CN103715700A - Reactive power control system and control method applicable to wind farm grid-connection point voltage control - Google Patents

Reactive power control system and control method applicable to wind farm grid-connection point voltage control Download PDF

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CN103715700A
CN103715700A CN201310703296.9A CN201310703296A CN103715700A CN 103715700 A CN103715700 A CN 103715700A CN 201310703296 A CN201310703296 A CN 201310703296A CN 103715700 A CN103715700 A CN 103715700A
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idle
energy turbine
turbine set
wind energy
reactive power
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CN103715700B (en
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姜达军
钱敏慧
赵大伟
张磊
陈宁
葛路明
罗芳
王湘艳
朱凌志
汪宁渤
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Jiangsu Electric Power Co Ltd
State Grid Gansu Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Jiangsu Electric Power Co Ltd
State Grid Gansu Electric Power Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]

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Abstract

The invention relates to a reactive power control system applicable to wind farm grid-connection point voltage control and a reactive power control method applicable to the wind farm grid-connection point voltage control. The system includes a scheduling system; the scheduling system is connected wind a wind farm AVC system; the wind farm AVC system is connected with a wind farm concentrated SVC, a measuring device and a fan SCADA system respectively; and the fan SCADA system is connected with fans in a wind farm. The control method comprises the following steps that: the sequence of reactive power output adjustment performed on the fans by an AVC system is determined according to the sensitivity of wind farm grid-connection point voltage; and the total number of reactive power controllable fans is determined according to whether the reactive power of each fan is controllable or not, such that the upper and lower limits of adjustable reactive power total quantity of the fans can be determined; and reactive power total quantity Qreg of the wind farm, which is required to be adjusted, can be determined, and the Qreg is distributed according to a fan-first and SVC-second reactive power distribution strategy. With the reactive power control system and method applicable to the wind farm grid-connection point voltage control of the invention, the defect of long control cycle of the AVC system in the wind farm can be eliminated, and fast response adjustment ability of the SVC can be given to full play.

Description

Be applicable to powerless control system and control method that wind farm grid-connected point voltage is controlled
Technical field:
The present invention relates to a kind of powerless control system and control method, more specifically relate to a kind of powerless control system and control method that wind farm grid-connected point voltage is controlled that be applicable to.
Background technology:
Under the pressure of energy crisis and environmental pollution, wind-force had obtained very swift and violent development as a kind of clean regenerative resource in generating in recent years.Continuous increase along with wind energy turbine set installed capacity, the safe and stable operation situation of grid-connected wind farms and access area power grid thereof receives publicity day by day, one of them importance is exactly that the change at random of wind power constitutes a threat to partial electric grid voltage stabilization, the grid-connected meeting of large-scale wind power causes voltage ripple of power network, and particularly the voltage fluctuation of wind farm grid-connected point is the most outstanding.For guaranteeing power network safety operation, existing wind energy turbine set national standard and corporate specification, explicitly call for wind energy turbine set must possess corresponding idle control ability.
The part wind energy turbine set newly putting into operation has been configured powerless control system, the safety-optimized control that it utilizes blower fan in wind energy turbine set and SVC device to complete wind energy turbine set voltage.The powerless control system structure that at present wind energy turbine set is used is basic identical, is all by gathering the information of wind turbine and SVC in wind field, the dispatch command issuing according to dispatching patcher, according to different allocation strategies to idle distribution the in wind energy turbine set.Can produce like this two problems, the one, each control procedure all needs to gather the information of blower fan and SVC, then calculates and issue control command, and communication delay causes control cycle long, and effect is controlled in impact; The 2nd, SVC at every turn can only be passive the instruction issuing of reception AVC system control, limited greatly the quick adjustment responding ability of SVC device to voltage, the 3rd, frequently the idle of blower fan regulated, affect the safe and stable operation of blower fan self.
Summary of the invention:
The object of this invention is to provide a kind of powerless control system and control method that wind farm grid-connected point voltage is controlled that be applicable to, technical scheme of the present invention overcomes the long shortcoming of existing wind energy turbine set AVC system control cycle, when utilizing the idle ability of sending of wind-powered electricity generation unit, give full play to the quick response regulation ability of SVC, stabilize the voltage fluctuation amplitude of wind farm grid-connected point, reduce the idle adjusting number of times of wind-powered electricity generation unit, only at SVC, regulate can not meet the demands after grid-connected point voltage is gone beyond the scope and again the idle reference value of blower fan and SVC is adjusted.
For achieving the above object, the present invention is by the following technical solutions: be a kind ofly applicable to the powerless control system that wind farm grid-connected point voltage is controlled, described system comprises dispatching patcher, described dispatching patcher connects wind energy turbine set automatic voltage control system, and described wind energy turbine set automatic voltage control system connects respectively wind energy turbine set and concentrates reactive power compensator, measurement mechanism and blower fan data acquisition and supervisor control; Described blower fan data acquisition is connected with the blower fan in wind energy turbine set with idle regulating power with supervisor control.
A kind of powerless control system that wind farm grid-connected point voltage is controlled that is applicable to provided by the invention, the voltage communication with dispatch instructions that the mutual described dispatching patcher of described wind energy turbine set automatic voltage control system and described dispatching patcher issues, needs described wind energy turbine set automatic voltage control system to send to grid-connected point voltage site reactive power and each blower fan reactive power information of described dispatching patcher wind energy turbine set according to scheduling;
Described wind energy turbine set automatic voltage control system and described measurement mechanism comprise that described measurement mechanism sends to the wind farm grid-connected point voltage of described wind energy turbine set automatic voltage control system and the information of reactive power alternately;
Described wind energy turbine set automatic voltage control system and described blower fan data acquisition and supervisor control comprise that described wind energy turbine set automatic voltage control system sends to the idle control command of described blower fan data acquisition and each controlled blower fan of supervisor control, described blower fan data acquisition and supervisor control to send to the running status of described wind energy turbine set automatic voltage control system wind turbine and the information of reactive power alternately;
Described wind energy turbine set automatic voltage control system and described wind energy turbine set concentrate reactive power compensator to comprise that alternately wind energy turbine set automatic voltage control system sends to wind energy turbine set to concentrate the idle control command of described reactive power compensator, described wind energy turbine set to concentrate reactive power compensator to send to the information of its running status of wind energy turbine set automatic voltage control system and reactive power;
Described measurement mechanism and described wind energy turbine set concentrate reactive power compensator to comprise that alternately measurement mechanism sends to described wind energy turbine set to concentrate the information of the wind farm grid-connected point voltage of reactive power compensator.
A kind of control method that is applicable to the powerless control system of wind farm grid-connected point voltage control provided by the invention, said method comprising the steps of:
(1) according to the idle sequence of size to wind farm grid-connected point voltage sensitivity of exerting oneself of wind turbine in wind energy turbine set, described wind energy turbine set automatic voltage control system regulates idle the exerting oneself of blower fan according to the descending order of sensitivity;
(2) determine the idle whether controlled of described wind turbine;
(3), according to the idle controllable state of the described definite wind turbine of described step (2), determine the idle controlled blower fan sum N of whole wind energy turbine set c, and then the bound of the adjustable idle total amount of definite wind energy turbine set inner blower;
(4) the wind farm grid-connected point target voltage U described dispatching patcher being issued refreal-time voltage U with wind farm grid-connected point meascompare, obtain voltage deviation value;
(5) determine the idle total amount Q that wind energy turbine set need to regulate reg, according to the idle total amount Q that after first described blower fan, wind energy turbine set concentrates the idle allocation strategy of reactive power compensator need to regulate wind energy turbine set regdistribute.
Another preferred a kind of control method that is applicable to the powerless control system of wind farm grid-connected point voltage control provided by the invention, determine that the process of described level of sensitivity is:
P-Q decomposition method in calculating according to trend, in P-Q decomposition method,
ΔQ=-B*ΔV (1)
Wherein, B is the imaginary part of wind farm grid-connected point and wind turbine node admittance matrix, the reactive power variable quantity that Δ Q is corresponding node, and the voltage variety that Δ V is corresponding node, changes above formula, obtains
ΔV=-B -1*ΔQ (2)
By determine-B -1in with and row corresponding to site bus in respect to each columns value of each blower fan node, the size of numerical value relatively, the node blower fan that corresponding numerical value is large preferentially carries out idle adjusting.
A preferred a kind of control method that is applicable to the powerless control system that wind farm grid-connected point voltage controls again provided by the invention, described step (2) if in the idle controlled idle control flag bit C that puts corresponding blower fan of described wind turbine flag=1; If described wind turbine is idle uncontrollable, put the idle control flag bit C of corresponding blower fan flag=0; There is following situation, judge that blower fan is uncontrollable, put C flag=0, otherwise put C flag=1;
Described blower fan itself sends fault alarm; Or
The communicating interrupt of described blower fan and blower fan data acquisition and supervisor control; Or
The idle instruction that described blower fan can not issue according to automatic voltage control system is controlled.
Another preferred a kind of control method that is applicable to the powerless control system of wind farm grid-connected point voltage control provided by the invention, in described step 3, determine that the bound process of the adjustable idle total amount of wind energy turbine set inner blower is:
The upper limit Q of the adjustable idle total amount of wind energy turbine set inner blower wc max=N c* Q wl max(3)
The lower limit Q of the adjustable idle total amount of wind energy turbine set inner blower wc min=N c* Q wl min(4)
In formula, Q wl minfor the idle lower limit of blower fan, Q wl maxthe idle upper limit for blower fan; Calculate again the idle total amount that idle uncontrollable blower fan sends:
Q wnc = ΣQ meas i - - - ( 5 )
In formula, for idle control flag bit C flag=0 blower fan current idle.
Another preferred a kind of control method that is applicable to the powerless control system of wind farm grid-connected point voltage control provided by the invention, in described step (4), voltage deviation value is:
ΔU=|U ref-U meas| (6)
Voltage deviation value is set to dead band U dead1thereby, avoid described wind energy turbine set automatic voltage control system frequently equipment to be regulated; If voltage deviation value Δ U < is U dead1, described wind energy turbine set automatic voltage control system no longer concentrates the idle reference of reactive power compensator again to adjust to the described blower fan in wind energy turbine set and wind energy turbine set; If voltage deviation value Δ U > is U dead1, described wind energy turbine set automatic voltage control system concentrates the idle reference of reactive power compensator again to adjust to the blower fan in described wind energy turbine set and wind energy turbine set.
Another preferred a kind of control method that is applicable to the powerless control system of wind farm grid-connected point voltage control provided by the invention, as described voltage deviation value Δ U > U dead1, by voltage and idle relation, calculate the reactive power amount that wind energy turbine set need to compensate:
ΔQ reg=K V-Q*ΔU (7)
In formula, Δ Q regfor the reactive power compensation amount that wind energy turbine set need to regulate, K v-Qfor grid-connected point voltage-idle sensitivity coefficient, according to on-site actual situations, adjust.
Another preferred a kind of control method that is applicable to the powerless control system of wind farm grid-connected point voltage control provided by the invention, the idle total amount Q that the idle uncontrollable blower fan that described step (5) is determined by described step (3) sends wncthe reactive power compensation amount Δ Q calculating with described step (4) reg, and definite wind energy turbine set idle total amount Q that need to regulate reg, the idle total amount Q that concentrates the idle allocation strategy of reactive power compensator need to regulate wind energy turbine set according to wind energy turbine set after first blower fan regdistribute;
Q reg=Q meas+ΔQ reg-Q wnc (8)
If Q wc min< Q reg< Q wc max, according to the definite blower fan adjustment order of described step (1), the idle reference of blower fan is adjusted;
Work as Q reg> 0, gets
n=[Q reg/Q wl max] (9)
Wherein, [] represents round numbers, before adjusting n Fans idle adjust into:
Q wi give=Q wl max(i=1…n) (10)
N+1 Fans idle adjust into:
Q wi give=Q reg–n*Q wl max(i=n+1) (11)
Idle the adjusting of remaining blower fan and SVC is 0;
Work as Q reg< 0, gets
n=[Q reg/Q wl min] (12)
Before adjusting n Fans idle adjust into:
Q wi give=Q wl min(i=1…n) (13)
N+1 Fans idle adjust into:
Q wi give=Q reg–n*Q wl min(i=n+1) (14)
Idle the adjusting of remaining blower fan and SVC is 0;
If Q reg> Q wc max, all controlled blower fans idle adjust into:
Q wi give=Q wl max(i=1…N c) (15)
Described wind energy turbine set is concentrated reactive power compensator idle adjust into:
Q svc give=Q reg–Q wc max (16)
If Q reg– Q wc max> Q svc max, described wind energy turbine set is concentrated reactive power compensator idle adjust into:
Q svc give=Q svc max (17)
If Q reg< Q wc min, all controlled blower fans idle adjust into:
Q wi give=Q wl min(i=1-N c) (18)
Described wind energy turbine set is concentrated reactive power compensator idle adjust into:
Q svc give=Q reg–Q wc min (19)
If Q reg– Q wc max< Q svc min, described wind energy turbine set is concentrated reactive power compensator idle adjust into:
Q svc give=Q svc min (20)
Wherein, Q svc maxfor the idle upper limit of SVC, Q svc minidle lower limit for SVC; Q wl min, Q wl max, Q svc minand Q svc maxaccording to the blower fan of on-the-spot actual motion and described wind energy turbine set, concentrate reactive power compensator to determine.
Another preferred a kind of control method that is applicable to the powerless control system of wind farm grid-connected point voltage control provided by the invention, in the idle setting value issuing at the described automatic voltage control system of reception, receive the wind farm grid-connected point target voltage U that described dispatching patcher issues refreal-time voltage U with wind farm grid-connected point meas, and compare, obtain voltage deviation value,
ΔU 1=|U ref-U meas| (21)
Set described wind energy turbine set and concentrate the voltage-regulation dead band U of reactive power compensator dead2if, voltage deviation value Δ U 1< U dead2, described wind energy turbine set concentrates the idle reference of reactive power compensator to be given as:
Q svc ref=Q svc give (22)
If voltage deviation value Δ U 1> U dead2, described wind energy turbine set concentrates the idle reference of reactive power compensator to be given as:
Q svc ref=(K p+K i/s)*(ΔU 1-K r*ΔQ)+Q svc give (23)
Wherein, K pproportionality coefficient for pi regulator; K iintegral coefficient for pi regulator; K rfor difference coefficient; Δ Q is the real-time idle regulated quantity of SVC.
Another preferred a kind of control method that is applicable to the powerless control system of wind farm grid-connected point voltage control provided by the invention, described voltage deviation value dead band U dead1perunit value be taken as 0.01, or carry out flexible according to on-the-spot actual requirement.
Another preferred a kind of control method that is applicable to the powerless control system of wind farm grid-connected point voltage control provided by the invention, described voltage-regulation dead band U dead2perunit value be taken as 0.003, or carry out flexible according to on-site actual situations.
With immediate prior art ratio, the invention provides technical scheme and there is following excellent effect
1, in technical scheme of the present invention, in AVC system and SVC control system, set respectively two voltage-regulation dead bands, give full play to the reactive voltage quick adjustment performance of SVC and the coordination performance to wind energy turbine set inner blower and SVC that AVC system is taken a panoramic view of the situation;
2,, in technical scheme of the present invention, grid-connected point voltage deviation surpasses U dead2and over U dead1time, SVC starts to regulate, and reduces the fluctuating range of grid-connected point voltage, thereby reduce grid-connected point voltage deviation, surpasses U dead1probability, avoid touching AVC system and regulate, reduce the idle adjusting action frequency of wind-powered electricity generation unit, be conducive to the stable operation of wind-powered electricity generation unit;
3,, in technical scheme of the present invention, grid-connected point voltage deviation surpasses U dead1time, AVC system starts to regulate, and makes full use of the idle regulating power of wind-powered electricity generation unit, the preferential wind-powered electricity generation unit of giving carries out without the distribution of work, when blower fan reactive capability is not enough, then SVC is carried out without the distribution of work, to SVC, stay adjusting allowance as much as possible to regulate in real time;
4, in technical scheme of the present invention, when carrying out without the distribution of work to blower fan, the size according to the idle adjusting of blower fan to the sensitivity of wind farm grid-connected point voltage, sequentially selects the adjusting of blower fan, can strengthen regulating effect and reduce adjusting number of times, also can reduce the line loss in wind energy turbine set;
5, in technical scheme of the present invention, SVC can directly by measuring component, record and the voltage of site regulates, and fast response time can regulate in real time to wind farm grid-connected point voltage fluctuation, compared to wind energy turbine set powerless control system before, real-time is stronger.
6, technical scheme of the present invention is that very crucial supporting role has been played in the management and running that wind energy turbine set can participate in electric power system better.
Accompanying drawing explanation
Fig. 1 is system configuration schematic diagram of the present invention;
Fig. 2 is SVC control principle schematic diagram in the present invention
Fig. 3 is method flow diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the invention will be described in further detail.
Embodiment 1:
As shown in Figure 1, the invention of this example is applicable to the powerless control system that wind farm grid-connected point voltage is controlled, described system comprises dispatching patcher, described dispatching patcher connects wind energy turbine set automatism voltage control (AVC) system, and described wind energy turbine set automatic voltage control system connects respectively the given improved wind energy turbine set of idle reference and concentrates reactive power compensator (SVC), measurement mechanism and blower fan data acquisition and monitor (SCADA) system of control; Described blower fan data acquisition is connected with the blower fan in wind energy turbine set with idle regulating power with monitoring (SCADA) system of control.By described wind energy turbine set AVC system, concentrate reactive power compensator (SVC) to carry out information communication respectively and instruction issues with dispatching patcher, measurement mechanism, blower fan SCADA system and wind energy turbine set, wind energy turbine set concentrates reactive power compensator (SVC) to go back the dispatch command of receiving scheduling system and the information of measurement mechanism collection is controlled in real time simultaneously.
The voltage communication with dispatch instructions that the mutual described dispatching patcher of described wind energy turbine set automatic voltage control system and described dispatching patcher issues, needs described wind energy turbine set automatic voltage control system to send to the information such as the grid-connected point voltage of described dispatching patcher wind energy turbine set site reactive power and each blower fan reactive power according to scheduling;
Described wind energy turbine set automatic voltage control system and described measurement mechanism comprise that described measurement mechanism sends to the wind farm grid-connected point voltage of described wind energy turbine set automatic voltage control system and the information of reactive power alternately;
Described wind energy turbine set automatic voltage control system and described blower fan data acquisition and supervisor control comprise that described wind energy turbine set automatic voltage control system sends to the idle control command of described blower fan data acquisition and each controlled blower fan of supervisor control, described blower fan data acquisition and supervisor control to send to the running status of described wind energy turbine set automatic voltage control system wind turbine and the information of reactive power alternately;
Described wind energy turbine set automatic voltage control system and described wind energy turbine set concentrate reactive power compensator to comprise that alternately wind energy turbine set automatic voltage control system sends to wind energy turbine set to concentrate the idle control command of described reactive power compensator, described wind energy turbine set to concentrate reactive power compensator to send to the information of its running status of wind energy turbine set automatic voltage control system and reactive power;
Described measurement mechanism and described wind energy turbine set concentrate reactive power compensator to comprise that alternately measurement mechanism sends to described wind energy turbine set to concentrate the information of the wind farm grid-connected point voltage of reactive power compensator.
As shown in Figure 2, improved SVC control principle drawing; Wherein, U refthe grid-connected point target magnitude of voltage issuing for dispatching patcher; U measmeasured value for grid-connected point voltage; U dead2voltage-regulation dead band for SVC controller; σ maxfor the idle increase governing speed of the SVC upper limit; σ minfor the idle minimizing governing speed of SVC lower limit; K pproportionality coefficient for pi regulator; K iintegral coefficient for pi regulator; K rfor difference coefficient; Δ Q is the real-time idle regulated quantity of SVC; Q svc givefor AVC system is handed down to the idle amount of adjusting of SVC; Q maxthe idle adjusting upper limit for SVC; Q minidle adjusting lower limit for SVC; Q refidle reference value for SVC;
The course of work that SVC control system obtains idle reference is:
The wind farm grid-connected point target voltage U that SVC controller receiving scheduling system issues refreal-time voltage U with wind farm grid-connected point meas, and compare, obtain voltage deviation value Δ U, if Δ U is at dead zone range U dead2in, the real-time idle regulated quantity of SVC is constant, and then the idle reference of SVC is given also can not change; If Δ U exceeds dead zone range U dead2, the real-time idle regulated quantity of SVC regulates according to the size of voltage deviation, and it is large that voltage deviation becomes, and the real-time idle adjusting quantitative change of SVC is large, and then the idle reference of SVC is given also can increase; Voltage deviation diminishes, and the real-time idle regulated quantity of SVC diminishes, and then the idle reference of SVC is given also can reduce.
As shown in Figure 3, the control flow chart of described AVC system; If SVC regulates in real time or can not control voltage deviation, make Δ U exceed dead zone range U dead1, AVC system starts to regulate, and concrete steps are:
Step 1: according to the idle size order of size to wind farm grid-connected point voltage sensitivity of exerting oneself of wind turbine in wind energy turbine set, determine the idle order of exerting oneself regulating of wind energy turbine set AVC system to blower fan, determine that the concrete grammar of level of sensitivity is:
Use for reference P-Q decomposition method in trend calculating, in P-Q decomposition method,
ΔQ=-B*ΔV (1)
Wherein, B is the imaginary part of wind farm grid-connected point and wind turbine node admittance matrix.Δ Q is the reactive power variable quantity of corresponding node, and the voltage variety that Δ V is corresponding node, changes above formula, obtains
ΔV=-B -1*ΔQ (2)
Need to obtain-B only -1in with and row corresponding to site bus in respect to each columns value of each blower fan node, the size of numerical value relatively, the node blower fan that corresponding numerical value is large preferentially carries out idle adjusting.
Step 2: determine the idle whether controlled of wind turbine, put the idle control flag bit C of corresponding blower fan if controlled flag=1, if uncontrollable, put the idle control flag bit C of corresponding blower fan flag=0.There is following situation, judge that blower fan is uncontrollable, put C flag=0, otherwise put C flag=1.
1. blower fan itself sends fault alarm;
2. the communicating interrupt of blower fan and blower fan SCADA system;
3. the idle instruction that blower fan can not issue according to AVC system is controlled.
Step 3: according to the idle controllable state of the determined wind turbine of step 2, determine the idle controlled blower fan sum N of whole wind energy turbine set cand then the bound of the adjustable idle total amount of definite wind energy turbine set inner blower,
The upper limit Q of the adjustable idle total amount of wind energy turbine set inner blower wc max=N c* Q wl max(3)
The lower limit Q of the adjustable idle total amount of wind energy turbine set inner blower wc min=N c* Q wl min(4)
In formula, Q wl minfor the idle lower limit of blower fan, Q wl maxthe idle upper limit for blower fan.Then calculate the idle total amount that idle uncontrollable blower fan sends,
Q wnc = &Sigma;Q meas i - - - ( 5 )
In formula,
Figure 2013107032969100002DEST_PATH_IMAGE004
for idle control flag bit C flag=0 blower fan current idle.
Step 4: the wind farm grid-connected point target voltage U that dispatching patcher is issued refreal-time voltage U with wind farm grid-connected point meascompare, obtain voltage deviation value,
ΔU=|U ref-U meas| (6)
Need to set dead band U to voltage deviation value dead1thereby, avoid AVC system frequently equipment to be regulated.If voltage deviation value Δ U < is U dead1, AVC system is no longer adjusted again to the blower fan in wind energy turbine set and the idle reference of SVC, if voltage deviation value Δ U > is U dead1, AVC system is adjusted again to the blower fan in wind energy turbine set and the idle reference of SVC.
Step 5: if voltage deviation value Δ U > is U dead1, by voltage and idle relation, calculate the reactive power amount that wind energy turbine set need to compensate,
ΔQ reg=K V-Q*ΔU (7)
In formula, Δ Q regfor the reactive power compensation amount that wind energy turbine set need to regulate, K v-Qfor grid-connected point voltage-idle sensitivity coefficient, according to on-site actual situations, adjust.
Step 6: the idle total amount Q that utilizes idle uncontrollable blower fan that step 3 calculates to send wncthe reactive power compensation amount Δ Q calculating with step 5 reg, calculate the idle total amount Q that wind energy turbine set need to regulate reg, according to the idle allocation strategy of SVC after first blower fan to Q regdistribute,
Q reg=Q meas+ΔQ reg-Q wnc (8)
If Q wc min< Q reg< Q wc max, according to the definite blower fan adjustment order of step 1, the idle reference of blower fan is adjusted.Work as Q reg> 0, gets
n=[Q reg/Q wl max] (9)
Wherein, [] represents round numbers, before adjusting n Fans idle adjust into:
Q wi give=Q wl max(i=1…n) (10)
N+1 Fans idle adjust into:
Q wi give=Q reg–n*Q wl max(i=n+1) (11)
Idle the adjusting of remaining blower fan and SVC is 0.
Work as Q reg< 0, gets
n=[Q reg/Q wl min] (12)
Before adjusting n Fans idle adjust into:
Q wi give=Q wl min(i=1…n) (13)
N+1 Fans idle adjust into:
Q wi give=Q reg–n*Q wl min(i=n+1) (14)
Idle the adjusting of remaining blower fan and SVC is 0.
If Q reg> Q wc max, all controlled blower fans idle adjust into:
Q wi give=Q wl max(i=1…N c) (15)
SVC idle adjust into:
Q svc give=Q reg–Q wc max(16)
If Q reg– Q wc max> Q svc max, SVC idle adjust into:
Q svc give=Q svc max (17)
If Q reg< Q wc min, all controlled blower fans idle adjust into:
Q wi give=Q wl min(i=1-N c) (18)
SVC idle adjust into:
Q svc give=Q reg–Q wc min (19)
If Q reg– Q wc max< Q svc min, SVC idle adjust into:
Q svc give=Q svc min (20)
Wherein, Q svc maxfor the idle upper limit of SVC, Q svc minidle lower limit for SVC.Q wl min, Q wl max, Q svc minand Q svc maxaccording to the blower fan of on-the-spot actual motion and SVC device, determine.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of this claim scope.

Claims (12)

1. one kind is applicable to the powerless control system that wind farm grid-connected point voltage is controlled, described system comprises dispatching patcher, it is characterized in that: described dispatching patcher connects wind energy turbine set automatic voltage control system, described wind energy turbine set automatic voltage control system connects respectively wind energy turbine set and concentrates reactive power compensator, measurement mechanism and blower fan data acquisition and supervisor control; Described blower fan data acquisition is connected with the blower fan in wind energy turbine set with idle regulating power with supervisor control.
2. a kind of powerless control system that wind farm grid-connected point voltage is controlled that is applicable to as claimed in claim 1, it is characterized in that: the voltage communication with dispatch instructions that the mutual described dispatching patcher of described wind energy turbine set automatic voltage control system and described dispatching patcher issues, needs described wind energy turbine set automatic voltage control system to send to the wind farm grid-connected point voltage of described dispatching patcher site reactive power and each blower fan reactive power information according to scheduling;
Described wind energy turbine set automatic voltage control system and described measurement mechanism comprise that described measurement mechanism sends to the wind farm grid-connected point voltage of described wind energy turbine set automatic voltage control system and the information of reactive power alternately;
Described wind energy turbine set automatic voltage control system and described blower fan data acquisition and supervisor control comprise that described wind energy turbine set automatic voltage control system sends to the idle control command of described blower fan data acquisition and each controlled blower fan of supervisor control, described blower fan data acquisition and supervisor control to send to the running status of described wind energy turbine set automatic voltage control system wind turbine and the information of reactive power alternately;
Described wind energy turbine set automatic voltage control system and described wind energy turbine set concentrate reactive power compensator to comprise that alternately wind energy turbine set automatic voltage control system sends to wind energy turbine set to concentrate the idle control command of described reactive power compensator, described wind energy turbine set to concentrate reactive power compensator to send to the information of its running status of wind energy turbine set automatic voltage control system and reactive power;
Described measurement mechanism and described wind energy turbine set concentrate reactive power compensator to comprise that alternately measurement mechanism sends to described wind energy turbine set to concentrate the information of the wind farm grid-connected point voltage of reactive power compensator.
3. a kind of control method that is applicable to the powerless control system that wind farm grid-connected point voltage controls as claimed in claim 1 or 2, is characterized in that: said method comprising the steps of:
(1) according to the idle sequence of size to wind farm grid-connected point voltage sensitivity of exerting oneself of wind turbine in wind energy turbine set, described wind energy turbine set automatic voltage control system regulates idle the exerting oneself of blower fan according to the descending order of sensitivity;
(2) determine the idle whether controlled of described wind turbine;
(3), according to the idle controllable state of the described definite wind turbine of described step (2), determine the idle controlled blower fan sum N of whole wind energy turbine set c, and then the bound of the adjustable idle total amount of definite wind energy turbine set inner blower;
(4) the wind farm grid-connected point target voltage U described dispatching patcher being issued refreal-time voltage U with wind farm grid-connected point meascompare, obtain voltage deviation value;
(5) determine the idle total amount Q that wind energy turbine set need to regulate reg, according to the idle total amount Q that after first described blower fan, wind energy turbine set concentrates the idle allocation strategy of reactive power compensator need to regulate wind energy turbine set regdistribute.
4. a kind of control method that is applicable to the powerless control system that wind farm grid-connected point voltage controls as claimed in claim 3, is characterized in that: the process of determining described level of sensitivity is:
P-Q decomposition method in calculating according to trend, in P-Q decomposition method,
ΔQ=-B*ΔV (1)
Wherein, B is the imaginary part of wind farm grid-connected point and wind turbine node admittance matrix, the reactive power variable quantity that Δ Q is corresponding node, and the voltage variety that Δ V is corresponding node, changes above formula, obtains
ΔV=-B -1*ΔQ (2)
By determine-B -1in with and row corresponding to site bus in respect to each columns value of each blower fan node, the size of numerical value relatively, the node blower fan that corresponding numerical value is large preferentially carries out idle adjusting.
5. a kind of control method that is applicable to the powerless control system that wind farm grid-connected point voltage controls as claimed in claim 4, is characterized in that: described step (2) if in the idle controlled idle control flag bit C that puts corresponding blower fan of described wind turbine flag=1; If described wind turbine is idle uncontrollable, put the idle control flag bit C of corresponding blower fan flag=0; There is following situation, judge that blower fan is uncontrollable, put C flag=0, otherwise put C flag=1;
Described blower fan itself sends fault alarm; Or
The communicating interrupt of described blower fan and blower fan data acquisition and supervisor control; Or
The idle instruction that described blower fan can not issue according to automatic voltage control system is controlled.
6. a kind of control method that is applicable to the powerless control system that wind farm grid-connected point voltage controls as claimed in claim 5, is characterized in that: the bound process of determining the adjustable idle total amount of wind energy turbine set inner blower in described step 3 is:
The upper limit Q of the adjustable idle total amount of wind energy turbine set inner blower wc max=N c* Q wl max(3)
The lower limit Q of the adjustable idle total amount of wind energy turbine set inner blower wc min=N c* Q wl min(4)
In formula, Q wl minfor the idle lower limit of blower fan, Q wl maxthe idle upper limit for blower fan; Calculate again the idle total amount that idle uncontrollable blower fan sends:
Figure 2013107032969100001DEST_PATH_IMAGE001
In formula,
Figure 2013107032969100001DEST_PATH_IMAGE002
for idle control flag bit C flag=0 blower fan current idle.
7. a kind of control method that is applicable to the powerless control system that wind farm grid-connected point voltage controls as claimed in claim 6, is characterized in that: in described step (4), voltage deviation value is:
ΔU=|U ref-U meas| (6)
Voltage deviation value is set to dead band U dead1thereby, avoid described wind energy turbine set automatic voltage control system frequently equipment to be regulated; If voltage deviation value Δ U < is U dead1, described wind energy turbine set automatic voltage control system no longer concentrates the idle reference of reactive power compensator again to adjust to the described blower fan in wind energy turbine set and wind energy turbine set; If voltage deviation value Δ U > is U dead1, described wind energy turbine set automatic voltage control system concentrates the idle reference of reactive power compensator again to adjust to the blower fan in described wind energy turbine set and wind energy turbine set.
8. a kind of control method that is applicable to the powerless control system of wind farm grid-connected point voltage control as claimed in claim 7, is characterized in that: as described voltage deviation value Δ U > U dead1, by voltage and idle relation, calculate the reactive power amount that wind energy turbine set need to compensate:
ΔQ reg=K V-Q*ΔU (7)
In formula, Δ Q regfor the reactive power compensation amount that wind energy turbine set need to regulate, K v-Qfor grid-connected point voltage-idle sensitivity coefficient, according to on-site actual situations, adjust.
9. a kind of control method that is applicable to the powerless control system of wind farm grid-connected point voltage control as claimed in claim 8, is characterized in that: the idle total amount Q that the idle uncontrollable blower fan that described step (5) is determined by described step (3) sends wncthe reactive power compensation amount Δ Q calculating with described step (4) reg, and definite wind energy turbine set idle total amount Q that need to regulate reg, the idle total amount Q that concentrates the idle allocation strategy of reactive power compensator need to regulate wind energy turbine set according to wind energy turbine set after first blower fan regdistribute;
Q reg=Q meas+ΔQ reg-Q wnc (8)
If Q wc min< Q reg< Q wc max, according to the definite blower fan adjustment order of described step (1), the idle reference of blower fan is adjusted;
Work as Q reg> 0, gets
n=[Q reg/Q wl max] (9)
Wherein, [] represents round numbers, before adjusting n Fans idle adjust into:
Q wi give=Q wl max(i=1…n) (10)
N+1 Fans idle adjust into:
Q wi give=Q reg–n*Q wl max(i=n+1) (11)
Idle the adjusting of remaining blower fan and SVC is 0;
Work as Q reg< 0, gets
n=[Q reg/Q wl min] (12)
Before adjusting n Fans idle adjust into:
Q wi give=Q wl min(i=1…n) (13)
N+1 Fans idle adjust into,
Q wi give=Q reg–n*Q wl min(i=n+1) (14)
Idle the adjusting of remaining blower fan and SVC is 0;
If Q reg> Q wc max, all controlled blower fans idle adjust into:
Q wi give=Q wl max(i=1…N c) (15)
Described wind energy turbine set is concentrated reactive power compensator idle adjust into:
Q svc give=Q reg–Q wc max (16)
If Q reg– Q wc max> Q svc max, described wind energy turbine set is concentrated reactive power compensator idle adjust into:
Q svc give=Q svc max (17)
If Q reg< Q wc min, all controlled blower fans idle adjust into:
Q wi give=Q wl min(i=1-N c) (18)
Described wind energy turbine set is concentrated reactive power compensator idle adjust into:
Q svc give=Q reg–Q wc min (19)
If Q reg– Q wc max< Q svc min, described wind energy turbine set is concentrated reactive power compensator idle adjust into:
Q svc give=Q svc min (20)
Wherein, Q svc maxfor the idle upper limit of SVC, Q svc minidle lower limit for SVC; Q wl min, Q wl max, Q svc minand Q svc maxaccording to the blower fan of on-the-spot actual motion and described wind energy turbine set, concentrate reactive power compensator to determine.
10. a kind of control method that is applicable to the powerless control system that wind farm grid-connected point voltage controls as claimed in claim 9, it is characterized in that: in the idle setting value issuing at the described automatic voltage control system of reception, receive the wind farm grid-connected point target voltage U that described dispatching patcher issues refreal-time voltage U with wind farm grid-connected point meas, and compare, obtain voltage deviation value,
ΔU 1=|U ref-U meas| (21)
Set described wind energy turbine set and concentrate the voltage-regulation dead band U of reactive power compensator dead2if, voltage deviation value Δ U 1< U dead2, described wind energy turbine set concentrates the idle reference of reactive power compensator to be given as:
Q svc ref=Q svc give (22)
If voltage deviation value Δ U 1> U dead2, described wind energy turbine set concentrates the idle reference of reactive power compensator to be given as:
Q svc ref=(K p+K i/s)*(ΔU 1-K r*ΔQ)+Q svc give (23)
Wherein, K pproportionality coefficient for pi regulator; K iintegral coefficient for pi regulator; K rfor difference coefficient; Δ Q is the real-time idle regulated quantity of SVC.
11. a kind of control methods that are applicable to the powerless control system that wind farm grid-connected point voltage controls as claimed in claim 7 or 8, is characterized in that: described voltage deviation value dead band U dead1perunit value be taken as 0.01, or carry out flexible according to on-the-spot actual requirement.
12. a kind of control methods that are applicable to the powerless control system of wind farm grid-connected point voltage control as claimed in claim 10, is characterized in that: described voltage-regulation dead band U dead2perunit value be taken as 0.003, or carry out flexible according to on-site actual situations.
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