CN106356874B - A kind of Wind turbines sub-synchronous oscillation suppression method and inhibit system - Google Patents
A kind of Wind turbines sub-synchronous oscillation suppression method and inhibit 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
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Abstract
The invention discloses a kind of Wind turbines sub-synchronous oscillation suppression method and inhibit system, wind electric converter control is relied on to realize, increase the sub-synchronous oscillation suppressor based on subsynchronous locking phase in original Generation Control, damping component is generated by subsynchronous coordinate system, act on DQ shaft current closed loop, dynamic regulation is carried out to electric current, enhances unit electrical damping, to inhibit the generation of sub-synchronous oscillation.The method extracts sub-synchronous oscillation information from electrical quantity, and adaptive to frequency of oscillation, and engineering practicability is strong.
Description
Technical field
The invention belongs to field of new energy generation, and in particular to a kind of Wind turbines sub-synchronous oscillation suppression method and inhibition
System.
Background technique
As wind capacity integrated into grid gradually expands, the influence to power grid also gradually shows.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 induces neighbouring thermoelectricity
The subsynchronous protective device movement of unit, 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 inhibit the generation of sub-synchronous oscillation.
Wind-powered electricity generation participates in the research of sub-synchronous oscillation still in the starting stage, and the braking measure that presently relevant scholar proposes is mostly from electricity
Net angle is set out, such as FACTS device is installed near wind power plant, this will increase extra cost, and engineering parameter debugging is difficult.
Some scholars begin to focus on the inhibition method of blower side, with reference to the experience of fired power generating unit, propose that increase is with speed error signal
The damping control of feedback, however this method still has 2 difficult points not solve in engineer application: 1 be current blower revolving speed it is inclined
Poor detection accuracy is too low, is not able to satisfy demand for control；2 be that control method is based on sub-synchronous oscillation frequency it is known that and current wind-powered electricity generation
The sub-synchronous oscillation of participation presents the characteristics of frequency of oscillation changes with operating condition, it is difficult to predict frequency of oscillation.
Therefore the technical solution for needing one kind new is to solve the above problems.
Summary of the invention
It is an object of the present invention to provide a kind of sub-synchronous oscillation suppression method suitable for Wind turbines and inhibit system.It can be
Effectively inhibit the sub-synchronous oscillation of Wind turbines under the premise of not increasing hardware device, and is easy to Project Realization.
For achieving the above object, following technical side can be used in Wind turbines sub-synchronous oscillation suppression method of the present invention
Case:
A kind of Wind turbines sub-synchronous oscillation suppression method, includes the following steps:
(1), electric current DQ axis component is inputted into sub-synchronous oscillation suppressor；
(2), the DQ axis component is in sub-synchronous oscillation suppressor by filtering；
(3), in sub-synchronous oscillation suppressor by Park convert to obtain DQ axis component I_SSD under subsynchronous coordinate and
I_SSQ, wherein I_SSD is the component of D axis sub-synchronous oscillation frequency, and I_SSQ is the component of Q axis sub-synchronous oscillation frequency；By I_
SSQ obtains subsynchronous angular velocity omega _ SSO by pi regulator, obtains subsynchronous angle after integrating to subsynchronous angular velocity omega _ SSO
Spend θ _ SSO；
(4), by subsynchronous angle, θ _ SSO of input and compensation angle in sub-synchronous oscillation suppressorAddition is used for
The angle of anti-Park transformation isWherein compensate angleThe phase generated for processes such as compensating sampling filtering
Position deviation；
(5), DQ axis component I_SSD and I_SSQ under subsynchronous coordinate is transformed to together according to anti-Park angle of transformation θ ' _ SSO
It walks under coordinate system, and obtains subsynchronous electric current DQ axis amount of resistant I_SD and I_SQ after clipping, wherein I_SD is the damping of D axis
Amount, I_SQ are Q axis amount of resistant；
(6), it is given after DQ axis amount of resistant I_SD and I_SQ and the superposition of original DQ shaft current given value as electric current loop；I_SD pairs
I_SSD forms closed loop feedback control, and generates damping, inhibits D axis sub-synchronous oscillation；It is anti-that I_SQ forms closed loop to I_SSQ
Feedback control, and damping is generated, inhibit Q axis sub-synchronous oscillation.
For achieving the above object, Wind turbines sub-synchronous oscillation of the present invention inhibits system that following technical side can be used
Case:
A kind of Wind turbines sub-synchronous oscillation inhibition system, comprising:
Sub-synchronous oscillation suppressor；Electric current DQ axis component inputs sub-synchronous oscillation suppressor, and DQ axis component is subsynchronous
By filtering in oscillation suppressor；And convert to obtain the DQ axis under subsynchronous coordinate by Park in sub-synchronous oscillation suppressor
Component I_SSD and I_SSQ, wherein I_SSD is the component of D axis sub-synchronous oscillation frequency, and I_SSQ is Q axis sub-synchronous oscillation frequency
Component；
Pi regulator, I_SSQ obtains subsynchronous angular velocity omega _ SSO by pi regulator, to subsynchronous angular velocity omega _ SSO
Subsynchronous angle, θ _ SSO is obtained after integral；
Compensation device, in sub-synchronous oscillation suppressor by subsynchronous angle, θ _ SSO of input and compensation anglePhase
Add to obtain for anti-Park transformation angle i.e.Wherein compensate angleIt was waited for compensating sampling filtering
The phase deviation that journey generates；
Amount of resistant generating means, to according to anti-Park angle of transformation θ ' _ SSO by DQ axis component I_SSD under subsynchronous coordinate
It is transformed under synchronous coordinate system with I_SSQ, and obtains subsynchronous electric current DQ axis amount of resistant I_SD and I_SQ after clipping, wherein
I_SD is D axis amount of resistant, and I_SQ is Q axis amount of resistant；
Inhibit device, electric current loop will be used as after DQ axis amount of resistant I_SD and I_SQ and the superposition of original DQ shaft current given value
It is given；I_SD forms closed loop feedback control to I_SSD, and generates damping, inhibits D axis sub-synchronous oscillation；I_SQ is to I_SSQ
Closed loop feedback control is formed, and generates damping, inhibits Q axis sub-synchronous oscillation.
The beneficial effects of the present invention are:
1. the inhibition of pair sub-synchronous oscillation is realized by changing air-blower control strategy, without increasing extra cost；
2. the characteristics of existing blower electric signal measurement accuracy is greater than tach signal measurement accuracy is adapted to, from electric signal
Sub-synchronous oscillation information is extracted, accuracy is higher, and inhibitory effect is more preferable；
3. it is adaptive to sub-synchronous oscillation frequency, without predicting sub-synchronous oscillation frequency, without using Fourier analysis
Carry out extract real-time sub-synchronous oscillation frequency Deng complicated algorithm, reduces difficulty in engineering realization.
Detailed description of the invention
Fig. 1 is that double-fed unit rotor side increases the control block diagram after sub-synchronous oscillation inhibits in the embodiment of the present invention one.
Fig. 2 is the schematic diagram of the sub-synchronous oscillation suppressor used in the present invention.
Fig. 3 is the schematic diagram of the subsynchronous phaselocked loop used 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
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
It the present invention rather than limits the scope of the invention, after the present invention has been read, those skilled in the art are to of the invention each
The modification of kind equivalent form falls within the application range as defined in the appended claims.
The invention discloses a kind of Wind turbines sub-synchronous oscillation suppression method based on subsynchronous locking phase and inhibit system,
Its design philosophy is that wind electric converter control is relied on to realize, is increased in original Generation Control based on the subsynchronous of subsynchronous locking phase
Oscillation suppressor SSOI is respectively acting on D shaft current closed loop and Q shaft current closed loop, while carrying out dynamic regulation to DQ shaft current,
Enhance unit electrical damping, to inhibit the generation of sub-synchronous oscillation.
And specifically, the suppressing method includes the following steps:
(1), sub-synchronous oscillation suppressor is provided, electric current DQ axis component is inputted into sub-synchronous oscillation suppressor.
(2), the DQ axis component is in sub-synchronous oscillation suppressor by filtering；This is filtered into high-pass filtering, cutoff frequency
2~5Hz is arranged in rate, for filtering out DC component.To 2Hz cutoff frequency, the transmission function of filter is G (s)=s/ (s+
12.57)；To 5Hz cutoff frequency, the transmission function of filter is G (s)=s/ (s+31.42).
(3), in sub-synchronous oscillation suppressor by Park convert to obtain DQ axis component I_SSD under subsynchronous coordinate and
I_SSQ, wherein I_SSD is D axis component, and I_SSQ is Q axis component；I_SSQ is obtained into subsynchronous angular speed by pi regulator
ω _ SSO, i.e. ω _ SSO=(Kp+Ki/s) * I_SSQ, wherein Kp is proportionality coefficient, and size influences tracking velocity, and Ki is integral
Coefficient, size influences overshoot and regulating time, the two coefficients determine that 1/s is according to the specific requirements of engineer application
The frequency-domain expression of integral.Subsynchronous angle, θ _ SSO, i.e. θ _ SSO=(1/ are obtained after integrating to subsynchronous angular velocity omega _ SSO
S) * ω _ SSO, wherein 1/s is the frequency-domain expression of integral.
(4), by subsynchronous angle, θ _ SSO of input and compensation angle in sub-synchronous oscillation suppressorAddition is used for
The angle of anti-Park transformationWherein compensate angleThe phase generated for processes such as compensating sampling filtering
Deviation, such as the phase deviation that hardware wave filtering circuit generates can survey to obtain by signal generator and oscillograph.
(5), DQ axis component I_SSD and I_SSQ under subsynchronous coordinate is transformed to together according to anti-Park angle of transformation θ ' _ SSO
It walks under coordinate system, and obtains subsynchronous electric current DQ axis amount of resistant I_SD and I_SQ after clipping, wherein I_SD is the damping of D axis
Amount, I_SQ are Q axis amount of resistant.In the present embodiment, the calculation method of clipping are as follows: if I_SD > Max, enable I_SD=
Max；If I_SD < Min enables I_SD=Min；Otherwise I_SD is remained unchanged, Max and Min be respectively clipping upper limit value and
Lower limit value, similarly to I_SQ.
(6), it is given after DQ axis amount of resistant I_SD and I_SQ and the superposition of original DQ shaft current given value as electric current loop.
And corresponding above-mentioned suppressing method, Wind turbines sub-synchronous oscillation inhibition system provided by the invention include:
Sub-synchronous oscillation suppressor；Electric current DQ axis component inputs sub-synchronous oscillation suppressor, and DQ axis component is subsynchronous
By filtering in oscillation suppressor；And convert to obtain the DQ axis under subsynchronous coordinate by Park in sub-synchronous oscillation suppressor
Component I_SSD and I_SSQ, wherein I_SSD is the component of D axis sub-synchronous oscillation frequency, and I_SSQ is Q axis sub-synchronous oscillation frequency
Component；Wherein, it is filtered into high-pass filtering in sub-synchronous oscillation suppressor, which is arranged 2~5Hz,
For filtering out DC component；
Pi regulator, I_SSQ obtains subsynchronous angular velocity omega _ SSO by pi regulator, to subsynchronous angular velocity omega _ SSO
Subsynchronous angle, θ _ SSO is obtained after integral；That is ω _ SSO=(Kp+Ki/s) * I_SSQ, wherein Kp is proportionality coefficient, and Ki is integral
Coefficient, 1/s are the frequency-domain expression of integral.θ _ SSO=(1/s) * ω _ SSO, wherein 1/s is the frequency-domain expression of integral；
Compensation device, in sub-synchronous oscillation suppressor by subsynchronous angle, θ _ SSO of input and compensation angleIt is added
Obtain the angle converted for anti-Park i.e.Wherein compensate angleFor processes such as compensating sampling filtering
The phase deviation of generation；
Amount of resistant generating means, to according to anti-Park angle of transformation θ ' _ SSO by DQ axis component I_SSD under subsynchronous coordinate
It is transformed under synchronous coordinate system with I_SSQ, and obtains subsynchronous electric current DQ axis amount of resistant I_SD and I_SQ after clipping, wherein
I_SD is D axis amount of resistant, and I_SQ is Q axis amount of resistant；The calculation method of clipping are as follows: if I_SD > Max, enable I_SD=Max；
If I_SD < Min enables I_SD=Min；Otherwise I_SD is remained unchanged, and Max and Min are respectively the upper limit value and lower limit of clipping
Value；If I_SQ > Max enables I_SQ=Max；If I_SQ < Min enables I_SQ=Min；Otherwise I_SQ is remained unchanged；
Inhibit device, electric current loop will be used as after DQ axis amount of resistant I_SD and I_SQ and the superposition of original DQ shaft current given value
It is given；I_SD forms closed loop feedback control to I_SSD, and generates damping, inhibits D axis sub-synchronous oscillation；I_SQ is to I_SSQ
Closed loop feedback control is formed, and generates damping, inhibits Q axis sub-synchronous oscillation.
The application note of technical solution provided by the invention is carried out with specific embodiment below.
Embodiment: it is applied in double-fed fan motor unit
As shown in Figure 1, double-fed unit generated output mainly injects power grid by generator unit stator, control generallys use DQ
Decoupler shaft control method, stator current DQ axis is given to be exported by fan master control system to current transformer, stator current DQ axis feedback by
The sampling of current transformer stator current converts to obtain by Park, and stator DQ axis is given to make the difference input stator current outer ring PI tune with feedback
Device is saved, exports and is given as the DQ axis of rotor current inner ring, rotor current DQ axis feedback is sampled by current transformer rotor current passes through
Park converts to obtain, and rotor DQ axis is given to make the difference input rotor current inner ring pi regulator with feedback, exports as current transformer pusher side
Voltage is controlled, normal control is realized to double-fed generator.Wherein, isdrefAnd isqrefRespectively stator current DQ axis is given, isdWith
isqFor stator current DQ axis feedback, irdrefAnd irqrefGiven, the i for rotor current DQ axisrdAnd irqIt is fed back for rotor current DQ axis,
urdAnd urqDQ axis is exported for rotor current transformer and controls voltage, ignores the decoupling item of DQ between centers.The present invention is normally controlled in double-fed unit
Sub-synchronous oscillation suppressor SSOI is increased on the basis of system, point of addition stator current in rotor current transformer control loop is given
Place.Sub-synchronous oscillation suppressor (SSOI) based on subsynchronous locking phase takes DQ axis stator current for input, automatically extracts therein
Sub-synchronous oscillation component is simultaneously corrected compensation to phase, to generate subsynchronous electric current DQ axis amount of resistant I_SD and I_SQ, hinders
Buddhist nun's amount gives with stator current to be superimposed to adjust active reactive electric current, is generated damping and is inhibited sub-synchronous oscillation.Above-mentioned principle with
Fired power generating unit inhibits the principle of sub-synchronous oscillation identical, and difference is, fired power generating unit sub-synchronous oscillation frequency is fixed and preparatory
Know, subsynchronous component is extracted by the trapper of fixed frequency, and Wind turbines have the sub-synchronous oscillation that power grid occurs
There is unpredictability, the sub-synchronous oscillation of different frequency may be faced under different grid operation modes.Therefore difficulty is inhibited to exist
In Dynamic Extraction sub-synchronous oscillation frequency component, and the mode that the present invention is exactly based on subsynchronous locking phase solves this problem,
Realize the inhibition 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 out DC component, and remaining subsynchronous component is sent into phase-locked loop pll, and PLL obtains subsynchronous component locking phase secondary same
Angle, θ _ SSO is walked, while obtaining DQ axis component I_SSD and I_SSQ under subsynchronous rotating coordinate system.Sampling and filtering link produce
Raw deviation passes through compensation angleIt compensates, anti-Park angle of transformation θ ' _ SSO is obtained after compensation.Then anti-Park transformation is carried out,
By subsynchronous coordinate transform to synchronous coordinate, subsynchronous amount of resistant I_SD and I_SQ is exported after clipping.
The composition of phase-locked loop pll is as shown in Figure 3.Input quantity converts to obtain DQ axis component by Park, then by Q axis component
Subsynchronous angular velocity omega _ SSO is obtained by pi regulator, subsynchronous angle, θ _ SSO is obtained after integral.θ _ SSO is also used for simultaneously
Above-mentioned Park conversion process.DQ axis component filters out other frequency interferences signals by low-pass filter, obtains subsynchronous component I_
SSD and I_SSQ.
As shown in figure 4, being the three-phase waveform of double-fed unit voltage, stator current, rotor current.Power grid electricity when 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
It when synchronized oscillation occurs, will appear the component of subsynchronous frequency in network voltage, stator current, will appear in rotor current secondary same
Walk the component of slip frequency (rotor mechanical frequency subtracts subsynchronous frequency).Therefore can be judged by observation subsynchronous component
Whether system occurs sub-synchronous oscillation or oscillation is eliminated.Dual feedback wind power generation system simulation model is built, is normally generated electricity by way of merging two or more grid systems
0.6s puts into route string and mends afterwards, and sub-synchronous oscillation gradually dissipates, from AC current waveform observation frequency of oscillation 6Hz or so；1.4s
Above-mentioned sub-synchronous oscillation suppression method is put into, sub-synchronous oscillation is gradually restrained, and substantially eliminates oscillation to 1.7s.Thus can from Fig. 4
To find out, analog line string benefit investment causes double-fed unit sub-synchronous oscillation in emulation, after above-mentioned suppressing method, in 1.4s
After putting into above-mentioned sub-synchronous oscillation suppression method, while network voltage keeps stablizing, time of stator current and rotor current
Synchronized oscillation gradually restrains.Further, to after 1.7s, while network voltage keeps stablizing, stator current and rotor
The sub-synchronous oscillation of electric current gradually vibrates disappearance, to demonstrate the validity of suppressing method.
Above embodiments are only the explanations to technical solution of the present invention, and protection scope of the present invention is not limited to this,
The modification or equivalent replacement that any skilled professional staff carries out specific embodiments of the present invention, should be included in the present invention
Scope of the claims within.
Claims (10)
1. a kind of Wind turbines sub-synchronous oscillation suppression method, which comprises the steps of:
(1), electric current DQ axis component under synchronous coordinate system is inputted into sub-synchronous oscillation suppressor；
(2), the DQ axis component obtains sub-synchronous oscillation component I_SD α and I_ by filtering in sub-synchronous oscillation suppressor
SQβ；
(3), in sub-synchronous oscillation suppressor, I_SD α and I_SQ β convert to obtain the DQ axis under subsynchronous coordinate point by Park
Measure I_SSD and I_SSQ, wherein I_SSD is the component of D axis sub-synchronous oscillation frequency, and I_SSQ is Q axis sub-synchronous oscillation frequency
Component；I_SSQ is obtained into subsynchronous angular velocity omega _ SSO by pi regulator, is obtained after being integrated to subsynchronous angular velocity omega _ SSO
Subsynchronous angle, θ _ SSO；
(4), by subsynchronous angle, θ _ SSO of input and compensation angle in sub-synchronous oscillation suppressorAddition is obtained for anti-
Park transformation angle beWherein compensate angleThe phase generated for compensating sampling filtering is inclined
Difference；
(5), DQ axis component I_SSD under subsynchronous coordinate is transformed into synchronous seat with I_SSQ according to anti-Park angle of transformation θ ' _ SSO
I_SD α ' and I_SQ β ' is obtained under mark system, subsynchronous electric current DQ axis amount of resistant is obtained after clipping, is defined as I_SD and I_SQ,
Wherein I_SD is D axis amount of resistant, and I_SQ is Q axis amount of resistant；
(6), it is given after DQ axis amount of resistant I_SD and I_SQ and the superposition of original DQ shaft current given value as electric current loop；I_SD is to I_
SSD forms closed loop feedback control, and generates damping, inhibits D axis sub-synchronous oscillation；I_SQ forms closed loop feedback to I_SSQ
Control, and damping is generated, inhibit Q axis sub-synchronous oscillation.
2. Wind turbines sub-synchronous oscillation suppression method according to claim 1, it is characterised in that: in the step (2)
Be filtered into high-pass filtering, the high-pass filtering cutoff frequency be arranged 2~5Hz, for filtering out DC component.
3. Wind turbines sub-synchronous oscillation suppression method according to claim 1, it is characterised in that: in the step (3),
Subsynchronous angular velocity omega _ SSO, i.e. ω _ SSO=(Kp+Ki/s) * I_SSQ are obtained, wherein Kp is proportionality coefficient, and Ki is integration system
Number, 1/s are the frequency-domain expression of integral.
4. Wind turbines sub-synchronous oscillation suppression method according to claim 1, it is characterised in that: in the step (3),
To subsynchronous angle, θ _ SSO, i.e. θ _ SSO=(1/s) * ω _ SSO is obtained after subsynchronous angular speed integral, wherein 1/s is integral
Frequency-domain expression.
5. Wind turbines sub-synchronous oscillation suppression method according to claim 1, it is characterised in that: in the step (5),
The calculation method of clipping are as follows: if I_SD > Max, enable I_SD=Max；If I_SD < Min enables I_SD=Min；Otherwise I_
SD is remained unchanged, and Max and Min are respectively that the upper limit value and lower limit value of clipping enable I_SQ=Max if I_SQ > Max；If
I_SQ < Min then enables I_SQ=Min；Otherwise I_SQ is remained unchanged.
6. a kind of Wind turbines sub-synchronous oscillation inhibits system characterized by comprising
Sub-synchronous oscillation suppressor；Electric current DQ axis component inputs sub-synchronous oscillation suppressor, and DQ axis component under synchronous coordinate system
By filtering in sub-synchronous oscillation suppressor, sub-synchronous oscillation component I_SD α and I_SQ β are obtained；Then it is converted by Park
Obtain DQ the axis component I_SSD and I_SSQ under subsynchronous coordinate, wherein I_SSD is the component of D axis sub-synchronous oscillation frequency, I_
SSQ is the component of Q axis sub-synchronous oscillation frequency；
Pi regulator, I_SSQ obtain subsynchronous angular velocity omega _ SSO by pi regulator, integrate to subsynchronous angular velocity omega _ SSO
After obtain subsynchronous angle, θ _ SSO；
Compensation device, in sub-synchronous oscillation suppressor by subsynchronous angle, θ _ SSO of input and compensation angleAddition obtains
It is for the anti-Park angle convertedWherein compensate angleIt is generated for compensating sampling filtering
Phase deviation；
Amount of resistant generating means, to according to anti-Park angle of transformation θ ' _ SSO by DQ axis component I_SSD and I_ under subsynchronous coordinate
SSQ, which is transformed to, obtains I_SD α ' and I_SQ β ' under synchronous coordinate system, subsynchronous electric current DQ axis amount of resistant is obtained after clipping, fixed
Justice is I_SD and I_SQ, and wherein I_SD is D axis amount of resistant, and I_SQ is Q axis amount of resistant；
Inhibit device, will give after DQ axis amount of resistant I_SD and I_SQ and the superposition of original DQ shaft current given value as electric current loop
It is fixed；I_SD forms closed loop feedback control to I_SSD, and generates damping, inhibits D axis sub-synchronous oscillation；I_SQ is to I_SSQ shape
At closed loop feedback control, and damping is generated, inhibits Q axis sub-synchronous oscillation.
7. Wind turbines sub-synchronous oscillation according to claim 6 inhibits system, it is characterised in that: sub-synchronous oscillation inhibits
It is filtered into high-pass filtering in device, which is arranged 2~5Hz, for filtering out DC component.
8. Wind turbines sub-synchronous oscillation according to claim 6 inhibits system, it is characterised in that: subsynchronous angular speed
ω _ SSO, i.e. ω _ SSO=(Kp+Ki/s) * I_SSQ, wherein Kp is proportionality coefficient, and Ki is integral coefficient, and 1/s is the frequency of integral
Domain expression formula.
9. Wind turbines sub-synchronous oscillation according to claim 6 inhibits system, it is characterised in that: subsynchronous angular speed product
Subsynchronous angle, θ _ SSO, i.e. θ _ SSO=(1/s) * ω _ SSO are obtained after point, wherein 1/s is the frequency-domain expression of integral.
10. Wind turbines sub-synchronous oscillation according to claim 6 inhibits system, it is characterised in that: the calculating side of clipping
Method are as follows: if I_SD > Max, enable I_SD=Max；If I_SD < Min enables I_SD=Min；Otherwise I_SD is remained unchanged,
Max and Min is respectively the upper limit value and lower limit value of clipping；If I_SQ > Max enables I_SQ=Max；If I_SQ < Min,
Enable I_SQ=Min；Otherwise I_SQ is remained unchanged.
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| CN109546663B (en) * | 2017-09-21 | 2021-12-10 | 南京南瑞继保电气有限公司 | Method for adjusting damping control signal of subsynchronous oscillation suppression system |
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| CN109038619B (en) * | 2018-08-16 | 2021-06-01 | 东北大学 | Subsynchronous oscillation suppression device and method based on bypass current compensation |
| CN109667762B (en) * | 2018-12-13 | 2021-07-23 | 重庆海尔空调器有限公司 | Method and device for inhibiting rotating speed fluctuation of single-rotor compressor |
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