CN107086586A - The reactive-load compensation method of wind farm group based on the idle generating ability of double-fed blower fan - Google Patents
The reactive-load compensation method of wind farm group based on the idle generating ability of double-fed blower fan Download PDFInfo
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Abstract
The reactive-load compensation method of the wind farm group based on the idle generating ability of double-fed blower fan of the invention, it is characterised in that the content of this method is：According to the active power information and double feedback electric engine and the essential information of transverter of the output inside wind power plant, calculate the idle limit of separate unit double-fed blower fan, then each separate unit double-fed blower fan reactive power auxiliary service in each wind power plant is summed, draw the capacity limit of the reactive power regulation of single wind power plant, scope reference is provided for the setting of dispatching of power netwoks value, the idle limit range value in each wind power plant is calculated, the reactive power distribution of wind farm group is carried out on this basis；Obtain the offset of the reactive power of each wind power plant, to offset carry out order sequence, complete to respectively there is the mutual compensation of the reactive power of the wind power plant two-by-two of supply and demand, carry out successive ignition needs the part compensated to go to complete reactive-load compensation using the reactive-load compensation equipment inside corresponding wind power plant until that can not complete compensation mutually, residue.
Description
Technical field
The invention belongs to wind power-generating grid-connected reactive power compensation control technology field, and in particular to one kind is based on double-fed wind
The reactive-load compensation method of the wind farm group of machine is idle generating ability.
Background technology
Wind-powered electricity generation is utilized as the energy of cleanliness without any pollution by extensive praise highly in recent years, but wind power plant quantifies construction and causes me
State's wind-powered electricity generation industry has the accumulation of amount, but the lifting without matter, because the blower fan of the most of wind field of China all uses power factor
Run, so behave simply, but do not make full use of double-fed blower fan to send reactive power for 1 invariable power mode
The characteristics of, and use the wind power plant that constant power factor runs for 1 mode not sent out because double-fed blower fan only sends active power
Go out reactive power, so needing to be equipped with the reactive-load compensator of Large Copacity when wind farm grid-connected to compensate the substantial amounts of nothing needed for power network
Work(power ensures the stabilization of voltage, but the cost of installation and maintenance of reactive-load compensation equipment is very high, and fault rate is high, this
Also the later maintenance cost of wind power plant is in a disguised form added, the generating efficiency of double-fed blower fan is reduced.China's major part wind power plant is big
The blower fan of double feedback electric engine is all used, this kind of blower fan uses stator and rotor sructure, and stator is directly accessed power network, and rotor passes through the change of current
Device accesses power network, realizes active and idle uneoupled control by the control of transverter, and can operate in non-unity power factor
Under, enable to blower fan to send a part of reactive power by adjusting power factor.
Use power factor for 1 output-constant operation for the double-fed blower fan in the most of wind power plants of China, there is no abundant
Lack unified rational idle work(using the idle generating ability of double-fed blower fan, and between each wind power plant in wind farm group
The rate method of salary distribution, Lang Yongqiang et al. exists《Double feedback electric engine wind power plant reactive power is analyzed and control strategy》(Lang Yongqiang, Zhang Xueguang,
Xu Dianguo, waits double feedback electric engines wind power plant reactive power to analyze and control strategy [J] Proceedings of the CSEEs, and 2007,27
(9):The reactive power sent to wind power plant is proposed in 77-82.) to local user's direct compensation, double-fed blower interior turns surely
Reactive power of the reactive power mutually between compensation and wind turbine between son is compensated mutually, because wind power plant is built in mostly
Scarcely populated area, it is difficult to there is user closely directly to carry out reactive-load compensation, the control strategy is it is emphasised that to single wind-powered electricity generation
The idle control strategy of field, although the strategy can meet the reactive requirement inside single wind power plant, but the strategy is needed to wind
Machine does many control actions, is easily caused the raising of fan trouble rate, and the strategy does not account for multiple wind power plant compositions
Wind farm group internal mutual compensation, resource do not make full use of.
The content of the invention
In view of the shortcomings of the prior art, the technical problem that intends to solve of the present invention there is provided one kind based on double-fed blower fan (or wind
Machine) idle generating ability wind farm group reactive-load compensation method, this method solve prior art between wind power plant lack
The problem of reactive power information exchange, divided by active and reactive power the output to each wind power plant in wind farm group
Analysis, it is that undercompensation (compensation for needing reactive power) or overcompensation (have unnecessary nothing to reactive power to judge the wind power plant
Work(power), then information is passed at wind farm group power monitoring control (to the reactive power of each wind power plant by transmission line
Received, the place for calculating and distributing), by the undercompensation of the reactive power of all wind power plants, excessively benefit in wind farm group
Repay to be allocated to calculate and realize the idle equilibrium of supply and demand of each wind power plant.Control method using the present invention can make single wind power plant
Interior blower fan gives full play to the idle generating ability of itself, the use capacity of reactive-load compensation equipment in wind power plant is reduced, without right
Existing wind power plant carries out big change, and control method is simple and easy to apply, realizes the interaction compensation of the reactive power between wind power plant.
The technical scheme that the present invention solves the technical problem use is to provide one kind based on the idle generation energy of double-fed blower fan
The reactive-load compensation method of the wind farm group of power, it is characterised in that the content of this method is：According to having for the output inside wind power plant
The essential information of work(power information and double feedback electric engine and transverter, calculates the idle limit of separate unit double-fed blower fan, then to every
Each separate unit double-fed blower fan reactive power auxiliary service summation in individual wind power plant, draws the ability pole of the reactive power regulation of single wind power plant
Limit, provides scope reference for the setting of dispatching of power netwoks value, calculates the idle limit range value in each wind power plant, herein
On the basis of carry out wind farm group reactive power distribution；The offset of the reactive power of each wind power plant is obtained, offset is entered
Row order sorts, and completes, to respectively there is the mutual compensation of the reactive power of the wind power plant two-by-two of supply and demand, to carry out successive ignition until nothing
Method completes mutual compensation, and residue needs the part compensated to go to complete idle using the reactive-load compensation equipment inside corresponding wind power plant
Compensation, when power network needs a large amount of reactive powers, then can reduce the active output of part double-fed blower fan, double-fed blower fan is considered as
Reactive source sends idle, needed for compensation power network.
Compared with prior art, the beneficial effects of the invention are as follows：
Prior art is mostly that the compensation of single game is carried out according to the reactive power of double-fed blower fan inside single wind power plant, single
Wind power plant overcompensation sometimes, undercompensation, only focuses on the reactive power compensation inside single wind power plant, have ignored wind-powered electricity generation sometimes
The mutual compensation of reactive power between；And the reactive power that the present invention stresses in wind farm group between each wind power plant is mutual
Compensation, establishes the supply and demand contact of the reactive power between each wind power plant, makes full use of the double-fed blower fan Reactive-power control of itself
Ability to carry out reactive-load compensation to power network, allows each wind power plant to be changed into an adjustable reactive source of dynamic, reduces each wind-powered electricity generation
The use capacity of reactive-load compensation equipment in, and using wind farm group to rely on, the aggregation of data of several wind power plants is handled
Each Reactive Compensation in Wind Farm capacity task is distributed in optimization afterwards so that the idle resource that blower fan is sent in itself, which is utilized, reaches maximum
Change.
Brief description of the drawings
Fig. 1 is the control flow of the reactive-load compensation method of the wind farm group of the invention based on the idle generating ability of double-fed blower fan
Figure；
At single wind power monitoring and controlling and at wind farm group power monitoring control it is wind power plant and wind-powered electricity generation in figure
The field existing equipment of group, the present invention simply provides the control method of reactive power on the basis of these equipment, makes double-fed blower fan
The reactive power sent, which is utilized, reaches maximization.
Embodiment
The present invention is explained further with reference to embodiment and accompanying drawing, but is not protected in this, as to the application claim
Protect the restriction of scope.
The reactive-load compensation method (referring to Fig. 1) of wind farm group of the invention based on the idle generating ability of double-fed blower fan, according to
The active power information of output inside wind power plant and the essential information of double feedback electric engine and transverter, calculate separate unit double-fed wind
The limit that machine is idle, then sums to each separate unit double-fed blower fan reactive power auxiliary service in each wind power plant, draws single wind power plant
The capacity limit of reactive power regulation, provides scope reference for the setting of dispatching of power netwoks value, calculates in each wind power plant
Idle limit range value, carries out the reactive power distribution of wind farm group on this basis；Obtain the idle work(of each wind power plant
The offset of rate, to offset carry out order sequence, is completed to respectively there is the mutual benefit of the reactive power of the wind power plant two-by-two of supply and demand
Repay, carry out successive ignition needs the part compensated using inside corresponding wind power plant until that can not complete compensation mutually, residue
Reactive-load compensation equipment goes to complete reactive-load compensation, when power network needs a large amount of reactive powers, then can reduce part double-fed blower fan
Active output, is considered as reactive source by double-fed blower fan and sends idle, needed for compensation power network, so passes through having inside single wind power plant
Regulation and the idle generation energy of double-fed blower fan can either be made full use of to the reactive power dispatching distribution of wind farm group that work(is idle
Power, can reduce the use of Reactive Compensation in Wind Farm equipment again；
Comprise the following steps that：
1) the Reactive-power control scope of separate unit double-fed blower fan is calculated：
According to the input-output characteristic of the stator and rotor sructure feature of double-fed blower fan and active and reactive power according to formula (1)
Obtain the maximum Q of separate unit double-fed blower fan output reactive power in wind farm groupUnit maxWith the minimum value of output reactive power
QUnit min, then the reactive power Q of the output of wind farm group separate unit double-fed blower fan alwaysUnitLimit range be：QUnit min≤QUnit≤
QUnit max, the limit range is the Reactive-power control scope of separate unit double-fed blower fan；
In formula, LmAnd LsThe mutual inductance between double-fed fan stator and self-induction, U are represented respectivelysRepresent the electricity of double-fed fan stator side
Pressure, IrmaxRepresent the maximum current that double-fed fan rotor side transverter is allowed to flow through, PsRepresent having for double-fed fan stator side output
Work(power, ω1Represent the rotor speed of double-fed blower fan, ScmaxRepresent the maximum capacity of double-fed blower fan net side transverter；S is slip
Rate；
2) the reactive power distribution of wind farm group is determined：
2-1 sets the quantity of wind power plant in studied wind farm group as m, m >=3, double-fed blower fan in each wind power plant
Quantity be n platforms, and each wind power plant in double-fed blower fan number it is identical；To the reactive power of all double-fed blower fans of single wind power plant
Solving Limit and, will all separate unit double-fed blower fan output reactive powers maximum summation, while by all separate unit double-fed blower fans
The minimum value summation of output reactive power, respectively obtains the maximum Q that the reactive power of single wind power plant is exerted oneselfSingle game maxAnd minimum
Value QSingle game min, then the Reactive-power control limit of power of single wind power plant is [QSingle game min,QSingle game max]；
Reactive-load compensation instruction is issued to each wind power plant of wind farm group at 2-2 wind farm group power monitoring controls, and should
Reactive-load compensation instructs QSchedulingFormula (2) is met,
QSingle game min≤QScheduling≤QSingle game max(2),
Total reactive power value Q that reactive-load compensation instruction is sent with single wind power plant is tried to achieve by formula (3)Single game is totalDifference DELTA
Q, total reactive power value Q that the single wind power plant is sentSingle game is totalDirectly obtained, passed through by wind farm group power detection control
Judge that difference DELTA Q size is controlled compensation to the reactive power of wind farm group；
Δ Q=QScheduling-QSingle game is total(3),
If Δ Q ＞ 0, then it represents that the single wind power plant is idle to be occurred, and is insufficient to compensate for the reactive power needed for double-fed blower fan,
Need to carry out reactive-load compensation to the wind power plant, the nothing as needed for giving the wind power plant by the unnecessary reactive power compensation of other wind power plants
Work(power or enable reactive-load compensation equipment (SVC (static reactive power compensation equipment)) inside the wind power plant etc.；
If Δ Q ＜ 0, then it represents that the reactive power that single wind power plant is sent is except disclosure satisfy that idle work(inside the wind power plant
The compensation of rate demand is outer, and also unnecessary reactive power can compensate for giving other wind power plants；
2-3 according to step 2-2 try to achieve all wind power plants in the wind farm group containing m wind power plant reactive-load compensation instruction with
The difference for total reactive power value that the corresponding single wind power plant is sent, the difference represents the 1st to m-th of wind power plant respectively
Reactive power compensation difference, difference is sequentially ranked up according to size (from big to small or from small to large), after sequence represent
For Δ Q1,ΔQ2,…,ΔQm, all reactive power compensation differences sorted are added according to formula (4) head and the tail combination of two, obtained
Value after to reactive-load compensation：
ΔQj *=Δ Qi+ΔQm-i+1(4),
In formula,Represent that two wind power plant reactive powers compensate adding and Δ Q for differenceiRepresent i-th of wind after sequence
The reactive power spill-out of electric field, Δ Qm-i+1The reactive power spill-out of the m-i+1 wind power plant after sequence is represented, now
When m is odd number, the compensation difference not summed up participates in next minor sort；
If two-by-two after wind-powered electricity generation field compensation plus and Δ Qj *≠ 0, then it represents that one of wind power plant does not have to another wind power plant
Have and complete complete compensation, then by the Δ Q being not zero tried to achievej *Value is carried out after size sequence again, is continued the formula of bringing into (4) and is entered
Row is solved；The value drawn after many minor sorts summation iteration is carried out is jack per line, i.e., only remaining capacitive compensation between wind power plant
Or inductive compensation, then mutual compensation can not be completed, it is necessary to introduce in corresponding wind power plant between the wind power plant in the wind farm group
The reactive-load compensation equipment (SVC) in portion carries out the self-compensating inside single wind power plant；
What SVC was represented is the reactive-load compensation equipment in single wind power plant, and each wind power plant has, when wind power plant is carried out two-by-two
After complete idle mutual compensation, one of wind power plant can be compensated completely, so this wind power plant need not just carry out idle benefit
Repay, and another wind power plant then needs to carry out the compensation calculation of next round, compensation rate is Δ Qj *, that is to say, that final purpose is to allow
Reactive-load compensation equipment action inside less single wind power plant, even if needing SVC in single wind power plant to compensate, also than before
The capacity that the SVC of non-compensation calculation is enabled is small, so as to reach the purpose of the present invention；
If the value Δ Q of self-compensating the need for trying to achievej *Less than the maximum reactive compensation capacity Q of reactive-load compensation equipmentsvcmax,
Unnecessary reactive capability then needed for the wind power plant is directly compensated with reactive-load compensation equipment；IfThe then wind power plant
Interior reactive-load compensation equipment can not meet the reactive requirement in corresponding wind power plant, it is desirable to reduce the double-fed blower fan inside the wind power plant
Active power output quantity, increase double-fed blower fan reactive power occur, so as to complete to the reactive power of wind farm group
Compensation.
The active and idle situation about being not quite similar of exerting oneself of each wind power plant in the present invention, so reactive power difference is complete
Just and to be required to directly enable the reactive-load compensation equipment inside wind power plant in the case of being all negative value.The application is for having idle
The blower fan of generating ability, double-fed blower fan has wider reactive power regulation nargin, and other types blower fan does not apply to the application, contained
The blower fan of permagnetic synchronous motor itself can not adjust reactive power.
The relevant information of each double-fed blower fan uploads to single wind power monitoring and controlling in the inventive method wind power plant
Place, calculates the idle output area of each double-fed blower fan, and then obtains the idle output area of each wind power plant, wind farm group work(
Scheduling reactive-load compensation instruction is issued to the work(of each wind power plant according to the idle output area of each wind power plant at rate monitoring and controlling
At rate monitoring and controlling, after compensation deals, by Reactive-power control instruct (self-compensating) be issued to each of corresponding wind power plant it is double
Blower fan or reactive power compensating apparatus are presented, every double-fed blower fan sends this and provides how many active and idle actions or enable wind
Reactive power compensating apparatus in electric field, corresponding single wind power monitoring and controlling is sent to by the result of the action transmission line
Place, is then sent to this compensation result at wind farm group power monitoring control at each wind power monitoring and controlling, is
Scheduling provides reference next time, realizes the closed loop feedback control of information.
Embodiment 1
The quantity of wind power plant m=5 in wind farm group described in the present embodiment, there is 33 1.5MW pair in each wind power plant
Present blower fan.
The reactive-load compensation method of wind farm group of the present embodiment based on the idle generating ability of double-fed blower fan realizes step such as
Under：
1) the Reactive-power control scope of separate unit double-fed blower fan is calculated：
Each double-fed wind that 1-1 is uploaded at single wind power monitoring and controlling according to each double-fed blower fan in wind power plant
The essential information of machine is quantitatively calculated the idle generating ability scope of double-fed blower fan：
Together decided on according to the power output of double-fed blower fan by stator power output and rotor power output：
Wherein PAlways、QAlwaysThe active power and reactive power exported at double-fed fan outlet, P are represented respectivelys、PrIt is respectively fixed
Sub- side and the active power of rotor-side output, Qs、QrThe reactive power that respectively stator side and rotor-side are exported；
According to the vector coordinate transform of double fed asynchronous machine, the three-phase electricity under the conditions of the three phase static that double feedback electric engine is inputted
Pressure and magnetic linkage are converted into two phase components under the d-q-0 axles under the conditions of two-phase, the active and reactive power of the stator side after conversion
It is output as：
Wherein UsFor the peak value of stator voltage, constant value is taken after reaching stabilization；Lm、LsRespectively between stator mutual inductance and from
Sense；iqr、idrRespectively electric current of the rotor on q, d axle；ω1For the synchronous rotary angular speed of stator；
(6), (7) formula are arranged：
The active power and the scope of reactive power sent due to the stator side of double feedback electric engine is by stator and rotor winding and turned
The current limit influence of sub- side transverter, but the maximum current I of rotor-side transverterrmaxPlay major limitation：
Formula (8) and formula (9) formula is brought into formula (10) to arrange:
Arrange the idle scope for trying to achieve stator side：
Wherein IrmaxRepresent the maximum current value of rotor-side transverter；
Because the active and reactive power that rotor-side is exported is to be directly connected to power network by net side transverter, it is active and
Idle exchange is also occurred on net side transverter, so setting the peak power of net side current transformer design as Scmax, then net side change
Flowing the reactive power capability scope of device itself can be calculated with formula (13)：
The idle scope of the net side transverter of solution can be obtained：
The active output of rotor-side and the active of net side transverter are output as in double fed asynchronous machine：
Pr=sPS, Pc=Pr (15)
Wherein PcThe active output of net side transverter is represented, s represents revolutional slip；
Wushu (15) is brought into formula (14) and can obtained：
Formula (12) and (16) are integrated to the limit model of the reactive power for the total output that can try to achieve separate unit double-fed blower fan
Enclose：
2) the reactive power distribution of wind farm group is determined：
2-1 sets the quantity of wind power plant in studied wind farm group as 5,1.5MW double-fed wind in each wind power plant
The quantity of machine is identical for double-fed blower fan number in 33, and each wind power plant；To the idle of all double-fed blower fans of single wind power plant
Power limit is summed, will all separate unit double-fed blower fan output reactive powers maximum summation, while by all separate unit double-feds
The minimum value summation of blower fan output reactive power, respectively obtains the maximum that the reactive power of single wind power plant is exerted oneself
16.27MVar and minimum value -16.27MVar, then the Reactive-power control limit of power of single wind power plant for [- 16.27MVar,
16.27MVar]；
Reactive-load compensation instruction is issued to each wind power plant of wind farm group at 2-2 wind farm group power monitoring controls, and should
Reactive-load compensation instructs QSchedulingFormula (2) is met,
QSingle game min≤QScheduling≤QSingle game max (2)
The numerical value substituted into step 2-1 is：-16.27MVar≤QScheduling≤ 16.27MVar, wherein given 5 wind power plants
Dispatch value is respectively Q1 scheduling=7.5MVar, Q2 scheduling=5MVar, Q3 scheduling=6.8MVar, Q4 scheduling=9MVar, Q5 scheduling=12MVar, 5
The dispatch command of individual wind power plant all meets (2) formula, and subscript represents wind power plant code name 1 to 5 respectively, is tried to achieve by formula (3) idle
Total reactive power value Q that compensating instruction is sent with single wind power plantSingle game is totalDifference DELTA Q, it is total that the single wind power plant is sent
Reactive power value QSingle game is totalDirectly obtained by wind farm group power detection control, it is total that the wind power plant of each in the present embodiment is sent
Reactive power is respectively Q1 single game is total=13MVar, Q2 single games are total=7MVar, Q3 single games are total=8MVar, Q4 single games are total=5MVar, Q5 single games are total=
4MVar, by judging that difference DELTA Q size is controlled compensation to the reactive power of wind farm group；
Δ Q=QScheduling-QSingle game is total(3),
The corresponding Δ Q tried to achieve from first wind power plant to the 5th wind power plant is respectively：-5.5MVar、-2MVar、-
1.2MVar、4MVar、8MVar。
If Δ Q ＞ 0, then it represents that the single wind power plant is idle to be occurred, and is insufficient to compensate for the reactive power needed for double-fed blower fan,
Need to carry out reactive-load compensation to the wind power plant, the nothing as needed for giving the wind power plant by the unnecessary reactive power compensation of other wind power plants
Work(power or enable reactive-load compensation equipment (SVC (static reactive power compensation equipment)) inside the wind power plant etc.；
If Δ Q ＜ 0, then it represents that the reactive power that single wind power plant is sent is except disclosure satisfy that idle work(inside the wind power plant
The compensation of rate demand is outer, and also unnecessary reactive power can compensate for giving other wind power plants；
Above-mentioned 1st wind power plant, the 2nd wind power plant and the 3rd wind power plant are negative, represent what these three wind power plants were sent
Reactive power is except disclosure satisfy that also unnecessary reactive power can be mended inside respective wind power plant in addition to the compensation of reactive power demand
Repay and give other wind power plants；4th wind power plant and the 5th wind power plant are just, to represent the idle generation of the two wind power plants, be not enough to
Reactive power needed for compensation double-fed blower fan to the wind power plant, it is necessary to carry out reactive-load compensation.
2-3 according to step 2-2 try to achieve all wind power plants in the wind farm group containing 5 wind power plants reactive-load compensation instruction with
The difference for total reactive power value that the corresponding single wind power plant is sent, the difference represents the 1st to the 5th wind power plant respectively
Reactive power compensation difference, difference is ranked up according to order from small to large, Δ Q is expressed as after sequence1=-
5.5MVar, Δ Q2=-2MVar, Δ Q3=-1.2MVar, Δ Q4=4MVar, Δ Q5=8MVar, it is all idle by what is sorted
Power back-off difference is added according to formula (4) head and the tail combination of two, obtains the value after reactive-load compensation：
ΔQj *=Δ Qi+ΔQm-i+1(4),
In formula,Represent that two wind power plant reactive powers compensate adding and Δ Q for differenceiRepresent i-th of wind after sequence
The reactive power spill-out of electric field, Δ Qm-i+1The reactive power spill-out of the m-i+1 wind power plant after sequence is represented, now j
=1,2,3；
Bring the idle difference after sequence into (4) formula and obtain 2.5MVar and 2MVar, because the number of wind power plant is odd number,
So the compensation difference not summed up participates in next minor sort, i.e., the numerical value for participating in sequence again is：2.5MVar、-
1.2MVar、2MVar；If two-by-two after wind-powered electricity generation field compensation plus and Δ Qj *≠ 0, then it represents that one of wind power plant is to another wind
Electric field does not complete complete compensation, then by the Δ Q being not zero tried to achievej *Value is carried out after size sequence again, continues to bring into
Formula (4) is solved, and 1.3MVar is solved to obtain again, and wherein 2MVar is not summed up, and sequence, the number now sorted are participated in again
It is worth for 1.3MVar, 2MVar, i.e., the value drawn after many minor sorts summation iteration is jack per line, i.e., only remaining between wind power plant to hold
Property compensation or inductive compensation, then can not complete mutual compensation, it is necessary to introduce corresponding wind between the wind power plant in the wind farm group
Reactive-load compensation equipment (SVC) inside electric field carries out the self-compensating inside single wind power plant；
By wind power plant is compensated mutually two-by-two for the first time, the 1st wind power plant and the 2nd wind power plant are absolute due to reactive power
Value is smaller, so be it often fully compensated, after the calculating of the second minor sort the 3rd wind power plant due to reactive power absolute value it is small so
It is fully compensated for, the reactive power compensation value of remaining two jack per lines is respectively the 4th wind power plant and the 5th wind power plant needs
The reactive power value of compensation, the offset of the 4th wind power plant is 2MVar, and the offset of the 5th wind power plant is 1.3MVar,
The wind power plant SVC (reactive-load compensation equipment) of double-fed blower fan containing 33 1.5MW maximum compensation capacity is
22.5MVar, above compensation result be all not above the maximums of SVC compensation rates, so the offset after calculating directly uses wind-powered electricity generation
SVC compensation in.Wind power plant 1 after compensation, wind power plant 2, wind power plant 3 is all it often fully compensated, so need not be corresponding
The SVC of wind power plant compensates action, and the offset that wind power plant 4 needs is 2MVar, and the offset that wind power plant 5 needs is
1.3MVar, is reduced, the compensation of single wind power plant compared to the compensation total amount needed before without the powerless control method of the present invention
Amount is also reduced.
The present invention does not address part and is applied to prior art.
Claims (2)
1. a kind of reactive-load compensation method of the wind farm group based on the idle generating ability of double-fed blower fan, it is characterised in that this method
Content is：According to the active power information and double feedback electric engine and the essential information of transverter of the output inside wind power plant, calculate
Go out the idle limit of separate unit double-fed blower fan, then each separate unit double-fed blower fan reactive power auxiliary service in each wind power plant is summed, drawn
The capacity limit of the reactive power regulation of single wind power plant, provides scope reference for the setting of dispatching of power netwoks value, calculates each
Idle limit range value in individual wind power plant, carries out the reactive power distribution of wind farm group on this basis；Obtain each wind
The offset of the reactive power of electric field, to offset carry out order sequence, is completed to respectively there is the idle of the wind power plant two-by-two of supply and demand
The mutual compensation of power, carries out successive ignition and is compensated mutually until that can not complete, and residue needs the part compensated using accordingly
Reactive-load compensation equipment inside wind power plant goes to complete reactive-load compensation, when power network needs a large amount of reactive powers, then reduces part double
The active output of blower fan is presented, double-fed blower fan is considered as reactive source and sends idle, needed for compensation power network.
2. the reactive-load compensation method of the wind farm group according to claim 1 based on the idle generating ability of double-fed blower fan, its
It is characterised by comprising the following steps that for this method：
1) the Reactive-power control scope of separate unit double-fed blower fan is calculated：
Obtained according to the stator and rotor sructure feature of double-fed blower fan and active and reactive power input-output characteristic according to formula (1)
The maximum Q of separate unit double-fed blower fan output reactive power in wind farm groupUnit maxWith the minimum value Q of output reactive powerUnit min, then
The reactive power Q of the output of wind farm group separate unit double-fed blower fan alwaysUnitLimit range be：QUnit min≤QUnit≤QUnit max, the pole
Limit scope is the Reactive-power control scope of separate unit double-fed blower fan；
In formula, LmAnd LsThe mutual inductance between double-fed fan stator and self-induction, U are represented respectivelysThe voltage of double-fed fan stator side is represented,
IrmaxRepresent the maximum current that double-fed fan rotor side transverter is allowed to flow through, PsRepresent the active of double-fed fan stator side output
Power, ω1Represent the rotor speed of double-fed blower fan, ScmaxRepresent the maximum capacity of double-fed blower fan net side transverter；S is revolutional slip；
2) the reactive power distribution of wind farm group is determined：
2-1 sets the quantity of wind power plant in studied wind farm group as m, m >=3, the number of double-fed blower fan in each wind power plant
Measure for double-fed blower fan number in n platforms, and each wind power plant it is identical；To the reactive power auxiliary service of all double-fed blower fans of single wind power plant
Summation, will all separate unit double-fed blower fan output reactive powers maximum summation, while by all separate unit double-fed blower fans export
The minimum value summation of reactive power, respectively obtains the maximum Q that the reactive power of single wind power plant is exerted oneselfSingle game maxAnd minimum value
QSingle game min, then the Reactive-power control limit of power of single wind power plant is [QSingle game min,QSingle game max]；
Reactive-load compensation instruction is issued to each wind power plant of wind farm group at 2-2 wind farm group power monitoring controls, and this is idle
Compensating instruction QSchedulingFormula (2) is met,
QSingle game min≤QScheduling≤QSingle game max(2),
Total reactive power value Q that reactive-load compensation instruction is sent with single wind power plant is tried to achieve by formula (3)Single game is totalDifference DELTA Q, institute
State total reactive power value Q that single wind power plant is sentSingle game is totalDirectly obtained by wind farm group power detection control, by judging
Difference DELTA Q size is controlled compensation to the reactive power of wind farm group；
Δ Q=QScheduling-QSingle game is total(3),
2-3 tries to achieve reactive-load compensation instruction and the phase of all wind power plants in the wind farm group containing m wind power plant according to step 2-2
The difference for total reactive power value that the single wind power plant answered is sent, the difference represents the 1st nothing to m-th of wind power plant respectively
Reactive power compensator difference, difference is ranked up according to size order, and Δ Q is expressed as after sequence1,ΔQ2,…,ΔQm, will sort
Good all reactive power compensation differences are added according to formula (4) head and the tail combination of two, obtain the value after reactive-load compensation：
ΔQj *=Δ Qi+ΔQm-i+1(4),
In formula,Represent that two wind power plant reactive powers compensate adding and Δ Q for differenceiRepresent i-th of wind power plant after sequence
Reactive power spill-out, Δ Qm-i+1The reactive power spill-out of the m-i+1 wind power plant after sequence is represented, now
When m is odd number, the compensation difference not summed up participates in next minor sort；
If two-by-two after wind-powered electricity generation field compensation plus and Δ Qj *≠ 0, then it represents that one of wind power plant is not complete to another wind power plant
Into complete compensation, then by the Δ Q being not zero tried to achievej *Value is carried out after size sequence again, is continued the formula of bringing into (4) and is asked
Solution；The value drawn after many minor sort summation iteration are carried out is jack per line, i.e., only remaining capacitive compensation or sense between wind power plant
Property compensation, then mutual compensation can not be completed between the wind power plant in the wind farm group, it is necessary to introduce inside corresponding wind power plant
Reactive-load compensation equipment (SVC) carries out the self-compensating inside single wind power plant；
If the value Δ Q of self-compensating the need for trying to achievej *Less than the maximum reactive compensation capacity Q of reactive-load compensation equipmentsvcmax, then should
Unnecessary reactive capability needed for wind power plant is directly compensated with reactive-load compensation equipment；IfThen in the wind power plant
Reactive-load compensation equipment can not meet the reactive requirement in corresponding wind power plant, it is desirable to reduce double-fed blower fan inside the wind power plant has
The output quantity of work(power, the reactive power of increase double-fed blower fan occurs, so as to complete the compensation to the reactive power of wind farm group.
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