CN110380432A - A kind of directly driven wind-powered field sub-synchronous oscillation suppression method and its system - Google Patents
A kind of directly driven wind-powered field sub-synchronous oscillation suppression method and its system Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H02J3/386—
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The present invention relates to a kind of directly driven wind-powered field sub-synchronous oscillation suppression method and its systems, belong to wind-force interconnection technology field, solve the problems, such as that the prior art fails to carry out cooperateing with optimization to cause its performance unstable to all fan parameters in wind power plant inside.This method comprises the following steps: the operation data of directly driven wind-powered field grid-connected system under acquisition grid disturbance；Sub-synchronous oscillation quantization criterion is obtained according to the response process for directly driving wind farm grid-connected system under grid disturbance and directly driven wind-powered play synchronized oscillation diverging mechanism, sub-synchronous oscillation quantization criterion is judged according to above-mentioned operation data, determines whether that sub-synchronous oscillation occurs；If it is determined that sub-synchronous oscillation occurs, then multiple target multiple constraint minimum value Optimized model is established, collaboration optimization is carried out to the phaselocked loop and current transformer PI parameter that directly drive in wind farm grid-connected system, to inhibit to the sub-synchronous oscillation.The method achieve carrying out collaboration optimization to all blowers of wind power plant, and then effectively inhibit sub-synchronous oscillation.
Description
Technical field
The present invention relates to wind-force interconnection technology field more particularly to a kind of directly driven wind-powered field sub-synchronous oscillation suppression method and
Its system.
Background technique
With the continuous expansion of wind power integration scale and density, sub-synchronous oscillation relevant to wind power plant is asked in electric system
Topic occurs more and more frequent, or even has seriously threatened the safe and stable operation of electric system, becomes restriction Wind Power Development
An important factor for.It is desirable to which finding a kind of effective braking measure solution wind power system is incorporated to stability caused by electric system
Problem.
Occur after sub-synchronous oscillation causes concern from texas,U.S double-fed fan motor field in 2009, domestic and foreign scholars propose
The braking measure of a variety of sub-synchronous oscillations can be divided into passive braking measure and active suppression measure from principle, wherein actively pressing down
Measure processed is further divided into optimal controller parameter, changes controller architecture and adds three kinds of device of inhibition.
However, above-mentioned braking measure is all to realize inhibition sub-synchronous oscillation by adjusting the control parameter of a Fans,
It is directed to separate unit Wind turbines and carries out parameter optimization, it is excellent to be not directed to all collaborations by wind power plant inner fan parameter
Change.But in actual motion, the sub-synchronous oscillation of generation is the collective effect by all blowers of wind power plant, only adjusts a blower
Parameter be it is inadequate, be easy to cause adjustment underswing or cause the phenomenon that attending to one thing and lose sight of another generation.
Summary of the invention
In view of above-mentioned analysis, the embodiment of the present invention be intended to provide a kind of directly driven wind-powered field sub-synchronous oscillation suppression method and
Its system fails to carry out cooperateing with optimization to cause its performance unstable to all fan parameters in wind power plant inside to solve the prior art
The problem of.
On the one hand, the embodiment of the invention provides a kind of directly driven wind-powered field sub-synchronous oscillation suppression methods, including walk as follows
It is rapid:
Acquire the operation data of directly driven wind-powered field grid-connected system under grid disturbance；
According to the response process and directly driven wind-powered play synchronized oscillation for directly driving wind farm grid-connected system under grid disturbance
Diverging mechanism obtains sub-synchronous oscillation quantization criterion, is sentenced according to above-mentioned operation data to sub-synchronous oscillation quantization criterion
It is disconnected, determine whether that sub-synchronous oscillation occurs；
If it is determined that sub-synchronous oscillation occurs, then multiple target multiple constraint minimum value Optimized model is established, to straight driving wind power plant
Phaselocked loop and current transformer PI parameter in grid-connected system carry out collaboration optimization, to inhibit to the sub-synchronous oscillation.
Above-mentioned technical proposal has the beneficial effect that: existing research all carries out parameter optimization for separate unit Wind turbines, not
It is related to all blowers inside wind power plant and carries out parameter collaboration optimization.But in actual motion, the sub-synchronous oscillation of generation be due to
By the collective effect of all blowers of wind power plant, only adjust a Fans parameter be it is inadequate, be easy to cause adjustment amplitude not
Foot causes the phenomenon that attending to one thing and lose sight of another generation.Therefore, the control parameter that the application is directed to all blowers in wind field is assisted
With optimization, it is not limited solely to a Fans.It is proved through a large number of experiments, above-mentioned technical proposal can be properly and efficiently to wind power plant
Internal all fan parameters carry out collaboration optimization, effectively inhibit directly driven wind-powered play synchronized oscillation.
The operation data of further improvement based on the above method, the directly driven wind-powered field grid-connected system includes: that blower goes out
Voltage phasor U at mouthful, useful work P at fan outlet, idle work Q at fan outlet, at fan outlet voltage phasor U phase angle δ；
The phaselocked loop and current transformer PI parameter include: phaselocked loop proportional gain factor Kp, integration gain factor Ki, net side
Current transformer current inner loop proportional gain factor Kp1, integration gain factor Ki1。
The beneficial effect of above-mentioned further improvement scheme is: having fully considered the phaselocked loop impacted to sub-synchronous oscillation
With grid-side converter inner loop control parameter (i.e. current transformer PI parameter), meanwhile, the pusher side on sub-synchronous oscillation without influence is omitted
Current transformer, grid-side converter outer loop control parameter, and then collaboration optimization operand is reduced on the whole, improve arithmetic speed.
It is proved through a large number of experiments, can effectively inhibit directly driven wind-powered field that sub-synchronous oscillation occurs.
Further, determine whether that sub-synchronous oscillation occurs, further comprise following steps:
According to the response process and directly driven wind-powered play synchronized oscillation for directly driving wind farm grid-connected system under grid disturbance
Mechanism is dissipated, the amplitude criterion and phase angle criterion that sub-synchronous oscillation occurs at fan outlet are obtained；
Harmonic Decomposition is carried out to voltage phasor U at fan outlet, obtains the amplitude u of fundamental frequency signal0, frequency f0, initial phase angleAnd the amplitude u of disturbance components, frequency fs, initial phase
According to the proportional gain factor k for directly driving phaselocked loop in wind farm grid-connected systempWith integration gain factor ki, in conjunction with
The f of above-mentioned acquisition0、fs、us, the amplitude A and initial phase of phase angle disturbance component are obtained by following formula
Wherein
M=ki-(ω0-ωs), N=kp-(ω0-ωs)
ω0=2 π f0, ωs=2 π fs
By the disturbance component amplitude A of acquisition, initial phaseIt brings the amplitude criterion into and phase angle criterion judges whether generation time
Synchronized oscillation；Wherein, any one of the amplitude criterion and phase angle criterion are set up, and are determined that sub-synchronous oscillation occurs, are not otherwise sent out
It is raw.
The beneficial effect of above-mentioned further improvement scheme is: having fully considered transient response of the phaselocked loop under grid disturbance
The proportional gain factor k of process and phaselocked looppWith integration gain factor kiInfluence for sub-synchronous oscillation, it is accurate to can get
Fan outlet at occur sub-synchronous oscillation amplitude and phase angle criterion.
Further, the amplitude criterion of generation sub-synchronous oscillation is at the fan outlet
Wherein
In formula, t is time, Kp1、Ki1Respectively grid-side converter current inner loop proportional gain factor and integral gain system
Number, L is line reactance；
The phase angle criterion of generation sub-synchronous oscillation is at the fan outlet
Wherein
The beneficial effect of above-mentioned further improvement scheme is: above-mentioned amplitude criterion and phase angle criterion are inventors by a large amount of
A set of effective criterion that Test Summary goes out, the criterion is simple and easy, can accurately and effectively judge whether to occur secondary same
Step oscillation.Also, the degree of stability of system can be further judged according to phase angle criterion, specifically, meets the γ of phase angle criterion
Smaller, system sub-synchronous oscillation is more serious, conversely, the γ for being unsatisfactory for phase angle criterion is bigger, system stability degree is higher.
Further, the multiple target multiple constraint minimum value Optimized model includes: wind power plant parameter optimization objective function and wind
Electric pulse field parameter optimizes constraint condition；Wherein,
The wind power plant parameter optimization objective function is
f(lect, K) and=min { w1,w2,…wn}
In formula, lectFor excitation parameters, K is operating parameter, { w1,w2,…wnEach element respectively represents wind-powered electricity generation in set
The dissipation energy of the corresponding blower in field；The excitation parameters include wind speed；The operating parameter includes voltage phasor at fan outlet
U, useful work P at fan outlet, idle work Q at fan outlet, at fan outlet voltage phasor U phase angle δ, fundamental frequency f0With
Disturbance component frequency fs；
The wind power plant parameter optimization constraint condition is
In formula, PiFor the useful work of the i-th Fans, PwfFor total useful work of wind field output；H is system variable, including wind
Useful work P at machine exit voltage phasor U, fan outlet, idle work Q at fan outlet, at fan outlet voltage phasor U phase
The frequency f of angle δ, fundamental frequency signal0, disturbance component frequency fs；hmin、hmaxFor system variable upper and lower limit；K is control to be adjusted
Variable, including phaselocked loop proportional gain factor Kp, integration gain factor Ki, grid-side converter current inner loop proportional gain factor
Kp1, integration gain factor Ki1；Kmin、KmaxTo control variable upper and lower limit.
The beneficial effect of above-mentioned further improvement scheme is: only carrying out to the parameter of a Fans in compared with the prior art
Optimization, above-mentioned technical proposal is cooperateed with to the control parameter (phaselocked loop and current transformer PI parameter) of blowers all in wind power plant
Optimization, the dissipation energy of the total dissipation energy and every Fans that make output all reaches minimum, so that system stability increases,
It can comparatively fast inhibit to vibrate, there is very strong practical application value.
Further, it is described the phaselocked loop directly driven in wind farm grid-connected system and current transformer PI parameter cooperate with it is excellent
Change, further comprise following steps:
Using control variable to be adjusted as set element, decision set is established；
Decision set initial value is obtained, judges whether to meet wind power plant parameter optimization constraint condition；If conditions are not met, by pre-
If rule changes decision set initial value, judge again, obtains all decision sets for meeting wind power plant parameter optimization constraint condition
Close numerical value；
Following broad object letter is established according to wind power plant parameter optimization objective function and wind power plant parameter optimization constraint condition
Number Li
Li=F (wi)+λ∑G
Wherein
λ=1-kn
∑ G=[max { 0, h-hmax}]2+[max{0,-h+hmin}]2+[max{0,K-Kmax}]2+
[max{0,-K+Kmin}]2+[max{0,rc+r}]2+[max{0,-r+rc}]2
In formula, λ is penalty factor, and k is degradation factor, and n is the number of iterations, a1For Lagrange multiplier；
All decision set numerical value for meeting wind power plant parameter optimization constraint condition are sequentially input into the broad object letter
In number, obtain so that the smallest decision set of the broad object function corresponds to numerical value, as phaselocked loop to be asked and current transformer PI
Parameter.
The beneficial effect of above-mentioned further improvement scheme is: introduced in broad object function penalty (punishment because
Part λ ∑ G where sub), it is reluctant for constraint condition in multi-objective optimization question to solve the problems, such as, it can be with fast convergence
Obtain accurate optimum results.Also, it can be realized by Programming without manpower intervention, intuitive, Yi Shi simple with method
The series of advantages such as now.
On the other hand, the embodiment of the invention provides a kind of directly driven wind-powered play synchronized oscillations to inhibit system, comprising:
Data acquisition module, for acquiring the operation data of directly driven wind-powered field grid-connected system under grid disturbance, by acquisition
Operation data is transmitted separately to damping analysis module and parameter optimization module；
Damping analysis module, for according to the response process for directly driving wind farm grid-connected system under grid disturbance and straight drive
Wind power plant sub-synchronous oscillation dissipates mechanism, show that sub-synchronous oscillation quantifies criterion, according to above-mentioned operation data to described subsynchronous
Oscillation quantization criterion is judged, determines whether that sub-synchronous oscillation occurs, and will determine that result is transmitted to parameter optimization module；
Parameter optimization module, it is excellent for establishing multiple target multiple constraint minimum value when determining result for sub-synchronous oscillation occurs
Change model to assist the phaselocked loop and current transformer PI parameter that directly drive in wind farm grid-connected system in conjunction with the operation data
With optimization.
The beneficial effect of above-mentioned technical proposal is: in directly driven wind-powered field grid-connected system operation, the sub-synchronous oscillation of generation is
Due to the collective effect by blowers all inside wind power plant, the parameter that a Fans are only adjusted by the prior art is that can not have
Effect inhibits sub-synchronous oscillation, be easy to cause adjustment underswing or causes the phenomenon that attending to one thing and lose sight of another generation.Therefore, above-mentioned technology
Scheme carries out collaboration optimization for the control parameter of all blowers in wind field, is not limited solely to a Fans, demonstrate,proves through a large number of experiments
It is bright, the sub-synchronous oscillation ill effect generated after directly driven wind-powered field access power grid can be effectively inhibited.
Further improvement based on above system, the damping analysis module further comprises:
Harmonic Decomposition module obtains the frequency of fundamental frequency signal for carrying out Harmonic Decomposition to voltage phasor U at fan outlet
f0And the amplitude u of disturbance components, frequency fs, initial phaseThe result of acquisition is transmitted to disturbance component analysis module；
Disturbance component analysis module, for according to the proportional gain factor k for directly driving phaselocked loop in wind farm grid-connected systemp
With integration gain factor ki, in conjunction with the f of above-mentioned acquisition0、fs、us, the amplitude A of phase angle disturbance component is obtained by following formula
And initial phaseBy the A andIt is transmitted to sub-synchronous oscillation judgment module
Wherein
M=ki-(ω0-ωs), N=kp-(ω0-ωs)
ω0=2 π f0, ωs=2 π fs
Sub-synchronous oscillation judgment module, for according to directly driven under grid disturbance the response process of wind farm grid-connected system with
And directly driven wind-powered play synchronized oscillation dissipates mechanism, obtains the amplitude criterion of generation sub-synchronous oscillation and phase angle at fan outlet and sentences
According to by the disturbance component amplitude A of acquisition, initial phaseBring the amplitude criterion into and phase angle criterion judge whether to occur it is subsynchronous
Oscillation；Wherein, any one of the amplitude criterion and phase angle criterion are set up, and are determined that sub-synchronous oscillation occurs, are not otherwise occurred.
The beneficial effect of above-mentioned further improvement scheme is: having fully considered transient response of the phaselocked loop under grid disturbance
The proportional gain factor k of process and phaselocked looppWith integration gain factor kiInfluence for sub-synchronous oscillation, it is accurate to can get
Fan outlet at occur sub-synchronous oscillation amplitude and phase angle criterion.
Further, the sub-synchronous oscillation judgment module further comprises:
Amplitude judging submodule, for obtaining the amplitude criterion that sub-synchronous oscillation occurs at fan outlet by following formula
Wherein
In formula, t is time, Kp1、Ki1Respectively grid-side converter current inner loop proportional gain factor and integral gain system
Number, L is line reactance,
The amplitude criterion, for according to the disturbance component amplitude A of acquisition, initial phaseJudge current amplitude | u | whether
Meet amplitude requirement, the judging result one of acquisition is sent to comprehensive descision submodule；
Phase judging submodule, for according to the phase angle for obtaining generation sub-synchronous oscillation at fan outlet by following formula
Criterion
Wherein
The phase angle criterion, for according to the disturbance component amplitude A of acquisition, initial phaseWhether judge current phase angle γ
Meet phase angle requirement, the judging result two of acquisition is sent to comprehensive descision submodule；
Comprehensive descision submodule, for whether sub-synchronous oscillation occurring according to above-mentioned judging result one, judging result two；When
Any of the amplitude criterion and phase angle criterion are set up, and are determined that sub-synchronous oscillation occurs, are performed the next step, and otherwise, are terminated.
The beneficial effect of above-mentioned further improvement scheme is: above-mentioned amplitude criterion and phase angle criterion are inventors by a large amount of
A set of effective criterion that Test Summary goes out, the criterion is simple and easy, can accurately and effectively judge whether to occur secondary same
Step oscillation.Also, the degree of stability of system can be further judged according to phase angle criterion, specifically, meets the γ of phase angle criterion
Smaller, system sub-synchronous oscillation is more serious, conversely, the γ for being unsatisfactory for phase angle criterion is bigger, system stability degree is higher.
Further, the parameter optimization module further comprises:
Decision set generation module, for establishing decision set as set element using control variable to be adjusted, then root
According to received operation data, decision set initial value is obtained, preliminary screening module is transmitted it to；
Preliminary screening module judges whether to meet multiple target multiple constraint minimum value excellent for obtaining decision set initial value
Change the wind power plant parameter optimization constraint condition of model；If conditions are not met, changing decision set initial value by preset rules, sentence again
It is disconnected, all decision set numerical value for meeting wind power plant parameter optimization constraint condition are obtained, transmits it to and obtains optimized parameter mould
Block；
Optimized parameter module, for being built according to wind power plant parameter optimization objective function and wind power plant parameter optimization constraint condition
Broad object function L under Lirui
Li=F (wi)+λ∑G
Wherein
λ=1-kn
∑ G=[max { 0, h-hmax}]2+[max{0,-h+hmin}]2+[max{0,K-Kmax}]2+
[max{0,-K+Kmin}]2+[max{0,rc+r}]2+[max{0,-r+rc}]2
In formula, λ is penalty factor, and k is degradation factor, and n is the number of iterations, a1For Lagrange multiplier, wind-powered electricity generation will be met
All decision set numerical value of field parameters optimization constraint condition are sequentially input in the broad object function, are obtained so that described wide
The adopted the smallest decision set of objective function corresponds to numerical value, as phaselocked loop to be asked and current transformer PI parameter.
The beneficial effect of above-mentioned further improvement scheme is: introduced in broad object function penalty (punishment because
Part λ ∑ G where sub), it is reluctant for constraint condition in multi-objective optimization question to solve the problems, such as, it can be with fast convergence
Obtain accurate optimum results.Also, it can be realized by Programming without manpower intervention, intuitive, Yi Shi simple with method
The series of advantages such as now.
It in the present invention, can also be combined with each other between above-mentioned each technical solution, to realize more preferred assembled schemes.This
Other feature and advantage of invention will illustrate in the following description, also, certain advantages can become from specification it is aobvious and
It is clear to, or understand through the implementation of the invention.The objectives and other advantages of the invention can pass through institute in specification and attached drawing
It is achieved and obtained in the content particularly pointed out.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is directly driven wind-powered field grid-connected system structural schematic diagram；
Fig. 2 is the step schematic diagram of 1 directly driven wind-powered sub-synchronous oscillation suppression method of the embodiment of the present invention；
Fig. 3 is that the directly driven wind-powered play synchronized oscillation of the embodiment of the present invention 3 inhibits system composition schematic diagram；
Fig. 4 is 4 damping analysis module composition schematic diagram of the embodiment of the present invention；
Fig. 5 is 4 parameter optimization module composition schematic diagram of the embodiment of the present invention.
Appended drawing reference:
PMSG- generator；RSC- generator-side converter wear；GSC- grid-side converter；L1, L2, LgInductance；ugInfinite bus system
(power supply unit)；PLL- phaselocked loop, MSC- pusher side controller；NSC- net side controller；WM- wind turbine.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention, it is not intended to limit the scope of the present invention.
By taking directly driven wind-powered field grid-connected system as shown in Figure 1 as an example comprising the identical blower fan control system of two sets of compositions.
Every set blower fan control system includes wind turbine WM, generator PMSG, generator-side converter wear RSC, net survey current transformer GSC, inductance L, lock
Phase ring PLL, pusher side controller MSC, net side controller NSC.
Directly driven wind-powered play synchronized oscillation dissipates mechanism: under directly driven wind-powered machine WM access grid conditions, blower in wind power plant
Operation control passes through wind farm grid-connected point (inductance L between blower1Right side) voltage dynamic intercouple and influence, disturbed in power grid
Under dynamic, the response component that disturbance component is generated in phaselocked loop and grid-side converter, the response component is overlapped mutually with original disturbance,
And net side controller is gone successively to as disturbance by the feedback channel in phase lock control, the response that final all blowers generate
Component is superimposed with original disturbance jointly.
The effect of generator-side converter wear: the AC rectification that generator is issued is at direct current.
The effect of grid-side converter: the effect of grid-side converter is to inverte direct current to alternating current.
The effect of phaselocked loop: to make directly driven wind-powered unit output voltage and network voltage moment keep same-phase, blower is logical
Position and its rotation angle frequency for crossing the grid voltage phase-angle acquisition of information axis of phaselocked loop offer, are used for coordinate transform.
Phaselocked loop is using voltage on line side as input variable, and under the effect of voltage on line side disturbance component, phaselocked loop cannot be complete
Grid phase information is tracked, a disturbance component Δ θ can be generated in output phase parallactic anglePLL
In formula, each variable meaning is as described in embodiment 2.
Embodiment 1
A specific embodiment of the invention discloses a kind of directly driven wind-powered field sub-synchronous oscillation suppression method, such as Fig. 1 institute
Show, includes the following steps:
S1. the operation data of directly driven wind-powered field grid-connected system under grid disturbance is acquired；
S2. according to the response process for directly driving wind farm grid-connected system under grid disturbance and the synchronous vibration of directly driven wind-powered play
It swings diverging mechanism and obtains sub-synchronous oscillation quantization criterion, sub-synchronous oscillation quantization criterion is carried out according to above-mentioned operation data
Judgement, determines whether that sub-synchronous oscillation occurs；
S3. if it is determined that sub-synchronous oscillation occurs, then multiple target multiple constraint minimum value Optimized model is established, to straight driving wind-powered electricity generation
Phaselocked loop and current transformer PI parameter in the grid-connected system of field carry out collaboration optimization, to inhibit to the sub-synchronous oscillation.
Compared with prior art, the control parameter that method provided in this embodiment is directed to all blowers in wind field carries out
Collaboration optimization, and then the sub-synchronous oscillation ill effect generated after directly driven wind-powered field access power grid can be effectively inhibited.It is existing
Research all carries out parameter optimization for separate unit Wind turbines, and it is excellent to be not directed to all blowers progress parameter collaborations inside wind power plant
Change.But in actual motion, the sub-synchronous oscillation of generation is only to adjust one due to the collective effect by all blowers of wind power plant
The parameter of blower be it is inadequate, be easy to cause adjustment underswing or cause the phenomenon that attending to one thing and lose sight of another generation.It is demonstrate,proved through a large number of experiments
Bright, method provided in this embodiment properly and efficiently can carry out collaboration optimization to all fan parameters in wind power plant inside, have
Effect inhibits directly driven wind-powered field that sub-synchronous oscillation occurs.
Embodiment 2
It optimizes on the basis of embodiment 1, the operation data of directly driven wind-powered field grid-connected system includes: at fan outlet
Useful work P at voltage phasor U, fan outlet, idle work Q at fan outlet, at fan outlet voltage phasor U phase angle δ.
Phaselocked loop and current transformer PI parameter include: phaselocked loop proportional gain factor Kp, integration gain factor Ki, net side unsteady flow
Device current inner loop proportional gain factor Kp1, integration gain factor Ki1。
Preferably, described to determine whether that sub-synchronous oscillation occurs in step S2, further comprise following steps:
S21. synchronous according to the response process for directly driving wind farm grid-connected system under grid disturbance and directly driven wind-powered play
Oscillation and divergence mechanism obtains the amplitude criterion and phase angle criterion that sub-synchronous oscillation occurs at fan outlet.
S22. Harmonic Decomposition is carried out to voltage phasor U at fan outlet, obtains the frequency f of fundamental frequency signal0, and disturbance point
The amplitude u of amounts, frequency fs, initial phase
Illustratively, U can be obtained through the decomposition of frequency analysis prony algorithm
It can get the amplitude u of fundamental frequency signal0Frequency f0, initial phaseAnd the amplitude u of disturbance components, frequency fs, first phase
Position
S23. according to the proportional gain factor k for directly driving phaselocked loop in wind farm grid-connected systempWith integration gain factor ki,
In conjunction with the f of above-mentioned acquisition0、fs、us, phase angle disturbance component Δ θ is obtained by following formulaPLLAmplitude A and initial phase
Wherein
M=ki-(ω0-ωs), N=kp-(ω0-ωs)
ω0=2 π f0, ωs=2 π fs
S24. by the disturbance component amplitude A of acquisition, initial phaseIt brings the amplitude criterion into and phase angle criterion judges whether to send out
Raw sub-synchronous oscillation；Wherein, any one of the amplitude criterion and phase angle criterion are set up, and determine that sub-synchronous oscillation occurs, otherwise
Do not occur.
Preferably, in step S23, the amplitude criterion that sub-synchronous oscillation occurs at the fan outlet is
Wherein
In formula, t is time, Kp1、Ki1Respectively grid-side converter current inner loop proportional gain factor and integral gain system
Number, L is line reactance.
The phase angle criterion of generation sub-synchronous oscillation is at the fan outlet
Wherein
Above-mentioned γ can also judge the degree of stability of system, and specifically, the γ for meeting phase angle criterion is smaller, and system is subsynchronous
Oscillation is more serious, conversely, the γ for being unsatisfactory for phase angle criterion is bigger, system stability degree is higher.
Preferably, the multiple target multiple constraint minimum value Optimized model includes: wind power plant parameter optimization objective function and wind
Electric pulse field parameter optimizes constraint condition.
Wind power plant parameter optimization objective function is
f(lect, K) and=min { w1,w2,…wn}
In formula, lectFor excitation parameters, K is operating parameter, { w1,w2,…wnEach element respectively represents wind-powered electricity generation in set
The dissipation energy of the corresponding blower in field；The excitation parameters include wind speed；The operating parameter includes voltage phasor at fan outlet
U, useful work P at fan outlet, idle work Q at fan outlet, at fan outlet voltage phasor U phase angle δ, fundamental frequency f0With
Disturbance component frequency fs。
Wind power plant parameter optimization constraint condition is
In formula, PiFor the useful work of the i-th Fans, PwfFor total useful work of wind field output；H is system variable, including wind
Useful work P at machine exit voltage phasor U, fan outlet, idle work Q at fan outlet, at fan outlet voltage phasor U phase
The frequency f of angle δ, fundamental frequency signal0, disturbance component frequency fs；hmin、hmaxFor system variable upper and lower limit；K is control to be adjusted
Variable, Kmin、KmaxTo control variable upper and lower limit, the control variable includes phaselocked loop proportional gain factor Kp, integral gain system
Number Ki, grid-side converter current inner loop proportional gain factor Kp1, integration gain factor Ki1。
Specifically, dissipation energy wiIt can further be calculate by the following formula
Wherein
In formula, ωwAnd ωgThe respectively angular speed of wind energy conversion system and generator, Dg、DωRespectively wind energy conversion system and generator
Self-damping coefficient, DsMutual damping coefficient between blower and generator,Respectively indicate blower fan control system 1 and blower
The initial phase of control system 2.
Preferably, the phaselocked loop and current transformer PI parameter directly driven in wind farm grid-connected system is carried out described in step S3
Collaboration optimization, further comprises following steps:
S31. using control variable to be adjusted as set element, decision set is established；
S32. decision set initial value is obtained, judges whether to meet wind power plant parameter optimization constraint condition；If conditions are not met,
Change decision set initial value by preset rules, judge again, acquisition meets all of wind power plant parameter optimization constraint condition and determines
Plan set numerical value；
S33. following broad sense mesh is established according to wind power plant parameter optimization objective function and wind power plant parameter optimization constraint condition
Scalar functions Li
Li=F (wi)+λ∑G
Wherein
λ=1-kn
∑ G=[max { 0, h-hmax}]2+[max{0,-h+hmin}]2+[max{0,K-Kmax}]2+
[max{0,-K+Kmin}]2+[max{0,rc+r}]2+[max{0,-r+rc}]2
In formula, λ is penalty factor, and k is degradation factor, and n is the number of iterations, a1For Lagrange multiplier.
S34. all decision set numerical value for meeting wind power plant parameter optimization constraint condition are sequentially input into the broad sense mesh
In scalar functions, obtain so that the smallest decision set of the broad object function corresponds to numerical value, as phaselocked loop to be asked and unsteady flow
Device PI parameter.
Compared with Example 1, method provided in this embodiment has fully considered that transient state of the phaselocked loop under grid disturbance is rung
Answer the proportional gain factor k of process and phaselocked looppWith integration gain factor kiInfluence for sub-synchronous oscillation can get standard
The amplitude and phase angle criterion of sub-synchronous oscillation occur at true fan outlet.The parameter of a Fans in compared with the prior art
Optimization, the above method carry out collaboration optimization based on the control parameter of blowers all in wind power plant, and punishment is introduced in objective function
Function, it is reluctant for constraint condition in multi-objective optimization question to solve the problems, such as, make the consumption of the every Fans output of wind field
Dissipate energy and total dissipation energy and all reach minimum, so can effectively inhibit generate after directly driven wind-powered field access power grid it is time same
Step oscillation ill effect.
Embodiment 3
The present invention also provides a kind of directly driven wind-powered play synchronized oscillations using 1 the method for embodiment to inhibit system,
As shown in figure 3, the system includes data acquisition module, damping analysis module, parameter optimization module.Wherein, data acquisition module
Output end connect respectively with damping analysis module input, parameter optimization module input one, damping analysis module output end
It is connect with parameter optimization module input two.
Data acquisition module, for acquiring the operation data of directly driven wind-powered field grid-connected system under grid disturbance, by acquisition
Operation data is transmitted separately to damping analysis module and parameter optimization module.
Damping analysis module, for according to the response process for directly driving wind farm grid-connected system under grid disturbance and straight drive
Wind power plant sub-synchronous oscillation dissipates mechanism, show that sub-synchronous oscillation quantifies criterion, according to above-mentioned operation data to described subsynchronous
Oscillation quantization criterion is judged, determines whether that sub-synchronous oscillation occurs, and will determine that result is transmitted to parameter optimization module.
Parameter optimization module, for establishing multiple target multiple constraint minimum value when determining result for sub-synchronous oscillation occurs
Optimized model carries out the phaselocked loop and current transformer PI parameter directly driven in wind farm grid-connected system in conjunction with the operation data
Collaboration optimization.
Compared with prior art, system provided in this embodiment is assisted for the control parameters of all blowers in wind field
With optimization, it is not limited solely to a Fans.In the operation of directly driven wind-powered field grid-connected system, the sub-synchronous oscillation of generation be due to by
The collective effect of all blowers inside wind power plant, the parameter that a Fans are only adjusted by the prior art are can not effectively to inhibit secondary
Synchronized oscillation, it be easy to cause adjustment underswing or causes the phenomenon that attending to one thing and lose sight of another generation.It is proved through a large number of experiments, this implementation
The system that example provides can effectively inhibit the sub-synchronous oscillation ill effect generated after directly driven wind-powered field access power grid.
Embodiment 4
It is optimized on the basis of embodiment 3, as shown in figure 4, damping analysis module further comprises sequentially connected
Harmonic Decomposition module, disturbance component analysis module and sub-synchronous oscillation judgment module.
Harmonic Decomposition module obtains the frequency of fundamental frequency signal for carrying out Harmonic Decomposition to voltage phasor U at fan outlet
f0And the amplitude u of disturbance components, frequency fs, initial phaseThe result of acquisition is transmitted to disturbance component analysis module.
Disturbance component analysis module, for according to the proportional gain factor k for directly driving phaselocked loop in wind farm grid-connected systemp
With integration gain factor ki, in conjunction with the f of above-mentioned acquisition0、fs、us, the amplitude A of phase angle disturbance component is obtained by following formula
And initial phaseBy the A andIt is transmitted to sub-synchronous oscillation judgment module
Wherein
M=ki-(ω0-ωs), N=kp-(ω0-ωs)
ω0=2 π f0, ωs=2 π fs
Sub-synchronous oscillation judgment module, for according to directly driven under grid disturbance the response process of wind farm grid-connected system with
And directly driven wind-powered play synchronized oscillation dissipates mechanism, obtains the amplitude criterion of generation sub-synchronous oscillation and phase angle at fan outlet and sentences
According to by the disturbance component amplitude A of acquisition, initial phaseBring the amplitude criterion into and phase angle criterion judge whether to occur it is subsynchronous
Oscillation；Wherein, any one of the amplitude criterion and phase angle criterion are set up, and are determined that sub-synchronous oscillation occurs, are not otherwise occurred.
Preferably, above-mentioned sub-synchronous oscillation judgment module further comprise amplitude judging submodule, phase judging submodule,
Comprehensive descision submodule.
Amplitude judging submodule, for according to the disturbance component amplitude A of acquisition, initial phaseWind is obtained by following formula
The amplitude criterion of sub-synchronous oscillation occurs for machine exit, and then judges current amplitude according to the amplitude criterion | u | whether meet
Amplitude requirement, is sent to comprehensive descision submodule for the judging result one of acquisition.The amplitude criterion is
Wherein
In formula, t is time, Kp1、Ki1Respectively grid-side converter current inner loop proportional gain factor and integral gain system
Number, L is line reactance.
Phase judging submodule, for according to the disturbance component amplitude A of acquisition, initial phaseIt is obtained by following formula
The phase angle criterion of sub-synchronous oscillation occurs at fan outlet, and then judges whether current phase angle γ meets according to the phase angle criterion
Phase angle requirement, is sent to comprehensive descision submodule for the judging result two of acquisition.The phase angle criterion is
Wherein
Comprehensive descision submodule, for whether sub-synchronous oscillation occurring according to above-mentioned judging result one, judging result two；When
Any of the amplitude criterion and phase angle criterion are set up, and are determined that sub-synchronous oscillation occurs, are performed the next step and (joined
Number optimization, the work of parameter optimization module), otherwise, terminates and (need not carry out parameter optimization, parameter optimization module does not work).
Preferably, as shown in figure 5, parameter optimization module further comprise sequentially connected decision set generation module, just
Walk screening module, optimized parameter module.
Decision set generation module, for establishing decision set as set element using control variable to be adjusted, then root
According to received operation data, decision set initial value is obtained, preliminary screening module is transmitted it to.
Preliminary screening module judges whether to meet multiple target multiple constraint minimum value excellent for obtaining decision set initial value
Change the wind power plant parameter optimization constraint condition of model；If conditions are not met, changing decision set initial value by preset rules, sentence again
It is disconnected, all decision set numerical value for meeting wind power plant parameter optimization constraint condition are obtained, transmits it to and obtains optimized parameter mould
Block.
Optimized parameter module, for being built according to wind power plant parameter optimization objective function and wind power plant parameter optimization constraint condition
Broad object function L under Lirui, all decision set numerical value for meeting wind power plant parameter optimization constraint condition are sequentially input into institute
It states in broad object function, obtains so that the smallest decision set of the broad object function corresponds to numerical value, as locking phase to be asked
Ring and current transformer PI parameter.Broad object function LiIt can be calculated by following formula
Li=F (wi)+λ∑G
Wherein
λ=1-kn
∑ G=[max { 0, h-hmax}]2+[max{0,-h+hmin}]2+[max{0,K-Kmax}]2+
[max{0,-K+Kmin}]2+[max{0,rc+r}]2+[max{0,-r+rc}]2
In formula, λ is penalty factor, and k is degradation factor, and n is the number of iterations, a1For Lagrange multiplier.
Compared with 3 system of embodiment, system provided in this embodiment has fully considered that phaselocked loop is temporary under grid disturbance
The proportional gain factor k of state response process and phaselocked looppWith integration gain factor kiInfluence for sub-synchronous oscillation can obtain
Obtain the amplitude and phase angle criterion that sub-synchronous oscillation occurs at accurate fan outlet.Fans in compared with the prior art
Parameter optimization, the above method carry out collaboration optimization based on the control parameter of blowers all in wind power plant, introduce in objective function
Penalty, it is reluctant for constraint condition in multi-objective optimization question to solve the problems, such as, make the every Fans output of wind field
Dissipation energy and total dissipation energy all reach minimum, and then can effectively inhibit and generate after directly driven wind-powered field access power grid
Sub-synchronous oscillation ill effect.
It will be understood by those skilled in the art that realizing all or part of the process of above-described embodiment method, meter can be passed through
Calculation machine program is completed to instruct relevant hardware, and the program can be stored in computer readable storage medium.Wherein, institute
Stating computer readable storage medium is disk, CD, read-only memory or random access memory etc..
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of directly driven wind-powered field sub-synchronous oscillation suppression method, which comprises the steps of:
Acquire the operation data of directly driven wind-powered field grid-connected system under grid disturbance；
It is dissipated according to the response process for directly driving wind farm grid-connected system under grid disturbance and directly driven wind-powered play synchronized oscillation
Mechanism obtains sub-synchronous oscillation quantization criterion, is judged according to above-mentioned operation data sub-synchronous oscillation quantization criterion,
Determine whether that sub-synchronous oscillation occurs；
If it is determined that sub-synchronous oscillation occurs, then multiple target multiple constraint minimum value Optimized model is established, it is wind farm grid-connected to directly driving
Phaselocked loop and current transformer PI parameter in system carry out collaboration optimization, to inhibit to the sub-synchronous oscillation.
2. directly driven wind-powered field sub-synchronous oscillation suppression method according to claim 1, which is characterized in that described directly driven wind-powered
The operation data of grid-connected system includes: voltage phasor U at fan outlet, useful work P at fan outlet, useless at fan outlet
The phase angle δ of voltage phasor U at function Q, fan outlet；
The phaselocked loop and current transformer PI parameter include: phaselocked loop proportional gain factor Kp, integration gain factor Ki, net side unsteady flow
Device current inner loop proportional gain factor Kp1, integration gain factor Ki1。
3. directly driven wind-powered field sub-synchronous oscillation suppression method according to claim 2, which is characterized in that described to determine whether
Sub-synchronous oscillation occurs, includes the following steps:
It is dissipated according to the response process for directly driving wind farm grid-connected system under grid disturbance and directly driven wind-powered play synchronized oscillation
Mechanism obtains the amplitude criterion and phase angle criterion that sub-synchronous oscillation occurs at fan outlet；
Harmonic Decomposition is carried out to voltage phasor U at fan outlet, obtains the frequency f of fundamental frequency signal0And the amplitude of disturbance component
us, frequency fs, initial phase
According to the proportional gain factor k of phaselocked loop in directly driven wind-powered field grid-connected systempWith integration gain factor ki, obtained in conjunction with above-mentioned
The f obtained0、fs、us, the amplitude A and initial phase of phase angle disturbance component are obtained by following formula
Wherein
M=ki-(ω0-ωs), N=kp-(ω0-ωs)
ω0=2 π f0, ωs=2 π fs
By the disturbance component amplitude A of acquisition, initial phaseBring the amplitude criterion into and phase angle criterion judge whether to occur it is subsynchronous
Oscillation, wherein any one of the amplitude criterion and phase angle criterion are set up, and are determined that sub-synchronous oscillation occurs, are not otherwise occurred.
4. directly driven wind-powered field sub-synchronous oscillation suppression method according to claim 3, which is characterized in that the fan outlet
Place occur sub-synchronous oscillation amplitude criterion be
Wherein
In formula, t is time, Kp1、Ki1Respectively grid-side converter current inner loop proportional gain factor and integration gain factor, L are
Line reactance；
The phase angle criterion of generation sub-synchronous oscillation is at the fan outlet
Wherein
5. directly driven wind-powered field sub-synchronous oscillation suppression method described in one of -4 according to claim 1, which is characterized in that described more
Target multiple constraint minimum value Optimized model includes: wind power plant parameter optimization objective function and wind power plant parameter optimization constraint condition；
Wherein,
The wind power plant parameter optimization objective function is
f(lect, K) and=min { w1,w2,…wn}
In formula, lectFor excitation parameters, K is operating parameter, { w1,w2,…wnEach element respectively represents wind power plant pair in set
Answer the dissipation energy of blower；The excitation parameters include wind speed；The operating parameter includes voltage phasor U, wind at fan outlet
Idle work Q at machine exit useful work P, fan outlet, at fan outlet voltage phasor U phase angle δ, fundamental frequency f0And disturbance
Component frequencies fs；
The wind power plant parameter optimization constraint condition is
In formula, PiFor the useful work of the i-th Fans, PwfFor total useful work of wind field output；H is system variable, including blower goes out
Voltage phasor U at mouthful, useful work P at fan outlet, idle work Q at fan outlet, the phase angle δ of voltage phasor U at fan outlet,
The frequency f of fundamental frequency signal0, disturbance component frequency fs；hmin、hmaxFor system variable upper and lower limit；K is that control to be adjusted becomes
Amount, including phaselocked loop proportional gain factor Kp, integration gain factor Ki, grid-side converter current inner loop proportional gain factor Kp1、
Integration gain factor Ki1, Kmin、KmaxTo control variable upper and lower limit.
6. directly driven wind-powered field sub-synchronous oscillation suppression method according to claim 5, which is characterized in that described to straight driving
It further comprises following steps that phaselocked loop and current transformer PI parameter in wind farm grid-connected system, which carry out collaboration optimization:
Using control variable to be adjusted as set element, decision set is established；
Decision set initial value is obtained, judges whether to meet wind power plant parameter optimization constraint condition；If conditions are not met, by default rule
Then change decision set initial value, judge again, obtains all decision set numbers for meeting wind power plant parameter optimization constraint condition
Value；
Following broad object function L is established according to wind power plant parameter optimization objective function and wind power plant parameter optimization constraint conditioni
Li=F (wi)+λ∑G
Wherein
λ=1-kn
∑ G=[max { 0, h-hmax}]2+[max{0,-h+hmin}]2+[max{0,K-Kmax}]2+[max{0,-K+Kmin}]2+[max
{0,rc+r}]2+[max{0,-r+rc}]2
In formula, λ is penalty factor, and k is degradation factor, and n is the number of iterations, a1For Lagrange multiplier；
All decision set numerical value for meeting wind power plant parameter optimization constraint condition are sequentially input in the broad object function,
It obtains so that the smallest decision set of the broad object function corresponds to numerical value, as phaselocked loop to be asked and current transformer PI parameter.
7. a kind of directly driven wind-powered play synchronized oscillation inhibits system characterized by comprising
Data acquisition module, for acquiring the operation data of directly driven wind-powered field grid-connected system under grid disturbance, by the operation of acquisition
Data are transmitted separately to damping analysis module and parameter optimization module；
Damping analysis module, for according to the response process that directly drives wind farm grid-connected system under grid disturbance and directly driven wind-powered
Play synchronized oscillation dissipates mechanism, show that sub-synchronous oscillation quantifies criterion, according to above-mentioned operation data to the sub-synchronous oscillation
Quantization criterion is judged, determines whether that sub-synchronous oscillation occurs, and will determine that result is transmitted to parameter optimization module；
Parameter optimization module optimizes mould for establishing multiple target multiple constraint minimum value when determining result for sub-synchronous oscillation occurs
Type cooperate with to the phaselocked loop and current transformer PI parameter that directly drive in wind farm grid-connected system excellent in conjunction with the operation data
Change.
8. directly driven wind-powered play synchronized oscillation according to claim 7 inhibits system, which is characterized in that the damping analysis
Module further comprises:
Harmonic Decomposition module obtains the frequency f of fundamental frequency signal for carrying out Harmonic Decomposition to voltage phasor U at fan outlet0, with
And the amplitude u of disturbance components, frequency fs, initial phaseThe result of acquisition is transmitted to disturbance component analysis module；
Disturbance component analysis module, for according to the proportional gain factor k for directly driving phaselocked loop in wind farm grid-connected systempAnd product
Divide gain coefficient ki, in conjunction with the f of above-mentioned acquisition0、fs、us, by following formula obtain phase angle disturbance component amplitude A and just
PhaseBy the A andIt is transmitted to sub-synchronous oscillation judgment module
Wherein
M=ki-(ω0-ωs), N=kp-(ω0-ωs)
ω0=2 π f0, ωs=2 π fs
Sub-synchronous oscillation judgment module, for according to the response process for directly driving wind farm grid-connected system under grid disturbance and directly
Wind dispelling electric field sub-synchronous oscillation dissipates mechanism, obtains the amplitude criterion and phase angle criterion that sub-synchronous oscillation occurs at fan outlet,
By the disturbance component amplitude A of acquisition, initial phaseIt brings the amplitude criterion into and phase angle criterion judges whether that subsynchronous vibration occurs
It swings；Wherein, any one of the amplitude criterion and phase angle criterion are set up, and are determined that sub-synchronous oscillation occurs, are not otherwise occurred.
9. directly driven wind-powered play synchronized oscillation according to claim 8 inhibits system, which is characterized in that the subsynchronous vibration
Swinging judgment module further comprises:
Amplitude judging submodule, for obtaining the amplitude criterion that sub-synchronous oscillation occurs at fan outlet by following formula
Wherein
In formula, t is time, Kp1、Ki1Respectively grid-side converter current inner loop proportional gain factor and integration gain factor, L are
Line reactance,
The amplitude criterion, for according to the disturbance component amplitude A of acquisition, initial phaseJudge current amplitude | u | whether meet
The judging result one of acquisition is sent to comprehensive descision submodule by amplitude criterion；
Phase judging submodule, for obtaining the phase angle criterion that sub-synchronous oscillation occurs at fan outlet by following formula
Wherein
The phase angle criterion, for according to the disturbance component amplitude A of acquisition, initial phaseJudge whether current phase angle γ meets phase
The judging result two of acquisition is sent to comprehensive descision submodule by angle criterion；
Comprehensive descision submodule, for whether sub-synchronous oscillation occurring according to above-mentioned judging result one, judging result two；When described
Any of amplitude criterion and phase angle criterion are set up, and are determined that sub-synchronous oscillation occurs, are performed the next step, and otherwise, are terminated.
10. directly driven wind-powered play synchronized oscillation according to claim 9 inhibits system, which is characterized in that the parameter is excellent
Changing module further comprises:
Decision set generation module, for establishing decision set as set element using control variable to be adjusted, then basis is connect
The operation data of receipts obtains decision set initial value, transmits it to preliminary screening module；
Preliminary screening module judges whether to meet multiple target multiple constraint minimum value optimization mould for obtaining decision set initial value
The wind power plant parameter optimization constraint condition of type；If conditions are not met, changing decision set initial value by preset rules, judge again,
All decision set numerical value for meeting wind power plant parameter optimization constraint condition are obtained, transmits it to and obtains optimized parameter module；
Optimized parameter module, for being established such as according to wind power plant parameter optimization objective function and wind power plant parameter optimization constraint condition
Lower broad object function Li
Li=F (wi)+λ∑G
Wherein
λ=1-kn
∑ G=[max { 0, h-hmax}]2+[max{0,-h+hmin}]2+[max{0,K-Kmax}]2+[max{0,-K+Kmin}]2+[max
{0,rc+r}]2+[max{0,-r+rc}]2
In formula, λ is penalty factor, and k is degradation factor, and n is the number of iterations, a1For Lagrange multiplier, wind-powered electricity generation field parameters will be met
All decision set numerical value of optimization constraint condition are sequentially input in the broad object function, are obtained so that the broad object
The smallest decision set of function corresponds to numerical value, as phaselocked loop to be asked and current transformer PI parameter.
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