CN106786743A - Device and method for regulating the reactive power of a wind turbine - Google Patents
Device and method for regulating the reactive power of a wind turbine Download PDFInfo
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- CN106786743A CN106786743A CN201611220459.8A CN201611220459A CN106786743A CN 106786743 A CN106786743 A CN 106786743A CN 201611220459 A CN201611220459 A CN 201611220459A CN 106786743 A CN106786743 A CN 106786743A
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Classifications
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- H02J3/386—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
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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
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
An apparatus and method for regulating reactive power of a wind turbine are provided. The device comprises: the receiving unit is used for receiving the required reactive power of the wind driven generator; a first regulation closed-loop unit that calculates and outputs a calibration reactive current for calibrating a deviation of the reactive current based on the received required reactive power and the reactive power of the wind power generator measured from a metering device of the wind power generator; and the second regulation closed-loop unit is used for calculating a reference reactive current for regulating the reactive current of a grid-connected side current loop of the converter of the wind driven generator based on the received required reactive power, the output calibration reactive current and the reactive current collected from the converter of the wind driven generator, and outputting the calculated reference reactive current to the converter of the wind driven generator so as to regulate the reactive current collected from the converter of the wind driven generator. The device and the method can quickly and accurately adjust the reactive power of the wind driven generator.
Description
Technical field
The present invention relates to technical field of wind power, more specifically to a kind of reactive power regulation side of use two close cycles
Formula is come the apparatus and method that adjust the reactive power of wind-driven generator.
Background technology
In recent years, with the development of new energy development project, wind power industry is greatly developed.Wind-driven generator is
Wind energy is converted into mechanical energy, then the power equipment for converting mechanical energy into electric energy.Because wind-power electricity generation does not have fuel problem,
Radiation or air pollution will not be produced, so that as the generation mode being becoming increasingly popular and support.
In the technology of wind-power electricity generation, grid requirements wind power plant will possess reactive power adjustment device, using wind-force
Generator provides reactive power and can reduce input of the wind field to reactive power adjustment device, therefore reactive power regulation turns into wind
Power generator necessary functions.Wind-driven generator (for example, direct-driving type wind power generation machine) is connected to the grid by full power convertor, and
And by full power convertor output reactive power.
For example, referring to Fig. 1, Fig. 1 is the connection diagram that wind-driven generator is connected to the grid.The internal part of wind-driven generator
It is connected to the grid via transformer including current transformer and metering device, and wind-driven generator.The metering device of wind-driven generator with
The point of transformer connection is the grid entry point of wind-driven generator.Generally, the mode of the reactive power of measurement wind-driven generator may include
Reactive power is measured from current transformer and from metering device measurement reactive power both modes.The measurement point of both metering systems
Can be as shown in Figure 1, i.e. current transformer wattless power measurement point and metering device wattless power measurement point, wherein, metering device is idle
Power measurement point is wind-driven generator grid entry point.
At present, the general reactive power regulation control of wind-driven generator is to realize regulation control by single closed loop.For example,
Fig. 2 is the block diagram of the device of the reactive power for adjusting wind-driven generator of prior art.
Reference picture 2, the device 200 of the reactive power for adjusting wind-driven generator of prior art includes receiving unit
201st, measuring unit 202, arithmetic element 203, PID controller 204.Receiving unit 201 can receive the demand of wind-driven generator without
Work(power Qcmd.Measuring unit 202 can be from current transformer wattless power measurement point or metering device wattless power measurement point measurement wind
The current reactive power Q of power generatorsmp.Arithmetic element 203 can be by from the demand reactive power Q of wind-driven generatorcmdSubtract wind
The current reactive power Q of power generatorsmpAnd difference (that is, the Q for obtainingcmd-Qsmp) it is sent to PID controller 204.PID controller
204 can be by (Qcmd-Qsmp) as input, and maximum reactive current Iq_Max and wind-driven generator based on wind-driven generator are most
Small reactive current Iq_Min, calculates the reference reactive current Iq_ of the reactive current for adjusting current transformer and net side electric current loop
Ref, and the reference reactive current Iq_ref that will calculate exported to the current transformer of wind-driven generator to adjust wind-driven generator
Current transformer and net side electric current loop reactive current.
When the current transformer 210 of wind-driven generator is received with reference to reactive current Iq_ref, by the change of wind-driven generator
The reactive current of stream device output is regulated so that the reactive power Q of the wind-driven generator measured from wattless power measurement pointsmp
Also it is conditioned.Device 200 can adjust operation by successive ignition, until the current reactive power of wind-driven generator measured
QsmpWith demand reactive power QcmdConsistent (that is, Qcmd-Qsmp=0), regulation operation is completed.
The device 200 of the reactive power for adjusting wind-driven generator according to prior art, measuring unit 202 it is idle
Power measurement point can be current transformer wattless power measurement point or metering device wattless power measurement point as shown in Figure 1.However,
The device 200 of the reactive power for adjusting wind-driven generator according to prior art, no matter which measuring unit 202 measure from
Point is measured, all existing defects.
The reactive power of wind-driven generator is measured from current transformer wattless power measurement point in the measuring unit 202 of device 200
In the case of, because current transformer reactive power measurement point is not wind-driven generator grid entry point, centre is separated with filter capacitor and distribution becomes
Depressor, having differences property of hardware, part reactive power is difficult to accurate estimation, and the reactive power of calculating can have error, therefore,
There is error in the regulation of wind-driven generator reactive power.
The idle work(of wind-driven generator is measured from metering device wattless power measurement point in the measuring unit 202 of device 200
In the case of rate, because the universal response speed of metering device is slow, the response speed of blower fan reactive power regulation is slow.
Accordingly, it would be desirable to the apparatus and method of a kind of not only quick but also accurately regulation wind-driven generator reactive power.
The content of the invention
It is an object of the invention at least solve disadvantages mentioned above, and provide at following advantages.
It is an aspect of the invention to provide a kind of apparatus and method for adjusting the reactive power of wind-driven generator, institute
The reactive current that stating apparatus and method can be adjusted by quick response adjusts the reactive current that control closed loop and accurate calibration are adjusted
Deviation calibration closed loop, carrys out reactive power that is not only quick but also accurately adjusting wind-driven generator.
According to an aspect of the present invention, there is provided a kind of device for adjusting the reactive power of wind-driven generator, including：
Receiving unit, receives the demand reactive power of wind-driven generator；First regulation closed-loop element, based on the idle work(of demand for receiving
The reactive power of the wind-driven generator that rate and the metering device from wind-driven generator are measured, calculates and exports for idle electricity
The calibration reactive current that the deviation of stream is calibrated；Second regulation closed-loop element, based on the demand reactive power, output that receive
Calibration reactive current and the reactive current that collects of the current transformer from wind-driven generator, calculate for adjusting wind-driven generator
The reference reactive current of the reactive current of current transformer and net side electric current loop, and wind-force is arrived in the reference reactive current output that will be calculated
The current transformer of generator, with the reactive current that the current transformer adjusted from wind-driven generator is collected.
The nothing of the wind-driven generator that the metering device when the demand reactive power for receiving and from wind-driven generator is measured
When work(power is inconsistent, the first regulation closed-loop element and the second executable iterative operation of regulation closed-loop element are with exporting change respectively
Calibration reactive current and change reference reactive current so that the wind-power electricity generation measured from the metering device of wind-driven generator
The reactive power of machine is consistent with the demand reactive power for receiving.
When the wind-driven generator measured from the metering device of wind-driven generator reactive power and the demand for receiving without
When work(power is consistent, the first regulation closed-loop element and the second regulation closed-loop element can complete iterative operation, and export stabilization respectively
Calibration reactive current and stabilization reference reactive current.
When the demand reactive power for receiving changes, the second regulation closed-loop element can be by using the first regulation closed loop list
Unit is previously completed the calibration reactive current of the stabilization exported during iterative operation to perform iterative operation, so that from wind-driven generator
The reactive power of the wind-driven generator that metering device is measured is consistent with the demand reactive power after changing.
First regulation closed-loop element may include：Measuring unit, wind-driven generator is measured from the metering device of wind-driven generator
Reactive power；First arithmetic element, subtracts the reactive power measured to calculate by the demand reactive power that will be received
Reactive power difference；First PID controller, the maximum reactive current based on the reactive power difference, wind-driven generator for calculating
With the minimum reactive current of wind-driven generator, the calibration reactive current is calculated and exported.
Second regulation closed-loop element may include：Collecting unit, reactive current is gathered from the current transformer of wind-driven generator；Second
Arithmetic element, demand is calculated by the demand reactive power that will receive divided by the grid-connected power network rated voltage of wind-driven generator
Reactive current；3rd arithmetic element, by the demand reactive current that will calculate plus the calibration reactive current of output, then subtracts and adopts
The reactive current of collection calculates reactive current difference；Second PID controller, based on reactive current difference, the wind-force hair for calculating
The maximum reactive current of motor and the minimum reactive current of wind-driven generator, calculate the reference reactive current, and by the ginseng
Examine reactive current output to the current transformer of wind-driven generator.
The reactive current collected from the current transformer of wind-driven generator when collecting unit is calculated with the second arithmetic element
Demand reactive current plus the first PID controller output it is calibration reactive current and inconsistent when, second adjust closed-loop element
Executable iterative operation so that the current transformer of the reference reactive current output that the second PID controller will change to wind-driven generator
To adjust the reactive current that collecting unit is collected from the current transformer of wind-driven generator, until the nothing that the 3rd arithmetic element is calculated
Untill work(current differential is equal to 0.
When the need that the reactive current that collecting unit is collected from the current transformer of wind-driven generator is calculated with the second arithmetic element
Ask reactive current plus the first PID controller output calibration reactive current with it is consistent when, second adjust closed-loop element can be complete
Into iterative operation, and the exportable stabilization of the second PID controller reference reactive current.
When measuring unit from the metering device of the wind-driven generator current reactive power measured and the demand for receiving without
When work(power is inconsistent, the first executable iterative operation of regulation closed-loop element so that the calibration of the first PID controller exporting change
Reactive current, to promote the second regulation closed-loop element to be iterated operation, until the reactive power that the first arithmetic element is calculated
Untill difference is equal to 0.
When measuring unit from the metering device of the wind-driven generator reactive power measured and the idle work(of demand for receiving
When rate is consistent, the first regulation closed-loop element can complete iterative operation, and the calibration of the exportable stabilization of the first PID controller is idle
Electric current.
When the demand reactive power for receiving changes, the second arithmetic element can be by using the idle work(of demand after change
Rate recalculates demand reactive current, and the 3rd arithmetic element can be by using the demand reactive current for recalculating and first
The calibration reactive current of the stabilization of PID controller output calculates reactive current difference, and the second regulation closed-loop element can hold
Row iteration is operated so that the second PID controller exports to the current transformer of wind-driven generator to adjust the reference reactive current of change
The reactive current that section collecting unit is collected from the current transformer of wind-driven generator, until the idle electricity that the 3rd arithmetic element is calculated
Untill stream difference is equal to 0, so as to the reactive power measured from the metering device of wind-driven generator and demand after change are idle
Power is consistent.
According to another aspect of the present invention, there is provided a kind of method for adjusting the reactive power of wind-driven generator, wrap
Include：(A) the demand reactive power of wind-driven generator is received；(B) based on the demand reactive power that receives and from wind-driven generator
The reactive power of wind-driven generator measured of metering device, calculate and export and calibrated for the deviation to reactive current
Calibration reactive current；(C) based on the demand reactive power, the calibration reactive current of output for receiving and from wind-driven generator
The reactive current that current transformer is collected, calculates reactive current for the current transformer that adjusts wind-driven generator and net side electric current loop
With reference to reactive current, and the reference reactive current output that will be calculated is sent out with adjusting to the current transformer of wind-driven generator from wind-force
The reactive current that the current transformer of motor is collected.
Methods described may also include：Metering device when the demand reactive power for receiving and from wind-driven generator is measured
Wind-driven generator reactive power it is inconsistent when, be iteratively performed step (B) and step (C) with respectively exporting change calibration
Reactive current and the reference reactive current of change, so that the nothing of the wind-driven generator measured from the metering device of wind-driven generator
Work(power is consistent with the demand reactive power for receiving.
Methods described may also include：When the reactive power of the wind-driven generator measured from the metering device of wind-driven generator
When consistent with the demand reactive power for receiving, the iteration of step (B) and step (C) is completed, and exports the calibration of stabilization respectively
The reference reactive current of reactive current and stabilization.
Methods described may also include：When the demand reactive power that receives changes, by using being previously completed step (B)
Iteration when the calibration reactive current of stabilization that exports be iteratively performed step (C), so as to be filled from the metering of wind-driven generator
The reactive power for putting the wind-driven generator measured is consistent with the demand reactive power for receiving.
Step (B) may include：The reactive power of wind-driven generator is measured from the metering device of wind-driven generator；By that will connect
The demand reactive power for receiving subtracts the reactive power measured to calculate reactive power difference；By the first PID controller base
In the maximum reactive current and the minimum reactive current of wind-driven generator of the reactive power difference, wind-driven generator for calculating, meter
Calculate the calibration reactive current；Export the calibration reactive current.
Step (C) may include：Reactive current is gathered from the current transformer of wind-driven generator；It is idle by the demand that will be received
Power calculates demand reactive current divided by the grid-connected power network rated voltage of wind-driven generator；By the idle electricity of demand that will be calculated
Stream then subtracts the reactive current of collection and calculates reactive current difference plus the calibration reactive current of output；By the 2nd PID
Controller is by based on reactive current difference, the maximum reactive current of wind-driven generator and the minimum of wind-driven generator for calculating
Reactive current, calculates the reference reactive current；By the current transformer of reference reactive current output to wind-driven generator.
Methods described may also include：When the reactive current that is collected from the current transformer of wind-driven generator and the demand for calculating without
Work(electric current plus output it is calibration reactive current and inconsistent when, be iteratively performed step (C) with by the second PID controller
The reference reactive current output of change is collected to the current transformer of wind-driven generator with the current transformer adjusted from wind-driven generator
Reactive current, untill the reactive current difference that calculates is equal to 0；When the nothing collected from the current transformer of wind-driven generator
Work(electric current with calculate demand reactive current plus output it is calibration reactive current and consistent when, step (C) iteration completion,
And the reference reactive current of stabilization is exported by the second PID controller.
Methods described may also include：When the current reactive power measured from the metering device of wind-driven generator with receive
Demand reactive power it is inconsistent when, step (B) is iteratively performed to be iteratively performed step (B) with by the first PID control
The calibration reactive current of device exporting change, to promote to be iteratively performed step (C), until the reactive power difference for calculating is equal to
Untill 0；When the reactive power measured from the metering device of wind-driven generator is consistent with the demand reactive power for receiving, step
Suddenly the iteration of (B) is completed, and the calibration reactive current of stabilization is exported by the first PID controller.
Methods described may also include：When the demand reactive power that receives changes, by using the demand after change without
Work(power recalculates demand reactive current, by using the demand reactive current and the first PID controller that recalculate defeated
The calibration reactive current of the stabilization for going out calculates reactive current difference, and is iteratively performed step (C) and causes by the 2nd PID
Controller exports to the current transformer of wind-driven generator to adjust the current transformer from wind-driven generator the reference reactive current of change
The reactive current for collecting, untill the reactive current difference that calculates is equal to 0, so as to from the metering device of wind-driven generator
The reactive power measured is consistent with the demand reactive power after changing.
Apparatus and method for adjusting the reactive power of wind-driven generator of the invention, can be adjusted by quick response
The reactive current regulation control closed loop of section and the reactive current deviation calibration closed loop of accurate calibration regulation are not only quick but also smart to realize
The effect of the reactive power of wind-driven generator, and described device really are adjusted without installing electric current additional in wind-driven generator grid entry point
Sensor, the response speed requirement to metering device is low, without increasing cost to improve the response speed of metering device, to hard
Part parameter no requirement (NR), highly versatile.
Brief description of the drawings
By with reference to accompanying drawing, in being described from below embodiment, these and/or other side of the present invention and advantage will become
Must understand, and it is more readily appreciated that wherein：
Fig. 1 is the connection diagram that wind-driven generator is connected to the grid；
Fig. 2 is the block diagram of the device of the reactive power for adjusting wind-driven generator of prior art；
Fig. 3 is the frame of the device of the reactive power for adjusting wind-driven generator of exemplary embodiment of the invention
Figure；
Fig. 4 is the method for the reactive power for adjusting wind-driven generator for showing exemplary embodiment of the invention
Flow chart.
In the accompanying drawings, identical label represents identical element, feature and structure all the time.
Specific embodiment
Following description referring to the drawings is provided to help the implementation of the invention to being limited by claim and its equivalent
The comprehensive understanding of example.Including various specific details to help understand, but these details are considered only as being exemplary.Therefore, originally
Field skilled artisan will realize that without departing from the scope and spirit of the present invention, can be to reality described herein
Example is applied to make various changes and modifications.Additionally, for clarity and brevity, omitting the description to known function and structure.
The present invention proposes the dress of the reactive power that wind-driven generator is adjusted using the reactive power regulative mode of two close cycles
Put and method.Here, two close cycles refer to reactive current regulation control closed loop and reactive current deviation calibration closed loop.Reactive current
The wind that deviation calibration closed loop to adjust reactive current regulation control closed loop by using the reactive power measured from metering device
The reactive power of power generator is calibrated, and reaches the effect of the accurately reactive power of regulation wind-driven generator.Due to filtering
Capacitance parameter is fixed, and line voltage robustness is stronger, and the reactive power of distribution transformer is smaller, so reactive power reaches
Without reactive current deviation calibration ring closure in certain hour after accurate, reactive current is only needed to adjust control ring closure just
The effect of the accurately reactive power of regulation wind-driven generator can be reached.Reactive current regulation control closed loop is by directly adjusting
The reactive current of current transformer adjusts the reactive power of wind-driven generator, reaches the reactive power for rapidly adjusting wind-driven generator
Effect.Therefore, idle work(that is not only quick but also accurately adjusting wind-driven generator can be reached using above-mentioned double circle structure
The effect of rate.
Fig. 3 is the frame of the device of the reactive power for adjusting wind-driven generator of exemplary embodiment of the invention
Figure.
Reference picture 3, the device of the reactive power for adjusting wind-driven generator of exemplary embodiment of the invention
300 (hreinafter referred to as reactive power adjustment devices 300) are connected with wind-driven generator 310.
Reactive power adjustment device 300 may include that the regulation regulation of closed-loop element 302 and second of receiving unit 301, first is closed
Ring element 303.Here, the first regulation closed-loop element 302 is equivalent to reactive current deviation calibration closed loop, the second regulation closed-loop element
303 equivalent to reactive current regulation control closed loop.
Specifically, receiving unit 301 can wind-driven generator demand reactive power Qcmd。
First regulation closed-loop element 302 can be based on the demand reactive power Q for receivingcmdWith the metering from wind-driven generator
The reactive power Q of the wind-driven generator that measurement device goes outsmp, calculate and export what is calibrated for the deviation to reactive current
Calibration reactive current Iq_offset.
Second regulation closed-loop element 303 can be based on the demand reactive power Q for receivingcmd, output calibration reactive current
The reactive current Iq that Iq_offset and the current transformer from wind-driven generator are collected, calculates for adjusting wind-driven generator 310
Current transformer 311 and the reactive current of net side electric current loop reference reactive current Iq_ref, and the idle electricity of reference that will be calculated
Stream Iq_ref outputs are collected to the current transformer 311 of wind-driven generator 310 with the current transformer 311 adjusted from wind-driven generator 310
Reactive current Iq.
Exemplary embodiment of the invention, the first regulation closed-loop element 302 may include measuring unit 302-1, first
Arithmetic element 302-2 and the first PID controller (proportional-integral derivative controller) 302-3.Measuring unit 302-1 can be from wind-force
The metering device 312 of generator 310 measures the reactive power Q of wind-driven generator 310smp.First arithmetic element 302-2 can pass through
The demand reactive power Q that will be receivedcmdSubtract the reactive power Q measuredsmpTo calculate reactive power difference (Qcmd-Qsmp)。
First PID controller can be based on the reactive power difference (Q for calculatingcmd-Qsmp), the maximum reactive current Iq_ of wind-driven generator
The minimum reactive current Iq_Min of Max and wind-driven generator, calculates and exports what is calibrated for the deviation to reactive current
Calibration reactive current Iq_offset.
Second regulation closed-loop element 302 may include collecting unit 303-1, the second arithmetic element 303-2, the 3rd arithmetic element
303-3 and the second PID controller 303-4.Collecting unit 303-1 can gather idle electricity from the current transformer 311 of wind-driven generator 310
Stream Iq.Second arithmetic element 303-2 can be by the demand reactive power Q that will receivecmdIt is grid-connected divided by wind-driven generator 300
Power network rated voltage E calculates demand reactive current Iq_cmd, i.e.3rd arithmetic element 303-3 leads to
The demand reactive current Iq_cmd that will be calculated is crossed plus the calibration reactive current Iq_offset for exporting, then subtracts the idle of collection
Electric current Iq calculates reactive current difference (Iq_cmd+Iq_offset-Iq).Second PID controller 303-4 can be based on calculating
Reactive current difference (Iq_cmd+Iq_offset-Iq), the maximum reactive current Iq_Max and wind-power electricity generation of wind-driven generator
The minimum reactive current Iq_Min of machine, calculates current transformer 311 and net side electric current loop the nothing for adjusting wind-driven generator 310
The reference reactive current Iq_ref of work(electric current, and this is arrived the unsteady flow of wind-driven generator 310 with reference to reactive current Iq_ref outputs
Device 311.
Below, the work that will be described in detail the reactive power adjustment device 300 of exemplary embodiment of the invention is former
Reason.
Aiming at for reactive power adjustment device 300 adjusts the reactive power at the grid entry point of wind-driven generator 310
QsmpIt is the demand reactive power Q of the wind-driven generator received with receiving unit 301cmdUnanimously.That is, reactive power adjustment device
300 aim at makes Qcmd-Qsmp=0.
When the demand reactive power Q that receiving unit 301 is receivedcmdWith measuring unit 302-1 from wind-driven generator 310
The reactive power Q of the wind-driven generator 310 that metering device 312 is measuredsmpWhen inconsistent, the first regulation closed-loop element 302 and the
Two regulation closed-loop elements 303 perform iterative operation with the calibration reactive current Iq_offset of exporting change respectively and the ginseng of change
Reactive current Iq_ref is examined, so that the wind-driven generator 310 measured from the metering device 312 of wind-driven generator 310 is idle
Power QsmpQ consistent with the demand reactive power for receivingcmd。
Specifically, the demand reactive power Q that receiving unit 301 is receivedcmdWith measuring unit 302-1 from wind-power electricity generation
The reactive power Q of the wind-driven generator 310 that the metering device 312 of machine 310 is measuredsmpWhen inconsistent, the first regulation closed-loop element
302 the first arithmetic element 302-2 calculates reactive power difference (Qcmd-Qsmp), a PID of the first regulation closed-loop element 302
Controller 302-3 is by reactive power difference (Qcmd-Qsmp) as input, and the maximum reactive current based on wind-driven generator 310
The minimum reactive current Iq_Min of Iq_Max and wind-driven generator 310, calculates calibration reactive current Iq_offset, and will calculate
The calibration reactive current Iq_offset outputs for going out adjust closed-loop element 303 to second.Additionally, the second regulation regulation closed-loop element
303 collecting unit 303-1 gathers reactive current Iq from the current transformer 311 of wind-driven generator 310, and the second regulation regulation is closed
Second arithmetic element 303-2 of ring element 303 is by demand reactive power QcmdIt is demand reactive current Iq_cmd to convert.
Second regulation closed-loop element 303 is obtaining calibration reactive current Iq_offset, demand reactive current Iq_cmd and nothing
, it is necessary to be iterated regulation after work(electric current Iq, the reactive current that will be collected from the current transformer 311 of wind-driven generator 310
Iq be adjusted to the demand reactive current Iq_cmd for calculating plus output calibration reactive current Iq_offset's and (Iq_cmd+
Iq_offset it is) consistent.That is, the second regulation closed-loop element 303 can be idle by the reference of successive ignition ground exporting change
Electric current Iq_ref adjusts current transformer 311 and net side electric current loop the reactive current of wind-driven generator 310, until Iq_cmd+
Untill Iq_offset-Iq=0.When the reactive current Iq collected from the current transformer 311 of wind-driven generator 310 and the need for calculating
Ask reactive current Iq_cmd plus output calibration reactive current Iq_offset it is consistent with (Iq_cmd+Iq_offset) when,
Second regulation closed-loop element 303 completes iterative operation, and exports the reference reactive current Iq_ref of stabilization.
Now, because current transformer 311 and net side electric current loop the reactive current of wind-driven generator 310 is conditioned, wind-force
The reactive power of generator 310 is also adjusted therewith, therefore measuring unit 302-1 is surveyed from the metering device 312 of wind-driven generator 310
The reactive power Q of the wind-driven generator 310 for measuringsmpAlso change.
If the wind-driven generator 310 that measuring unit 302-1 is measured from the metering device 312 of wind-driven generator 310
Reactive power QsmpWith the demand reactive power Q for receivingcmdUnanimously, then the regulation operation of reactive power adjustment device 300
Complete.
If the wind-driven generator 310 that measuring unit 302-1 is measured from the metering device 312 of wind-driven generator 310
Reactive power QsmpWith the demand reactive power Q for receivingcmdStill inconsistent, then the first regulation closed-loop element 302 continues iteratively
Perform said process (that is, the Iq_offset of exporting change), promote the second regulation closed-loop element 303 to continue to be iteratively performed with
Lower operation：Current transformer 311 and net side electric current loop the reactive current Iq for adjusting wind-driven generator 310 causes Iq_cmd+Iq_
Offset-Iq=0 so that the reactive power of the wind-driven generator 310 measured from the metering device 312 of wind-driven generator 310
QsmpAlso adjust therewith, until the reactive power that will be measured from the metering device 312 of wind-driven generator 310 adjusts QsmpIt is and connects
The demand reactive power Q for receivingcmdConsistent (that is, the nothings that calculate of the first arithmetic element 302-2 of the first regulation closed-loop element 302
Work(power difference (Qcmd-QsmpUntill)=0).
When the reactive power Q measured from the metering device 312 of wind-driven generator 310smpWith the idle work(of demand for receiving
Rate QcmdWhen consistent, the first regulation regulation closed-loop element 303 of closed-loop element 302 and second completes repeatedly to complete iterative operation, and respectively
Export the calibration reactive current Iq_offset of the stabilization and reference reactive current Iq_ref of stabilization.
Because filter capacitor parameter is fixed, line voltage robustness is stronger, and the reactive power of distribution transformer is smaller,
Therefore in the range of certain hour, reactive current Iq_offset substantially constants are calibrated.Therefore, in reactive power adjustment device 300
The reactive power Q of the wind-driven generator that will be measured from the metering device 312 of wind-driven generator 310smpIt is adjusted to and receives
Demand reactive power QcmdAfter consistent, when the demand reactive power Q for receivingcmdDuring change, the second regulation closed-loop element 303 is led to
Cross the calibration reactive current Iq_ of the stabilization exported when being directly previously completed iterative operation using the first regulation closed-loop element 302
Offset performs iterative operation, until the reactive current Iq that collects from the current transformer 311 of wind-driven generator 310 with calculate
Demand reactive current Iq_cmd adds the consistent with (Iq_cmd+Iq_offset) of calibration reactive current Iq_offset for exporting
This.Now, the reactive power Q of the wind-driven generator 310 measured from the metering device 312 of wind-driven generator 310smpAlso with change
Demand reactive power Q after changecmdUnanimously.
Specifically, when the demand reactive power Q for receivingcmdDuring change, the second fortune of the second regulation closed-loop element 303
Calculate unit 303-2 and demand reactive current, the second regulation closed loop list are recalculated by using the demand reactive power after change
3rd arithmetic element 303-3 of unit 303 adjusts closed-loop element 302 by using the demand reactive current for recalculating and first
The calibration reactive current of the stabilization of the first PID controller 302-3 outputs calculates reactive current difference, and the second regulation closed loop
Unit 303 performs iterative operation so that the reference reactive current output that the second PID controller 303-4 will change to wind-power electricity generation
The current transformer of machine to adjust the reactive current that collecting unit 303-1 is collected from the current transformer 311 of wind-driven generator, until the 3rd
Reactive current difference (the Q that arithmetic element 303-3 is calculatedcmd-Qsmp) be equal to 0 untill, so as to from the metering of wind-driven generator 310
The reactive power Q of the wind-driven generator 310 that device 312 is measuredsmpAlso with change after demand reactive power QcmdUnanimously.
Therefore, when the demand reactive power Q for receivingcmdDuring change, it is only necessary to held by the second regulation closed-loop element 303
Row iteration is operated, and without the first regulation iterative operation again of closed-loop element 302, and wind is accurately adjusted so as to reach not only quick
The reactive power Q of power generatorsmpEffect.
Fig. 4 is the method for the reactive power for adjusting wind-driven generator for showing exemplary embodiment of the invention
400 flow chart.
Reference picture 4, in step 401, receiving unit 301 can receive the demand reactive power Q of wind-driven generatorcmd。
In step 402, the first regulation closed-loop element 302 can be based on the demand reactive power Q for receivingcmdSent out with from wind-force
The reactive power Q of the wind-driven generator that the metering device of motor is measuredsmp, calculate and export for the deviation to reactive current
The calibration reactive current Iq_offset for being calibrated.
Specifically, the measuring unit 302-1 of the first regulation closed-loop element 302 can be filled from the metering of wind-driven generator 310
Put the reactive power Q of 312 measurement wind-driven generators 310smp.First arithmetic element 302-2 of the first regulation closed-loop element 302 can
By the demand reactive power Q that will be receivedcmdSubtract the reactive power Q measuredsmpTo calculate reactive power difference (Qcmd-
Qsmp).First PID controller of the first regulation closed-loop element 302 can be based on the reactive power difference (Q for calculatingcmd-Qsmp), wind
The maximum reactive current Iq_Max of the power generator and minimum reactive current Iq_Min of wind-driven generator, calculates and exports for right
The calibration reactive current Iq_offset that the deviation of reactive current is calibrated.
In step 403, the second regulation closed-loop element 303 can be based on the demand reactive power Q for receivingcmd, output calibration
The reactive current Iq that reactive current Iq_offset and the current transformer from wind-driven generator are collected, calculates for adjusting wind-force hair
The reference reactive current Iq_ref of current transformer 311 and net side electric current loop the reactive current of motor 310, and the ginseng that will be calculated
Reactive current Iq_ref outputs to the current transformer 311 of wind-driven generator 310 are examined, to adjust the current transformer from wind-driven generator 310
The 311 reactive current Iq for collecting.
Specifically, the collecting unit 303-1 of the second regulation closed-loop element 302 can be from the current transformer of wind-driven generator 310
311 collection reactive current Iq.Second arithmetic element 303-2 of the second regulation closed-loop element 302 can be by the demand that will receive
Reactive power QcmdDemand reactive current Iq_cmd is calculated divided by the grid-connected power network rated voltage E of wind-driven generator 300, i.e.Second regulation closed-loop element 302 the 3rd arithmetic element 303-3 by will calculate the idle electricity of demand
Stream Iq_cmd then subtracts the reactive current Iq of collection and calculates reactive current plus the calibration reactive current Iq_offset of output
Difference (Iq_cmd+Iq_offset-Iq).Second PID controller 303-4 of the second regulation closed-loop element 302 can be based on calculating
Reactive current difference (Iq_cmd+Iq_offset-Iq), the maximum reactive current Iq_Max and wind-power electricity generation of wind-driven generator
The minimum reactive current Iq_Min of machine, calculates current transformer 311 and net side electric current loop the nothing for adjusting wind-driven generator 310
The reference reactive current Iq_ref of work(electric current, and this is arrived the unsteady flow of wind-driven generator 310 with reference to reactive current Iq_ref outputs
Device 311.
Below, will be described in detail the reactive power for adjusting wind-driven generator of exemplary embodiment of the invention
Method 400.
When the demand reactive power Q that receiving unit 301 is receivedcmdWith measuring unit 302-1 from wind-driven generator 310
The reactive power Q of the wind-driven generator 310 that metering device 312 is measuredsmpWhen inconsistent, method 400 is iteratively performed step
402 and step 403 with respectively exporting change calibration reactive current Iq_offset and change reference reactive current Iq_ref,
So that the reactive power Q of the wind-driven generator 310 measured from the metering device 312 of wind-driven generator 310smpWith receive
The consistent Q of demand reactive powercmd。
When the reactive power of the wind-driven generator 310 measured from the metering device 312 of wind-driven generator 310 with receive
Demand reactive power QcmdWhen consistent, the iteration of step 402 and step 403 is completed, and exports the idle electricity of calibration of stabilization respectively
The reference reactive current Iq_ref of stream Iq_offset and stabilization.
Specifically, the demand reactive power Q that receiving unit 301 is receivedcmdWith measuring unit 302-1 from wind-power electricity generation
The reactive power Q of the wind-driven generator 310 that the metering device 312 of machine 310 is measuredsmpWhen inconsistent, the first regulation closed-loop element
302 the first arithmetic element 302-2 calculates reactive power difference (Qcmd-Qsmp), a PID of the first regulation closed-loop element 302
Controller 302-3 is by reactive power difference (Qcmd-Qsmp) as input, and the maximum reactive current based on wind-driven generator 310
The minimum reactive current Iq_Min of Iq_Max and wind-driven generator 310, calculates calibration reactive current Iq_offset, and will calculate
The calibration reactive current Iq_offset outputs for going out adjust closed-loop element 303 to second.Additionally, the second regulation regulation closed-loop element
303 collecting unit 303-1 gathers reactive current Iq from the current transformer 311 of wind-driven generator 310, and the second regulation regulation is closed
Second arithmetic element 303-2 of ring element 303 is by demand reactive power QcmdIt is demand reactive current Iq_cmd to convert.
Second regulation closed-loop element 303 is obtaining calibration reactive current Iq_offset, demand reactive current Iq_cmd and nothing
, it is necessary to be iterated regulation after work(electric current Iq, the reactive current that will be collected from the current transformer 311 of wind-driven generator 310
Iq be adjusted to the demand reactive current Iq_cmd for calculating plus output calibration reactive current Iq_offset's and (Iq_cmd+
Iq_offset it is) consistent.That is, the second regulation closed-loop element 303 can be idle by the reference of successive ignition ground exporting change
Electric current Iq_ref adjusts current transformer 311 and net side electric current loop the reactive current of wind-driven generator 310, until Iq_cmd+
Untill Iq_offset-Iq=0.When the reactive current Iq collected from the current transformer 311 of wind-driven generator 310 and the need for calculating
Ask reactive current Iq_cmd plus output calibration reactive current Iq_offset it is consistent with (Iq_cmd+Iq_offset) when,
Second regulation closed-loop element 303 completes iterative operation, and exports the reference reactive current Iq_ref of stabilization.
Now, because current transformer 311 and net side electric current loop the reactive current of wind-driven generator 310 is conditioned, wind-force
The reactive power of generator 310 is also adjusted therewith, therefore measuring unit 302-1 is surveyed from the metering device 312 of wind-driven generator 310
The reactive power Q of the wind-driven generator 310 for measuringsmpAlso change.
If the wind-driven generator 310 that measuring unit 302-1 is measured from the metering device 312 of wind-driven generator 310
Reactive power QsmpWith the demand reactive power Q for receivingcmdUnanimously, then method 400 is completed.
If the wind-driven generator 310 that measuring unit 302-1 is measured from the metering device 312 of wind-driven generator 310
Reactive power QsmpWith the demand reactive power Q for receivingcmdStill inconsistent, then method 400 is iteratively performed step 402 to export
The calibration reactive current Iq_offset of change, promotes to be iteratively performed step 403 (that is, the unsteady flow of regulation wind-driven generator 310
Device 311 and the reactive current Iq of net side electric current loop causes Iq_cmd+Iq_offset-Iq=0 so that from wind-driven generator 310
The reactive power Q of wind-driven generator 310 measured of metering device 312smpAlso adjust therewith), until will be from wind-driven generator
The reactive power regulation Q that 310 metering device 312 is measuredsmpThe demand reactive power Q for being and receivingcmd(that is, first adjusts
Save the reactive power difference (Q that the first arithmetic element 302-2 of closed-loop element 302 is calculatedcmd-QsmpUntill)=0) is consistent.
When the reactive power Q measured from the metering device 312 of wind-driven generator 310smpWith the idle work(of demand for receiving
Rate QcmdWhen consistent, the iteration of step 402 and step 403 is completed, and exports the calibration reactive current Iq_offset of stabilization respectively
With the reference reactive current Iq_ref of stabilization.
Because filter capacitor parameter is fixed, line voltage robustness is stronger, and the reactive power of distribution transformer is smaller,
Therefore in the range of certain hour, reactive current Iq_offset substantially constants are calibrated.Therefore, in reactive power adjustment device 300
The reactive power Q of the wind-driven generator that will be measured from the metering device 312 of wind-driven generator 310smpIt is adjusted to and receives
Demand reactive power QcmdAfter consistent, when the demand reactive power Q for receivingcmdDuring change, method 400 is by directly using first
It is preceding complete step 402 iteration when the calibration reactive current Iq_offset of stabilization that exports be iteratively performed step 403, directly
Added with the demand reactive current Iq_cmd for calculating to the reactive current Iq collected from the current transformer 311 of wind-driven generator 310
The consistent with (Iq_cmd+Iq_offset) of the calibration reactive current Iq_offset of output is this.Now, from wind-driven generator
The reactive power Q of the wind-driven generator 310 that 310 metering device 312 is measuredsmpAlso with change after demand reactive power Qcmd
Unanimously.
Specifically, when the demand reactive power Q for receivingcmdDuring change, method 400 is by using the demand after change
Reactive power recalculates demand reactive current, by using the demand reactive current for recalculating and the first regulation closed loop list
The calibration reactive current of the stabilization of the first PID controller 302-3 outputs of unit 302 calculates reactive current difference, and iteration
Ground performs step 403 so that the reference reactive current that will be changed by the second PID controller 303-4 is exported to wind-driven generator
Current transformer to adjust the reactive current that collecting unit 303-1 is collected from the current transformer 311 of wind-driven generator, until the 3rd fortune
Calculate the reactive current difference (Q that unit 303-3 is calculatedcmd-Qsmp) be equal to 0 untill, so as to be filled from the metering of wind-driven generator 310
Put the reactive power Q of 312 wind-driven generators 310 measuredsmpAlso with change after demand reactive power QcmdUnanimously.
Therefore, when the demand reactive power Q for receivingcmdDuring change, it is only necessary to iteratively perform step 403, and nothing
Step 402 need to be iteratively performed, so as to reach reactive power Q that is not only quick but also accurately adjusting wind-driven generatorsmpEffect.
Apparatus and method for adjusting the reactive power of wind-driven generator of the invention, can be adjusted by quick response
The reactive current regulation control closed loop of section and the reactive current deviation calibration closed loop of accurate calibration regulation are not only quick but also smart to realize
Really adjust the effect of the reactive power of wind-driven generator.Additionally, of the invention for adjusting the idle of wind-driven generator
The apparatus and method of power, because current transformer from wind-driven generator grid entry point without gathering reactive current, therefore, can be without in wind
Power generator grid entry point installs current sensor additional.Additionally, of the invention for adjusting the reactive power of wind-driven generator
Apparatus and method, after the calibration reactive current for calculating stabilization, without measuring wind-driven generator in real time simultaneously from metering device
The reactive power of site, therefore, the response speed requirement to metering device is low, and need not be the response speed for improving metering device
And increase cost.Additionally, the apparatus and method for adjusting the reactive power of wind-driven generator of the invention, join to hardware
Number no requirement (NR), highly versatile.
The above method of the invention can be performed according to computer program instructions.Because these programmed instruction can be wrapped
Include in computer, application specific processor or programmable or specialized hardware, thus the instruction for performing wherein can be conducive to it is above-mentioned
The execution of function.As understood by those skilled in the art, computer, processor or programmable hardware include to store or connecing
The memory device of software or computer code is received, the software or computer code are by computer, processor or hardware access
Method with realizing describing in the present invention when performing.
Although the present invention is shown and described with reference to its exemplary embodiment, those skilled in the art should
The understanding, in the case where the spirit and scope of the present invention limited by claim and its equivalent are not departed from, can be to it
Form and details carry out various changes.
Claims (18)
1. a kind of device for adjusting the reactive power of wind-driven generator, including：
Receiving unit, receives the demand reactive power of wind-driven generator；
First regulation closed-loop element, what the metering device based on the demand reactive power for receiving and from wind-driven generator was measured
The reactive power of wind-driven generator, calculates and exports the calibration reactive current calibrated for the deviation to reactive current；
Second regulation closed-loop element, based on the demand reactive power, the calibration reactive current of output that receive and from wind-power electricity generation
The reactive current that the current transformer of machine is collected, calculates the current transformer and the idle electricity of net side electric current loop for adjusting wind-driven generator
The reference reactive current of stream, and the reference reactive current output that will be calculated is to the current transformer of wind-driven generator, to adjust from wind
The reactive current that the current transformer of power generator is collected.
2. device as claimed in claim 1, wherein, the metering when the demand reactive power for receiving and from wind-driven generator is filled
Put the wind-driven generator measured reactive power it is inconsistent when, first regulation closed-loop element and second regulation closed-loop element perform
Iterative operation with the calibration reactive current of exporting change respectively and the reference reactive current for changing so that from the meter of wind-driven generator
The reactive power of the wind-driven generator that amount measurement device goes out is consistent with the demand reactive power for receiving.
3. device as claimed in claim 2, wherein, when the wind-driven generator measured from the metering device of wind-driven generator
When reactive power is consistent with the demand reactive power for receiving, the first regulation closed-loop element and the second regulation closed-loop element complete to change
Generation operation, and the calibration reactive current of stabilization and the reference reactive current of stabilization are exported respectively.
4. device as claimed in claim 3, wherein, when the demand reactive power for receiving changes, the second regulation closed loop list
The calibration reactive current of stabilization that unit exports when being previously completed iterative operation by using the first regulation closed-loop element is performed repeatedly
Generation operation so that the reactive power of the wind-driven generator measured from the metering device of wind-driven generator with change after demand without
Work(power is consistent.
5. device as claimed in claim 1, wherein, the first regulation closed-loop element includes：
Measuring unit, the reactive power of wind-driven generator is measured from the metering device of wind-driven generator；
First arithmetic element, subtracts the reactive power measured to calculate reactive power by the demand reactive power that will be received
Difference；
First PID controller, maximum reactive current and wind-power electricity generation based on the reactive power difference, wind-driven generator for calculating
The minimum reactive current of machine, calculates and exports the calibration reactive current.
6. device as claimed in claim 5, wherein, the second regulation closed-loop element includes：
Collecting unit, reactive current is gathered from the current transformer of wind-driven generator；
Second arithmetic element, by the demand reactive power that will receive divided by the grid-connected power network rated voltage of wind-driven generator come
Calculating demand reactive current；
3rd arithmetic element, adds the calibration reactive current of output, then subtract collection by the demand reactive current that will be calculated
Reactive current calculates reactive current difference；
Second PID controller, based on the reactive current difference, the maximum reactive current of wind-driven generator and the wind-power electricity generation that calculate
The minimum reactive current of machine, calculates the reference reactive current, and reference reactive current output is arrived into wind-driven generator
Current transformer.
7. device as claimed in claim 6, wherein, when the idle electricity that collecting unit is collected from the current transformer of wind-driven generator
The demand reactive current that stream is calculated with the second arithmetic element is plus the calibration reactive current of the first PID controller output and not
When consistent, the second regulation closed-loop element performs iterative operation so that the reference reactive current output that the second PID controller will change
To the current transformer of wind-driven generator adjusting the reactive current that collecting unit is collected from the current transformer of wind-driven generator, Zhi Dao
Untill the reactive current difference that three arithmetic elements are calculated is equal to 0,
The demand calculated with the second arithmetic element when the reactive current that collecting unit is collected from the current transformer of wind-driven generator without
Work(electric current plus the first PID controller output calibration reactive current with it is consistent when, second regulation closed-loop element completion iteration
Operation, and the stable reference reactive current of the second PID controller output.
8. device as claimed in claim 7, wherein, when measuring unit from the metering device of wind-driven generator measure it is current
When reactive power is inconsistent with the demand reactive power for receiving, the first regulation closed-loop element performs iterative operation so that first
The calibration reactive current of PID controller exporting change, to promote the second regulation closed-loop element to be iterated operation, until the first fortune
Untill the reactive power difference that calculation unit is calculated is equal to 0,
When measuring unit from the metering device of the wind-driven generator reactive power measured and the demand reactive power one for receiving
During cause, the first regulation closed-loop element completes iterative operation, and the stable calibration reactive current of the first PID controller output.
9. device as claimed in claim 8, wherein, when the demand reactive power for receiving changes, the second arithmetic element is led to
Cross using the demand reactive power after change to recalculate demand reactive current, the 3rd arithmetic element is by using recalculating
Demand reactive current and the calibration reactive current of stabilization of the first PID controller output calculate reactive current difference, and
Second regulation closed-loop element performs iterative operation so that the reference reactive current output that the second PID controller will change to wind-force
The current transformer of generator to adjust the reactive current that collecting unit is collected from the current transformer of wind-driven generator, until the 3rd computing
Untill the reactive current difference that unit is calculated is equal to 0, so as to the reactive power measured from the metering device of wind-driven generator
It is consistent with the demand reactive power after change.
10. a kind of method for adjusting the reactive power of wind-driven generator, including：
(A) the demand reactive power of wind-driven generator is received；
(B) nothing of the wind-driven generator measured based on the demand reactive power and the metering device from wind-driven generator that receive
Work(power, calculates and exports the calibration reactive current calibrated for the deviation to reactive current；
(C) current transformer based on the demand reactive power, the calibration reactive current of output for receiving and from wind-driven generator is gathered
The reactive current for arriving, calculates the current transformer and the idle electricity of reference of the reactive current of net side electric current loop for adjusting wind-driven generator
Stream, and the reference reactive current output that will be calculated is to the current transformer of wind-driven generator, to adjust the unsteady flow from wind-driven generator
The reactive current that device is collected.
11. methods as claimed in claim 10, also include：
The idle work(of the wind-driven generator that the metering device when the demand reactive power for receiving and from wind-driven generator is measured
When rate is inconsistent, step (B) and step (C) are iteratively performed with the reference of the calibration reactive current of exporting change and change respectively
Reactive current, so that the reactive power of the wind-driven generator measured from the metering device of wind-driven generator and the demand for receiving
Reactive power is consistent.
12. methods as claimed in claim 11, also include：
When the reactive power and the idle work(of demand for receiving of the wind-driven generator measured from the metering device of wind-driven generator
When rate is consistent, the iteration of step (B) and step (C) is completed, and exports the reference of the calibration reactive current and stabilization of stabilization respectively
Reactive current.
13. methods as claimed in claim 12, also include：
When the demand reactive power for receiving changes, the stabilization exported during by using the iteration for being previously completed step (B)
Calibrate reactive current to be iteratively performed step (C), so that the wind-driven generator measured from the metering device of wind-driven generator
Reactive power it is consistent with the demand reactive power for receiving.
14. methods as claimed in claim 10, wherein, step (B) includes：
The reactive power of wind-driven generator is measured from the metering device of wind-driven generator；
The reactive power measured is subtracted by the demand reactive power that will be received to calculate reactive power difference；
Reactive power difference, the maximum reactive current of wind-driven generator and the wind-force for being based on calculating by the first PID controller
The minimum reactive current of generator, calculates the calibration reactive current；
Export the calibration reactive current.
15. methods as claimed in claim 14, wherein, step (C) includes：
Reactive current is gathered from the current transformer of wind-driven generator；
It is idle to calculate demand divided by the grid-connected power network rated voltage of wind-driven generator by the demand reactive power that will be received
Electric current；
By the demand reactive current that will calculate plus the calibration reactive current of output, then subtract the reactive current of collection and count
Calculate reactive current difference；
By the second PID controller by based on calculate reactive current difference, the maximum reactive current of wind-driven generator and
The minimum reactive current of wind-driven generator, calculates the reference reactive current；
By the current transformer of reference reactive current output to wind-driven generator.
16. methods as claimed in claim 15, also include：When the reactive current that is collected from the current transformer of wind-driven generator with
The demand reactive current of calculating plus output it is calibration reactive current and inconsistent when, be iteratively performed step (C) to pass through
Second PID controller exports to the current transformer of wind-driven generator to adjust from wind-driven generator the reference reactive current of change
The reactive current that current transformer is collected, untill the reactive current difference for calculating is equal to 0；
When the reactive current collected from the current transformer of wind-driven generator with the demand reactive current for calculating plus the calibration for exporting
Reactive current with it is consistent when, the iteration of step (C) is completed, and idle by reference that the second PID controller exports stabilization
Electric current.
17. methods as claimed in claim 16, also include：It is current idle when what is measured from the metering device of wind-driven generator
When power is inconsistent with the demand reactive power for receiving, it is iteratively performed step (B) and exports change with by the first PID controller
The calibration reactive current of change, to promote to be iteratively performed step (C), untill the reactive power difference for calculating is equal to 0；
When the reactive power measured from the metering device of wind-driven generator is consistent with the demand reactive power for receiving, step
(B) iteration is completed, and the calibration reactive current of stabilization is exported by the first PID controller.
18. methods as claimed in claim 17, also include：When the demand reactive power that receives changes, by using changing
Demand reactive power after change recalculates demand reactive current, by using the demand reactive current for recalculating and first
The calibration reactive current of the stabilization of PID controller output calculates reactive current difference, and is iteratively performed step (C) and causes
The reference reactive current of change is exported to the current transformer of wind-driven generator to adjust from wind-power electricity generation by the second PID controller
The reactive current that the current transformer of machine is collected, untill the reactive current difference that calculates is equal to 0, so as to from wind-driven generator
The reactive power measured of metering device it is consistent with the demand reactive power after changing.
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