CN106356874A - Synchronous oscillation inhibiting method of wind turbine generator and inhibiting system - Google Patents
Synchronous oscillation inhibiting method of wind turbine generator and inhibiting system Download PDFInfo
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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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Abstract
The invention discloses a synchronous oscillation inhibiting method of a wind turbine generator and an inhibiting system. The synchronous oscillation inhibiting method is realized on the basis of a wind power converter; a secondary synchronous oscillation inhibitor based on a secondary synchronous locking phase is added in an original power generation control; a damping component is generated by means of a synchronous coordinate system, and acted on a DQ axis current closed loop; current is dynamically adjusted, electric damping of the unit is enhanced, and thereby happening of secondary synchronous oscillation is inhibited. According to the method, the secondary synchronous oscillation signal is extracted from the electrical quantities, and the method can be adapted to the oscillation frequency and is strong in project practicability.
Description
Technical field
The invention belongs to field of new energy generation is and in particular to a kind of Wind turbines sub-synchronous oscillation suppression method and suppression
System.
Background technology
Progressively expand with wind capacity integrated into grid, its impact to electrical network also progressively manifests.In recent years, multiple areas occur
The regional power grid sub-synchronous oscillation phenomenon that Wind turbines participate in, leads to large area Wind turbines off-grid, or even the neighbouring thermoelectricity of induction
Unit subsynchronous protection device action, causes fired power generating unit to cut machine.In order to avoid sub-synchronous oscillation threatens power grid security, need to adopt
Requisite measure is taken to suppress the generation of sub-synchronous oscillation.
Wind-powered electricity generation participates in the research of sub-synchronous oscillation still in the starting stage, and how the braking measure that presently relevant scholar proposes is from electricity
Net angle is set out, such as install facts device near wind energy turbine set, this can increase extra cost, and engineering parameter debugging is difficult.
Also scholar is had to begin to focus on the suppression method of blower fan side, with reference to the experience of fired power generating unit, proposing increase with speed error signal is
The damping of feedback controls, but the method still has 2 difficult points not solve in engineer applied: 1 be current blower fan rotating speed inclined
Difference accuracy of detection too low it is impossible to meet demand for control；2 is that control method is based on sub-synchronous oscillation frequency it is known that and current wind-powered electricity generation
The sub-synchronous oscillation participating in presents the feature that frequency of oscillation change with operating condition it is difficult to predict frequency of oscillation.
Therefore, need a kind of new technical scheme to solve the above problems.
Content of the invention
It is an object of the present invention to provide a kind of sub-synchronous oscillation suppression method being applied to Wind turbines and suppression system.Can be
Effectively suppress the sub-synchronous oscillation of Wind turbines on the premise of not increasing hardware device, and be easy to Project Realization.
For achieving the above object, Wind turbines sub-synchronous oscillation suppression method of the present invention can adopt following technical side
Case:
A kind of Wind turbines sub-synchronous oscillation suppression method, comprises the steps:
(1), electric current dq axle component is inputted sub-synchronous oscillation suppressor；
(2), described dq axle component in sub-synchronous oscillation suppressor after filtering；
(3), in sub-synchronous oscillation suppressor through park conversion obtain dq axle component i_ssd under subsynchronous coordinate and
I_ssq, wherein, i_ssd is the component of d axle sub-synchronous oscillation frequency, and i_ssq is the component of q axle sub-synchronous oscillation frequency；By i_
Ssq obtains subsynchronous angular velocity omega _ sso through pi actuator, obtains subsynchronous angle to after subsynchronous angular velocity omega _ sso integration
Degree θ _ sso；
(4), by the subsynchronous angle, θ _ sso of input and compensation angle in sub-synchronous oscillation suppressorAddition obtain for
The angle of anti-park conversion isWherein compensate angleThe phase producing for processes such as compensating sampling filtering
Position deviation；
(5), according to anti-park angle of transformation θ ' _ sso, dq axle component i_ssd and i_ssq under subsynchronous coordinate is transformed to together
Under step coordinate system, and obtain subsynchronous electric current dq axle amount of resistant i_sd and i_sq after amplitude limit, wherein i_sd damps for d axle
Amount, i_sq is q axle amount of resistant；
(6), give as electric current loop after dq axle amount of resistant i_sd and i_sq and the superposition of former dq shaft current set-point；I_sd pair
I_ssd forms closed loop feedback control, and produces damping, suppresses d axle sub-synchronous oscillation；It is anti-that i_sq forms closed loop to i_ssq
Feedback controls, and produces damping, suppresses q axle sub-synchronous oscillation.
For achieving the above object, Wind turbines sub-synchronous oscillation suppression system of the present invention can adopt following technical side
Case:
A kind of Wind turbines sub-synchronous oscillation suppression system, comprising:
Sub-synchronous oscillation suppressor；Electric current dq axle component inputs sub-synchronous oscillation suppressor, and dq axle component is subsynchronous
In oscillation suppressor after filtering；And obtain the dq axle under subsynchronous coordinate through park conversion in sub-synchronous oscillation suppressor
Component i_ssd and i_ssq, wherein, i_ssd is the component of d axle sub-synchronous oscillation frequency, and i_ssq is q axle sub-synchronous oscillation frequency
Component；
Pi actuator, i_ssq obtains subsynchronous angular velocity omega _ sso through pi actuator, to subsynchronous angular velocity omega _ sso
Subsynchronous angle, θ _ sso is obtained after integration；
Compensation device, in order in sub-synchronous oscillation suppressor by input subsynchronous angle, θ _ sso with compensate angleIt is added
Obtain for anti-park conversion angle beWherein compensate angleFor processes such as compensating sampling filtering
The phase deviation producing；
Amount of resistant generating means, in order to according to anti-park angle of transformation θ ' _ sso by dq axle component i_ssd under subsynchronous coordinate
Transform under synchronous coordinate system with i_ssq, and obtain subsynchronous electric current dq axle amount of resistant i_sd and i_sq after amplitude limit, wherein
I_sd is d axle amount of resistant, and i_sq is q axle amount of resistant；
Restraining device, in order to using dq axle amount of resistant i_sd and i_sq and former dq shaft current set-point superposition after as electric current loop
Given；I_sd forms closed loop feedback control to i_ssd, and produces damping, suppresses d axle sub-synchronous oscillation；I_sq is to i_ssq
Form closed loop feedback control, and produce damping, suppress q axle sub-synchronous oscillation.
The beneficial effects of the present invention is:
1. the suppression of pair sub-synchronous oscillation is passed through to change the realization of air-blower control strategy, need not increase extra cost；
2. adapt to the feature that existing blower fan electric signal certainty of measurement is more than tach signal certainty of measurement, from electric signal
Extract sub-synchronous oscillation information, accuracy is higher, and inhibition is more preferable；
3. pair sub-synchronous oscillation frequency self adaptation, need not predict sub-synchronous oscillation frequency, without application Fourier analyses
Carry out extract real-time sub-synchronous oscillation frequency Deng complicated algorithm, reduce Project Realization difficulty.
Brief description
Fig. 1 is the control block diagram that in the embodiment of the present invention one, double-fed unit rotor side increases after sub-synchronous oscillation suppression.
Fig. 2 is the schematic diagram of the sub-synchronous oscillation suppressor adopting in the present invention.
Fig. 3 is the schematic diagram of the subsynchronous phaselocked loop adopting in the present invention.
Fig. 4 is sub-synchronous oscillation suppressor application effect simulation waveform in double-fed fan motor unit in the embodiment of the present invention one
Figure.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment, it is further elucidated with the present invention it should be understood that these embodiments are merely to illustrate
The present invention rather than restriction the scope of the present invention, after having read the present invention, those skilled in the art are each to the present invention
The modification planting the equivalent form of value all falls within the application claims limited range.
The invention discloses a kind of Wind turbines sub-synchronous oscillation suppression method based on subsynchronous lock phase and suppression system,
Its design philosophy is to rely on wind electric converter control realization, increases subsynchronous based on subsynchronous lock phase in original Generation Control
Oscillation suppressor ssoi, is respectively acting on d shaft current closed loop and q shaft current closed loop, carries out dynamic regulation to dq shaft current simultaneously,
Strengthen unit electrical damping, thus suppressing the generation of sub-synchronous oscillation.
And specific, this suppressing method comprises the steps:
(1), provide sub-synchronous oscillation suppressor, electric current dq axle component is inputted sub-synchronous oscillation suppressor.
(2), described dq axle component in sub-synchronous oscillation suppressor after filtering；This is filtered into high-pass filtering, cutoff frequency
Rate arranges 2～5hz, is used for filtering DC component.To 2hz cut-off frequency, the transmission function of wave filter is g (s)=s/ (s+
12.57)；To 5hz cut-off frequency, the transmission function of wave filter is g (s)=s/ (s+31.42).
(3), in sub-synchronous oscillation suppressor through park conversion obtain dq axle component i_ssd under subsynchronous coordinate and
I_ssq, wherein, i_ssd is d axle component, and i_ssq is q axle component；I_ssq is obtained subsynchronous angular velocity through pi actuator
ω _ sso, i.e. ω _ sso=(kp+ki/s) * i_ssq, wherein kp are proportionality coefficient, and its size affects tracking velocity, and ki is integration
Coefficient, its size impact overshoot and regulating time, this two coefficients determine, 1/s is according to the real needs of engineer applied
The frequency-domain expression of integration.Obtain subsynchronous angle, θ _ sso, i.e. θ _ sso=(1/ to after subsynchronous angular velocity omega _ sso integration
S) * ω _ sso, wherein 1/s are the frequency-domain expression of integration.
(4), by the subsynchronous angle, θ _ sso of input and compensation angle in sub-synchronous oscillation suppressorAddition obtain for
The angle of anti-park conversionWherein compensate angleThe phase place producing for processes such as compensating sampling filtering
The phase deviation that deviation, such as hardware wave filtering circuit produce can be obtained by signal generator and oscillograph actual measurement.
(5), according to anti-park angle of transformation θ ' _ sso, dq axle component i_ssd and i_ssq under subsynchronous coordinate is transformed to together
Under step coordinate system, and obtain subsynchronous electric current dq axle amount of resistant i_sd and i_sq after amplitude limit, wherein i_sd damps for d axle
Amount, i_sq is q axle amount of resistant.In the present embodiment, the computational methods of amplitude limit are: if i_sd > max, make i_sd=
max；If i_sd < min, make i_sd=min；Otherwise i_sd keep constant, max and min be respectively amplitude limit higher limit and
Lower limit, to i_sq in the same manner.
(6), give as electric current loop after dq axle amount of resistant i_sd and i_sq and the superposition of former dq shaft current set-point.
And correspond to above-mentioned suppressing method, the Wind turbines sub-synchronous oscillation suppression system that the present invention provides includes:
Sub-synchronous oscillation suppressor；Electric current dq axle component inputs sub-synchronous oscillation suppressor, and dq axle component is subsynchronous
In oscillation suppressor after filtering；And obtain the dq axle under subsynchronous coordinate through park conversion in sub-synchronous oscillation suppressor
Component i_ssd and i_ssq, wherein, i_ssd is the component of d axle sub-synchronous oscillation frequency, and i_ssq is q axle sub-synchronous oscillation frequency
Component；Wherein, it is filtered into high-pass filtering in sub-synchronous oscillation suppressor, this high-pass filtering cut-off frequency arranges 2～5hz,
For filtering DC component；
Pi actuator, i_ssq obtains subsynchronous angular velocity omega _ sso through pi actuator, to subsynchronous angular velocity omega _ sso
Subsynchronous angle, θ _ sso is obtained after integration；I.e. ω _ sso=(kp+ki/s) * i_ssq, wherein kp are proportionality coefficient, and ki is integration
Coefficient, 1/s is the frequency-domain expression of integration.θ _ sso=(1/s) * ω _ sso, wherein 1/s are the frequency-domain expression of integration；
Compensation device, in order in sub-synchronous oscillation suppressor by input subsynchronous angle, θ _ sso with compensate angleIt is added
Obtain for anti-park conversion angle beWherein compensate angleFor processes such as compensating sampling filtering
The phase deviation producing；
Amount of resistant generating means, in order to according to anti-park angle of transformation θ ' _ sso by dq axle component i_ssd under subsynchronous coordinate
Transform under synchronous coordinate system with i_ssq, and obtain subsynchronous electric current dq axle amount of resistant i_sd and i_sq after amplitude limit, wherein
I_sd is d axle amount of resistant, and i_sq is q axle amount of resistant；The computational methods of amplitude limit are: if i_sd > max, make i_sd=max；
If i_sd < min, make i_sd=min；Otherwise i_sd keeps constant, max and min is respectively higher limit and the lower limit of amplitude limit
Value；If i_sq > max, make i_sq=max；If i_sq < min, make i_sq=min；Otherwise i_sq keeps constant；
Restraining device, in order to using dq axle amount of resistant i_sd and i_sq and former dq shaft current set-point superposition after as electric current loop
Given；I_sd forms closed loop feedback control to i_ssd, and produces damping, suppresses d axle sub-synchronous oscillation；I_sq is to i_ssq
Form closed loop feedback control, and produce damping, suppress q axle sub-synchronous oscillation.
The application note of the technical scheme of offer of the present invention is provided with specific embodiment below.
Embodiment: apply in double-fed fan motor unit
As shown in figure 1, double-fed unit generated output mainly injects electrical network by generator unit stator, its control generally adopts dq
Decoupler shaft control method, stator current dq axle gives and exports to current transformer by fan master control system, stator current dq axle feedback by
The sampling of current transformer stator current obtains through park conversion, and stator dq axle gives and feedback makes the difference input stator current outer shroud pi and adjusts
Section device, output gives as the dq axle of rotor current internal ring, and rotor current dq axle feedback is sampled by current transformer rotor current and passed through
Park conversion obtains, and rotor dq axle gives and makes the difference input rotor current internal ring pi actuator with feedback, is output as current transformer pusher side
Control voltage, realizes normal control to double-fed generator.Wherein, isdrefAnd isqrefIt is respectively stator current dq axle to give, isdWith
isqFor stator current dq axle feedback, irdrefAnd irqrefGive for rotor current dq axle, irdAnd irqFeed back for rotor current dq axle,
urdAnd urqExport dq axle control voltage for rotor current transformer, ignore the decoupling item of dq between centers.The present invention is normally controlled in double-fed unit
Sub-synchronous oscillation suppressor ssoi is increased, point of addition stator current in rotor current transformer control loop gives on the basis of system
Place.Taking dq axle stator current based on the sub-synchronous oscillation suppressor (ssoi) of subsynchronous lock phase is input, automatically extracts therein
Sub-synchronous oscillation component simultaneously is corrected to phase place compensating, thus generating subsynchronous electric current dq axle amount of resistant i_sd and i_sq, resistance
Buddhist nun's amount is given with stator current and is superimposed thus adjusting active reactive electric current, produces damping suppression sub-synchronous oscillation.Above-mentioned principle with
Fired power generating unit suppresses that the principle of sub-synchronous oscillation is identical, and difference is, fired power generating unit sub-synchronous oscillation frequency is fixing and in advance
Know, subsynchronous component is extracted by the wave trap of fixed frequency, and the sub-synchronous oscillation tool that Wind turbines occur to electrical network
There is unpredictability, may be in the face of the sub-synchronous oscillation of different frequency under different power system operating modes.Therefore suppression difficulty exists
In dynamic extraction sub-synchronous oscillation frequency component, and the mode that the present invention is exactly based on subsynchronous lock phase solves this difficult problem,
Achieve the suppression of Wind turbines sub-synchronous oscillation.
The composition of sub-synchronous oscillation suppressor ssoi is as shown in Figure 2.Stator dq shaft current isdAnd isqFirst pass around 2hz high
Bandpass filter filters DC component, and remaining subsynchronous component sends into phaselocked loop pll, and pll mutually obtains secondary same to subsynchronous component lock
Step angle, θ _ sso, obtains dq axle component i_ssd and i_ssq under subsynchronous rotating coordinate system simultaneously.Sampling and filtering link are produced
Raw deviation is passed through to compensate angleCompensate, after compensation, obtain anti-park angle of transformation θ ' _ sso.Then carry out anti-park conversion,
By subsynchronous coordinate transform to synchronous coordinate, export subsynchronous amount of resistant i_sd and i_sq after amplitude limit.
The composition of phaselocked loop pll is as shown in Figure 3.Input quantity obtains dq axle component through park conversion, then by q axle component
Obtain subsynchronous angular velocity omega _ sso through pi actuator, after integration, obtain subsynchronous angle, θ _ sso.θ _ sso is also used for simultaneously
Above-mentioned park conversion process.Dq axle component filters other frequency interferences signals through low pass filter, obtains subsynchronous component i_
Ssd and i_ssq.
As shown in figure 4, being double-fed unit voltage, stator current, the three-phase waveform of rotor current.Electrical network electricity during normal operation
Pressure, stator current are the 50hz sine wave of standard, and rotor current is the sine wave of slip frequency (general 0～10hz).When secondary
When synchronized oscillation occurs, the component of subsynchronous frequency in line voltage, stator current, occurs, occur secondary same in rotor current
The component of step slip frequency (rotor mechanical frequency deducts subsynchronous frequency).Therefore can be judged by observing subsynchronous component
Whether system occurs sub-synchronous oscillation or vibration to eliminate.Build dual feedback wind power generation system phantom, normally generate electricity by way of merging two or more grid systems
0.6s puts into circuit string and mends afterwards, and sub-synchronous oscillation gradually dissipates, from AC current waveform observation frequency of oscillation 6hz about；1.4s
Put into above-mentioned sub-synchronous oscillation suppression method, sub-synchronous oscillation is gradually restrained, and substantially eliminates vibration to 1.7s.Thus can from Fig. 4
To find out that in emulation, mimic buss string benefit input causes double-fed unit sub-synchronous oscillation, after applying above-mentioned suppressing method, in 1.4s
After putting into above-mentioned sub-synchronous oscillation suppression method, while line voltage keeps stablize, stator current and rotor current secondary
Synchronized oscillation gradually restrains.Further, to after 1.7s, while line voltage keeps stablizing, stator current and rotor
The sub-synchronous oscillation of electric current gradually vibrates disappearance, thus demonstrating the effectiveness of suppressing method.
Above example is only the explanation to technical solution of the present invention, and protection scope of the present invention is not limited to this,
Modification or equivalent that any skilled professional staff is carried out to the specific embodiment of the present invention, should be included in the present invention
Right within.
Claims (10)
1. a kind of Wind turbines sub-synchronous oscillation suppression method is it is characterised in that comprise the steps:
(1), electric current dq axle component is inputted sub-synchronous oscillation suppressor；
(2), described dq axle component in sub-synchronous oscillation suppressor after filtering；
(3), in sub-synchronous oscillation suppressor, obtain dq axle component i_ssd and i_ under subsynchronous coordinate through park conversion
Ssq, wherein, i_ssd is the component of d axle sub-synchronous oscillation frequency, and i_ssq is the component of q axle sub-synchronous oscillation frequency；By i_
Ssq obtains subsynchronous angular velocity omega _ sso through pi actuator, obtains subsynchronous angle to after subsynchronous angular velocity omega _ sso integration
Degree θ _ sso；
(4), by the subsynchronous angle, θ _ sso of input and compensation angle in sub-synchronous oscillation suppressorAddition obtains for anti-
Park conversion angle beWherein compensate angleThe phase place producing for processes such as compensating sampling filtering
Deviation；
(5), according to anti-park angle of transformation θ ' _ sso, dq axle component i_ssd and i_ssq under subsynchronous coordinate is transformed to synchronous seat
Under mark system, and obtain subsynchronous electric current dq axle amount of resistant i_sd and i_sq after amplitude limit, wherein i_sd is d axle amount of resistant, i_
Sq is q axle amount of resistant；
(6), give as electric current loop after dq axle amount of resistant i_sd and i_sq and the superposition of former dq shaft current set-point；I_sd is to i_
Ssd forms closed loop feedback control, and produces damping, suppresses d axle sub-synchronous oscillation；I_sq forms closed loop feedback to i_ssq
Control, and produce damping, suppress q axle sub-synchronous oscillation.
2. Wind turbines sub-synchronous oscillation suppression method according to claim 1 it is characterised in that: in described step (2)
Be filtered into high-pass filtering, this high-pass filtering cut-off frequency arrange 2～5hz, be used for filtering DC component.
3. Wind turbines sub-synchronous oscillation suppression method according to claim 1 it is characterised in that: in described step (3),
Obtain subsynchronous angular velocity omega _ sso, i.e. ω _ sso=(kp+ki/s) * i_ssq, wherein kp is proportionality coefficient, ki is integration system
Number, 1/s is the frequency-domain expression of integration.
4. Wind turbines sub-synchronous oscillation suppression method according to claim 1 it is characterised in that: in described step (3),
Obtain subsynchronous angle, θ _ sso to after subsynchronous angular velocity integration, i.e. θ _ sso=(1/s) * ω _ sso, wherein 1/s are integration
Frequency-domain expression.
5. Wind turbines sub-synchronous oscillation suppression method according to claim 1 it is characterised in that: in described step (5),
The computational methods of amplitude limit are: if i_sd > max, make i_sd=max；If i_sd < min, make i_sd=min；Otherwise i_
Sd keeps constant, max and min is respectively higher limit and the lower limit of amplitude limit, if i_sq > max, make i_sq=max；If
I_sq < min, then make i_sq=min；Otherwise i_sq keeps constant.
6. a kind of Wind turbines sub-synchronous oscillation suppression system is it is characterised in that include:
Sub-synchronous oscillation suppressor；Electric current dq axle component inputs sub-synchronous oscillation suppressor, and dq axle component is in sub-synchronous oscillation
In suppressor after filtering；And obtain the dq axle component under subsynchronous coordinate through park conversion in sub-synchronous oscillation suppressor
I_ssd and i_ssq, wherein, i_ssd is the component of d axle sub-synchronous oscillation frequency, and i_ssq is dividing of q axle sub-synchronous oscillation frequency
Amount；
Pi actuator, i_ssq obtains subsynchronous angular velocity omega _ sso through pi actuator, to subsynchronous angular velocity omega _ sso integration
After obtain subsynchronous angle, θ _ sso；
Compensation device, in order in sub-synchronous oscillation suppressor by input subsynchronous angle, θ _ sso with compensate angleAddition obtains
For anti-park conversion angle beWherein compensate angleProduce for processes such as compensating sampling filtering
Phase deviation；
Amount of resistant generating means, in order to according to anti-park angle of transformation θ ' _ sso by dq axle component i_ssd and i_ under subsynchronous coordinate
Ssq transforms under synchronous coordinate system, and obtains subsynchronous electric current dq axle amount of resistant i_sd and i_sq, wherein i_sd after amplitude limit
For d axle amount of resistant, i_sq is q axle amount of resistant；
Restraining device, in order to give after dq axle amount of resistant i_sd and i_sq and the superposition of former dq shaft current set-point as electric current loop
Fixed；I_sd forms closed loop feedback control to i_ssd, and produces damping, suppresses d axle sub-synchronous oscillation；I_sq is to i_ssq shape
Become closed loop feedback control, and produce damping, suppress q axle sub-synchronous oscillation.
7. Wind turbines sub-synchronous oscillation suppression system according to claim 1 it is characterised in that: sub-synchronous oscillation suppression
It is filtered into high-pass filtering, this high-pass filtering cut-off frequency arranges 2～5hz, is used for filtering DC component in device.
8. Wind turbines sub-synchronous oscillation suppression system according to claim 1 it is characterised in that: subsynchronous angular velocity
ω _ sso, i.e. ω _ sso=(kp+ki/s) * i_ssq, wherein kp are proportionality coefficient, and ki is integral coefficient, and 1/s is the frequency of integration
Domain expression formula.
9. Wind turbines sub-synchronous oscillation suppression system according to claim 1 it is characterised in that: subsynchronous angular velocity amass
Subsynchronous angle, θ _ sso is obtained, i.e. θ _ sso=(1/s) * ω _ sso, wherein 1/s are the frequency-domain expression of integration after point.
10. Wind turbines sub-synchronous oscillation suppression system according to claim 1 it is characterised in that: the calculating side of amplitude limit
Method is: if i_sd > max, make i_sd=max；If i_sd < min, make i_sd=min；Otherwise i_sd keeps constant,
Max and min is respectively higher limit and the lower limit of amplitude limit；If i_sq > max, make i_sq=max；If i_sq < min,
Make i_sq=min；Otherwise i_sq keeps constant.
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| CN107134796A (en) * | 2017-07-05 | 2017-09-05 | 华北电力大学（保定） | A kind of flare up bundling sub-synchronous oscillation suppression method based on improvement active disturbance rejection |
| CN107732921A (en) * | 2017-11-17 | 2018-02-23 | 东南大学 | Quality of power supply composite control apparatus and method of work based on nine switching tube inverters |
| CN109038619A (en) * | 2018-08-16 | 2018-12-18 | 东北大学 | A kind of sub-synchronous oscillation inhibition device and method based on by-pass current compensation |
| CN109546663A (en) * | 2017-09-21 | 2019-03-29 | 南京南瑞继保电气有限公司 | A kind of sub-synchronous oscillation inhibition system damping control signal adjusting method |
| CN109667762A (en) * | 2018-12-13 | 2019-04-23 | 青岛海尔空调器有限总公司 | A kind of method and apparatus inhibiting the single-rotor compressor fluctuation of speed |
| CN110492496A (en) * | 2019-07-09 | 2019-11-22 | 广西电网有限责任公司 | A kind of new sub-synchronous oscillation suppression method of power grid containing wind-powered electricity generation |
| US20220021211A1 (en) * | 2020-07-15 | 2022-01-20 | North China Electric Power University | Method, system and storage medium for suppressing sub/super-synchronous oscillation for direct-drive wind turbine based on energy compensation |
| CN116454921A (en) * | 2023-06-14 | 2023-07-18 | 国电南瑞科技股份有限公司 | Super-capacitor-based power grid subsynchronous oscillation suppression method and system |
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