CN103823183B - A kind of measuring method of synchronous generator stator open circuit transient time-constant - Google Patents
A kind of measuring method of synchronous generator stator open circuit transient time-constant Download PDFInfo
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- CN103823183B CN103823183B CN201410071550.2A CN201410071550A CN103823183B CN 103823183 B CN103823183 B CN 103823183B CN 201410071550 A CN201410071550 A CN 201410071550A CN 103823183 B CN103823183 B CN 103823183B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 108
- 230000001052 transient effect Effects 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004088 simulation Methods 0.000 claims abstract description 57
- 230000005284 excitation Effects 0.000 claims abstract description 50
- 238000012360 testing method Methods 0.000 claims abstract description 30
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000002474 experimental method Methods 0.000 abstract description 3
- 238000010998 test method Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 7
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- 238000010276 construction Methods 0.000 description 1
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Abstract
During the present invention is to solve existing Modeling of excitation system, the method of traditional measurement generator unit stator open circuit transient time-constant is it is generally required to change primary circuit wiring, make to measure security requirement higher, the problem that experiment work amount is bigger, the measuring method of a kind of synchronous generator stator open circuit transient time-constant is provided, described measuring method, based on matlab/simulink platform building electromotor no-load simulation system, with actual measurement alternator field voltage for input, emulation draws generator output voltage curve, the measured curve of contrast generator output voltage and simulation curve, matching draws stator open circuit transient time-constant.The method of testing that the test that the present invention proposes combines with emulation matching, efficiently solves the problem that wiring is complicated, result accuracy is the highest of conventional test methods, has higher economy and practical value.
Description
Technical field
The present invention relates to Operation of Electric Systems and measure correlative technology field, saying further, relating to a kind of synchronous generator
The measuring method of machine stator open circuit transient time-constant, the synchronous generator stator in particular by self-shunt excitation system is opened a way
The measuring method of transient time-constant, to solve the survey of generator unit stator open circuit transient time-constant during Modeling of excitation system
Amount problem.
Background technology
Along with economic development, Power System Interconnection scale constantly increases, and power construction speed also synchronizes to accelerate.Heavy-duty generator
Safety and stability performance when group is incorporated into the power networks is related to the safety and stability of whole operation of power networks, and the excitation system pair of these units
The stable operation of unit plays again vital effect.Therefore, the regulation performance of excitation system when the new unit of Large Copacity puts into operation
The requirement of set grid-connection safe and stable operation can be met, become power system focus of attention.
Modeling of excitation system is to provide technical support and field surveillance service for generator excitation system commissioning tests
On the basis of, set up the excitation system model that can truly reflect unit control characteristic, and combine every commissioning tests waveform, point
Whether the regulation performance of analysis excitation system meets grid-connected requirement.Wherein, during Modeling of excitation system, generator unit stator is opened a way
Transient time-constant is very big on simulation result impact, and traditional measuring method changes primary circuit wiring, its safety due to needs
Property require high, experiment work amount is big.
Summary of the invention
During the present invention is to solve existing Modeling of excitation system, traditional measurement generator unit stator open circuit is normal for transition time
The method of number is it is generally required to change primary circuit wiring so that measure the problem that security requirement is higher, experiment work amount is bigger,
The measuring method of a kind of synchronous generator stator open circuit transient time-constant is provided.
Technical scheme is as follows:
The measuring method of a kind of synchronous generator stator open circuit transient time-constant, it is characterised in that comprise the steps:
1, allow tested synchronous generator operate under idle condition, adjust the output voltage of synchronous generator less than synchronizing to send out
The rated output voltage of motor, and make field regulator operate in automatic channel；
2, tested synchronous generator is carried out voltage step test, in record step process of the test, tested synchronous generator
Output voltage curve and excitation voltage curve；
3, matlab/simulink is used to build the no-load simulation system of tested synchronous generator, in no-load simulation system
In draft stator open circuit transient time-constant, in step 2 record tested alternator field voltage curve as zero load
The input of analogue system, the simulation curve of output synchronous generator output voltage；
4, bent when rise time, overshoot and the steady-state value of described simulation curve and the output voltage of tested synchronous generator
When the deviation of line is satisfied by predetermined deviation scope, the stator open circuit transient time-constant will drafted in step 3 as tested with
The stator open circuit transient time-constant of step electromotor, the stator otherwise drafted in set-up procedure 3 open circuit transient time-constant, until
The rise time of simulation curve, overshoot and steady-state value are satisfied by predetermined deviation scope, obtain the stator of tested synchronous generator
Open circuit transient time-constant.
In the present invention, in described step 1, adjust the specified output that output voltage the is synchronous generator electricity of synchronous generator
The 50% to 70% of pressure.
In the present invention, the voltage step test in described step 2 is tested for tested synchronous generator 3% to 5% voltage step.
In the present invention, in described step 2, output voltage and excitation voltage to tested synchronous generator carry out standardization,
Obtain output voltage per-unit curve and excitation voltage per-unit curve, the described synchronous generator of the tested synchronous generator after mark one
Output voltage perunit value Ut=Ut_sc/Un, excitation 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, and Uf_w is that tested synchronization is sent out
Electric moter voltage step test stable state excitation voltage value, Ut_w tested synchronous generator steady state output voltage value.
After using tested synchronizing generator voltage step test stable state, the excitation electricity of multiple moment point on excitation voltage curve
The meansigma methods of pressure value tests stable state excitation voltage value as tested synchronizing generator voltage step, before using multiple moment point
The meansigma methods of the synchronous generator output voltage values of each comfortable synchronization of excitation voltage value is as tested synchronous generator stable state
Output voltage values.
In described step 3, excitation voltage per-unit curve is exported as the input of no-load simulation system, no-load simulation system
The simulation curve of synchronous generator output voltage per-unit curve.
In described step 4, when the rise time of simulation curve, overshoot and the steady-state value of described output voltage per-unit curve
When being in predetermined deviation scope with the deviation of the output voltage per-unit curve of tested synchronous generator, will step 3 be drafted
Stator open circuit transient time-constant as tested synchronous generator stator open a way transient time-constant.
In the present invention, when the overshoot of described simulation curve is bigger than normal, when tuning up the stator open circuit transition drafted in step 3
Between constant, otherwise turn down step 3 is drafted stator open circuit transient time-constant.
The regulation step-length of the described stator open circuit transient time-constant drafted is 0.01s to 0.05s.
In the present invention, the predetermined deviation scope of described rise time is ± 0.005s, the predetermined deviation model of described overshoot
Enclose for ± 1%, the predetermined deviation scope of described steady-state value be less than step amount ± 1%.
The measuring method of synchronous generator stator of the present invention open circuit transient time-constant, it is proposed that test and emulate matching phase
In conjunction with method of testing, the present invention have need not change primary circuit wiring, the simple good characteristic of process of the test, the present invention
It is particularly suited for the measurement of the generator unit stator open circuit transient time constant of self-shunt excitation system, efficiently solves tradition examination
The problem that the wiring of proved recipe method is complicated, result accuracy is the highest, has higher economy and practical value.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention.
Fig. 2 is in voltage step test, synchronous generator output voltage per-unit curve and no-load simulation system emulation mark one
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 mark one
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 mark one
Curve, the contrast schematic diagram of the third situation.
Detailed description of the invention
Firstly, it is necessary to explanation, for synchronous generator, in particular by self-shunt excitation system, encouraging of electromotor
Magnetoelectricity pressure is field regulator output, is input to Generator's Rotor Circuit and carries out excitation, and the output voltage of electromotor is by stator
Output.
See Fig. 1, the measuring method of synchronous generator stator of the present invention open circuit transient time-constant, comprise the steps:
First, allow tested synchronous generator operate under idle condition, adjust the output voltage of synchronous generator less than same
The rated output voltage of step electromotor, and make field regulator operate in automatic channel.In order to obtain preferable measurement effect,
The output voltage of synchronous generator is preferably the 50% to 70% of the rated output voltage of synchronous generator, this is because,
The when that synchronizing generator voltage being less than 70%, electromotor is in unsaturation state, and its model is first order inertial loop, and is more than
The when of 70%, generator operation is in saturation region, and its model need to consider saturated characteristic, and model is relative complex；Self-shunt excitation system
Brownout cannot set up voltage, so the output voltage of synchronous generator can not be less than the 50% of rated output voltage, now
Excitation system is stable.
Then, tested synchronous generator carrying out voltage step test, voltage step test preferably uses tested same
Step electromotor 3% to 5% voltage step test, this is because, step amount is excessive is easily accessible field regulator amplitude limit district, step amount
Too small process is the most clear notable, and in step process of the test, the output voltage curve of tested synchronous generator and excitation are electric
Line of buckling carries out record, and recording process can use electricity recorder analyser to carry out, by the record wave number of electricity recorder analyser
According to forming curves.
Then, matlab/simulink is used to build the no-load simulation system of tested synchronous generator, in no-load simulation system
System is drafted stator open circuit transient time-constant, in previous step record tested alternator field voltage curve as
The input of no-load simulation system, here, is converted to excel file also by electricity recorder analyser to the recorder data of excitation voltage
Importing in matlab, those skilled in the art are not repeated known to this being herein, and finally, no-load simulation system exports
The simulation curve of synchronous generator output voltage；
Finally, by simulation curve and the tested synchronous generator of no-load simulation system output synchronous generator output voltage
Output voltage curve contrasts, when rise time, overshoot and steady-state value and tested synchronous generator defeated of simulation curve
Go out the deviation of voltage curve when being satisfied by predetermined deviation scope, no-load simulation system will draft stator open circuit normal for transition time
Number, as the stator open circuit transient time-constant of tested synchronous generator, otherwise adjusts in no-load simulation system and drafts stator open circuit
Transient time-constant, until the rise time of simulation curve, overshoot and steady-state value are satisfied by predetermined deviation scope, obtains tested
The stator open circuit transient time-constant of synchronous generator.Here, for the predetermined deviation model of rise time, overshoot and steady-state value
Enclose, be preferably that the predetermined deviation scope of rise time is ± output of 0.005s, i.e. simulation curve and tested synchronous generator
Voltage curve compares the deviation of rise time within ± 0.005s；The predetermined deviation scope of overshoot is ± 1%, i.e. emulates song
Line deviation of overshoot compared with the output voltage curve of tested synchronous generator is less than ± 1%；The predetermined deviation model of steady-state value
Enclose for less than step amount ± 1%, i.e. simulation curve steady-state value inclined compared with the output voltage curve of tested synchronous generator
Difference is less than ± 1%.
Seeing Fig. 2 to Fig. 4, the present invention, as a example by certain synchronous generator, uses the inventive method to measure generator unit stator
Open circuit transient time-constant, and the data and on-site actual situations provided in synchronous generator description are provided, verify this
The effectiveness of bright method.Specific implementation process is as follows:
When tested synchronous generator no-load running, adjust tested generator output voltage to the 50% of rated output voltage,
Tested synchronous generator is carried out 5% voltage step test, in step process of the test, uses the record ripple of electricity recorder analyser
Data form output voltage curve and the excitation voltage curve of tested synchronous generator.
In order to avoid tested synchronous generator ambient temperature is electric to output voltage curve and the excitation of tested synchronous generator
Buckle the impact of line, cause the impact on final synchronous generator stator open circuit transient time-constant measurement result, this embodiment party
In formula, output voltage and excitation voltage to tested synchronous generator carry out standardization, obtain the tested synchronous generator after mark one
The output voltage per-unit curve of machine and excitation voltage per-unit curve, concrete grammar is as follows:
If the perunit value of any time synchronous generator output voltage is Ut, the perunit value of any time excitation voltage is
Uf, the output voltage values of any time tested synchronous generator is Ut_sc, and tested synchronous generator rated output voltage value is
Un, tested synchronizing generator voltage step test stable state excitation voltage value is Uf_w, tested synchronous generator steady state output voltage
For Ut_w, there is below equation in value:
With generator output voltage perunit value Ut=Ut_sc/Un (1)
Excitation voltage perunit value Uf=(Ut_w/Uf_w/Un) * Uf_sc (2)
So, by the output voltage curve of tested synchronous generator obtained before and excitation voltage curve, can be by
The output voltage of tested synchronous generator and excitation voltage carry out standardization, obtain the output of the tested synchronous generator after mark one
Voltage per-unit curve and excitation voltage per-unit curve.
Owing to tested synchronizing generator voltage step test stable state excitation voltage value Uf_w is to be entered by excitation voltage curve
Row reads, and in order to eliminate the inaccurate impact brought of value, can choose some calculating more when stable state and average, i.e. again
After tested synchronizing generator voltage step test stable state, multiple moment point different on excitation voltage curve choose several reading
Point, using the meansigma methods of above-mentioned several reading point excitation voltage values as tested synchronizing generator voltage step test stable state excitation electricity
Pressure value, then before reading the synchronous generator output voltage values of each moment point (reading point), with above-mentioned several moment point (readings
Point) meansigma methods of synchronous generator output voltage values is as tested synchronous generator steady state output voltage value.
So, draft stator open circuit transient time-constant in no-load simulation system, when carrying out voltage step test, will use
The input that excitation voltage per-unit curve is tested as no-load simulation system voltage step, the output of no-load simulation system will be to synchronize
The simulation curve of generator output voltage per-unit curve.Further, the stator open circuit wink drafted in judging no-load simulation system
Become time constant whether can as the stator of tested synchronous generator open a way transient time-constant time, output voltage mark will be used
The rise time of simulation curve, overshoot and the steady-state value of the one curve is the most bent with the output voltage mark one of tested synchronous generator
The deviation of line is in predetermined deviation scope.Use per-unit curve to compare to compare with using actual voltage value curve,
Predetermined deviation scope is identical, is not repeated herein.
Referring back to Fig. 2, the stator drafted in no-load simulation system open circuit transient time-constantThe most unreasonable, and encourage
Magnetoelectricity pressure perunit value is provided without the method for the present invention and calculates, and (i.e. the synchronous generator of no-load simulation system output is defeated for simulation curve
Going out the simulation curve of voltage per-unit curve, Fig. 3 and Fig. 4 is also same) and measured curve (the most tested synchronous generator output voltage mark one
Curve, Fig. 3 and Fig. 4 also with) either the deviation of rise time, overshoot, or steady-state value the biggest.
Referring back to Fig. 3, in order to be rapidly completed transient time-constant that stator is opened a way as far as possibleTest, zero load imitate
The stator open circuit transient time-constant drafted in true systemTime, first choosing synchronous generator description provides
Stator open circuit transient time-constant as no-load simulation system is drafted stator open circuit transient time-constant, this enforcement
Stator open circuit transient time-constant in example, in synchronous generator descriptionFor 8.6s.Through again emulating, simulation curve
Consistent with the steady-state value of measured curve, but the overshoot of simulation curve is beyond predetermined deviation scope, then, need amendment zero load
The stator open circuit transient time-constant drafted in analogue system。
When the overshoot of simulation curve is bigger than normal, it should tune up the stator drafted in no-load simulation system and open a way transition time
ConstantOtherwise, it should turn the stator open circuit transient time-constant drafted in no-load simulation system down, the stator drafted is opened
Road transient time-constantRegulation step-length preferably be use 0.01s to 0.05s.
Referring back to Fig. 4, in present embodiment, tune up the stator open circuit transient time-constant drafted with the step-length of 0.05s
And emulation draws simulation curve, regulate through several times, when the stator open circuit transient time-constant draftedDuring=8.85s, emulation
Curve is fine with what measured curve coincide, and the rise time of simulation curve, overshoot and steady-state value are satisfied by predetermined deviation scope,
Finally, the stator open circuit transient time-constant of tested synchronous generator is obtained=8.85s。
Claims (9)
1. the measuring method of a synchronous generator stator open circuit transient time-constant, it is characterised in that comprise the steps:
1) allow tested synchronous generator operate under idle condition, adjust the output voltage of synchronous generator less than synchronous generator
Rated output voltage, and make field regulator operate in automatic channel；
2) tested synchronous generator is carried out voltage step test, the output of tested synchronous generator in record step process of the test
Voltage curve and excitation voltage curve；
3) use matlab/simulink to build the no-load simulation system of tested synchronous generator, intend in no-load simulation system
Stator open circuit transient time-constant, using step 2) in record tested alternator field voltage curve as no-load simulation
The input of system, the simulation curve of output synchronous generator output voltage；
4) when the output voltage curve of rise time, overshoot and steady-state value and tested synchronous generator of described simulation curve
When deviation is satisfied by predetermined deviation scope, the stator open circuit transient time-constant will drafted in step 3) is sent out as tested synchronization
Stator open circuit transient time-constant, otherwise set-up procedure 3 of motor) in the stator open circuit transient time-constant drafted, until imitative
The rise time of true curve, overshoot and steady-state value are satisfied by predetermined deviation scope, and the stator obtaining tested synchronous generator is opened
Road transient time-constant.
The measuring method of a kind of synchronous generator stator the most according to claim 1 open circuit transient time-constant, its feature
Be: in described step 1), adjust synchronous generator the rated output voltage that output voltage is synchronous generator 50% to
70%。
The measuring method of a kind of synchronous generator stator the most according to claim 1 open circuit transient time-constant, its feature
It is: the voltage step test in described step 2 is tested for tested synchronous generator 3% to 5% voltage step.
The measuring method of a kind of synchronous generator stator the most according to claim 1 open circuit transient time-constant, its feature
It is: described step 2) in, output voltage and excitation voltage to tested synchronous generator carry out standardization, after obtaining mark one
The output voltage per-unit curve of tested synchronous generator and excitation voltage per-unit curve, described synchronous generator output voltage mark one
Value Ut=Ut_sc/Un, excitation voltage perunit value Uf=(Ut_w/Uf_w/Un) * Uf_sc, wherein, Ut_sc is tested synchronous generator
The output voltage values of machine, Un is tested synchronous generator rated output voltage value, and Uf_w is tested synchronizing generator voltage step
Stable state excitation voltage value after test, Ut_w tested synchronous generator steady state output voltage value.
The measuring method of a kind of synchronous generator stator the most according to claim 4 open circuit transient time-constant, its feature
Be: in described step 3), using excitation voltage per-unit curve as the input of no-load simulation system, the output of no-load simulation system with
The simulation curve of step generator output voltage per-unit curve.
The measuring method of a kind of synchronous generator stator the most according to claim 5 open circuit transient time-constant, its feature
Be: in described step 4), when described output voltage per-unit curve the rise time of simulation curve, overshoot and steady-state value with
When the deviation of the output voltage per-unit curve of tested synchronous generator is in predetermined deviation scope, will step 3) be drafted
Stator open circuit transient time-constant is as the stator open circuit transient time-constant of tested synchronous generator.
The measuring method of a kind of synchronous generator stator the most according to claim 1 open circuit transient time-constant, its feature
It is: when the overshoot of described simulation curve is bigger than normal, tunes up the stator open circuit transient time-constant drafted in step 3), otherwise
Turn the stator open circuit transient time-constant drafted in step 3) down.
The measuring method of a kind of synchronous generator stator the most according to claim 7 open circuit transient time-constant, its feature
Be: described in draft stator open circuit transient time-constant regulation step-length be 0.01s to 0.05s.
The measuring method of a kind of synchronous generator stator the most according to claim 1 open circuit transient time-constant, its feature
It is: the predetermined deviation scope of described rise time is ± 0.005s, and the predetermined deviation scope of described overshoot is ± 1%, described
The predetermined deviation scope of steady-state value be less than step amount ± 1%.
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| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| CN109782172B (en) * | 2019-01-29 | 2020-05-19 | 华中科技大学 | Synchronous motor parameter test measurement method |
| 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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| EP1729141B1 (en) * | 2005-06-02 | 2008-10-29 | ABB Oy | Method for estimating the rotor time constant of an induction machine |
| JP5369596B2 (en) * | 2008-10-15 | 2013-12-18 | 株式会社明電舎 | Generator dynamic characteristic test equipment |
| CN102073012B (en) * | 2009-11-20 | 2013-03-20 | 华北电力科学研究院有限责任公司 | Method and system for obtaining parameters of synchronous generator |
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