CN204089197U - The system that wind power plant reactive voltage controls - Google Patents
The system that wind power plant reactive voltage controls Download PDFInfo
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- CN204089197U CN204089197U CN201420105221.0U CN201420105221U CN204089197U CN 204089197 U CN204089197 U CN 204089197U CN 201420105221 U CN201420105221 U CN 201420105221U CN 204089197 U CN204089197 U CN 204089197U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model is applicable to power domain, provide the system that a kind of wind power plant reactive voltage controls, described system comprises multiple sub-controller and is arranged at the central controller of booster stations, each grid branch arranges at least one sub-controller, and each sub-controller and described central controller communicate to connect; Wherein, described central controller, changes according to wind energy turbine set internal network parameter and external network reactive load the reactive compensation power Q that the points of common connection change in voltage caused calculates each grid branch
zL-Ref1, and under send instructions to the sub-controller of correspondence; Described sub-controller, receives described instruction and is dispensed to each blower fan, and it is Q that each blower fan described distributes the reactive compensation power that the central controller that obtains issues
k_Ref1.The system that the utility model provides, can to fluctuate the points of common connection change in voltage caused and the problem of wind energy turbine set internal network being carried out to reactive power compensation to wind farm wind velocity.
Description
Technical field
The utility model belongs to power domain, particularly relates to the system that a kind of wind power plant reactive voltage controls.
Background technology
Along with the continuous growth of China's installed capacity of wind-driven power, wind energy turbine set is idle, and control has become problem anxious to be resolved, a lot of wind field has been had to occur wind field access power system reactive power control problem at present, Baicheng, Jilin wind field outlet busbar voltage shakiness causes whole wind field to excise, and then cause instantaneous busbar voltage overvoltage thus puncture substation transformer, the prosperous horse in Gansu several times large-scale blower fan off-grid is also that line voltage instability causes.
In general, as shown in Figure 1, blower fan 1 output voltage is 690V, is elevated to 35KV by transformer 2 for the blower fan of wind energy turbine set, transformer, booster stations control centre electrical layout, be connected with other blower fans on this branch line, access 220kV electrical network 5 eventually through booster stations transformer 3.Points of common connection 4 be whole wind field to external electrical network points of common connection, impedance 6 represents line impedance.
In order to the points of common connection voltage 4 of constant wind electric field, often configure the reactive power compensator of certain capacity as SVC, SVG etc., but which increase construction and the operation cost of wind energy turbine set.Current Wind turbines (double-fed and direct-driving type) has mostly possessed certain reactive power compensation planning, but does not all enable, and still runs in the mode of unity power factor or constant power factor.If make blower fan group participate in reactive power/voltage control, greatly can increase the control ability of wind power plant reactive voltage, even can reduce the capacity of reactive power compensator, be a kind of reactive power/voltage control mode the most good at present.
Indivedual wind energy turbine set exemplarily engineering, has been equipped with blower fan group reactive power/voltage control (AVC) controlling functions, but has still there are some shortcomings:
1) the blower fan kind in general in wind energy turbine set is not single, and the manufacturer of such as blower fan is different, or identical manufacturer, but the model of blower fan is different.Especially for the blower fan of multiple different manufacturers, because its external interface is different, management gets up to bother very much, often will be equipped with the supervisory control system of multiple producer in wind energy turbine set control room, independent mutually.Make the data of wind energy turbine set be difficult to carry out data interaction with upper level control centre, only can realize the isolated reactive power/voltage control to local wind energy turbine set, and the unified of the regional reactive voltage that can not add regulates.
2) the reactive voltage governing speed of existing wind energy turbine set slowly, is generally the regulation and control of level frequency second.Existing scheme is generally by increasing AVC(automatism voltage control at the booster stations of wind energy turbine set) module realizes, AVC module is by communicating with the Scada system of different manufacturers, gather each blower fan information, and idle instruction is issued by each producer Scada system.This scheme not only adds approach and the transfer number of times of information gathering and instruction issuing, and the transmitting-receiving of key message and instruction all processes with general information frame, transmission processing can not be optimized, this frequency just causing whole AVC Closed control is very low, is all generally that even the longer time just can complete once command renewal in several seconds.And there is time variation due to wind speed, the feature of randomness, so its generated output is also instant change, this is fluctuation with regard to causing the voltage of wind energy turbine set points of common connection, and that is existing reactive voltage regulation technology can not control wind energy turbine set public electric wire net tie point voltage accurately.
Utility model content
The object of the utility model embodiment is the system providing a kind of wind power plant reactive voltage to control, and being intended to solve existing wind farm reactive voltage control method cannot carry out reactive power compensation to the fluctuate points of common connection change in voltage that causes of wind farm wind velocity and wind energy turbine set internal network not carried out to the problem that cannot compensate.
The utility model embodiment realizes like this, the system that a kind of wind power plant reactive voltage controls, the booster stations that described wind energy turbine set comprises multiple grid branch, is connected with each grid branch respectively, each grid branch described comprises multiple blower fan, and described booster stations pass through points of common connection output voltage to external network; Described system comprises multiple sub-controller and is arranged at the central controller of booster stations, and each grid branch arranges at least one sub-controller, and each sub-controller and described central controller communicate to connect; Wherein,
Described central controller, changes according to wind energy turbine set internal network parameter and external network reactive load the reactive compensation power Q that the points of common connection change in voltage caused calculates each grid branch
zL-Ref1, and under send instructions to the sub-controller of correspondence;
Described sub-controller, receives described instruction and is dispensed to each blower fan, and it is Q that each blower fan described distributes the reactive compensation power obtained
k_Ref1.
Further, described central controller comprises interconnective first computing module and the first distribution module, described first computing module, calculates wind energy turbine set internal network parameter and external network reactive load and changes the idle output summation Q that the points of common connection change in voltage that causes causes
ref1; Described first distribution module is according to described idle output summation Q
ref1distribute the reactive compensation power Q obtaining each grid branch
zL-Ref1.
Further, described sub-controller comprises the second distribution module be connected with described first distribution module, according to the reactive compensation power Q of each grid branch described
zL-Ref1distribute the reactive compensation power Q obtaining every Fans of this grid branch
k-Ref1.
Further, described sub-controller also comprises interconnective second computing module, the 3rd computing module and the 3rd distribution module, and the second computing module calculates the reactive compensation power Q of place grid branch according to the fluctuate points of common connection change in voltage that causes of wind farm wind velocity
zL-Ref2; 3rd computing module is according to the reactive compensation power Q of place grid branch
zL-Ref2calculate the reactive compensation power Q of each blower fan of place grid branch
k_Ref2; 3rd distribution module calculates the reactive compensation power Q that place each blower fan of grid branch needs to send
k_Ref=Q
k_Ref1+ Q
k_Ref2, and be issued to each blower fan.
Further, described sub-controller also comprises the acquisition module communicated to connect with central controller, gathers the blower fan information of place grid branch, and is be uploaded to central controller after default standard data format by described blower fan convert information.
The utility model embodiment adds new network equipment sub-controller and central controller, by central controller, reactive power compensation is carried out to the points of common connection change in voltage that wind energy turbine set internal network impedance variation and external network impedance variation cause, by sub-controller, reactive compensation power is calculated to the fluctuate points of common connection change in voltage that causes of wind farm wind velocity.The utility model embodiment provides a kind of new wind farm network layout type, can follow the tracks of the change of generated output, carry out reactive voltage adjustment fast, and wind energy turbine set points of common connection voltage is accurately controlled.In addition, the utility model embodiment, by transforming existing wind energy turbine set, also realizes different manufacturers, and the blower fan of different model carries out unifying reactive power/voltage control, convenient mutual with higher level control centre, simplifies wind field monitoring system.Further, the utility model embodiment solves wind power plant reactive voltage and regulates frequency problem slowly, realizes points of common connection voltage and controls more accurately.
Accompanying drawing explanation
Fig. 1 is the structure chart of wind energy turbine set in prior art;
Fig. 2 is the structure chart of the system of the wind power plant reactive voltage control that the utility model embodiment one provides;
Fig. 3 is the simplified structure diagram of the system of the wind power plant reactive voltage control that the utility model embodiment one provides;
Fig. 4 is the structure chart of the central controller of the system of the wind power plant reactive voltage control that the utility model embodiment one provides;
Fig. 5 is the structure chart of the sub-controller of the system of the wind power plant reactive voltage control that the utility model embodiment one provides;
Fig. 6 is the relation model figure of wind energy turbine set and bulk power grid in the system of the wind power plant reactive voltage control that the utility model embodiment one provides;
Fig. 7 is the equivalent-circuit model of system blower to points of common connection of the wind power plant reactive voltage control that the utility model embodiment one provides;
Fig. 8 is system blower another equivalent-circuit model to points of common connection of the wind power plant reactive voltage control that the utility model embodiment one provides;
Fig. 9 is the another equivalent-circuit model of system blower to points of common connection of the wind power plant reactive voltage control that the utility model embodiment one provides;
Figure 10 is the another equivalent-circuit model of system blower to points of common connection of the wind power plant reactive voltage control that the utility model embodiment one provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
embodiment one
The utility model embodiment one proposes the system that a kind of wind power plant reactive voltage controls.As shown in Figure 2, the booster stations 30 that the wind energy turbine set of the utility model embodiment one comprises multiple grid branch, is connected with each grid branch respectively, each grid branch described comprises multiple blower fan 10, and described booster stations 30 pass through points of common connection 40 output voltage to external network; The system of the utility model embodiment comprises multiple sub-controller 70 and is arranged at the central controller 80 of booster stations 30, and each grid branch arranges at least one sub-controller 70, and each sub-controller 70 communicates to connect with central controller 80.
The system of the utility model embodiment one can be reduced to Fig. 3 shownschematically system, in each grid branch, in First blower fan, installing one sub-controller 70(is not limited thereto, also can often Fans or number Fans be unit configuration sub-controller 70), can adjust according to the actual requirements, install central controller 80 at booster stations 30.
In the utility model embodiment one, central controller 80 is for collecting all blower fan information of each sub-controller 70 transmission and adding up; The reactive compensation power Q that points of common connection 40 change in voltage caused calculates each grid branch is changed according to wind energy turbine set internal network parameter and external network reactive load
zL-Ref1, and issue reactive compensation power Q
zL-Ref1instruction to corresponding sub-controller 70, be distributed to each blower fan of place grid branch by the sub-controller 70 of correspondence.As shown in Figure 4, central controller 80 comprises interconnective first computing module 81 and the first distribution module 82:
First computing module 81, calculates wind energy turbine set internal network parameter and external network reactive load and changes the idle output summation Q that the points of common connection change in voltage that causes causes
ref1;
First distribution module 82, according to described idle output summation Q
ref1distribute the reactive compensation power Q obtaining each grid branch
zL-Ref1.
In the utility model embodiment one, sub-controller 70 for gathering the blower fan information of place grid branch, and is uploaded to central controller 80; Receive the reactive compensation power Q of each grid branch that central controller 80 issues
zL-Ref1instruction, in conjunction with COMPREHENSIVE CALCULATING such as this grid branch each blower fan 10 start and stop state, grid branch impedance parameter, local transformer parameter, fan capacities, obtain the idle power output Q of every Fans 10 of this grid branch
k_Ref1, and perform with the blower fan 10 that high priority communication frames is distributed to place grid branch fast; And collect the crucial running status of each blower fan of this grid branch 10 with high priority communication frames, the reactive compensation power Q of the points of common connection 40 change in voltage calculating place grid branch caused that fluctuates according to wind farm wind velocity for this sub-controller 70
zL-Ref2, namely carry out the use of AVC control algolithm.As shown in Figure 5, sub-controller 70 comprises the second distribution module 71 be connected with the first distribution module 82, interconnective second computing module 72, the 3rd computing module 73 and the 3rd distribution module 74, the acquisition module 75 communicated to connect with central controller 80.
Second distribution module 71, for the reactive compensation power Q according to each grid branch described
zL-Ref1distribute the reactive compensation power Q obtaining every Fans of this grid branch
k-Ref1.
Second computing module 72, the points of common connection change in voltage caused for fluctuating according to wind farm wind velocity calculates the reactive compensation power Q of place grid branch
zL-Ref2;
3rd computing module 73, for the reactive compensation power Q according to place grid branch
zL-Ref2calculate the reactive compensation power Q of each blower fan 10 of place grid branch
k_Ref2;
3rd distribution module 74, for calculating the reactive compensation power Q that grid branch each blower fan 10 in place needs to send
k_Ref=Q
k_Ref1+ Q
k_Ref2, and be issued to each blower fan 10.
Described blower fan convert information for gathering the blower fan information of place grid branch, and is be uploaded to central controller 80 after default standard data format by acquisition module 75, thus can the blower fan 10 of compatible different model different manufacturers.
In order to reactive power/voltage control, need the circuit model setting up whole wind energy turbine set, divide according to internetwork connection mode, comprise external network and internal network two parts.
For external network, wind energy turbine set and contacting of bulk power grid can be reduced to illustraton of model 6, and the voltage of wind energy turbine set points of common connection 40 and the voltage relationship of electrical network rear end can be drawn by electric power system common-used formula.
V
g=V
L+(P
extR
ext+Q
extX
ext)/V
L
（1）
Wherein V
gfor the magnitude of voltage of points of common connection 40, V
lfor electrical network far-end magnitude of voltage, R
extfor power network line internal resistance value, X
extfor power network line reactance value, P
extfor the active power value that the load of electrical network far-end absorbs, Q
extfor the reactive power value that the load of electrical network far-end absorbs.
For internal network, each Fans 10 arrives the equivalent-circuit model of points of common connection 40 as shown in Figure 7, sets up kth Fans W
kto the equivalent circuit diagram of points of common connection, due to transformer T
kto blower fan W
kapart from short, its line impedance can be ignored, transformer T
kinternal resistance is less, also ignores.If by transformer T
k, line impedance then obtains the equivalent electric circuit of Fig. 8, due to transformer T after carrying out corresponding no-load voltage ratio conversion
kexcitatory reactance X
kmusually much larger than its leakage reactance, therefore can do the equivalent electric circuit that further Approximate Equivalent obtains Fig. 9, as can be seen from Figure 9, system model is divided into three parts:
Blower fan W
kwith transformer T
kexcitatory reactance X
kmformation Part I in parallel, X
kmabsorbing reactive power is Q
km=V
wk/ jX
km, wherein V
kmfor kth Fans W
kthe grid-connected point voltage value in this locality, X
kmfor kth Fans W
ktransformer T
kexcitatory reactance.This part is idle must be compensated by blower fan, otherwise is provided by electrical network.
The excitatory reactance X of electrical network and booster stations transformer
mformation Part II, in like manner X in parallel
mabsorbing reactive power is Q
m=V
g/ jX
m, wherein V
gfor points of common connection voltage.This part must have all blower fans jointly to provide, otherwise is provided by electrical network.
Part III comprises line resistance R
lkwith line reactance X
lk, kth Fans W
ktransformer T
kprimary leakage reactance X
k σ 1with secondary reactance X
k σ 2, the former secondary leakage reactance X of booster stations transformer
σ 1with secondary reactance X
σ 2, we are by blower fan W
ktransformer T
kmerge with the former secondary leakage reactance of booster stations transformer, as shown in Figure 10, Z
k=R
lk+ j (X
lk+ X
k σ+ X
σ), wherein X
k σ=X
k σ 1+ X
k σ 2, X
σ=X
σ 1+ X
σ 2.Line impedance part is all differences because of the construction position difference of blower fan.This part can cause fan outlet voltage and points of common connection voltage difference.
In order to realize controlling more accurately points of common connection 40 voltage, the utility model embodiment one have employed the strategy that multiple regulative mode combines.Divide according to Reactive-power control speed, comprise fixed compensation (reactive power compensation of internal network impedance), compensate (due to far-end line voltage V at a slow speed
lfluctuation and the external network impedance reactive power compensation carried out), compensate (the reactive power compensation part caused due to active power of wind power field Rapid Variable Design) fast.
According to the circuit model set up, cause the factor of points of common connection 40 change in voltage can be divided into following three parts above:
External voltage disturbance (because network load variation causes), this part pace of change slowly and can not estimate, can by (the Q in formula 1
extx
ext)/V
lcompensate, belong to compensated part at a slow speed, be generally level regulations speed second.
For the idle Q that the exciting impedance of booster stations transformer absorbs
mand the idle Q that each blower fan 10 transformer excitation impedance absorbs
km, relevant to the busbar voltage added on the transformer, because in actual motion, voltage fluctuation is not too large, can be similar to and think that this part reactive power is constant, therefore this part belongs to fixed compensation part.
Fluctuation due to wind speed causes the power output of blower fan to be also fluctuation, so, according to (P in formula 1
extr
ext)/V
l, this will cause the fluctuation of points of common connection 40 voltage, and due to wind speed change rapidity, will cause the rapid fluctuations of points of common connection 40 voltage, second, level Reactive-power control did not catch up with the pace of change of voltage yet.So governing speed (being generally tens ms) must be promoted.Therefore this part belongs to quick compensated part.
Above-mentioned reactive power compensation is specifically undertaken by central controller 80 and sub-controller 70.
The calculating of the reactive power compensation of fixing reactive power compensation and reactive power compensation is at a slow speed responsible for by central controller 80, and the idle output summation of all blower fans of whole wind energy turbine set is:
Q
Ref=Q
ins+Q
m+∑Q
km
Wherein Q
insfor the reactive compensation power that control centre issues, ∑ Q
kmfor the summation of the reactive compensation power that the excitatory reactance of all blower fan 10 transformers absorbs, central controller 80 carries out distribution Q in proportion according to the idle value that utilizes of each grid branch
ref, central controller 80 also can distribute reactive compensation power Q according to the weighted value of each grid branch preset
ref, obtain the reactive compensation power Q of each grid branch
zL-Ref1.
Sub-controller 70 is responsible for the calculating of the reactive power of Quick reactive-load compensation, in order to make up due to the voltage difference that meritorious fluctuation causes in formula 1, sub-controller 70 calculates according to the meritorious output instantaneous value of this grid branch the reactive compensation power Q that this grid branch needs real-Time Compensation
zL-Ref2, and share to every Fans 10, obtain the reactive compensation power Q of each blower fan
k_Ref2, then obtained the reactive compensation power Q of every Fans of this grid branch according to the COMPREHENSIVE CALCULATING such as start and stop state, grid branch impedance parameter, local transformer parameter, fan capacity of each blower fan of this grid branch by sub-controller 70
k-Ref1.
Can obtain the reactive compensation power of each blower fan 10 thus, sub-controller 70 receives the reactive compensation power Q that central controller 80 distributes
zL-Ref1, and share and be designated as Q to every Fans 10 of this grid branch
k_Ref1, so every Fans 10 needs the reactive power sent to be Q
k_Ref=Q
k_Ref1+ Q
k_Ref2.Time noticeable, Q
k_Ref1with Q
k_Ref2renewal frequency be different, Q
k_Ref1be mainly derived from central controller 80, speed is slow; Q
k_Ref2in order to make up power fluctuation, speed is fast.
The utility model embodiment one provides network topology and the reactive power/voltage control strategy of the control of a kind of brand-new wind power plant reactive voltage: fixed compensation is idle, at a slow speed compensating reactive power, quick compensating reactive power.Set up sub-controller and central controller completes above-mentioned reactive power/voltage control.The system of the utility model embodiment one can follow the tracks of the change of generated output, carries out reactive voltage adjustment fast, and wind energy turbine set points of common connection voltage is accurately controlled.In addition, the utility model embodiment one is by transforming existing wind energy turbine set, and the sub-controller of each grid branch can compatible different manufacturers, dissimilar fan interface; The fan monitoring data of this grid branch are normalized arrangement, make the interface between each sub-controller and central controller be standardized, facilitate dilatation and the maintenance upgrade of system.Further, the blower fan quantity faced by the sub-controller of each grid branch is relatively less, the time delay that the communication of minimizing brings, and increases substantially control bandwidth, for Quick reactive-load compensation strategy provides necessary condition.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (5)
1. the system of a wind power plant reactive voltage control, the booster stations that described wind energy turbine set comprises multiple grid branch, is connected with each grid branch respectively, each grid branch described comprises multiple blower fan, and described booster stations pass through points of common connection output voltage to external network; It is characterized in that, described system comprises multiple sub-controller and is arranged at the central controller of booster stations, and each grid branch arranges at least one sub-controller, and each sub-controller and described central controller communicate to connect; Wherein,
Described central controller, changes according to wind energy turbine set internal network parameter and external network reactive load the reactive compensation power Q that the points of common connection change in voltage caused calculates each grid branch
zL-Ref1, and under send instructions to the sub-controller of correspondence;
Described sub-controller, receives described instruction and is dispensed to each blower fan, and it is Q that each blower fan described distributes the reactive compensation power obtained
k_Ref1.
2. the system as claimed in claim 1, it is characterized in that, described central controller comprises interconnective first computing module and the first distribution module, described first computing module, calculates wind energy turbine set internal network parameter and external network reactive load and changes the idle output summation Q that the points of common connection change in voltage that causes causes
ref1; Described first distribution module is according to described idle output summation Q
ref1distribute the reactive compensation power Q obtaining each grid branch
zL-Ref1.
3. system as claimed in claim 2, it is characterized in that, described sub-controller comprises the second distribution module be connected with described first distribution module, according to the reactive compensation power Q of each grid branch described
zL-Ref1distribute the reactive compensation power Q obtaining every Fans of this grid branch
k-Ref1.
4. system as claimed any one in claims 1 to 3, it is characterized in that, described sub-controller also comprises interconnective second computing module, the 3rd computing module and the 3rd distribution module, and the second computing module calculates the reactive compensation power Q of place grid branch according to the fluctuate points of common connection change in voltage that causes of wind farm wind velocity
zL-Ref2; 3rd computing module is according to the reactive compensation power Q of place grid branch
zL-Ref2calculate the reactive compensation power Q of each blower fan of place grid branch
k_Ref2; 3rd distribution module calculates the reactive compensation power Q that place each blower fan of grid branch needs to send
k_Ref=Q
k_Ref1+ Q
k_Ref2, and be issued to each blower fan.
5. the system as claimed in claim 1, it is characterized in that, described sub-controller also comprises the acquisition module communicated to connect with central controller, gathers the blower fan information of place grid branch, and is be uploaded to central controller after default standard data format by described blower fan convert information.
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| CN201420105221.0U CN204089197U (en) | 2014-03-07 | 2014-03-07 | The system that wind power plant reactive voltage controls |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103855715A (en) * | 2014-03-07 | 2014-06-11 | 深圳市长昊机电有限公司 | Method and system for wind farm reactive voltage control |
| CN109995040A (en) * | 2017-12-29 | 2019-07-09 | 国网冀北电力有限公司张家口供电公司 | The method for solving network voltage and temporarily dropping is dispatched under a kind of micro-capacitance sensor by energy storage |
| CN111602307A (en) * | 2018-01-10 | 2020-08-28 | 通用电气公司 | System and method for optimizing reactive power generation of wind farm |
-
2014
- 2014-03-07 CN CN201420105221.0U patent/CN204089197U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103855715A (en) * | 2014-03-07 | 2014-06-11 | 深圳市长昊机电有限公司 | Method and system for wind farm reactive voltage control |
| CN109995040A (en) * | 2017-12-29 | 2019-07-09 | 国网冀北电力有限公司张家口供电公司 | The method for solving network voltage and temporarily dropping is dispatched under a kind of micro-capacitance sensor by energy storage |
| CN111602307A (en) * | 2018-01-10 | 2020-08-28 | 通用电气公司 | System and method for optimizing reactive power generation of wind farm |
| CN111602307B (en) * | 2018-01-10 | 2023-08-18 | 通用电气公司 | System and method for optimizing reactive power generation of wind farm |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 |