CN107508295A - A kind of PSS4B parameter regulation adaptive methods based on wide area measurement - Google Patents

A kind of PSS4B parameter regulation adaptive methods based on wide area measurement Download PDF

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Publication number
CN107508295A
CN107508295A CN201710985302.2A CN201710985302A CN107508295A CN 107508295 A CN107508295 A CN 107508295A CN 201710985302 A CN201710985302 A CN 201710985302A CN 107508295 A CN107508295 A CN 107508295A
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pss4b
phase
parameters
frequency
angle
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齐郑
庄舒仪
张红颖
王官宏
李莹
李文峰
赵红生
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
North China Electric Power University
State Grid Hubei Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
North China Electric Power University
State Grid Hubei Electric Power Co Ltd
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Priority to CN201710985302.2A priority Critical patent/CN107508295A/en
Publication of CN107508295A publication Critical patent/CN107508295A/en
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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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a kind of PSS4B parameter regulation adaptive methods based on wide area measurement.First, power network real time execution parameter is obtained based on wide area measurement technology, uncompensated frequency response characteristic, multilevel iudge PSS need to compensate phase difference analysis power network measurement excitation system online.Second, the system to be differed greatly for the uncompensated frequency response characteristic of excitation system, by current system data, the PSS4B partial parameters of important generating set are adjusted using SCE UA algorithms, realize the phase compensation to system.Emphasis of the present invention solves the problems, such as PSS4B definite values model to different power network scale adaptability deficiencies, it is numerous in view of PSS4B model parameters, it is not easy to adjust, the present invention adjusts the PSS4B parameters of important unit using SCE UA, in senior middle school, low frequency improves system damping as far as possible, to better conform to current excitation system frequency response characteristic.

Description

A kind of PSS4B parameter regulation adaptive methods based on wide area measurement
Technical field
The invention belongs to field of power, more particularly to a kind of PSS4B parameter regulations adaptation side based on wide area measurement Method.
Background technology
The U.S. the sixties line tripping caused by interconnection low-frequency oscillation and cause the system failure, opened in 1969 Increase the negative-feedback of power in excitation system to improve power system damping, referred to as power system stabilizer, PSS (PSS), this mark PSS formal proposition and resulting in promoting the use of energetically, this is the state for clearly proposing PSS earliest so far Family.2000, in order to solve the problems, such as ultra-low frequency oscillation, the concept of a new PSS model was contemplated in Canada, later quilt 421.5 editions standards of IEEE of sub-committee of Institute of Electrical and Electric Engineers excitation group revision are included, and are named as PSS4B. The advantages of PSS4B, is obvious, due to there is three branches, can carry out the adjustment of gain in three frequency ranges interested respectively, And it is smaller to interact, while by setting the compensation tache of lead-lag in each frequency range, angle is adjusted accordingly, with Meet the requirement under the pattern of various different oscillation dampings.But because the gain of high band is higher, can be by high band The trapper and independent gain for setting high band are set, and are made the gain reduction of high frequency, are mitigated the risk of torsional oscillation vibration.
[multiband power system stabilizer, PSS compliance test result [J] the power systems of the such as Yuan Yazhou based on RTDS are automatic for document Change, 2013] PSS4B simulation analysis have been carried out based on RTDS, PSS4B parameters are adjusted by different centre frequencies, and test Inhibitions of the PSS4B in basic, normal, high frequency range to power system oscillation is demonstrate,proved, but the PSS4B that the method is adjusted is in high band The phase compensation amount of offer is still smaller；Document [Qiu Lei, Wang Kewen, Li Kuikui, waits multiband PSS structure designs and parameter coordination [J] electric power system protection and controls, 2011] it is applied to effect during multi-computer system by the simulating, verifying PSS4B of multi-computer system Fruit, but it is still to be applied to PSS4B to emulate what is obtained in the less excitation system of hysteresis characteristic；[the super of Wu Jian suppress document The analysis of the power system stabilizer, PSS of ultra-low frequency oscillation and research [D] Beijing：China Electric Power Research Institute, 2014.] analysis Point out that PSS4B under canonical parameter is advanced smaller in the phase that high band provides after PSS4B frequency characteristic, to hysteresis characteristic compared with Big system can not provide good compensation, but not propose a solution.To PSS4B parameter tuning methods also not at present The preferable application method of each frequency range compensation effect can be reached, and parameter tuning is based on unit model, to running scale For the system of change, might not there can be preferable phase compensation effect.
The content of the invention
For solve PSS4B parameter tuning difficulty it is big, it is not strong to operation of power networks scale adaptability the problem of, the present invention proposes A kind of PSS4B parameter regulation adaptive methods based on wide area measurement.
The present invention specifically uses following technical scheme：
A kind of PSS4B parameter regulation adaptive methods based on wide area measurement, it is characterised in that：
First, power network real time execution parameter, the analysis power network measurement online nothing of excitation system are obtained based on wide area measurement technology Frequency response characteristic is compensated, multilevel iudge PSS4B needs to compensate phase difference.Second, rung for the uncompensated frequency of excitation system The system that property difference is larger is answered, by current system data, the PSS4B parts of important generating set are adjusted using SCE-UA algorithms Parameter, realize the phase compensation to system.
For the wind-powered electricity generation station equivalent modeling method of complex topology, it is characterised in that the described method comprises the following steps：
(1) wide area phase measurement links obtain power network real-time running data；
(2) real-time phase data are based on, analysis power network measures excitation system uncompensated frequency response characteristic online, compares and sentence Disconnected PSS4B needs to compensate phase difference, judges whether power network scale has larger change；
(3) if power network scale will not vary widely in future, current PSS4B parameters are kept to run, conversely, then using SCE-UA algorithms are adjusted to the PSS4B parameters of important unit.
(4) PSS4B phase compensation effect is verified.
In step (2), analyze real-time wide area measurement data and judge that power network scale changes, specifically include herein below：
By wide area measurement technical limit spacing generator electromagnetic torque phase angle, the frequency response characteristic of analysis integrated compensation Curve g (f)=φ, wherein f are system frequency, folders of the φ between electromagnetic torque increment and generator frequency difference Δ ω Angle, and calculate centre frequency critical range fL±0.05Hz、fM±0.05Hz、fH± 0.05Hz synthesis phase angle andWherein, fL、fM、fHFor PSS4B phase compensations set it is low, The centre frequency of medium, high frequency.
Phase values are calculated in real time and are contrasted with comprehensive compensation effect after current PSS4B parameter tunings, if both differences More than a certain limitation, you can judge that power network scale is varied widely, current PSS4B parameters can not meet the phase of excitation system Position compensates requirement, it is necessary to be adjusted in good time, then goes to step (3)；If difference is little, continues detection and compare.
Angle and angle values in the present invention use angle system, represent electromagnetic power in Δ ω-Δ δ planes with Δ ω The angle of axle.On the occasion of the angle for representing advanced Δ ω axles, negative value represents the angle of lag Δ ω axles.
In step (3), PSS4B parameters are adjusted using SCE-UA algorithms, specifically include herein below：
1) current PSS4B compensation phase angle is calculated, is subtracted by frequency response characteristic g (f)=φ of comprehensive compensation PSS4B compensation phase angles are the uncompensated response characteristic that can obtain excitation system, electromagnetic torque increment and generator frequency when uncompensated Angle between rate difference Δ ω is φ0, the phase angle after comprehensive compensation is φ.PSS4B model parameters are set to meetWhereinFor PSS4B compensation phase angle, therefore the present invention uses compensation phase of the object function for each frequency range Poor sumK represents number of samples in formula,Phase is compensated for the PSS4B of the fi sampled point Angle,For the uncompensated phase angle of the fi sampled point.Constraints KD.PSS+KD0>The damped coefficient K that 0, i.e. PSS4B are providedD.PSS With it is uncompensated when system damping COEFFICIENT KD0Sum is just.
2) PSS4B parameters to be optimized are determined, it is as follows：KL1、KL2Low-band signal multiplication factor, KI1、KI2Intermediate frequency segment signal Multiplication factor, KH1、KH2High band Regulate signal multiplication factor, TL5、TL6、TL11、TL12Low-frequency range phase shift link time constant, TI5、TI6、TI11、TI12Mid Frequency phase shift link time constant, TH5、TH6、TH11、TH12High band phase shift link time constant, totally 18 Individual parameter.When system scale change needs to adjust PSS4B parameters, it can only optimize KL1、KI1、KH1、TL5、TL6、TI5、TI6、TH5、 TH6This 9 parameters.
3) program initialization.The parameter of SCE-UA algorithms is set：System dimension n=9, participate in the compound number w to evolve =3, each compound number of vertex d=2n+1, the compound number of vertex d of sonn=n+1, each compound generation offspring number δ= 1, evolution number λ=2n+1, sample point number m=w × d.
4) randomly generate m sample point, calculate each point target function value f, and according to target function value by it is small to Big order sequence, M is designated as by the data group after sequence.
5) divide compound colony, by the data group M of step 4) be divided into w it is compound, to each compound carry out CCE Evolutionary computation, the random filial generation as caused by the superiority-inferiority screening parent individuality of target function value, is ultimately formed after genetic evolution Optimization colony.
6) the compound colony after evolution is mixed, re-starts the ascending sort of object function, form data group M, really It is fixed whether to meet the condition of convergenceAnd KD.PSS+KD0>0.If meeting the condition of convergence, terminate program, If being unsatisfactory for the condition of convergence, continue step 5).
In step (4), PSS4B phase compensation effect is verified, specifically includes herein below：
Each parameters of PSS4B are adjusted using Optimal Parameters, excitation system and PSS4B transmission function are analyzed, obtained The amplitude-frequency and phase characteristic of whole system, electromagnetic torque phase angle characteristics on Δ ω-Δ δ coordinate planes are paid close attention to, when the PSS4B joins Number can make the damping torque i.e. electromagnetic torque of electromagnetic torque Δ ω positive directions with phase torque for just, then it represents that this group of parameter System balance is worked well.
There is certain adaptability to system scale to verify PSS4B parameters, small interference analysis further verification should be passed through The damping characteristic of whole system, searching system whether there is negative damping and underdamping pattern, be with important unit associative mode When being damped more than medium, show that this group of Optimal Parameters have stronger adaptability to current power network scale.
The beneficial effects of the present invention are：
A kind of PSS4B parameter regulation adaptive methods based on wide area measurement proposed by the invention, invention emphasis solve The problem of PSS4B definite values model is to different power network scale adaptability deficiencies, it is contemplated that PSS4B model parameters are numerous, are not easy to adjust, The present invention adjusts the PSS4B parameters of important unit using SCE-UA, and in senior middle school, low frequency improves system damping as far as possible, with more Current excitation system frequency response characteristic is adapted to well.By the phase compensation method of calibration of correlation, verify and adjusted using SCE-UA Important unit PSS4B parameters have good adaptability to current network.
Brief description of the drawings
Fig. 1 is PSS4B transfer function model figures；
Fig. 2 is the compensation effect figure that SCE-UA algorithms adjust PSS4B parameters；
Fig. 3 is to adjust design sketch after PSS4B parameters again after power network scale changes；
Fig. 4 is a kind of PSS4B parameter regulation adaptive method flow charts based on wide area measurement proposed by the present invention.
Embodiment
Technical scheme is further described in detail with reference to Figure of description and instantiation.
The present invention proposes a kind of PSS4B parameter regulation adaptive methods based on wide area measurement, solves PSS4B parameter tunings Difficulty is big, it is not strong to operation of power networks scale adaptability the problem of.
The advantages of PSS4B, is obvious, due to there is three branches, can carry out the tune of gain in senior middle school's low-frequency range respectively Whole, every section has a centre frequency wave filter group into and it is smaller to interact, while by setting lead-lag in each frequency range Compensation tache, angle is adjusted accordingly, to meet the requirement under the pattern of various different oscillation dampings,.If system is advised Moding, then current PSS4B parameters can be caused not good enough to system damping compensation effect, it is necessary to be matched somebody with somebody again to PSS4B parameters Put, it is contemplated that PSS4B parameters are numerous, adjust that difficulty is big, and influence of the system scale change to phase compensation is smaller, therefore Parameter tuning is carried out using PSS4B simplified model, remaining parameter uses original setting valve.
Present invention mainly includes following 2 contents：
First, power network real time execution parameter, the analysis power network measurement online nothing of excitation system are obtained based on wide area measurement technology Frequency response characteristic is compensated, multilevel iudge PSS4B needs to compensate phase difference.Second, rung for the uncompensated frequency of excitation system The system that property difference is larger is answered, by current system data, the PSS4B parts of important generating set are adjusted using SCE-UA algorithms Parameter, realize the phase compensation to system.
The calculation process of PSS4B parameter tuning processes is as illustrated, including following four step：
(1) wide area phase measurement links obtain power network real-time running data；
(2) real-time phase data are based on, analysis power network measures excitation system uncompensated frequency response characteristic online, compares and sentence Disconnected PSS4B needs to compensate phase difference, judges whether power network scale has larger change；
Generally, power network scale is divided into big network operation and small network operation, when maximum single-machine capacity ratio is less than 8% When, it is believed that power network is big network operation, otherwise is small network operation, and the small net of wherein isolated operation is referred to as isolated network.In the present invention, not office It is limited to the definition of maximum single-machine capacity Compare System scale, but is according to obtained by the lienarized equation solution of whole power network The damping change size for each oscillation mode of uniting.
By wide area measurement technical limit spacing generator electromagnetic torque phase angle, the frequency response characteristic of analysis integrated compensation Curve g (f)=φ, wherein f are system frequency, angles of the φ between electromagnetic torque increment and generator frequency difference Δ ω, And calculate centre frequency critical range fL±0.05Hz、fM±0.05Hz、fH± 0.05Hz synthesis phase angle andWherein, fL、fM、fHFor PSS4B phase compensations set it is low, The centre frequency of medium, high frequency.
Phase values are calculated in real time and are contrasted with comprehensive compensation effect after current PSS4B parameter tunings, if both differences More than a certain limitation, you can judge that power network scale is varied widely, current PSS4B parameters can not meet the phase of excitation system Position compensates requirement, it is necessary to be adjusted in good time, then goes to step (3)；If difference is little, continues detection and compare.
Angle and angle values in the present invention use angle system, represent electromagnetic power in Δ ω-Δ δ planes with Δ ω The angle of axle, on the occasion of the angle for representing advanced Δ ω axles, negative value represents the angle of lag Δ ω axles.
(3) if power network scale will not vary widely in future, current PSS4B parameters are kept to run, conversely, then using SCE-UA algorithms are adjusted to the PSS4B parameters of important unit.
PSS4B parameters are adjusted using SCE-UA algorithms, specifically include herein below：
1) current PSS4B compensation phase angle is calculated, is subtracted by frequency response characteristic g (f)=φ of comprehensive compensation PSS4B compensation phase angles are the uncompensated response characteristic that can obtain excitation system, and electromagnetic torque increment is with generating electricity when uncompensated Angle between unit frequency difference Δ w is φ0, the phase angle after comprehensive compensation is φ.PSS4B model parameters are set to meetWhereinFor PSS4B compensation phase angle, therefore the present invention uses compensation phase of the object function for each frequency range Poor sumK represents number of samples in formula,Phase is compensated for the PSS4B of the fi sampled point Angle,For the uncompensated phase angle of the fi sampled point.Constraints KD.PSS+KD0>The damped coefficient K that 0, i.e. PSS4B are providedD.PSS With it is uncompensated when system damping COEFFICIENT KD0Sum is just.
2) PSS4B parameters to be optimized are determined, it is as follows：KL1、KL2Low-band signal multiplication factor, KI1、KI2Intermediate frequency segment signal Multiplication factor, KH1、KH2High band Regulate signal multiplication factor, TL5、TL6、TL11、TL12Low-frequency range phase shift link time constant, TI5、TI6、TI11、TI12Mid Frequency phase shift link time constant, TH5、TH6、TH11、TH12High band phase shift link time constant, totally 18 Individual parameter.When needing to adjust PSS4B parameters because of system scale change, it can only optimize KL1、KI1、KH1、TL5、TL6、TI5、 TI6、TH5、TH6This 9 parameters.
3) program initialization.The parameter of SCE-UA algorithms is set：System dimension n=9, participate in the compound number w to evolve =3, each compound number of vertex d=2n+1, the compound number of vertex d of sonn=n+1, each compound generation offspring number δ= 1, evolution number λ=2n+1, sample point number m=w × d.
4) randomly generate m sample point, calculate each point target function value f, and according to target function value by it is small to Big order sequence, M is designated as by the data group after sequence.
5) divide compound colony, by the data group M of step 4) be divided into w it is compound, to each compound carry out CCE Evolutionary computation, the random filial generation as caused by the superiority-inferiority screening parent individuality of target function value, is ultimately formed after genetic evolution Optimization colony.
6) the compound colony after evolution is mixed, re-starts the ascending sort of object function, form data group M, really It is fixed whether to meet the condition of convergenceAnd KD.PSS+KD0>0.If meeting the condition of convergence, terminate program, If being unsatisfactory for the condition of convergence, continue step 5).
(4) PSS4B phase compensation effect is verified.
Each parameters of PSS4B are adjusted using Optimal Parameters, excitation system and PSS4B transmission function are analyzed, obtained The amplitude-frequency and phase characteristic of whole system, electromagnetic torque phase angle characteristics on Δ ω-Δ δ coordinate planes are paid close attention to, when the PSS4B joins Number can make the damping torque i.e. electromagnetic torque of electromagnetic torque Δ ω positive directions with phase torque for just, then it represents that this group of parameter System balance is worked well.
There is certain adaptability to system scale to verify PSS4B parameters, small interference analysis further verification should be passed through The damping characteristic of whole system, searching system whether there is negative damping and underdamping pattern, be with important unit associative mode When being damped more than medium, show that this group of Optimal Parameters have stronger adaptability to current power network scale.
Provide that PSS output torques vector is in 0.2Hz~2.0Hz frequencies according to the PSS directive/guides of Guo Wang companies and Nan Wang companies In the range of lag Δ ω axles angle between -10 ° to -45 °, for PSS models, if with φ0Represent excitation system output The uncompensated phase of electromagnetic power lag Δ ω axles, the phase of PSS phase compensation links is represented with φ p, then require PSS parameter Select to cause in 0.2-2.0Hz frequency ranges, φsum=φp+φe=10 ° to -45 °.φsumRepresent what simulation calculation went out The online phase angle for having each Frequency point in compensation frequency characteristic.
By taking certain typical generator in system as an example, phase compensation effect of the PSS4B parameter tuning methods to system is verified, The uncompensated frequency response characteristic of excitation system is as shown in table 2., the basic, normal, high frequency of selection PSS4B phase compensation settings Centre frequency fL、fM、fH.The PSS4B parameter values of the generator are adjusted according to above-mentioned SCE-UA algorithms, as shown in table 1, its is right The offset angle of system is as shown in table 2.Calculate phase=-661.22 °.
The PSS4B setting parameter values of table 1
Low frequency center 0 Intermediate frequency center 0 High frequency center 7
TL3/TL9 1 TI3/TI9 0 TH3/TH9 0
TL4/TL10 1 TI4/TI10 1 TH4/TH10 0
TL5/TL11 4 TI5/TI11 0 TH5/TH11 0
TL6/TL12 5 TI6/TI12 1 TH6/TH12 0
KL 1 KI 9 KH 9
The frequency response characteristic of the system of table 2
Frequency (Hz) Uncompensated phase angle (°) PSS4B offset angles (°) Phase angle (°) after compensation
0.01 -17.3 34.9706 17.6706
0.05 -25.4 20.97246 -4.42754
0.1 -33.8 5.0178 -28.7822
0.15 -48.2 3.4993 -44.7007
0.2 -65.1 0.7956 -64.3044
0.3 -73.3 15.51643 -57.78357
0.4 -100 20.9628 -79.0372
0.5 -105 28.6679 -76.3321
0.6 -108 34.3446 -73.6554
0.7 -109 39.7659 -69.2341
0.8 -107 45.8286 -61.1714
0.9 -109 52.6918 -56.3082
1 -105 59.9708 -45.0292
1.1 -108 67.0236 -40.9764
1.2 -106 73.2871 -32.7129
1.3 -110 78.4724 -31.5276
1.4 -113 82.5513 -30.4487
1.5 -117 85.6451 -31.3549
1.6 -112 87.9251 -24.0749
1.7 -117 89.5582 -27.4418
1.8 -114 90.6856 -23.3144
1.9 -120 91.4195 -28.5805
2 -112 91.8464 -20.1536
In 100s because failure cuts isolated power grid, the big speed regulator of the typical generator also switches the system of stable operation To isolated network mode parameter, the generator of isolated power grid is influenceed by system scale change, and uncompensated angle values also occur necessarily to become Change, phase=-726.90 °, change greatly, it is necessary to be adjusted again to the PSS4B parameters of generator, after adjusting again PSS phase compensation effects are as shown in the figure.Check results are analyzed by small interference to also indicate that before and after PSS4B parameter tunings to system Influence of damping characteristics is larger, and the PSS4B parameters after adjusting can more adapt to current electric grid scale, improves system damping spy Property.
A kind of PSS4B parameter regulation adaptive methods based on wide area measurement proposed by the invention, emphasis solve PSS4B The problem of definite value model is to different power network scale adaptability deficiencies, it is contemplated that PSS4B model parameters are numerous, are not easy to adjust, this hair The bright PSS4B parameters that important unit is adjusted using SCE-UA, in senior middle school, low frequency improves system damping as far as possible, with more preferably suitable Should preceding excitation system frequency response characteristic.The weight adjusted by the phase compensation method of calibration of correlation, checking using SCE-UA Unit PSS4B parameters are wanted to have good adaptability to current network.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, Any people for being familiar with the technology disclosed herein technical scope in, the change or replacement that can readily occur in should all be covered Within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.

Claims (4)

  1. A kind of 1. PSS4B parameter regulation adaptive methods based on wide area measurement, it is characterised in that：
    First, power network real time execution parameter is obtained based on wide area measurement technology, analysis power network measurement excitation system is uncompensated online Frequency response characteristic, multilevel iudge PSS need to compensate phase difference.Second, for the uncompensated frequency response characteristic of excitation system The system to differ greatly, by current system data, the PSS4B partial parameters of important generating set are adjusted using SCE-UA algorithms, Realize the phase compensation to system.
  2. 2. a kind of PSS4B parameter regulation adaptive methods based on wide area measurement, it is characterised in that methods described includes following step Suddenly：
    (1) wide area phase measurement links obtain power network real-time running data；
    (2) real-time phase data are based on, analysis power network measures excitation system uncompensated frequency response characteristic online, multilevel iudge PSS needs to compensate phase difference, judges whether power network scale has larger change；
    (3) if power network scale will not vary widely in future, current PSS parameter is kept to run, conversely, then being calculated using SCE-UA Method is adjusted to the PSS4B parameters of important unit.
    (4) PSS4B phase compensation effect is verified.
  3. A kind of 3. PSS4B parameter regulation adaptive methods based on wide area measurement according to claim 2, it is characterised in that：
    In step (2), analyze real-time wide area measurement data and judge that power network scale changes, specifically include herein below：
    By wide area measurement technical limit spacing generator electromagnetic torque phase angle, the frequency response characteristic g of analysis integrated compensation (f)=φ, wherein f are system frequency, angles of the φ between electromagnetic torque increment and generator frequency difference Δ ω, And calculate centre frequency critical range fL±0.05Hz、fM±0.05Hz、fH± 0.05Hz synthesis phase angle andWherein, fL、fM、fHFor PSS4B phase compensations set it is low, The centre frequency of medium, high frequency.
    Phase values are calculated in real time and are contrasted with comprehensive compensation effect after current PSS4B parameter tunings, if both differences are more than A certain limitation, you can judge that power network scale is varied widely, current PSS4B parameters can not meet that the phase of excitation system is mended Requirement is repaid, it is necessary to be adjusted in good time, then goes to step (3)；If difference is little, continues detection and compare.
    Angle and angle values in the present invention use angle system, represent electromagnetic power in Δ ω-Δ δ planes with Δ ω axles Angle.On the occasion of the angle for representing advanced Δ ω axles, negative value represents the angle of lag Δ ω axles.
  4. 4. a kind of PSS4B multiplication factors regulation adaptive method based on status predication according to claim 4, its feature exist In：
    In step (3), PSS4B parameters are adjusted using SCE-UA algorithms, specifically include herein below：
    1) current PSS4B compensation phase angle is calculated, subtracting PSS4B by frequency response characteristic g (f)=φ of comprehensive compensation mends The uncompensated response characteristic that phase angle can obtain excitation system is repaid, electromagnetic torque increment and generator frequency difference Δ ω when uncompensated Between angle be φ0, the phase angle after comprehensive compensation is φ.PSS4B model parameters are set to meet WhereinFor PSS4B compensation phase angle, therefore the present invention uses compensation phase difference sum of the object function for each frequency rangeK represents number of samples in formula,Phase angle is compensated for the PSS4B of the fi sampled point,For The uncompensated phase angle of the fi sampled point.Constraints KD.PSS+KD0>The damped coefficient K that 0, i.e. PSS4B are providedD.PSSWith it is uncompensated When system damping COEFFICIENT KD0Sum is just.
    2) PSS4B parameters to be optimized are determined, it is as follows：KL1、KL2Low-band signal multiplication factor, KI1、KI2Intermediate frequency segment signal amplifies Multiple, KH1、KH2High band Regulate signal multiplication factor, TL5、TL6、TL11、TL12Low-frequency range phase shift link time constant, TI5、TI6、 TI11、TI12Mid Frequency phase shift link time constant, TH5、TH6、TH11、TH12High band phase shift link time constant, join for totally 18 Number.When needing to adjust PSS4B parameters because of system scale change, it can only optimize KL1、KI1、KH1、TL5、TL6、TI5、TI6、 TH5、TH6This 9 parameters.
    3) program initialization.The parameter of SCE-UA algorithms is set：System dimension n=9, the compound number w=3 to evolve is participated in, Each compound number of vertex d=2n+1, the compound number of vertex d of sonn=n+1, each compound generation offspring number δ=1, enters Change number λ=2n+1, sample point number m=w × d.
    4) m sample point is randomly generated, calculates the target function value f of each point, and it is ascending according to target function value Order is sorted, and the data group after sequence is designated as into M.
    5) divide compound colony, by the data group M of step 4) be divided into w it is compound, to each compound carry out CCE evolution Calculate, the random filial generation as caused by the superiority-inferiority screening parent individuality of target function value, ultimately form excellent after genetic evolution Change colony.
    6) the compound colony after evolution is mixed, re-starts the ascending sort of object function, data group M is formed, it is determined that being It is no to meet the condition of convergenceIf meeting the condition of convergence, terminate program, If being unsatisfactory for the condition of convergence, continue step 5).
CN201710985302.2A 2017-10-20 2017-10-20 A kind of PSS4B parameter regulation adaptive methods based on wide area measurement Pending CN107508295A (en)

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