CN106610473B - Electrical parameters measure method based on synchronous generator rest frequency response test - Google Patents
Electrical parameters measure method based on synchronous generator rest frequency response test Download PDFInfo
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Abstract
A kind of electrical parameters measure method based on synchronous generator rest frequency response test of the present invention, by the test data for obtaining synchronous motor asynchronous operation state under different slip frequencies, the recorder data of stator voltage and electric current, exciting current to different frequency is filtered, spectrum analysis, Park Transformation is carried out to stator voltage and electric current, respectively obtains ac-dc axis voltage and current；The stator voltage and stator current of respective frequencies, exciting current, the resistance of stator winding, ac-dc axis synchronous reactance be all known, solve the operational Impedance and excitation winding transmission function of different frequency, obtain the characteristic curve of frequency dependence, d-axis operational Impedance and quadrature axis operational Impedance frequency characteristic to acquisition, it carries out curve fitting, exports synchronous machine parameter.
Description
Technical field
The present invention is to belong to synchronous generator electrical-mechanical based on the parameter test method under synchronous generator rotor stationary state
Parameter measurement technology field.
Background technique
The capacity and scale of China's power grid increasingly increase, and security issues become increasingly urgent for electric system, the model of generator
The accuracy of important link with parameter as simulation calculation, parameter will directly influence Model for Stability Calculation of Power System result.
External characteristics is different at different frequencies for synchronous generator, for one or more frequencies, it may be necessary to Duo Taocan
Number.The method of operation is mended to mesh belt string in recent years, often having the point of large-scale pit-head power station in electric system, need to generator into
The research of row subsynchronous resonance analysis and suppression technology, needs one or more groups of parameters accurately to emulate in different shafting frequencies
Under generator external characteristics.
Generator parameter test relatively common at present is broadly divided into waving map method and frequency domain test method and root
The method for carrying out FEM calculation according to design parameter.
Waving map method mainly has (1) conventional type approval test carried out in motor manufacturing producer, and (no-load characteristic, short circuit are special
Property, Sudden Three-phase Short Circuit test and static two-phase rotation mensuration), this method can accurately determine d-axis parameter,
But accurate quadrature axis parameter cannot be provided.(2) load method is thrown, similar to sudden short circuit test above, by measuring disturbance suddenly
When motor variable time response carry out the characteristic of identifying motor.This test provides the data of d-axis and quadrature axis, but this
It is information of the motor in the case where running simultaneously operating condition and after super transition that test, which can obtain more abundant, and in test data
It is difficult to comprising changing relatively slow information, such as the information under asynchronous operation operating condition.
Frequency domain test method mainly has (1) IEEE GUIDE:TEST PROCEDURES FOR SYNCHRONOUS
The rest frequency response for the specific position that MACHINES (IEEE Std 115-1995) recommends, unit are in shutdown status (rotor
It is static), and and system sectionalizing, it is necessary to it harmonizes in two specific positions relative to stator, it is whole from 0.001~1000Hz with one
The low level power supply of a frequency range carrys out energized stator, two specific positions of rotor is harmonized for synchronous generator, i.e., directly
Shaft position and quadrature axis position are difficult, and the inaccuracy of position influences the error of parameter testing very big；(2) open loop frequency responds
Method, unit open running at low voltage, magnetic field measure the frequency response of excitation to stator with various frequency excitations, can only
Confirm certain data of the d-axis in intermediate frequency range；(3) online frequency response method, machine are connected to system by a big impedance,
Band is modulated close to rated load operation, excitation with sinusoidal random noise.With the component decomposed on two axis and it is similar to static
The data of frequency response method export a model.But the frequency range of this method data available is than rest frequency response method
It is smaller.
The parameter that the above test method obtains is for when studying Sub-synchronous Resonance, cannot all obtain and practical system
What system matched practices antipodal conclusion with Practical Project as a result, may result in.
Summary of the invention
It can be outside accurate description synchronous generator different frequency technical problem to be solved by the present invention lies in one kind is provided
The electrical parameters measure method of characteristic, this method obtain test synchronous generator using the test of synchronous generator rotor stationary state
The measurement data of electric parameter.
The present invention uses a kind of following scheme: electrical parameters measure side based on synchronous generator rest frequency response test
Method comprises the following steps:
A, the test data of synchronous motor asynchronous operation state under different slip frequencies is obtained, the test data is at least wrapped
Containing generator unit stator voltage, electric current and excitation winding electric current；
B, the recorder data of the stator voltage of different frequency and electric current, exciting current is filtered, spectrum analysis, to fixed
Sub- voltage and current carries out Park Transformation, respectively obtains ac-dc axis voltage and current；
C, the synchronous electricity of the stator voltage of different frequency and stator current, exciting current, the resistance of stator winding, ac-dc axis
It is anti-be all it is known that and meet the relationship of formula 1, establish the d-axis operational Impedance X of different frequencyd(j) and quadrature axis operational Impedance Xq(j)、
Excitation winding transmission function Gf(j) equation group, and solve
Formula 1
Wherein raStator DC resistance, j are the imaginary unit of plural number, Xd(j) and XqIt (j) is generator d-axis under the frequency
With the operational Impedance of quadrature axis, GfIt (j) is the excitation winding transmission function under the frequency；
d、Xd(j) and Xq(j)、Gf(j) the following relationship of satisfaction between the parameter of electric machine
Formula 2
xdFor direct-axis synchronous reactance, x 'dFor direct-axis transient reactance, xdIt " is d-axis ultra-transient reactance, Td' be d-axis transient state when
Between constant, Td" surpass transient time constant, T ' for d-axisdoD-axis transient time constant, T when opening a way for statordoIt " is opened for stator
D-axis when road surpasses transient time constant, xqFor quadrature axis synchronous reactance, x 'qFor quadrature axis transient reactance, xq" for the super transient state electricity of quadrature axis
Anti-, Tq' it is direct transient time constant, Tq" surpass transient time constant, x for quadrature axisadFor the d-axis reactance of armature reaction, TDσIt is straight
The leakage field time constant of axis Damper Winding, rfFor excitation winding resistance；Wherein xd、T’do、xq、ra、xadFor conventional synchronous generator
The parameter that can be accurately obtained in parameter measurement test, it is believed that be known parameters；
In general, xd、T'do、xq、ra、xadFor the parameter that can be accurately obtained in conventional synchronous generator type approval test, utilize
It is quasi- to carry out curve for the d-axis operational Impedance and quadrature axis operational Impedance, excitation winding transmission function frequency characteristic of 4 pairs of formula acquisitions
It closes, the electric parameter under test frequency, including x ' can be obtainedd、xd″、Td'、Td″、x′q、xq″、Tq'、Tq″、rf、TDσ。
Wherein stationary rotor is motionless at an arbitrary position, stator side by breaker access variable-frequency power sources, generator excitation around
Group is shorted；The two-phase being incorporated into breaker three-phase respectively, then it is incorporated into breaker three-phase, each final frequency can obtain three groups
Asymmetric stationary rotor status data, the stationary rotor status data of one group of three-phase symmetrical.
Variable-frequency power sources needed for present invention test is all sufficiently large in Whole frequency band (0.01Hz~100Hz) range content amount, this
The frequency response characteristic of synchronous motor can be depicted in Whole frequency band in invention, and the electric parameter of synchronous motor is non-linear with frequency
Variation, therefore different Frequency point, the parameter of synchronous motor be it is not identical, specific frequency point is selected according to actual requirement of engineering
Synchronize the parameter testing of motor, just can satisfy to motor different frequency point accurate description.
Detailed description of the invention
Fig. 1 is test connection of the invention.
Fig. 2 is the step flow chart that synchronous motor rest frequency response parameter of the invention surveys method of distinguishing.
Specific embodiment
As shown in Figure 1, the present invention uses single machine-experiment power supply mode of connection, excitation system is exited, excitation winding circuit
Pass through cable short circuit；The rotor of synchronous motor is stationary at an arbitrary position, dextral variable frequency supply frequency is set as a certain
Assigned frequency, the two-phase being incorporated into breaker three-phase respectively, then it is incorporated into breaker three-phase, in breaker actuation, start transient state
Recording acquisition device, start recording set end voltage, electric current and excitation winding electric current.After the data of acquisition certain period of time, break
Circuit breaker.Each final frequency can obtain three groups of asymmetric stationary rotor status datas, turn of one group of three-phase symmetrical
Sub- stationary state data.
Under stationary rotor state, when synchronous motor stator (three-phase or two-phase) access variable-frequency power sources when, stator voltage and
Stator current obtains ac-dc axis voltage, electric current by Park Transformation, and such as formula 3 and formula 4, wherein θ is between d-axis and A phase voltage phasor
Angle.
Formula 3
Formula 4
Wherein: UA, UB, UC, it is threephase stator voltage,IA, IB, IC, it is threephase stator electric current Ud, Uq, U0For three-phase ac-dc axis
Voltage, Id, Iq, I0,Three-phase ac-dc axis electric current.
There are the relationship of formula 1, X between ac-dc axis voltage, electric current and excitation winding electric currentd(j) and Xq(j)、Gf(j) and it is electric
The relationship for meeting formula 2 between machine parameter.
The wherein r of formula 1aStator is straight
Leakage resistance, j are the imaginary unit of plural number, IfFor excitation winding electric current, Xd(j) and XqIt (j) is generator under the frequency
The operational Impedance of d-axis and quadrature axis, GfIt (j) is the excitation winding transmission function under the frequency；
Formula 2
xdFor direct-axis synchronous reactance, x 'dFor direct-axis transient reactance, xdIt " is d-axis ultra-transient reactance, Td' be d-axis transient state when
Between constant, Td" surpass transient time constant, T' for d-axisdoD-axis transient time constant, T when opening a way for statordoIt " is opened for stator
D-axis when road surpasses transient time constant, xqFor quadrature axis synchronous reactance, x 'qFor quadrature axis transient reactance, xq" for the super transient state electricity of quadrature axis
Anti-, Tq' it is direct transient time constant, Tq" surpass transient time constant, x for quadrature axisadFor the d-axis reactance of armature reaction, TDσIt is straight
The leakage field time constant of axis Damper Winding, rfFor excitation winding resistance；Wherein xd、T’do、xq、ra、xadFor conventional synchronous generator
The parameter that can be accurately obtained in parameter measurement test, it is believed that be known parameters.
There are 4 groups of test datas for each frequency, establishes with Xd(j)、Xq(j)、Gf(j) it with the nonlinear equation of θ, solves
The X under the frequency is obtained afterwardsd(j)、Xq(j)、Gf(j).All electrical ginsengs of synchronous generator electrical characteristic are described in formula 1 and formula 2
Number includes xd、T'do、xq、ra、xad、x′d、xd″、T’d、Td″、x′q、xq″、T’q、Tq″、rf、TDσ, 15 are amounted to, wherein xd、
T'do、xq、ra、xadFor the parameter that can be accurately obtained in the measurement test of conventional synchronous generator parameter, it is believed that it is known parameters, benefit
It is fitted, can be obtained under selected frequency with d-axis and quadrature axis operational Impedance frequency characteristic of the formula 2 to selected frequency
Electric parameter, including x 'd、xd″、Td'、Td″、x′q、xq″、Tq'、Tq″、rf、TDσ。
The data volume for needing to measure in present invention test mainly has generator unit stator voltage, electric current and excitation winding electric current.
Test measurement equipment is high-precision electrical power system transient recorder, and instrument sample rate at least guarantees to send out in 2k or more synchronous
Related electric amount carries out whole recording record, including transient state in the transient process and steady-state process of motor rest frequency response test
Process and steady-state process.
Fig. 2 is the flow chart of test method of the present invention, is responded according to the generator rest frequency that above-mentioned test connection obtains
Test data brings generator unit stator voltage, electric current and the excitation winding current testing data under each frequency into formula 1 is established
Nonlinear equation, the ac-dc axis operational Impedance of output generator.It includes following steps:
1, test connection: motor excitation system to be measured exits, and excitation winding circuit is by cable short circuit, according to test connection
Carry out wiring.
2, the test data of synchronous motor stationary state under different frequency is obtained, the test data includes at least generator
Stator voltage, electric current and excitation winding electric current, each final frequency can obtain three groups of asymmetric stationary rotor status numbers
According to the stationary rotor status data of one group of three-phase symmetrical.
3, the recorder data of set end voltage and electric current, exciting current in four groups of test datas of different frequency is filtered
Wave, spectrum analysis carry out Park Transformation to set end voltage and electric current, obtain ac-dc axis voltage, electric current.
4, the stator voltage of each frequency and stator current, exciting current are to establish it is known that according to formula 1 with Xd(j)、Xq
(j)、Gf(j) with the nonlinear equation of θ, the X under the frequency is obtained after solutiond(j)、Xq(j)、Gf(j), it is each to solve different frequency
From asynchronous behavior ac-dc axis operational Impedance Xd(j)、Xq(j)、Gf(j)。
5, the operational Impedance of three frequencies is selected, is established with x 'd、xd″、T’d、Td″、x′q、xq″、T’q、Tq″、rf、TDσFor not
Know several nonlinear equations, wherein xd、T'do、xq、ra、xadAccurately to be obtained in the measurement test of conventional synchronous generator parameter
Parameter, it is believed that be known parameters, intended using d-axis and quadrature axis operational Impedance frequency characteristic of the formula 2 to selected frequency
It closes, the electric parameter under selected frequency, including x ' can be obtainedd、xd″、T’d、Td″、x′q、xq″、T’q、Tq″、rf、TDσ。
Claims (2)
1. a kind of electrical parameters measure method based on synchronous generator rest frequency response test, it is characterised in that: comprising such as
Lower step:
A, the test data of synchronous generator asynchronous operation state under different slip frequencies is obtained, the test data includes at least
Generator unit stator voltage, stator current and excitation winding electric current；
B, the recorder data of the stator voltage of different frequency, stator current and excitation winding electric current is filtered and frequency spectrum divides
Analysis carries out Park Transformation to stator voltage and stator current, respectively obtains ac-dc axis voltage and ac-dc axis electric current；
C, the stator voltage of respective frequencies, stator current, excitation winding electric current, stator winding resistance electricity synchronous with ac-dc axis
Anti- is all to solve the operational Impedance X of different frequency it is known that meet the relationship of following equationd(j)、Xq(j) it is passed with excitation winding
Delivery function Gf(j), the characteristic curve of frequency dependence is obtained:
Wherein, raFor the resistance of stator winding, j is the imaginary unit of plural number, Xd(j) and XqIt (j) is generator d-axis under the frequency
With the operational Impedance of quadrature axis, GfIt (j) is the excitation winding transmission function under the frequency, IdFor direct-axis current, IqFor quadrature axis current,
IfFor excitation winding electric current, UdFor direct-axis voltage, UqFor quadrature-axis voltage；
d、Xd(j) and Xq(j)、Gf(j) meet following relationship between Generator Parameters:
XdFor direct-axis synchronous reactance, x 'dFor direct-axis transient reactance, x "dFor d-axis ultra-transient reactance, T 'dIt is normal for the d-axis transient time
Number, T "dSurpass transient time constant, T ' for d-axisdoD-axis transient time constant, T " when opening a way for statordoWhen opening a way for stator
D-axis surpass transient time constant, xqFor quadrature axis synchronous reactance, x 'qFor quadrature axis transient reactance, x "qFor quadrature axis ultra-transient reactance,
T’qFor direct transient time constant, T "qSurpass transient time constant, X for quadrature axisadFor the d-axis reactance of armature reaction, TDσFor d-axis resistance
The leakage field time constant of Buddhist nun's winding, rfFor excitation winding resistance；Wherein xd、T’do、xq、ra、xadFor conventional synchronous generator pattern
The parameter that can be accurately obtained in test, it is believed that be known parameters；
D-axis operational Impedance and quadrature axis operational Impedance frequency characteristic to acquisition, are carried out curve fitting using formula 2, and output is same
Walk generator parameter.
2. the method as described in claim 1, it is characterised in that: obtain synchronous generator asynchronous operation shape under different slip frequencies
The test data of state, wherein stationary rotor is motionless at an arbitrary position, and stator side accesses variable-frequency power sources, synchronous generator by breaker
Machine excitation winding is shorted；The two-phase being incorporated into breaker three-phase respectively, then be incorporated into breaker three-phase, each final frequency can be with
Obtain three groups of asymmetric stationary rotor status datas, the stationary rotor status data of one group of three-phase symmetrical.
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| CN109490774B (en) * | 2018-10-31 | 2020-02-21 | 国网湖北省电力有限公司电力科学研究院 | Dynamic parameter test measurement method for solid rotor large phase modulation machine |
| CN110196392B (en) * | 2019-04-15 | 2020-10-30 | 华中科技大学 | Static testing method for d-axis and q-axis parameters of synchronous motor without rotor positioning |
| CN117148147B (en) * | 2023-10-26 | 2024-03-05 | 南方电网调峰调频发电有限公司 | Motor performance parameter determining method based on DC attenuation method of any rotor position |
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|---|---|---|---|---|
| CN1967278A (en) * | 2006-10-26 | 2007-05-23 | 丘昌涛 | Method and system for testing parameters of synchronization electric motor |
| CN101430365A (en) * | 2008-12-12 | 2009-05-13 | 南京工程学院 | Identification system and method for actually measured electric parameter of synchronous generator |
| CN102510263A (en) * | 2011-10-25 | 2012-06-20 | 中国电力科学研究院 | Method for identifying practical parameters of synchronous generator on basis of load rejection test and numerical difference |
| EP2693628A1 (en) * | 2011-03-30 | 2014-02-05 | Shenzhen Invt Electric Co., Ltd. | Method for identifying inductance parameters of synchronous electric machine and realization system thereof |
| CN103618492A (en) * | 2013-08-09 | 2014-03-05 | 国家电网公司 | Time-frequency transform based method for identifying parameters of synchronous generator |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967278A (en) * | 2006-10-26 | 2007-05-23 | 丘昌涛 | Method and system for testing parameters of synchronization electric motor |
| CN101430365A (en) * | 2008-12-12 | 2009-05-13 | 南京工程学院 | Identification system and method for actually measured electric parameter of synchronous generator |
| EP2693628A1 (en) * | 2011-03-30 | 2014-02-05 | Shenzhen Invt Electric Co., Ltd. | Method for identifying inductance parameters of synchronous electric machine and realization system thereof |
| CN102510263A (en) * | 2011-10-25 | 2012-06-20 | 中国电力科学研究院 | Method for identifying practical parameters of synchronous generator on basis of load rejection test and numerical difference |
| CN103618492A (en) * | 2013-08-09 | 2014-03-05 | 国家电网公司 | Time-frequency transform based method for identifying parameters of synchronous generator |
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