-phase fault, system low-frequency oscillation and system high-frequency oscillation of a power grid;
the fault data obtained by simulating the fault through the simulation software comprises the following steps:
establishing a corresponding simulation model in electromagnetic transient simulation calculation software;
respectively simulating single-phase faults, two-phase faults, three-phase faults, system low-frequency oscillation and system high-frequency oscillation with different time lengths in corresponding simulation models, and acquiring fault data;
the inputting of the acquired fault data into the excitation system to be tested to obtain the actually measured oscillogram includes:
the acquired fault data is input into an excitation system to be tested after being subjected to waveform playback and passing through a power amplifier;
and recording an actually measured oscillogram output by the excitation system to be tested.
2. A test exciter system for use in the method of claim 1, comprising:
the input module is used for inputting the acquired fault data into an excitation system to be tested to obtain an actually measured oscillogram;
the processing module is used for comparing the actually measured oscillogram with a theoretical oscillogram corresponding to the fault data to verify whether the excitation system works normally or not;
the processing module comprises:
the judging unit is used for judging whether the difference between the actual measurement oscillogram and the theoretical oscillogram corresponding to the fault data is within a preset threshold range or not, if so, judging that the excitation system normally works, otherwise, judging that the excitation system abnormally works;
the processing unit is used for inputting the fault data into an excitation system model to obtain a theoretical waveform diagram which is a theoretical waveform diagram corresponding to the fault data;
the input module includes:
the input unit is used for inputting the acquired fault data into an excitation system to be tested after the fault data passes through a power amplifier after being subjected to waveform playback;
and the recording unit is used for recording the actually measured oscillogram output by the excitation system to be measured.
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| CN108459219A (en) | 2018-08-28 |
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