CN103823183A - Method for measuring stator open circuit transient time-constant of synchronous generator - Google Patents
Method for measuring stator open circuit transient time-constant of synchronous generator Download PDFInfo
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Abstract
In order to solve the problems in the modeling process of an existing excitation system that a measurement safety requirement is high and test work load is large due to the fact that a traditional method for measuring a transient time-constant of a generator stator open circuit generally requires changing a circuit wiring for one time, a method for measuring the stator open circuit transient time-constant of a synchronous generator is provided. According to the method, a generator no-load simulation system is established based on a matlab/simulink platform, practically measured exciting voltage of a synchronous generator serves as input, a generator output voltage curve is simulated and obtained, a practically measured curve and the simulation curve of the output voltage of the generator are compared, and the transient time-constant of the synchronous generator stator open circuit is obtained through fitting. The measurement method combining a test and simulation fitting, the problems of complex wiring and low result accuracy of the traditional test method are effectively solved, and high economy and practical value are achieved.
Description
Technical field
The present invention relates to Operation of Electric Systems and measure correlative technology field, say further, relate to a kind of measuring method of synchronous generator stator open circuit transient time-constant, especially adopt the measuring method of the synchronous generator stator open circuit transient time-constant of self-shunt excitation system, to solve the measurement problem of generator unit stator open circuit transient time-constant in Modeling of excitation system process.
Background technology
Along with economic development, Power System Interconnection scale constantly increases, and power construction speed is also synchronously accelerated.Safety and stability performance when heavy-duty generator group is incorporated into the power networks is related to the safety and stability of whole operation of power networks, and the excitation system of these units plays vital effect to the stable operation of unit.Therefore, when the large new unit of capacity puts into operation, can the adjusting function of excitation system meet the requirement of set grid-connection safe and stable operation, becomes the focus that electric system is paid close attention to.
Modeling of excitation system is to provide on the basis of technical support and on-the-spot supervisory service for generator excitation system commissioning tests, foundation can truly reflect the excitation system model of unit control characteristic, and in conjunction with every commissioning tests waveform, whether the adjusting function of analyzing excitation system meets grid-connected requirement.Wherein, in Modeling of excitation system process, generator unit stator open circuit transient time-constant is very large on simulation result impact, and traditional measuring method is because needs are changed primary circuit wiring, and its security requirement is high, experiment work amount is large.
Summary of the invention
The present invention is in order to solve in existing Modeling of excitation system process, the method of traditional measurement generator unit stator open circuit transient time-constant generally need to be changed primary circuit wiring, make to measure the problem that security requirement is higher, experiment work amount is larger, a kind of measuring method of synchronous generator stator open circuit transient time-constant is provided.
Technical scheme of the present invention is as follows:
A measuring method for synchronous generator stator open circuit transient time-constant, is characterized in that, comprises the steps:
1, allow tested synchronous generator operate under idle condition, the output voltage of adjusting synchronous generator is less than the rated output voltage of synchronous generator, and makes field regulator operate in automatic channel;
2, tested synchronous generator is carried out to voltage step test, record in step process of the test, the output voltage curve of tested synchronous generator and field voltage curve;
3, the no-load simulation system that adopts matlab/simulink to build tested synchronous generator, in no-load simulation system, draft stator open circuit transient time-constant, input using the tested alternator field voltage curve of record in step 2 as no-load simulation system, the simulation curve of output synchronous generator output voltage;
4, in the time that the deviation of rise time, overshoot and the steady-state value of described simulation curve and the output voltage curve of tested synchronous generator all meets default deviation range, stator open circuit transient time-constant by the stator open circuit transient time-constant of drafting in step 3 as tested synchronous generator, otherwise the stator of drafting in set-up procedure 3 open circuit transient time-constant, until the rise time of simulation curve, overshoot and steady-state value all meet default deviation range, obtain the stator open circuit transient time-constant of tested synchronous generator.
In the present invention, in described step 1,50% to 70% of the rated output voltage that the output voltage of adjusting synchronous generator is synchronous generator.
In the present invention, the voltage step test in described step 2 is tested synchronous generator 3% to 5% voltage step test.
In the present invention, in described step 2, output voltage to tested synchronous generator and field voltage carry out standardization, obtain output voltage per-unit curve and the field voltage per-unit curve of the tested synchronous generator after mark one, described synchronous generator output voltage perunit value Ut=Ut_sc/Un, field voltage perunit value Uf=(Ut_w/Uf_w/Un) * Uf_sc, wherein, Ut_sc is the output voltage values of tested synchronous generator, Un is tested synchronous generator rated output voltage value, Uf_w is tested synchronizing generator voltage step test stable state field voltage value, the tested synchronous generator stable state of Ut_w output voltage values.
Adopt after tested synchronizing generator voltage step test stable state, on field voltage curve, the mean value of the field voltage value of multiple moment point is as tested synchronizing generator voltage step test stable state field voltage value, before adopting the mean value of synchronous generator output voltage values of the each comfortable synchronization of field voltage value of multiple moment point as tested synchronous generator stable state output voltage values.
In described step 3, the input using field voltage per-unit curve as no-load simulation system, the simulation curve of no-load simulation system output synchronous generator output voltage per-unit curve.
In described step 4, when rise time, overshoot and the steady-state value of simulation curve of described output voltage per-unit curve and the deviation of the output voltage per-unit curve of tested synchronous generator are during all in default deviation range, the stator open circuit transient time-constant by the stator open circuit transient time-constant of drafting in step 3 as tested synchronous generator.
In the present invention, in the time that the overshoot of described simulation curve is bigger than normal, tune up the stator open circuit transient time-constant of drafting in step 3, otherwise turn the stator open circuit transient time-constant of drafting in step 3 down.
The adjusting step-length of the described stator open circuit transient time-constant of drafting is 0.01s to 0.05s.
In the present invention, the default deviation range of described rise time is ± 0.005s, and the default deviation range of described overshoot is ± 1%, and the default deviation range of described steady-state value is to be no more than step amount ± 1%.
The measuring method of synchronous generator stator open circuit transient time-constant of the present invention, the method of testing that test combines with emulation matching has been proposed, the present invention has does not need to change primary circuit wiring, the simple good characteristic of process of the test, the present invention is particularly useful for the measurement of the generator unit stator open circuit transient time constant of self-shunt excitation system, effectively solve the wiring complexity of traditional experiment method, the problem that result accuracy is not high, there is higher economy and practical value.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Fig. 2 is in voltage step test, synchronous generator output voltage per-unit curve and no-load simulation system emulation per-unit curve, the contrast schematic diagram of the first situation.
Fig. 3 is in voltage step test, synchronous generator output voltage per-unit curve and no-load simulation system emulation per-unit curve, the contrast schematic diagram of the second situation.
Fig. 4 is in voltage step test, synchronous generator output voltage per-unit curve and no-load simulation system emulation per-unit curve, the contrast schematic diagram of the third situation.
Embodiment
First, it should be noted that, for synchronous generator, especially adopt self-shunt excitation system, the field voltage of generator is field regulator output, is input to Generator's Rotor Circuit and carries out excitation, and the output voltage of generator is exported by stator.
Referring to Fig. 1, the measuring method of synchronous generator stator open circuit transient time-constant of the present invention, comprises the steps:
First, allow tested synchronous generator operate under idle condition, the output voltage of adjusting synchronous generator is less than the rated output voltage of synchronous generator, and makes field regulator operate in automatic channel.In order to obtain good measurement effect, the output voltage of synchronous generator is preferably as 50% to 70% of the rated output voltage of synchronous generator, this be because, when synchronizing generator voltage is lower than 70%, generator is in unsaturation state, and its model is first order inertial loop, and when being greater than 70%, generator operation is in saturation region, and its model need be considered saturation characteristic, model relative complex; Self-shunt excitation system brownout cannot be set up voltage, so the output voltage of synchronous generator can not be lower than 50% of rated output voltage, now excitation system is stable.
Then, tested synchronous generator is carried out to voltage step test, voltage step test is preferably and adopts tested synchronous generator 3% to 5% voltage step test, this be because, the excessive field regulator amplitude limit district that easily enters of step amount, the too small process of step amount is clear not remarkable again, in step process of the test, output voltage curve and the field voltage curve of tested synchronous generator carry out record, recording process can adopt electric weight recorder analyser to carry out, by the recorder data forming curves of electric weight recorder analyser.
Then, the no-load simulation system that adopts matlab/simulink to build tested synchronous generator, in no-load simulation system, draft stator open circuit transient time-constant, input using the tested alternator field voltage curve that records in previous step as no-load simulation system, here, electric weight recorder analyser is converted to excel file and imports in matlab the recorder data of field voltage, those skilled in the art know this, be not repeated herein, finally, the simulation curve of no-load simulation system output synchronous generator output voltage;
Finally, the simulation curve of no-load simulation system output synchronous generator output voltage and the output voltage curve of tested synchronous generator are contrasted, when the rise time of simulation curve, when the deviation of the output voltage curve of overshoot and steady-state value and tested synchronous generator all meets default deviation range, by drafting the stator open circuit transient time-constant of stator open circuit transient time-constant as tested synchronous generator in no-load simulation system, otherwise in adjustment no-load simulation system, draft stator open circuit transient time-constant, until the rise time of simulation curve, overshoot and steady-state value all meet default deviation range, obtain the stator open circuit transient time-constant of tested synchronous generator.Here, for the default deviation range of rise time, overshoot and steady-state value, the default deviation range that is preferably the rise time is ± 0.005s, compared with the output voltage curve of simulation curve and tested synchronous generator the deviation of rise time within ± 0.005s; The default deviation range of overshoot is ± 1%, compared with the output voltage curve of simulation curve and tested synchronous generator the deviation of overshoot be no more than ± 1%; The default deviation range of steady-state value is to be no more than step amount ± 1%, compared with the output voltage curve of simulation curve and tested synchronous generator the deviation of steady-state value be no more than ± 1%.
Referring to Fig. 2 to Fig. 4, the present invention is take certain synchronous generator as example, adopt the inventive method to measure generator unit stator open circuit transient time-constant, and in conjunction with the data that provide in synchronous generator instructions and on-site actual situations, verify the validity of the inventive method.Specific implementation process is as follows:
In the time of tested synchronous generator no-load running, adjust tested generator output voltage to 50% of rated output voltage, tested synchronous generator is carried out to 5% voltage step test, in step process of the test, adopt the recorder data of electric weight recorder analyser to form output voltage curve and the field voltage curve of tested synchronous generator.
Output voltage curve for fear of tested synchronous generator environment temperature on tested synchronous generator and the impact of field voltage curve, cause the impact on final synchronous generator stator open circuit transient time-constant measurement result, in present embodiment, output voltage to tested synchronous generator and field voltage carry out standardization, the output voltage per-unit curve and the field voltage per-unit curve that obtain the tested synchronous generator after mark one, concrete grammar is as follows:
If any time, the perunit value of synchronous generator output voltage was Ut, any time, the perunit value of field voltage was Uf, any time, the output voltage values of tested synchronous generator was Ut_sc, tested synchronous generator rated output voltage value is Un, tested synchronizing generator voltage step test stable state field voltage value is Uf_w, tested synchronous generator stable state output voltage values is Ut_w, has following formula:
With generator output voltage perunit value Ut=Ut_sc/Un (1)
Field voltage perunit value Uf=(Ut_w/Uf_w/Un) * Uf_sc (2)
So, by output voltage curve and the field voltage curve of the tested synchronous generator that obtains before, the output voltage of tested synchronous generator and field voltage can be carried out to standardization, obtain output voltage per-unit curve and the field voltage per-unit curve of the tested synchronous generator after mark one.
Because tested synchronizing generator voltage step test stable state field voltage value Uf_w reads by field voltage curve, in order to eliminate the inaccurate impact bringing of value, can in the time of stable state, get what time calculating is averaged again by multiselect, after being tested synchronizing generator voltage step test stable state, multiple moment point different on field voltage curve are chosen several reading points, mean value using above-mentioned several reading point field voltage values is tested stable state field voltage value as tested synchronizing generator voltage step, read again the synchronous generator output voltage values of front each moment point (reading point), using the mean value of above-mentioned several moment point (reading point) synchronous generator output voltage values as tested synchronous generator stable state output voltage values.
Like this, draft stator open circuit transient time-constant in no-load simulation system, while carrying out voltage step test, using the input that adopts field voltage per-unit curve as the test of no-load simulation system voltage step, the output of no-load simulation system by the simulation curve that is synchronous generator output voltage per-unit curve.Further, in the time judging whether the stator open circuit transient time-constant of drafting in no-load simulation system can be used as the stator open circuit transient time-constant of tested synchronous generator, by adopt output voltage per-unit curve simulation curve rise time, overshoot and steady-state value whether with the deviation of the output voltage per-unit curve of tested synchronous generator all in default deviation range.Adopt per-unit curve to compare with adopting actual voltage value curve and compare, default deviation range is identical, is not repeated herein.
Again referring to Fig. 2, the stator open circuit transient time-constant of drafting in no-load simulation system
very unreasonable, and field voltage perunit value does not adopt method of the present invention to calculate, simulation curve (is the simulation curve of the synchronous generator output voltage per-unit curve of no-load simulation system output, Fig. 3 and Fig. 4 also with) with measured curve (be tested synchronous generator output voltage per-unit curve, Fig. 3 and Fig. 4 are also same) no matter be rise time, overshoot, or the deviation of steady-state value is all very large.
Again referring to Fig. 3, in order to complete as far as possible fast stator open circuit transient time-constant
test, the stator of drafting in no-load simulation system open circuit transient time-constant
time, be preferably and first choose stator open circuit transient time-constant that synchronous generator instructions provides as the stator open circuit transient time-constant of drafting in no-load simulation system
, in the present embodiment, the stator open circuit transient time-constant in synchronous generator instructions
for 8.6s.Through emulation again, the steady-state value of simulation curve and measured curve is consistent, but the overshoot of simulation curve has exceeded default deviation range, so, need to revise the stator open circuit transient time-constant of drafting in no-load simulation system
.
In the time that the overshoot of simulation curve is bigger than normal, should tune up the stator open circuit transient time-constant of drafting in no-load simulation system
otherwise,, should turn the stator open circuit transient time-constant of drafting in no-load simulation system down
, the stator open circuit transient time-constant of drafting
adjusting step-length for be preferably adopt 0.01s to 0.05s.
Referring to Fig. 4, in present embodiment, tune up the stator open circuit transient time-constant of drafting with the step-length of 0.05s again
and emulation draws simulation curve, through regulating several times, when the stator open circuit transient time-constant of drafting
when=8.85s, it is fine that simulation curve and measured curve coincide, and rise time, overshoot and the steady-state value of simulation curve all meets default deviation range, final, obtains the stator open circuit transient time-constant of tested synchronous generator
=8.85s.
Claims (10)
1. a measuring method for synchronous generator stator open circuit transient time-constant, is characterized in that, comprises the steps:
1) allow tested synchronous generator operate under idle condition, the output voltage of adjusting synchronous generator is less than the rated output voltage of synchronous generator, and makes field regulator operate in automatic channel;
2) tested synchronous generator is carried out to voltage step test, record output voltage curve and the field voltage curve of tested synchronous generator in step process of the test;
3) the no-load simulation system that adopts matlab/simulink to build tested synchronous generator, in no-load simulation system, draft stator open circuit transient time-constant, using step 2) in the tested alternator field voltage curve of record as the input of no-load simulation system, the simulation curve of output synchronous generator output voltage;
4) in the time that the deviation of rise time, overshoot and the steady-state value of described simulation curve and the output voltage curve of tested synchronous generator all meets default deviation range, stator open circuit transient time-constant by the stator open circuit transient time-constant of drafting in step 3) as tested synchronous generator, otherwise set-up procedure 3) in the stator open circuit transient time-constant drafted, until the rise time of simulation curve, overshoot and steady-state value all meet default deviation range, obtain the stator open circuit transient time-constant of tested synchronous generator.
2. the measuring method of a kind of synchronous generator stator open circuit transient time-constant according to claim 1, is characterized in that: in described step 1), and 50% to 70% of the rated output voltage that the output voltage of adjusting synchronous generator is synchronous generator.
3. the measuring method of a kind of synchronous generator stator open circuit transient time-constant according to claim 1, is characterized in that: the voltage step test in described step 2 is tested synchronous generator 3% to 5% voltage step test.
4. the measuring method of a kind of synchronous generator stator open circuit transient time-constant according to claim 1, it is characterized in that: described step 2) in, output voltage to tested synchronous generator and field voltage carry out standardization, obtain output voltage per-unit curve and the field voltage per-unit curve of the tested synchronous generator after mark one, described synchronous generator output voltage perunit value Ut=Ut_sc/Un, field voltage perunit value Uf=(Ut_w/Uf_w/Un) * Uf_sc, wherein, Ut_sc is the output voltage values of tested synchronous generator, Un is tested synchronous generator rated output voltage value, Uf_w is stable state field voltage value after tested synchronizing generator voltage step test, the tested synchronous generator stable state of Ut_w output voltage values.
5. the measuring method of a kind of synchronous generator stator open circuit transient time-constant according to claim 4, it is characterized in that: adopt after tested synchronizing generator voltage step test stable state, on field voltage curve, the mean value of the field voltage value of multiple moment point is as tested synchronizing generator voltage step test stable state field voltage value, before adopting the mean value of synchronizing generator voltage stator value of the each comfortable synchronization of field voltage value of multiple moment point as tested synchronous generator stable state output voltage values.
6. according to the measuring method of a kind of synchronous generator stator open circuit transient time-constant described in claim 4 or 5, it is characterized in that: in described step 3), input using field voltage per-unit curve as no-load simulation system, the simulation curve of no-load simulation system output synchronous generator output voltage per-unit curve.
7. the measuring method of a kind of synchronous generator stator open circuit transient time-constant according to claim 6, it is characterized in that: in described step 4), when rise time, overshoot and the steady-state value of simulation curve of described output voltage per-unit curve and the deviation of the output voltage per-unit curve of tested synchronous generator are during all in default deviation range, the stator open circuit transient time-constant by the stator open circuit transient time-constant of drafting in step 3) as tested synchronous generator.
8. the measuring method of a kind of synchronous generator stator open circuit transient time-constant according to claim 1, it is characterized in that: in the time that the overshoot of described simulation curve is bigger than normal, tune up the stator open circuit transient time-constant of drafting in step 3), otherwise turn the stator open circuit transient time-constant of drafting in step 3) down.
9. the measuring method of a kind of synchronous generator stator open circuit transient time-constant according to claim 8, is characterized in that: described in the adjusting step-length of the stator open circuit transient time-constant drafted be 0.01s to 0.05s.
10. the measuring method of a kind of synchronous generator stator open circuit transient time-constant according to claim 1, it is characterized in that: the default deviation range of described rise time is ± 0.005s, the default deviation range of described overshoot is ± 1%, and the default deviation range of described steady-state value is to be no more than step amount ± 1%.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104849661A (en) * | 2015-05-21 | 2015-08-19 | 中国大唐集团科学技术研究院有限公司华东分公司 | Method for testing capability of synchronous generator in adjusting voltage of main transformer high-voltage side bus |
| CN105932686A (en) * | 2016-05-20 | 2016-09-07 | 中国大唐集团科学技术研究院有限公司华东分公司 | Method for replacing station service work drive motor of power station with synchronous motor |
| CN106501719A (en) * | 2016-11-01 | 2017-03-15 | 广东电网有限责任公司电力科学研究院 | A kind of generator system equivalent time constant method of testing |
| CN106680714A (en) * | 2017-01-09 | 2017-05-17 | 南方电网科学研究院有限责任公司 | Method and device for computing gain of power units during normal operation of excitation systems |
| CN106684866A (en) * | 2017-01-09 | 2017-05-17 | 南方电网科学研究院有限责任公司 | Calculation method and apparatus for static state open loop comprehensive gain |
| CN106772028A (en) * | 2016-11-10 | 2017-05-31 | 华北电力大学（保定） | Short Circuit Between Generator Rotor Windings diagnostic device and method based on excitation step method |
| CN109782172A (en) * | 2019-01-29 | 2019-05-21 | 华中科技大学 | A kind of parameter of synchronous machine test measurement method |
| CN113824232A (en) * | 2021-09-10 | 2021-12-21 | 中船重工电机科技股份有限公司 | Time constant adjusting method for changing number of turns of stator winding and end structure of rotor |
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| CN104849661A (en) * | 2015-05-21 | 2015-08-19 | 中国大唐集团科学技术研究院有限公司华东分公司 | Method for testing capability of synchronous generator in adjusting voltage of main transformer high-voltage side bus |
| CN104849661B (en) * | 2015-05-21 | 2018-01-05 | 中国大唐集团科学技术研究院有限公司华东分公司 | Synchronous generator adjusts the method for testing of main transformer high side bus voltage ability |
| CN105932686A (en) * | 2016-05-20 | 2016-09-07 | 中国大唐集团科学技术研究院有限公司华东分公司 | Method for replacing station service work drive motor of power station with synchronous motor |
| CN105932686B (en) * | 2016-05-20 | 2018-06-15 | 中国大唐集团科学技术研究院有限公司华东分公司 | The method that power plant is replaced with to synchronous motor with work drive motor |
| CN106501719B (en) * | 2016-11-01 | 2019-02-12 | 广东电网有限责任公司电力科学研究院 | A kind of generator system equivalent time constant test method |
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| CN106772028B (en) * | 2016-11-10 | 2019-05-31 | 华北电力大学（保定） | Short Circuit Between Generator Rotor Windings diagnostic device and method based on excitation step method |
| CN106772028A (en) * | 2016-11-10 | 2017-05-31 | 华北电力大学（保定） | Short Circuit Between Generator Rotor Windings diagnostic device and method based on excitation step method |
| CN106680714A (en) * | 2017-01-09 | 2017-05-17 | 南方电网科学研究院有限责任公司 | Method and device for computing gain of power units during normal operation of excitation systems |
| CN106684866A (en) * | 2017-01-09 | 2017-05-17 | 南方电网科学研究院有限责任公司 | Calculation method and apparatus for static state open loop comprehensive gain |
| CN109782172A (en) * | 2019-01-29 | 2019-05-21 | 华中科技大学 | A kind of parameter of synchronous machine test measurement method |
| CN113824232A (en) * | 2021-09-10 | 2021-12-21 | 中船重工电机科技股份有限公司 | Time constant adjusting method for changing number of turns of stator winding and end structure of rotor |
| CN113824233A (en) * | 2021-09-10 | 2021-12-21 | 中船重工电机科技股份有限公司 | Time constant adjusting method based on simulation motor rotor winding end structure |
| CN113824233B (en) * | 2021-09-10 | 2023-08-11 | 中船重工电机科技股份有限公司 | Time constant adjusting method based on simulated motor rotor winding end structure |
| CN113824232B (en) * | 2021-09-10 | 2023-08-11 | 中船重工电机科技股份有限公司 | Time constant adjusting method based on changing number of turns of stator winding and rotor end structure |
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