CN108988355B - Method and system for quickly checking power oscillation caused by excitation system abnormality - Google Patents
Method and system for quickly checking power oscillation caused by excitation system abnormality Download PDFInfo
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- 230000010355 oscillation Effects 0.000 title claims abstract description 104
- 230000005856 abnormality Effects 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003381 stabilizer Substances 0.000 claims abstract description 23
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 238000013024 troubleshooting Methods 0.000 claims abstract description 4
- 230000002159 abnormal effect Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 4
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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Abstract
The invention discloses a method and a system for rapidly checking power oscillation caused by excitation system abnormality, wherein the method comprises the steps of collecting data parameters during the power oscillation period of a generator excitation system, and directly carrying out multi-round diagnosis and analysis in sequence according to the data parameters during the power oscillation period so as to judge whether the power oscillation is caused by the generator excitation system abnormality and whether the power oscillation is caused by the switching on/off abnormality of a power system stabilizer PSS, the output abnormality of the power system stabilizer PSS, the abnormality of an AVC instruction value, the abnormality of an AVR set value and the abnormality of a sampling channel; the system includes a computer system programmed to perform the above-described fast troubleshooting method. The invention does not need to carry out laboratory simulation and field test, can rapidly check whether the power oscillation is caused by the abnormality of the excitation system and all components thereof, and has the advantages of simplifying the analysis of the power oscillation event, shortening the shutdown time of the generator set, improving the efficiency, reducing the cost and having wide application range.
Description
Technical Field
The invention relates to a fault detection technology of a generator excitation system, in particular to a method and a system for quickly checking power oscillation caused by excitation system abnormality, which can be used for quickly checking whether the power oscillation is caused by the generator excitation system abnormality without modeling simulation or field test.
Background
The power oscillation of the power system is an abnormal event which has great harm to the operation of a power grid and a generator set and seriously influences the safe and stable operation of the power system. The investigation and analysis of the power oscillation reason is the basis for providing a targeted reverse power oscillation correction measure, so that the necessary means for effectively avoiding similar power oscillation events and improving the safety and stability performance of the power system is provided.
The excitation system is an important voltage and reactive power control device as an important device of the generator, and although active power is not directly controlled, active fluctuation may be caused by rapid voltage change. And the excitation system is provided with a Power System Stabilizer (PSS), and the power oscillation is easily caused by the abnormal operation of the excitation system. Therefore, it is necessary to investigate whether the excitation system abnormality causes the power oscillation.
The existing method for troubleshooting the power oscillation caused by the abnormal excitation system generally needs to take laboratory simulation or field test data as a basis, and aiming at most of the existing power oscillation events, because the outage time of the generator is hoped to be shortened as much as possible, a preliminary troubleshooting result needs to be given in a short time, and the laboratory simulation or the field test cannot be carried out.
Therefore, a fast checking method for power oscillation caused by excitation system abnormality is needed, which can quickly check whether the power oscillation is caused by the generator excitation system abnormality only by monitoring data during the power oscillation without developing laboratory simulation and field test. The existing methods related to power oscillation reason investigation and analysis are few: for example, chinese patent application No. 201710618287.8 discloses a test method for checking and optimizing forced power oscillation of a generator set, which checks whether the power oscillation is caused by a speed control system of the generator set by a modeling simulation test; for example, chinese patent application No. 201611244375.8 discloses a method and an apparatus for checking power oscillation caused by abnormality of a power system stabilizer, which implement checking whether power oscillation is caused by the power system stabilizer through a hybrid simulation test. The methods need to carry out related laboratory simulation or field test, and test data is taken as a basis to investigate whether the power oscillation is caused by equipment abnormality, so that the investigation result of whether the power oscillation is caused by a generator excitation system cannot be given in a short time.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a method and a system for rapidly checking power oscillation caused by excitation system abnormality, which can rapidly check whether the power oscillation is caused by the excitation system and the abnormality of each component part without carrying out laboratory simulation and field test, and have the advantages of simplifying power oscillation event analysis, shortening the shutdown time of a generator set, improving efficiency, reducing cost and having wide application range.
In order to solve the technical problems, the invention adopts the technical scheme that:
a fast checking method for power oscillation caused by excitation system abnormity comprises the following implementation steps:
1) collecting data parameters during power oscillation of a generator excitation system, wherein the data parameters comprise reactive power fluctuation time, excitation voltage fluctuation time, active power fluctuation time, generator active output, an automatic input threshold value and an automatic exit threshold value of a power system stabilizer PSS, an input/exit signal of the power system stabilizer PSS, power oscillation dominant frequency, local oscillation frequency of the generator excitation system, an excitation system low excitation limiting signal, an excitation system over excitation limiting signal, an excitation system V/Hz limiting signal, whether an automatic voltage control instruction is received or not, variation of the automatic voltage control instruction, reactive power, excitation voltage, a given value of an excitation system regulator AVR, excitation system excitation current, generator terminal voltage, generator terminal power and frequency;
2) judging whether the time of the fluctuation of the reactive power and the time of the fluctuation of the excitation voltage lag behind the time of the fluctuation of the active power and exceed a preset time threshold value, if so, skipping to execute the step 8), otherwise, skipping to execute the next step;
3) judging whether the active power output of the generator during the power oscillation period is between an automatic input threshold value and an automatic exit threshold value of a power system stabilizer PSS, and whether two conditions of more than 2 times of input/exit signals of the power system stabilizer PSS are simultaneously satisfied, if so, judging that the power oscillation is caused by input/exit abnormity of the power system stabilizer PSS, and skipping to execute the step 9); otherwise, skipping to execute the next step;
4) calculating the difference between the dominant frequency of the power oscillation during the power oscillation and the local oscillation frequency of the generator excitation system, judging whether the difference is within a preset frequency threshold value or whether two conditions of low excitation limit, over excitation limit or V/Hz limit signal occurrence for more than 2 times are met, if any condition is met, judging that the power oscillation is caused by output abnormality of a power system stabilizer PSS, and skipping to execute the step 9); otherwise, skipping to execute the next step;
5) judging whether two conditions that the generator excitation system receives the automatic voltage control instruction during the power oscillation period and the variation of the automatic voltage control instruction exceeds a preset variation threshold are simultaneously satisfied, if so, judging that the power oscillation is caused by the abnormal value of the automatic voltage control instruction, and skipping to execute the step 9); otherwise, skipping to execute the next step;
6) judging whether three conditions of a step of reactive power, a step of excitation voltage and a given value of an excitation system regulator AVR exceeding a preset proportional threshold are simultaneously satisfied during power oscillation, if so, judging that the power oscillation is caused by abnormal given value of the excitation system regulator AVR, and skipping to execute the step 9); otherwise, skipping to execute the next step;
7) judging whether sampling channels of excitation system exciting current, generator end voltage, generator end power and frequency are abnormal or not during power oscillation, if any one of the sampling channels is abnormal, judging that the power oscillation is caused by the abnormality of the sampling channel, and skipping to execute the step 9); otherwise, skipping to execute the next step;
8) determining that the power oscillation is not caused by the generator excitation system abnormality;
9) and (5) finishing detection and exiting.
Preferably, the preset time threshold in step 2) is 100 ms.
Preferably, the preset frequency threshold in step 4) is 0.1 Hz.
Preferably, the preset variation threshold in step 5) is 1%.
Preferably, the preset proportion threshold in step 6) is 1%.
In addition, the invention also provides a system for rapidly detecting the power oscillation caused by the abnormity of the generator excitation system, which comprises a computer system, wherein the computer system is programmed to execute the steps of the method for rapidly checking the power oscillation caused by the abnormity of the excitation system.
Compared with the prior art, the invention has the following advantages: the invention only depends on the data collected during the power oscillation, and qualitatively and rapidly checks whether the power oscillation is caused by the abnormality of the excitation system and each component part thereof according to different characteristics presented by the abnormality of the excitation system and each component part thereof which can cause the power oscillation. The invention does not need to carry out laboratory simulation and field test, can rapidly check whether the power oscillation is caused by the abnormality of the excitation system and all components thereof, and has the advantages of simplifying the analysis of the power oscillation event, shortening the shutdown time of the generator set, improving the efficiency, reducing the cost and having wide application range.
Drawings
FIG. 1 is a basic flow diagram of a method according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the implementation steps of the fast checking method for power oscillation caused by excitation system abnormality in this embodiment include:
1) collecting data parameters during power oscillation of a generator excitation system, wherein the data parameters comprise reactive power fluctuation time, excitation voltage fluctuation time, active power fluctuation time, generator active output, an automatic input threshold value and an automatic exit threshold value of a power system stabilizer PSS, an input/exit signal of the power system stabilizer PSS, power oscillation dominant frequency, local oscillation frequency of the generator excitation system, an excitation system low excitation limiting signal, an excitation system over excitation limiting signal, an excitation system V/Hz limiting signal, whether an automatic voltage control instruction is received or not, variation of the automatic voltage control instruction, reactive power, excitation voltage, a given value of an excitation system regulator AVR, excitation system excitation current, generator terminal voltage, generator terminal power and frequency; the data parameters during the power oscillation period are respectively from data information acquired in a power grid synchronous Phasor Measurement Unit (PMU), a fault recording and monitoring system and a generator excitation system and relevant parameters of each module of the excitation system;
2) judging whether the time of the fluctuation of the reactive power and the time of the fluctuation of the excitation voltage lag behind the time of the fluctuation of the active power and exceed a preset time threshold value, if so, skipping to execute the step 8), otherwise, skipping to execute the next step; in this embodiment, the preset time threshold in step 2) is 100 ms.
3) Judging whether the active power output of the generator during the power oscillation period is between an automatic input threshold value and an automatic exit threshold value of a power system stabilizer PSS, and whether two conditions of more than 2 times of input/exit signals of the power system stabilizer PSS are simultaneously satisfied, if so, judging that the power oscillation is caused by input/exit abnormity of the power system stabilizer PSS, and skipping to execute the step 9); otherwise, skipping to execute the next step;
4) calculating the difference between the dominant frequency of the power oscillation during the power oscillation and the local oscillation frequency of the generator excitation system, judging whether the difference is within a preset frequency threshold value or whether two conditions of low excitation limit, over excitation limit or V/Hz limit signal occurrence for more than 2 times are met, if any condition is met, judging that the power oscillation is caused by output abnormality of a power system stabilizer PSS, and skipping to execute the step 9); otherwise, skipping to execute the next step; in this embodiment, the preset frequency threshold in step 4) is 0.1 Hz.
5) Judging whether two conditions that the generator excitation system receives the automatic voltage control instruction during the power oscillation period and the variation of the automatic voltage control instruction exceeds a preset variation threshold are simultaneously satisfied, if so, judging that the power oscillation is caused by the abnormal value of the automatic voltage control instruction, and skipping to execute the step 9); otherwise, skipping to execute the next step; in this embodiment, the preset variation threshold in step 5) is 1%.
6) Judging whether three conditions of a step of reactive power, a step of excitation voltage and a given value of an excitation system regulator AVR exceeding a preset proportional threshold are simultaneously satisfied during power oscillation, if so, judging that the power oscillation is caused by abnormal given value of the excitation system regulator AVR, and skipping to execute the step 9); otherwise, skipping to execute the next step; in this embodiment, the preset proportion threshold in step 6) is 1%.
7) Judging whether sampling channels of excitation system exciting current, generator end voltage, generator end power and frequency are abnormal or not during power oscillation, if any one of the sampling channels is abnormal, judging that the power oscillation is caused by the abnormality of the sampling channel, and skipping to execute the step 9); otherwise, skipping to execute the next step;
8) determining that the power oscillation is not caused by the generator excitation system abnormality;
9) and (5) finishing detection and exiting.
In summary, the method for rapidly checking power oscillation caused by excitation system abnormality in this embodiment can achieve rapid checking analysis of power oscillation caused by excitation system abnormality of a generator, does not need to develop laboratory simulation and field test, and only depends on data collected during power oscillation, and qualitatively and rapidly checks whether power oscillation is caused by excitation system abnormality of the generator and abnormality of each component according to different characteristics presented by the excitation system and abnormality of each component, thereby having the advantages of simplifying power oscillation event analysis, shortening shutdown time of a generator set, improving efficiency, reducing cost, and having a wide application range.
In addition, the present embodiment further provides a system for rapidly detecting power oscillation caused by excitation system abnormality of a generator, which includes a computer system programmed to execute the steps of the method for rapidly checking power oscillation caused by excitation system abnormality of the present embodiment.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. A fast checking method for power oscillation caused by excitation system abnormity is characterized by comprising the following implementation steps:
1) collecting data parameters during power oscillation of a generator excitation system, wherein the data parameters comprise reactive power fluctuation time, excitation voltage fluctuation time, active power fluctuation time, generator active output, an automatic input threshold value and an automatic exit threshold value of a power system stabilizer PSS, an input/exit signal of the power system stabilizer PSS, power oscillation dominant frequency, local oscillation frequency of the generator excitation system, an excitation system low excitation limiting signal, an excitation system over excitation limiting signal, an excitation system V/Hz limiting signal, whether an automatic voltage control instruction is received or not, variation of the automatic voltage control instruction, reactive power, excitation voltage, a given value of an excitation system regulator AVR, excitation system excitation current, generator terminal voltage, generator terminal power and frequency;
2) judging whether the time of the fluctuation of the reactive power and the time of the fluctuation of the excitation voltage lag behind the time of the fluctuation of the active power and exceed a preset time threshold value, if so, skipping to execute the step 8), otherwise, skipping to execute the next step;
3) judging whether the active power output of the generator during the power oscillation period is between an automatic input threshold value and an automatic exit threshold value of a power system stabilizer PSS, and whether two conditions of more than 2 times of input/exit signals of the power system stabilizer PSS are simultaneously satisfied, if so, judging that the power oscillation is caused by input/exit abnormity of the power system stabilizer PSS, and skipping to execute the step 9); otherwise, skipping to execute the next step;
4) calculating the difference between the dominant frequency of the power oscillation during the power oscillation and the local oscillation frequency of the generator excitation system, judging whether the difference is within a preset frequency threshold value or whether two conditions of low excitation limit, over excitation limit or V/Hz limit signal occurrence for more than 2 times are met, if any condition is met, judging that the power oscillation is caused by output abnormality of a power system stabilizer PSS, and skipping to execute the step 9); otherwise, skipping to execute the next step;
5) judging whether two conditions that the generator excitation system receives the automatic voltage control instruction during the power oscillation period and the variation of the automatic voltage control instruction exceeds a preset variation threshold are simultaneously satisfied, if so, judging that the power oscillation is caused by the abnormal value of the automatic voltage control instruction, and skipping to execute the step 9); otherwise, skipping to execute the next step;
6) judging whether three conditions of a step of reactive power, a step of excitation voltage and a given value of an excitation system regulator AVR exceeding a preset proportional threshold are simultaneously satisfied during power oscillation, if so, judging that the power oscillation is caused by abnormal given value of the excitation system regulator AVR, and skipping to execute the step 9); otherwise, skipping to execute the next step;
7) judging whether sampling channels of excitation system exciting current, generator end voltage, generator end power and frequency are abnormal or not during power oscillation, if any one of the sampling channels is abnormal, judging that the power oscillation is caused by the abnormality of the sampling channel, and skipping to execute the step 9); otherwise, skipping to execute the next step;
8) determining that the power oscillation is not caused by the generator excitation system abnormality;
9) and (5) finishing detection and exiting.
2. The method for rapidly checking power oscillation caused by excitation system abnormality according to claim 1, wherein the preset time threshold in step 2) is 100 ms.
3. The method for rapidly checking power oscillation caused by excitation system abnormality according to claim 1, wherein the preset frequency threshold in step 4) is 0.1 Hz.
4. The method for rapidly checking power oscillation caused by excitation system abnormality according to claim 1, wherein the preset variation threshold in step 5) is 1%.
5. The method for rapidly checking power oscillation caused by excitation system abnormality according to claim 1, wherein the preset proportion threshold in step 6) is 1%.
6. A rapid troubleshooting system for power oscillation caused by excitation system abnormity comprises a computer system and is characterized in that: the computer system is programmed to execute the steps of the method for rapidly checking the power oscillation caused by the excitation system abnormality according to any one of claims 1 to 5.
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