CN105634011B - The control method and control device of wind power generation system - Google Patents
The control method and control device of wind power generation system Download PDFInfo
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- CN105634011B CN105634011B CN201610070198.XA CN201610070198A CN105634011B CN 105634011 B CN105634011 B CN 105634011B CN 201610070198 A CN201610070198 A CN 201610070198A CN 105634011 B CN105634011 B CN 105634011B
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- 238000010248 power generation Methods 0.000 title claims abstract description 37
- 230000001052 transient effect Effects 0.000 claims abstract description 154
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- 230000010354 integration Effects 0.000 claims description 35
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- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000013016 damping Methods 0.000 claims description 7
- 239000000284 extract Substances 0.000 claims description 6
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Classifications
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/007—Control circuits for doubly fed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
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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
Abstract
The present invention discloses a kind of control method of wind power generation system, and electric network state is determined using positive sequence fundametal compoment of the ac voltage of power network under dq coordinate systems and negative sequence voltage value；It is determined that power network occurs in the case that depth symmetrically falls failure, by the rotor for exchanging crow bar short circuit wind energy double-fed generator；When it is determined that meeting default recovery condition, excision exchange crow bar, the pusher side current transformer in wind energy double-feed current transformer is restarted；Determine the referenced reactive current value and watt current command value of the rotor of wind energy double-fed generator, referenced reactive current value and watt current command value are modified using the transient DC component in wind energy double-fed generator stator current, the reactive current set-point and watt current set-point obtained using amendment carries out closed-loop current control to the rotor of wind energy double-fed generator.Based on control method disclosed by the invention, it is possible to increase the reactive current response speed of wind energy double-fed generator.
Description
Technical field
The invention belongs to the control method and control device in wind energy power technology field, more particularly to wind power generation system.
Background technology
When symmetrical cataclysm failure (such as transient state is fallen and transient state lifting) occurs for power network, wind power generation system is wanted can be quick
Reactive current needed for from ground to power network compensation, to support line voltage to recover normal, reactive-current compensation is avoided to cause electricity slowly excessively
Net fault degree is deepened.
A kind of existing wind power generation system is mainly made up of wind energy double-fed generator and wind energy double-feed current transformer, its apoplexy
The net side current transformer of energy double-feed current transformer is connected with power network, pusher side current transformer and the wind energy double-fed generator of wind energy double-feed current transformer
Rotor-side connection, the stator side of wind energy double-fed generator is connected with power network., can be in wind when symmetrical cataclysm failure occurs in power network
Transient DC magnetic linkage can be induced in the stator magnetic linkage of double-fed generator.Particularly when larger temporal variations occurs in power network,
The transient DC magnetic linkage that the stator side of wind energy double-fed generator induces will have a strong impact on the safety of pusher side current transformer, even result in
Pusher side current transformer is out of control.
For the wind power generation system of this type, the control mode of generally use is at present：When wind energy double-fed generator
Stator current or rotor current when there is excessively stream, using the rotor for exchanging crow bar short circuit wind energy double-fed generator, so as to decline
Transient state magnetic linkage in checking energy double-fed generator, protect wind energy double-feed current transformer, in this course, wind energy double-fed generator with
Squirrel-cage induction machine mode run, the support of reactive power can not be provided to power network；After several ms, excision exchange sled
Rod, wind energy double-fed generator is controlled to provide reactive power support to power network from wind energy double-feed current transformer.
But based on above-mentioned control mode, the response speed of the reactive current of wind power generation system is slower, is extremely difficult to electricity
The requirement of reactive power support is quickly carried out when netting symmetrical cataclysm failure to power network.
The content of the invention
In view of this, it is an object of the invention to provide a kind of control method of wind power generation system and control device, with
The response speed of wind power generation system reactive current when symmetrical cataclysm failure occurs for power network is improved, symmetrical cataclysm occurs in power network
During failure, required reactive current is rapidly supplemented to power network.
To achieve the above object, the present invention provides following technical scheme：
The present invention discloses a kind of control method of wind power generation system, and the wind power generation system includes wind energy doubly-fed generation
Machine and wind energy double-feed current transformer, the control method include：
Detect the ac voltage of power network；
The ac voltage detected is transformed under dq coordinate systems from two-phase rest frame；
Electric network state is determined using positive sequence fundametal compoment of the ac voltage under dq coordinate systems and negative sequence voltage value；
In the case of it is determined that power network generation depth symmetrically falls failure, sent out by exchanging wind energy double-fed described in crow bar short circuit
The rotor of motor, monitor whether to meet default recovery condition afterwards；
In the case of it is determined that meeting default recovery condition, excision exchange crow bar, restart in the wind energy double-feed current transformer
Pusher side current transformer；
According to the rotor of the load current value of the pusher side current transformer and the wind energy double-fed generator during transient state
Voltage perunit value, calculate according to the first preset algorithm the wind energy double-fed generator rotor referenced reactive current value, according to
Watt current of the rotor of the wind energy double-fed generator before symmetrical cataclysm failure occurs for power network, determine the wind energy double-fed hair
The watt current command value of the rotor of motor；
The transient DC component in the wind energy double-fed generator stator current is extracted, utilizes the transient DC extracted point
Measure and the referenced reactive current value and watt current command value of the rotor of the wind energy double-fed generator are modified, obtain idle
Given value of current value and watt current set-point；
Rotor using the reactive current set-point and the watt current set-point to the wind energy double-fed generator
Carry out closed-loop current control.
Preferably, in above-mentioned control method, the positive sequence fundamental wave point using the ac voltage under dq coordinate systems
After amount and negative sequence voltage value determine electric network state, in addition to：
In the case of it is determined that the symmetrical cataclysm failure of either shallow occurs for power network, according to the load current value of the pusher side current transformer
The wind energy is calculated with voltage perunit value during transient state of the rotor of the wind energy double-fed generator, according to the first preset algorithm
The referenced reactive current value of the rotor of double-fed generator, it is symmetrical rapid in power network generation according to the rotor of the wind energy double-fed generator
The watt current become before failure, determine the watt current command value of the rotor of the wind energy double-fed generator；
The transient DC component in the wind energy double-fed generator stator current is extracted, utilizes the transient DC extracted point
Measure and the referenced reactive current value and watt current command value of the rotor of the wind energy double-fed generator are modified, obtain idle
Given value of current value and watt current set-point；
Rotor using the reactive current set-point and the watt current set-point to the wind energy double-fed generator
Carry out closed-loop current control.
Preferably, in above-mentioned control method, the rotor according to the wind energy double-fed generator occurs symmetrical in power network
Watt current before cataclysm failure, the watt current command value of the rotor of the wind energy double-fed generator is determined, including：By described in
Watt current of the rotor of wind energy double-fed generator before symmetrical cataclysm failure occurs for power network is as the wind energy double-fed generator
Rotor watt current command value；
It is described according to the load current value of the pusher side current transformer and the rotor of the wind energy double-fed generator in the transient state phase
Between voltage perunit value, calculate according to the first preset algorithm the wind energy double-fed generator rotor referenced reactive current value,
Including：
When power network generation transient state is fallen, according to formula irq_ref=1.3* (0.9-Un)*IrDetermine that the wind energy is double
Present the referenced reactive current value of the rotor of generator；
When transient state lifting occurs for the power network, according to formula irq_ref=1.3* (1.1-Un)*IrDetermine that the wind energy is double
Present the referenced reactive current value of the rotor of generator；
Wherein, irq_refFor the referenced reactive current value of the rotor of the wind energy double-fed generator, UnFor the wind energy double-fed
Voltage perunit value of the rotor of generator during transient state, IrFor the load current value of the pusher side current transformer.
Preferably, in above-mentioned control method, the transient DC in the extraction wind energy double-fed generator stator current
Component, using the transient DC component extracted to the referenced reactive current value of the rotor of the wind energy double-fed generator and active
Current instruction value is modified, and obtains reactive current set-point and watt current set-point, including：
The transient DC d axis components in the wind energy double-fed generator stator current are extracted, by the transient DC d axles point
Amount is converted into the quantized value i of rotor currentrd_s；
The transient DC q axis components in the wind energy double-fed generator stator current are extracted, by the transient DC q axles point
Amount is converted into the quantized value i of rotor currentrq_s；
According to formula irq_ref'=irq_ref-k*ird_sTo the referenced reactive current of the rotor of the wind energy double-fed generator
Value irq_refIt is modified, obtains reactive current set-point irq_ref′；
According to formula ird_ref'=ird_ref+k*irq_sThe watt current of the rotor of the wind energy double-fed generator is instructed
Value ird_refIt is modified, obtains watt current set-point ird_ref′；
Wherein, k is the damping gain coefficient of the transient state component of the wind energy double-fed generator.
Preferably, in above-mentioned control method, in the case of it is determined that the symmetrical cataclysm failure of either shallow occurs for power network, using described
Reactive current set-point and the watt current set-point carry out closed-loop current control to the rotor of the wind energy double-fed generator,
Including：
Calculate the watt current set-point ird_ref' watt current the feedback with the rotor of the wind energy double-fed generator
Value irdThe first difference, calculate the reactive current set-point irq_ref' idle the electricity with the rotor of the wind energy double-fed generator
Flow value of feedback irqThe second difference；
Proportional integration regulation is carried out to first difference and produces the first component, proportional integration is carried out to second difference
Regulation produces second component；
Calculate first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate the second component and second
Feedback quantity ω LrirdFirst and value urq, wherein, LrFor the rotor self-induction of the wind energy double-fed generator；
To the 3rd difference urdWith described first and value urqCoordinate Conversion is carried out, determines the wind energy double-feed current transformer
In target output voltage value of the pusher side current transformer under two-phase rest frame；
The pusher side current transformer in the wind energy double-feed current transformer is controlled to export the target output voltage value.
Preferably, in above-mentioned control method, in the case of it is determined that the symmetrical cataclysm failure of depth occurs for power network, using described
Reactive current set-point and the watt current set-point carry out closed-loop current control to the rotor of the wind energy double-fed generator,
Including：
Calculate the watt current set-point ird_ref' watt current the feedback with the rotor of the wind energy double-fed generator
Value irdThe first difference, calculate the reactive current set-point irq_ref' idle the electricity with the rotor of the wind energy double-fed generator
Flow value of feedback irqThe second difference；
Dynamic proportion integral adjustment is carried out to first difference and produces the first component, Mobile state is entered to second difference
Proportional integration regulation produces second component；Wherein, dynamic proportion integration is carried out to first difference and second difference to adjust
The ratio control parameter used during section is n*P, and dynamic proportion integration is carried out to first difference and second difference
The integration control parameter used during regulation is incrementally increased to I from initial value according to default step-length, wherein, n is transient state amendment
It is the ratio control used under the pusher side current transformer normal operating condition in the wind energy double-feed current transformer that coefficient, value, which are more than 1, P,
Parameter processed, I are the integration control parameter used under the pusher side current transformer normal operating condition in the wind energy double-feed current transformer；
Calculate first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate the second component and second
Feedback quantity ω LrirdFirst and value urq, wherein, LrFor the rotor self-induction of the wind energy double-fed generator；
To the 3rd difference urdWith described first and value urqCoordinate Conversion is carried out, determines the wind energy double-feed current transformer
In target output voltage value of the pusher side current transformer under two-phase rest frame；
The pusher side current transformer in the wind energy double-feed current transformer is controlled to export the target output voltage value.
Invention additionally discloses a kind of control device of wind power generation system, the wind power generation system is sent out including wind energy double-fed
Motor and wind energy double-feed current transformer, the control device include：
Voltage detection unit, for detecting the ac voltage of power network；
Electric network state determining unit, for the ac voltage detected to be transformed into dq coordinates from two-phase rest frame
Under system, electric network state is determined using positive sequence fundametal compoment of the ac voltage under dq coordinate systems and negative sequence voltage value；
First control unit, for determining that power network occurs depth and symmetrically falls failure in the electric network state determining unit
In the case of, by exchanging the rotor of wind energy double-fed generator described in crow bar short circuit, monitor whether to meet default recovery condition afterwards,
In the case of it is determined that meeting default recovery condition, excision exchange crow bar, the pusher side restarted in the wind energy double-feed current transformer becomes
Flow device；
First command value determining unit, for the machine in restarting the wind energy double-feed current transformer in first control unit
After side converter, according to the rotor of the load current value of the pusher side current transformer and the wind energy double-fed generator in the transient state phase
Between voltage perunit value, calculate according to the first preset algorithm the wind energy double-fed generator rotor referenced reactive current value,
According to watt current of the rotor of the wind energy double-fed generator before symmetrical cataclysm failure occurs for power network, determine that the wind energy is double
Present the watt current command value of the rotor of generator；
First command value amending unit, for extracting the transient DC in the wind energy double-fed generator stator current point
Amount, the referenced reactive current value that is determined using the transient DC component extracted to the first command value determining unit and active
Current instruction value is modified, and obtains reactive current set-point and watt current set-point；
Second control unit, for the reactive current set-point and described obtained using the first command value amending unit
Watt current set-point carries out closed-loop current control to the rotor of the wind energy double-fed generator.
Preferably, above-mentioned control device also includes：
Second command value determining unit, for it is determined that power network occur the symmetrical cataclysm failure of either shallow in the case of, according to institute
State the load current value of pusher side current transformer and voltage perunit value of the rotor during transient state of the wind energy double-fed generator, according to
First preset algorithm calculates the referenced reactive current value of the rotor of the wind energy double-fed generator, according to the wind energy doubly-fed generation
Watt current of the rotor of machine before symmetrical cataclysm failure occurs for power network, determine the wind energy double-fed generator rotor it is active
Current instruction value；
Second command value amending unit, for extracting the transient DC in the wind energy double-fed generator stator current point
Amount, the referenced reactive current value that is determined using the transient DC component extracted to the second command value determining unit and active
Current instruction value is modified, and obtains reactive current set-point and watt current set-point；
3rd control unit, for the reactive current set-point and described obtained using the second command value amending unit
Watt current set-point carries out closed-loop current control to the rotor of the wind energy double-fed generator.
Preferably, in above-mentioned control device, the first command value determining unit and the second command value determining unit
According to watt current of the rotor of the wind energy double-fed generator before symmetrical cataclysm failure occurs for power network, determine that the wind energy is double
The watt current command value of the rotor of generator is presented, is specially：By the rotor of the wind energy double-fed generator in power network generation pair
Claim watt current command value of the watt current before cataclysm failure as the rotor of the wind energy double-fed generator；
The first command value determining unit and the second command value determining unit are according to the volume of the pusher side current transformer
Determine voltage perunit value of the rotor of current value and the wind energy double-fed generator during transient state, calculated according to the first preset algorithm
The referenced reactive current value of the rotor of the wind energy double-fed generator, it is specially：When power network generation transient state is fallen, according to
Formula irq_ref=1.3* (0.9-Un)*IrDetermine the referenced reactive current value of the rotor of the wind energy double-fed generator；Described
When transient state lifting occurs for power network, according to formula irq_ref=1.3* (1.1-Un)*IrDetermine the rotor of the wind energy double-fed generator
Referenced reactive current value；Wherein, irq_refFor the referenced reactive current value of the rotor of the wind energy double-fed generator, UnFor institute
State voltage perunit value of the rotor of wind energy double-fed generator during transient state, IrFor the load current value of the pusher side current transformer.
Preferably, the first command value amending unit described in above-mentioned control device extracts the wind energy doubly-fed generation machine stator electricity
Transient DC component in stream, the first command value determining unit is determined using the transient DC component extracted idle
Current instruction value and watt current command value are modified, and obtain reactive current set-point and watt current set-point, are specially：
The transient DC d axis components in the wind energy double-fed generator stator current are extracted, by the transient DC d axles point
Amount is converted into the quantized value i of rotor currentrd_s；Extract the transient DC q axles point in the wind energy double-fed generator stator current
Amount, the transient DC q axis components are converted into the quantized value i of rotor currentrq_s；According to formula irq_ref'=irq_ref-k*
ird_sThe referenced reactive current value i determined to the first command value determining unitrq_refIt is modified, obtains reactive current and give
Definite value irq_ref′；According to formula ird_ref'=ird_ref+k*irq_sThe watt current determined to the first command value determining unit
Command value ird_refIt is modified, obtains watt current set-point ird_ref′；
The second command value amending unit extracts the transient DC component in the wind energy double-fed generator stator current,
The referenced reactive current value determined using the transient DC component extracted to the second command value determining unit and active electricity
Stream command value is modified, and obtains reactive current set-point and watt current set-point, is specially：
The transient DC d axis components in the wind energy double-fed generator stator current are extracted, by the transient DC d axles point
Amount is converted into the quantized value i of rotor currentrd_s；Extract the transient DC q axles point in the wind energy double-fed generator stator current
Amount, the transient DC q axis components are converted into the quantized value i of rotor currentrq_s；According to formula irq_ref'=irq_ref-k*
ird_sThe referenced reactive current value i determined to the second command value determining unitrq_refIt is modified, obtains reactive current and give
Definite value irq_ref′；According to formula ird_ref'=ird_ref+k*irq_sThe watt current determined to the second command value determining unit
Command value ird_refIt is modified, obtains watt current set-point ird_ref′；
Wherein, k is the damping gain coefficient of the transient state component of the wind energy double-fed generator.
Preferably, the 3rd control unit described in above-mentioned control device utilizes the nothing that the second command value amending unit obtains
Work(given value of current value and the watt current set-point carry out closed-loop current control, tool to the rotor of the wind energy double-fed generator
Body is：
Calculate the watt current set-point i that the second command value amending unit obtainsrd_ref' and wind energy double-fed hair
The watt current value of feedback i of the rotor of motorrdThe first difference, calculate the idle electricity that the second command value amending unit obtains
Flow set-point irq_ref' reactive current value of feedback the i with the rotor of the wind energy double-fed generatorrqThe second difference；
Proportional integration regulation is carried out to first difference and produces the first component, proportional integration is carried out to second difference
Regulation produces second component；
Calculate first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate the second component and second
Feedback quantity ω LrirdFirst and value urq, wherein, LrFor the rotor self-induction of the wind energy double-fed generator；
To the 3rd difference urdWith described first and value urqCoordinate Conversion is carried out, determines the wind energy double-feed current transformer
In target output voltage value of the pusher side current transformer under two-phase rest frame；
The pusher side current transformer in the wind energy double-feed current transformer is controlled to export the target output voltage value.
Preferably, the second control unit described in above-mentioned control device utilizes the nothing that the first command value amending unit obtains
Work(given value of current value and the watt current set-point carry out closed-loop current control, tool to the rotor of the wind energy double-fed generator
Body is：
Calculate the watt current set-point i that the first command value amending unit obtainsrd_ref' and wind energy double-fed hair
The watt current value of feedback i of the rotor of motorrdThe first difference, calculate the idle electricity that the first command value amending unit obtains
Flow set-point irq_ref' reactive current value of feedback the i with the rotor of the wind energy double-fed generatorrqThe second difference；
Dynamic proportion integral adjustment is carried out to first difference and produces the first component, Mobile state is entered to second difference
Proportional integration regulation produces second component；Wherein, dynamic proportion integration is carried out to first difference and second difference to adjust
The ratio control parameter used during section is n*P, and dynamic proportion integration is carried out to first difference and second difference
The integration control parameter used during regulation is incrementally increased to I from initial value according to default step-length, wherein, n is transient state amendment
It is the ratio control used under the pusher side current transformer normal operating condition in the wind energy double-feed current transformer that coefficient, value, which are more than 1, P,
Parameter processed, I are the integration control parameter used under the pusher side current transformer normal operating condition in the wind energy double-feed current transformer；
Calculate first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate the second component and second
Feedback quantity ω LrirdFirst and value urq, wherein, LrFor the rotor self-induction of the wind energy double-fed generator；
To the 3rd difference urdWith described first and value urqCoordinate Conversion is carried out, determines the wind energy double-feed current transformer
In target output voltage value of the pusher side current transformer under two-phase rest frame；
The pusher side current transformer in the wind energy double-feed current transformer is controlled to export the target output voltage value.
As can be seen here, beneficial effects of the present invention are：
In the control method of wind power generation system disclosed by the invention, using the ac voltage of power network under dq coordinate systems
Positive sequence fundametal compoment and negative sequence voltage value determine electric network state, symmetrical cataclysm in power network can be occurred based on the processing mode therefore
The failure is found during barrier as early as possible, corresponding treatment measures can be used as early as possible, the feelings that depth symmetrically falls failure occurs in power network
, can be as early as possible by exchanging the rotor of crow bar short circuit wind energy double-fed generator under condition, so as to shorten from power network, depth occur symmetrical
Fall failure stator side transient DC magnetic linkage into wind energy double feedback electric engine and decay to time needed for default value, and then improve machine
Side converter starts the speed of response；In addition, nothing used in closed-loop current control is carried out to the rotor of wind energy double-fed generator
Work(given value of current value and watt current set-point, it is to utilize the transient DC component in wind energy double-fed generator stator current to wind
The referenced reactive current value and watt current command value of the rotor of energy double-fed generator are modified what is obtained, therefore can accelerate
The decay of stator side transient DC magnetic linkage in wind energy double-fed generator, improve the reactive current response speed of wind energy double-fed generator
Degree.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of flow chart of the control method of wind power generation system disclosed by the invention；
Fig. 2 is the flow chart of the control method of another wind power generation system disclosed by the invention；
Fig. 3 for it is disclosed by the invention using reactive current set-point and watt current set-point to wind energy double-fed generator
Rotor carries out a kind of FB(flow block) of closed-loop current control；
Fig. 4 for it is disclosed by the invention using reactive current set-point and watt current set-point to wind energy double-fed generator
Rotor carries out another FB(flow block) of closed-loop current control；
Fig. 5 is a kind of structural representation of the control device of wind power generation system disclosed by the invention；
Fig. 6 is the structural representation of the control device of another wind power generation system disclosed by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The present invention discloses a kind of control method of wind power generation system, is occurred symmetrically in power network with improving wind power generation system
The response speed of reactive current during cataclysm failure, during symmetrical cataclysm failure occurs for power network, rapidly to needed for power network supplement
Reactive current.
Wind power generation system in the present invention includes wind energy double-fed generator and wind energy double-feed current transformer, wherein, wind energy is double
Net side current transformer in feedback current transformer is connected with power network, the pusher side current transformer in wind energy double-feed current transformer and wind energy double-fed generator
Rotor-side connection, the stator side of wind energy double-fed generator is connected with power network.
Referring to Fig. 1, Fig. 1 is a kind of flow chart of the control method of wind power generation system disclosed by the invention.The controlling party
Method includes：
Step S1：Detect the ac voltage of power network.
Step S2：The ac voltage detected is transformed under dq coordinate systems from two-phase rest frame.
Step S3：Power network shape is determined using positive sequence fundametal compoment of the ac voltage under dq coordinate systems and negative sequence voltage value
State.
The ac voltage detected is transformed under dq coordinate systems, passes through negative phase-sequence of the ac voltage under dq coordinate systems
Magnitude of voltage can determine the cataclysm fault type of power network, specifically, when negative phase-sequence of the ac voltage under dq coordinate systems of power network
When magnitude of voltage is less than specific threshold, determine that symmetrical cataclysm failure occurs for power network.
The cataclysm degree of power network can be determined by positive sequence fundametal compoment of the ac voltage of power network under dq coordinate systems.
When positive sequence fundametal compoment of the ac voltage of power network under dq coordinate systems is in preset range, the failure journey of power network is determined
Spend it is shallower, be either shallow cataclysm failure, when positive sequence fundametal compoment of the ac voltage under dq coordinate systems of power network is default beyond this
During scope, determine that the fault degree of power network is relatively deep, be depth cataclysm failure.
That is, using positive sequence fundametal compoment of the ac voltage of power network under dq coordinate systems and negative sequence voltage value just
It can determine whether power network occurs the symmetrical cataclysm failure of power network, and can determine that the specially symmetrical cataclysm failure of either shallow (including either shallow
Symmetrical lifting failure and either shallow symmetrically fall failure), or symmetrically fall failure for depth.
In the prior art, it is by judging whether the rotor current of wind energy double-fed generator excessively stream or DC voltage occurs
It is no overvoltage occur to determine the need for input exchange crow bar.And the rotor current excessively stream and DC voltage of wind energy double-fed generator
Overvoltage, all it is the dynamic response of hysteresis relative to the symmetrical cataclysm failure of power network.In the present invention, existed by the ac voltage of power network
Positive sequence fundametal compoment and negative sequence voltage value under dq coordinate systems, the symmetrical cataclysm failure that power network occurs can be found as early as possible, and really
Determine cataclysm degree.
Step S4：It is double by exchanging crow bar short circuit wind energy in the case of it is determined that power network generation depth symmetrically falls failure
The rotor of generator is presented, monitors whether to meet default recovery condition afterwards.
Positive sequence fundametal compoment and negative sequence voltage value based on the ac voltage of power network under dq coordinate systems, can be in power network
The failure is found when there is symmetrical cataclysm failure as early as possible, and determines cataclysm degree, therefore corresponding processing can be taken to arrange as early as possible
Apply.Occur in the case that depth symmetrically falls failure, finding the failure as soon as possible in power network, and by exchanging crow bar short circuit wind energy
The rotor of double-fed generator, it can shorten and depth occur from power network and symmetrically fall failure stator side transient state into wind energy double feedback electric engine
Direct current magnetic linkage decays to the time needed for default value, so as to improve the speed that pusher side current transformer starts response.
Step S5：In the case of it is determined that meeting default recovery condition, excision exchange crow bar, wind energy double-feed current transformer is restarted
In pusher side current transformer.
In the case of it is determined that power network generation depth symmetrically falls failure, by exchanging crow bar short circuit wind energy double-fed generator
Rotor, so as to stator side transient DC magnetic linkage in wind energy double-fed generator of decaying, protect wind energy double-feed current transformer.In addition,
After rotor by exchanging crow bar short circuit wind energy double-fed generator, to monitor whether to meet default recovery condition, to determine to be
No excision exchange crow bar, the pusher side current transformer for restarting wind energy double-feed current transformer.
In implementation, the default recovery condition can be：Reach preset time.That is, by exchanging crow bar short circuit
At the time of the rotor of wind energy double-fed generator, start timing, when clocking value reaches preset time, it is determined that meet default recovery bar
Part, excision exchange crow bar is performed, restart the operation of the pusher side current transformer in wind energy double-feed current transformer.
As a kind of preferred embodiment, the default recovery condition can be：The electric current for flowing through exchange crow bar is less than current settings
Value.That is, after the rotor by exchanging crow bar short circuit wind energy double-fed generator, detection in real time flows through exchange crow bar
Electric current, when it is determined that the electric current for flowing through exchange crow bar is less than current setting value, it is determined that meeting default recovery condition, performs excision and hand over
Crow bar is flowed, restarts the operation of the pusher side current transformer in wind energy double-feed current transformer.
Step S6：Determine the referenced reactive current value and watt current command value of the rotor of wind energy double-fed generator.
Specifically, the electricity according to the rotor of the load current value of pusher side current transformer and wind energy double-fed generator during transient state
Press perunit value, calculated according to the first preset algorithm wind energy double-fed generator rotor referenced reactive current value, it is double according to wind energy
Present watt current of the rotor of generator before symmetrical cataclysm failure occurs for power network, determining the rotor of wind energy double-fed generator has
Work(current instruction value.
Step S7：The transient DC component in wind energy double-fed generator stator current is extracted, it is straight using the transient state extracted
Flow component is modified to the referenced reactive current value and watt current command value of the rotor of wind energy double-fed generator, is obtained idle
Given value of current value and watt current set-point.
Step S8：Electricity is carried out to the rotor of wind energy double-fed generator using reactive current set-point and watt current set-point
Flow closed-loop control.
The reactive current obtained in step S6 is referred to using the transient DC component in wind energy double-fed generator stator current
Make value and watt current command value be modified, obtain reactive current set-point and watt current set-point, afterwards using idle
Given value of current value and watt current set-point carry out closed-loop current control to the rotor of wind energy double-fed generator.
When symmetrical cataclysm failure occurs for power network, the stator side of wind energy double-fed generator induces transient DC magnetic linkage, profit
Referenced reactive current value and watt current command value are carried out with the transient DC component in wind energy double-fed generator stator current
Amendment, based on reactive current set-point caused by the makeover process and watt current set-point, with reference to for wind energy doubly-fed generation
The closed-loop current control of the rotor of machine, the decay of stator side transient DC magnetic linkage in wind energy double-fed generator can be accelerated, improved
The reactive current response speed of wind energy double-fed generator.
The control method of wind power generation system disclosed by the invention, the ac voltage of the power network detected is quiet from two-phase
Only coordinate system is transformed under dq coordinate systems, afterwards the positive sequence fundametal compoment and negative phase-sequence electricity using ac voltage under dq coordinate systems
Pressure value determines electric network state, it is determined that power network occurs in the case that depth symmetrically falls failure, by exchanging crow bar short circuit wind energy
The rotor of double-fed generator, with the transient state magnetic linkage for wind energy double feedback electric engine of decaying, when it is determined that meeting default recovery condition, excision is handed over
Crow bar is flowed, restarts the pusher side current transformer in wind energy double-feed current transformer, determines the idle electricity of the rotor of wind energy double-fed generator afterwards
Command value and watt current command value are flowed, using the transient DC component in wind energy double-fed generator stator current to reactive current
Command value and watt current command value are modified, the reactive current set-point and watt current set-point pair obtained using amendment
The rotor of wind energy double-fed generator carries out closed-loop current control.
In the control method of wind power generation system disclosed by the invention, using the ac voltage of power network under dq coordinate systems
Positive sequence fundametal compoment and negative sequence voltage value determine electric network state, symmetrical cataclysm in power network can be occurred based on the processing mode therefore
The failure is found during barrier as early as possible, corresponding treatment measures can be used as early as possible, the feelings that depth symmetrically falls failure occurs in power network
, can be as early as possible by exchanging the rotor of crow bar short circuit wind energy double-fed generator under condition, so as to shorten from power network, depth occur symmetrical
Fall failure stator side transient DC magnetic linkage into wind energy double feedback electric engine and decay to time needed for default value, and then improve machine
Side converter starts the speed of response；In addition, nothing used in closed-loop current control is carried out to the rotor of wind energy double-fed generator
Work(given value of current value and watt current set-point, it is to utilize the transient DC component in wind energy double-fed generator stator current to wind
The referenced reactive current value and watt current command value of the rotor of energy double-fed generator are modified what is obtained, therefore can accelerate
The decay of stator side transient DC magnetic linkage in wind energy double-fed generator, improve the reactive current response speed of wind energy double-fed generator
Degree.
Referring to Fig. 2, Fig. 2 is the flow chart of the control method of another wind power generation system disclosed by the invention.In Fig. 1 institutes
Show that control method is compared, it is true using positive sequence fundametal compoment and negative sequence voltage value of the ac voltage under dq coordinate systems in step S3
After determining electric network state, in addition to：
Step S9：In the case of it is determined that the symmetrical cataclysm failure of either shallow occurs for power network, turning for wind energy double-fed generator is determined
The referenced reactive current value and watt current command value of son.
Specifically, the electricity according to the rotor of the load current value of pusher side current transformer and wind energy double-fed generator during transient state
Press perunit value, calculated according to the first preset algorithm wind energy double-fed generator rotor referenced reactive current value, it is double according to wind energy
Present watt current of the rotor of generator before symmetrical cataclysm failure occurs for power network, determining the rotor of wind energy double-fed generator has
Work(current instruction value.
Step S10：The transient DC component in wind energy double-fed generator stator current is extracted, it is straight using the transient state extracted
Flow component is modified to the referenced reactive current value and watt current command value of the rotor of wind energy double-fed generator, is obtained idle
Given value of current value and watt current set-point.
Step S11：The rotor of wind energy double-fed generator is carried out using reactive current set-point and watt current set-point
Closed-loop current control.
Based on the control method shown in Fig. 2, in the case of it is determined that symmetrical cataclysm failure occurs in power network, according to line voltage
Cataclysm amplitude use different control strategies, if the symmetrical cataclysm failure of either shallow occurs in power network, control wind energy doubly-fed generation
Machine continues to provide reactive power support to power network, and carries out the idle of closed-loop current control use to the rotor of wind energy double-fed generator
Given value of current value and watt current set-point, it is to utilize the transient DC component in wind energy double-fed generator stator current to wind energy
The referenced reactive current value and watt current command value of the rotor of double-fed generator are modified what is obtained, therefore wind energy double-fed is sent out
Motor can rapidly provide the reactive current needed for power network compensation；If depth, which occurs, in power network symmetrically falls failure, based on Fig. 2
Shown method, it is possible to increase the reactive current response speed of wind energy double-fed generator.
In the control method shown in Fig. 1 and Fig. 2, the rotor according to wind energy double-fed generator in step S6 and step S9
Watt current before symmetrical cataclysm failure occurs for power network, the watt current command value of the rotor of wind energy double-fed generator is determined,
Can be in the following way：
Using watt current of the rotor of wind energy double-fed generator before symmetrical cataclysm failure occurs for power network as wind energy double-fed
The watt current command value of the rotor of generator.
In addition, in the control method shown in Fig. 1 and Fig. 2, the volume according to pusher side current transformer in step S6 and step S9
Determine voltage perunit value of the rotor of current value and wind energy double-fed generator during transient state, calculate wind energy according to the first preset algorithm
The referenced reactive current value of the rotor of double-fed generator, can be in the following way：
When power network generation transient state is fallen, according to formula irq_ref=1.3* (0.9-Un)*IrDetermine wind energy double-fed generator
Rotor referenced reactive current value；
When transient state lifting occurs for power network, according to formula irq_ref=1.3* (1.1-Un)*IrDetermine wind energy double-fed generator
Rotor referenced reactive current value；
Wherein, irq_refFor the referenced reactive current value of the rotor of wind energy double-fed generator, UnFor wind energy double-fed generator
Voltage perunit value of the rotor during transient state, IrFor the load current value of pusher side current transformer.
In addition, in the control method shown in Fig. 1 and Fig. 2, step S7 and step S10 extraction wind energy doubly-fed generation machine stators
Transient DC component in electric current, the reactive current using the transient DC component extracted to the rotor of wind energy double-fed generator
Command value and watt current command value are modified, and obtain reactive current set-point and watt current set-point, can be used such as
Under type：
The transient DC d axis components in wind energy double-fed generator stator current are extracted, transient DC d axis components are converted into
The quantized value i of rotor currentrd_s；
The transient DC q axis components in wind energy double-fed generator stator current are extracted, transient DC q axis components are converted into
The quantized value i of rotor currentrq_s；
According to formula irq_ref'=irq_ref-k*ird_sTo the referenced reactive current value of the rotor of wind energy double-fed generator
irq_refIt is modified, obtains reactive current set-point irq_ref′；
According to formula ird_ref'=ird_ref+k*irq_sTo the watt current command value of the rotor of wind energy double-fed generator
ird_refIt is modified, obtains watt current set-point ird_ref′；
Wherein, k is the damping gain coefficient of the transient state component of wind energy double-fed generator.
As a kind of preferred embodiment, according to above-mentioned formula to the referenced reactive current value of the rotor of wind energy double-fed generator and
After watt current command value is modified, it is ensured that revised reactive current set-point irq_ref' and watt current set-point
ird_ref' in the range of capacity of pusher side current transformer, in such a situation it is preferred to ensure reactive current set-point irq_ref', limit
Watt current set-point
If that is, watt current set-point i being calculated according to above-mentioned formulard_ref' be more thanThen watt current set-point ird_ref' specific value be
In addition, in the control method shown in Fig. 1 and Fig. 2, in step S8 and step S11 using reactive current set-point and
Watt current set-point carries out closed-loop current control to the rotor of wind energy double-fed generator, can be by the way of as shown in Figure 3.
Specifically include：
Calculate watt current set-point ird_ref' watt current value of feedback the i with the rotor of wind energy double-fed generatorrd
One difference, calculate reactive current set-point irq_ref' reactive current value of feedback the i with the rotor of wind energy double-fed generatorrqSecond
Difference；
Proportional integration regulation is carried out to the first difference and produces the first component, proportional integration regulation is carried out to the second difference and is produced
Second component；
Calculate the first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate second component and the second feedback quantity ω
LrirdFirst and value urq, wherein, LrFor the rotor self-induction of wind energy double-fed generator；
To the 3rd difference urdWith first and value urqCoordinate Conversion is carried out, determines the pusher side unsteady flow in wind energy double-feed current transformer
Target output voltage value u of the device under two-phase rest framerαAnd urβ, the θ in Fig. 3s1For the slip angle of wind energy double-fed generator
Degree；
Control the pusher side current transformer output target output voltage value u in wind energy double-feed current transformerrαAnd urβ。
That is, in the case of it is determined that the symmetrical cataclysm failure of either shallow occurs for power network, in subsequent execution step S11 mistake
Cheng Zhong, can be by the way of shown in Fig. 3.In the case of it is determined that power network generation depth symmetrically falls failure, in subsequent execution
, can also be by the way of shown in Fig. 3 during step S8.
As a kind of preferred embodiment, in the case of it is determined that power network generation depth symmetrically falls failure, walked in subsequent execution
, can be by the way of as shown in Figure 4 during rapid S8.
Specifically include：
Calculate watt current set-point ird_ref' watt current value of feedback the i with the rotor of wind energy double-fed generatorrd
One difference, calculate reactive current set-point irq_ref' reactive current value of feedback the i with the rotor of wind energy double-fed generatorrqSecond
Difference；
Dynamic proportion integral adjustment is carried out to the first difference and produces the first component, dynamic proportion integration is carried out to the second difference
Regulation produces second component；
Calculate the first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate second component and the second feedback quantity ω
LrirdFirst and value urq, wherein, LrFor the rotor self-induction of wind energy double-fed generator；
To the 3rd difference urdWith first and value urqCoordinate Conversion is carried out, determines the pusher side unsteady flow in wind energy double-feed current transformer
Target output voltage value of the device under two-phase rest frame, the θ in Fig. 4s1For the slip angle of wind energy double-fed generator；
Control the pusher side current transformer output target output voltage value in wind energy double-feed current transformer.
In the case that power network generation depth symmetrically falls failure, after excision exchanges crow bar, restarts pusher side current transformer,
The rotor of wind energy double-fed generator is carried out using the reactive current set-point and watt current set-point of wind energy double-fed generator
During closed-loop current control, the ratio control parameter and integration control that are adjusted by rational dynamic regulation proportional integration are joined
Number, can accelerate the response speed of wind energy double-fed generator, while avoid because the lasting saturation of integration amount causes wind energy double-fed
There is overcurrent problem in the rotor of generator.
Wherein, dynamic proportion integral adjustment is carried out to the first difference and the second difference, various ways can be used.Here it is right
One of which embodiment is specifically described.
The ratio control parameter for the first difference and the second difference use during dynamic proportion integral adjustment is n*
P, the integration control parameter for the first difference and the second difference use during dynamic proportion integral adjustment are pressed from initial value
Incrementally increased according to default step-length to I.
Wherein, n is that to be more than 1, P be that pusher side current transformer in wind energy double-feed current transformer is normally transported for transient state correction factor, value
The ratio control parameter used under row state, I are to be used under the pusher side current transformer normal operating condition in wind energy double-feed current transformer
Integration control parameter.
The present invention control method of wind power generation system disclosed above, accordingly, invention additionally discloses wind power generation system
The control device of system.Below with respect to the description of the control device of wind power generation system, with the control above for wind power generation system
The description of method processed can cross-reference.
Referring to Fig. 5, Fig. 5 is a kind of structural representation of the control device of wind power generation system disclosed by the invention.The control
Device processed includes voltage detection unit 10, electric network state determining unit 20, the first control unit 30, the first command value determining unit
40th, the first command value amending unit 50 and the second control unit 60.
Wherein：
Voltage detection unit 10, for detecting the ac voltage of power network.
Electric network state determining unit 20, sat for the ac voltage detected to be transformed into dq from two-phase rest frame
Under mark system, electric network state is determined using positive sequence fundametal compoment of the ac voltage under dq coordinate systems and negative sequence voltage value.
First control unit 30, for determining that single 20 yuan determine that power network occurs depth and symmetrically falls failure in electric network state
In the case of, by exchanging the rotor of crow bar short circuit wind energy double-fed generator, monitor whether to meet default recovery condition afterwards, true
It is fixed to meet in the case of presetting recovery condition, excision exchange crow bar, restart the pusher side current transformer in wind energy double-feed current transformer.
First command value determining unit 40, become for the pusher side in restarting wind energy double-feed current transformer in the first control unit 30
After flowing device, according to voltage perunit of the rotor of the load current value of pusher side current transformer and wind energy double-fed generator during transient state
Value, according to the first preset algorithm calculate wind energy double-fed generator rotor referenced reactive current value, according to wind energy doubly-fed generation
Watt current of the rotor of machine before symmetrical cataclysm failure occurs for power network, determine the watt current of the rotor of wind energy double-fed generator
Command value.
First command value amending unit 50, for extracting the transient DC component in wind energy double-fed generator stator current,
The referenced reactive current value and watt current determined using the transient DC component extracted to the first command value determining unit 40
Command value is modified, and obtains reactive current set-point and watt current set-point.
Second control unit 60, for the reactive current set-point and active obtained using the first command value amending unit 50
Given value of current value carries out closed-loop current control to the rotor of wind energy double-fed generator.
The control device of wind power generation system disclosed by the invention, using the ac voltage of power network under dq coordinate systems
Positive sequence fundametal compoment and negative sequence voltage value determine electric network state, symmetrical cataclysm failure can occur in power network based on the processing mode
When find the failure as early as possible, corresponding treatment measures can be used as early as possible, the situation that depth symmetrically falls failure occur in power network
Under, can occur depth so as to shorten as early as possible by exchanging the rotor of crow bar short circuit wind energy double-fed generator from power network and symmetrically fall
Fall failure stator side transient DC magnetic linkage into wind energy double feedback electric engine and decay to time needed for default value, and then improve pusher side
Current transformer starts the speed of response；In addition, to idle used in the rotor progress closed-loop current control of wind energy double-fed generator
Given value of current value and watt current set-point, it is to utilize the transient DC component in wind energy double-fed generator stator current to wind energy
The referenced reactive current value and watt current command value of the rotor of double-fed generator are modified what is obtained, therefore can accelerate wind
The decay of stator side transient DC magnetic linkage in energy double-fed generator, improve the reactive current response speed of wind energy double-fed generator.
Referring to Fig. 6, Fig. 6 is the structural representation of the control device of another wind power generation system disclosed by the invention.With
Control device is compared shown in Fig. 5, is further provided with the second command value determining unit 70, the second command value amending unit 80 and
Three control units 90.Here pair illustrated with the difference of control device shown in Fig. 5 emphatically, the function of other units refers to
Text description.
Second command value determining unit 70, for determining that the symmetrical cataclysm of either shallow occurs for power network in electric network state determining unit 20
In the case of failure, according to voltage of the rotor of the load current value of pusher side current transformer and wind energy double-fed generator during transient state
Perunit value, according to the first preset algorithm calculate wind energy double-fed generator rotor referenced reactive current value, according to wind energy double-fed
Watt current of the rotor of generator before symmetrical cataclysm failure occurs for power network, determine wind energy double-fed generator rotor it is active
Current instruction value.
Second command value amending unit 80, for extracting the transient DC component in wind energy double-fed generator stator current,
The referenced reactive current value and watt current determined using the transient DC component extracted to the second command value determining unit 70
Command value is modified, and obtains reactive current set-point and watt current set-point；
3rd control unit 90, for the reactive current set-point and active obtained using the second command value amending unit 80
Given value of current value carries out closed-loop current control to the rotor of wind energy double-fed generator.
Present invention control device as shown in Figure 6, in the case of it is determined that symmetrical cataclysm failure occurs in power network, according to power network
The cataclysm amplitude of voltage uses different control strategies, if the symmetrical cataclysm failure of either shallow occurs in power network, controls wind energy double-fed
Generator continues to provide reactive power support to power network, and carries out closed-loop current control use to the rotor of wind energy double-fed generator
Reactive current set-point and watt current set-point, it is to utilize the transient DC component pair in wind energy double-fed generator stator current
The referenced reactive current value and watt current command value of the rotor of wind energy double-fed generator are modified what is obtained, therefore wind energy is double
Feedback generator can rapidly provide the reactive current needed for power network compensation.
In the control device shown in Fig. 5 of the present invention and Fig. 6, the first command value determining unit 40 is according to wind energy doubly-fed generation
Watt current of the rotor of machine before symmetrical cataclysm failure occurs for power network, determine the watt current of the rotor of wind energy double-fed generator
Command value, it is specially：Using watt current of the rotor of wind energy double-fed generator before symmetrical cataclysm failure occurs for power network as wind
The watt current command value of the rotor of energy double-fed generator.
First command value determining unit 40 is according to the load current value of pusher side current transformer and the rotor of wind energy double-fed generator
Voltage perunit value during transient state, calculate according to the first preset algorithm wind energy double-fed generator rotor referenced reactive current
Value, it is specially：According to formula irq_ref=1.3* (0.9-Un)*IrDetermine the referenced reactive current of the rotor of wind energy double-fed generator
Value；Wherein, irq_refFor the referenced reactive current value of the rotor of wind energy double-fed generator, UnFor the rotor of wind energy double-fed generator
Voltage perunit value during transient state, IrFor the load current value of pusher side current transformer.
In the control device shown in Fig. 6 of the present invention, the second command value determining unit 70 is according to wind energy double-fed generator
Watt current of the rotor before symmetrical cataclysm failure occurs for power network, determine the watt current instruction of the rotor of wind energy double-fed generator
Value, it is specially：Watt current of the rotor of wind energy double-fed generator before symmetrical cataclysm failure occurs for power network is double as wind energy
Present the watt current command value of the rotor of generator.
Second command value determining unit 70 is according to the load current value of pusher side current transformer and the rotor of wind energy double-fed generator
Voltage perunit value during transient state, calculate according to the first preset algorithm wind energy double-fed generator rotor referenced reactive current
Value, it is specially：
When power network generation transient state is fallen, according to formula irq_ref=1.3* (0.9-Un)*IrDetermine wind energy double-fed generator
Rotor referenced reactive current value；
When transient state lifting occurs for power network, according to formula irq_ref=1.3* (1.1-Un)*IrDetermine wind energy double-fed generator
Rotor referenced reactive current value；
Wherein, irq_refFor the referenced reactive current value of the rotor of wind energy double-fed generator, UnFor wind energy double-fed generator
Voltage perunit value of the rotor during transient state, IrFor the load current value of pusher side current transformer.
In addition, in the control device shown in Fig. 5 and Fig. 6, the first command value amending unit 50 extraction wind energy doubly-fed generation
Transient DC component in machine stator electric current, the first command value determining unit 40 is determined using the transient DC component extracted
Referenced reactive current value and watt current command value be modified, obtain reactive current set-point and watt current set-point,
Specially：
The transient DC d axis components in wind energy double-fed generator stator current are extracted, transient DC d axis components are converted into
The quantized value i of rotor currentrd_s；
The transient DC q axis components in wind energy double-fed generator stator current are extracted, transient DC q axis components are converted into
The quantized value i of rotor currentrq_s；
According to formula irq_ref'=irq_ref-k*ird_sThe referenced reactive current determined to the first command value determining unit 40
Value irq_refIt is modified, obtains reactive current set-point irq_ref′；
According to formula ird_ref'=ird_ref+k*irq_sThe watt current that first command value determining unit 40 determines is instructed
Value ird_refIt is modified, obtains watt current set-point ird_ref′。
Wherein, k is the damping gain coefficient of the transient state component of wind energy double-fed generator.
Preferably, the nothing that the first command value amending unit 50 determines according to above-mentioned formula to the first command value determining unit 40
After work(current instruction value and watt current command value are modified, it is ensured that revised reactive current set-point irq_ref' and
Watt current set-point ird_ref' in the range of capacity of pusher side current transformer, in such a situation it is preferred to ensure reactive current to
Definite value irq_ref', limit active given value of current value
In control device shown in Fig. 6, in the second command value amending unit 80 extraction wind energy double-fed generator stator current
Transient DC component, the reactive current determined using the transient DC component extracted to the second command value determining unit 70 referred to
Make value and watt current command value be modified, obtain reactive current set-point and watt current set-point, be specially：
The transient DC d axis components in wind energy double-fed generator stator current are extracted, transient DC d axis components are converted into
The quantized value i of rotor currentrd_s；
The transient DC q axis components in wind energy double-fed generator stator current are extracted, transient DC q axis components are converted into
The quantized value i of rotor currentrq_s；
According to formula irq_ref'=irq_ref-k*ird_sThe referenced reactive current determined to the second command value determining unit 70
Value irq_refIt is modified, obtains reactive current set-point irq_ref′；
According to formula ird_ref'=ird_ref+k*irq_sThe watt current that second command value determining unit 70 determines is instructed
Value ird_refIt is modified, obtains watt current set-point ird_ref′。
Wherein, k is the damping gain coefficient of the transient state component of wind energy double-fed generator.
Preferably, the nothing that the second command value amending unit 80 determines according to above-mentioned formula to the second command value determining unit 70
After work(current instruction value and watt current command value are modified, it is ensured that revised reactive current set-point irq_ref' and
Watt current set-point ird_ref' in the range of capacity of pusher side current transformer, in such a situation it is preferred to ensure reactive current to
Definite value irq_ref', limit active given value of current value
As a kind of embodiment, in the control device shown in Fig. 6, the 3rd control unit 90 is repaiied using the second command value
The reactive current set-point and watt current set-point that positive unit 80 obtains carry out electric current to the rotor of wind energy double-fed generator and closed
Ring controls, and is specially：
Calculate the watt current set-point i of the second command value amending unit 80 acquisitionrd_ref' and wind energy double-fed generator
The watt current value of feedback i of rotorrdThe first difference, calculate the second command value amending unit 80 obtain reactive current set-point
irq_ref' reactive current value of feedback the i with the rotor of wind energy double-fed generatorrqThe second difference；
Proportional integration regulation is carried out to the first difference and produces the first component, proportional integration regulation is carried out to the second difference and is produced
Second component；
Calculate the first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate second component and the second feedback quantity ω
LrirdFirst and value urq, wherein, LrFor the rotor self-induction of wind energy double-fed generator；
To the 3rd difference urdWith first and value urqCoordinate Conversion is carried out, determines the pusher side unsteady flow in wind energy double-feed current transformer
Target output voltage value of the device under two-phase rest frame；
Control the pusher side current transformer output target output voltage value in wind energy double-feed current transformer.
As a kind of embodiment, in the control device shown in Fig. 5 and Fig. 6, the second control unit 60 refers to using first
The reactive current set-point and watt current set-point for making the acquisition of value amending unit 50 are carried out to the rotor of wind energy double-fed generator
Closed-loop current control, it is specially：
Calculate the watt current set-point i of the first command value amending unit 50 acquisitionrd_ref' and wind energy double-fed generator
The watt current value of feedback i of rotorrdThe first difference, calculate the first command value amending unit 50 obtain reactive current set-point
irq_ref' reactive current value of feedback the i with the rotor of wind energy double-fed generatorrqThe second difference；
Dynamic proportion integral adjustment is carried out to the first difference and produces the first component, dynamic proportion integration is carried out to the second difference
Regulation produces second component；
Calculate the first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate second component and the second feedback quantity ω
LrirdFirst and value urq, wherein, LrFor the rotor self-induction of wind energy double-fed generator；
To the 3rd difference urdWith first and value urqCoordinate Conversion is carried out, determines the pusher side unsteady flow in wind energy double-feed current transformer
Target output voltage value of the device under two-phase rest frame；
Control the pusher side current transformer output target output voltage value in wind energy double-feed current transformer.
Wherein, the second control unit 60 carries out dynamic proportion integral adjustment to the first difference and the second difference, can use
Various ways.Here one of which embodiment is specifically described.
The ratio that second control unit 60 to the first difference and the second difference use during dynamic proportion integral adjustment
Example control parameter is n*P, the integration control for the first difference and the second difference use during dynamic proportion integral adjustment
Parameter is incrementally increased to I from initial value according to default step-length, wherein, n is that transient state correction factor, value more than 1, P are that wind energy is double
The ratio control parameter used under pusher side current transformer normal operating condition in feedback current transformer, I are in wind energy double-feed current transformer
The integration control parameter used under pusher side current transformer normal operating condition；
Finally, it is to be noted that, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of elements not only include that
A little key elements, but also the other element including being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except other identical element in the process including the key element, method, article or equipment being also present.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (12)
1. a kind of control method of wind power generation system, the wind power generation system includes wind energy double-fed generator and wind energy double-fed
Current transformer, it is characterised in that the control method includes：
Detect the ac voltage of power network；
The ac voltage detected is transformed under dq coordinate systems from two-phase rest frame；
Electric network state is determined using positive sequence fundametal compoment of the ac voltage under dq coordinate systems and negative sequence voltage value；
In the case of it is determined that power network generation depth symmetrically falls failure, by exchanging wind energy double-fed generator described in crow bar short circuit
Rotor, monitor whether to meet default recovery condition afterwards；
In the case of it is determined that meeting default recovery condition, excision exchange crow bar, the machine in the wind energy double-feed current transformer is restarted
Side converter；
According to voltage of the rotor of the load current value of the pusher side current transformer and the wind energy double-fed generator during transient state
Perunit value, the referenced reactive current value of the rotor of the wind energy double-fed generator is calculated according to the first preset algorithm, according to described
Watt current of the rotor of wind energy double-fed generator before symmetrical cataclysm failure occurs for power network, determines the wind energy double-fed generator
Rotor watt current command value；
The transient DC component in the wind energy double-fed generator stator current is extracted, utilizes the transient DC component pair extracted
The referenced reactive current value and watt current command value of the rotor of the wind energy double-fed generator are modified, and obtain reactive current
Set-point and watt current set-point；
The rotor of the wind energy double-fed generator is carried out using the reactive current set-point and the watt current set-point
Closed-loop current control.
2. control method according to claim 1, it is characterised in that described to utilize the ac voltage in dq coordinate systems
Under positive sequence fundametal compoment and negative sequence voltage value determine electric network state after, in addition to：
In the case of it is determined that the symmetrical cataclysm failure of either shallow occurs for power network, according to the load current value of the pusher side current transformer and institute
Voltage perunit value of the rotor of wind energy double-fed generator during transient state is stated, the wind energy double-fed is calculated according to the first preset algorithm
The referenced reactive current value of the rotor of generator, symmetrical cataclysm event is occurred in power network according to the rotor of the wind energy double-fed generator
Watt current before barrier, determine the watt current command value of the rotor of the wind energy double-fed generator；
The transient DC component in the wind energy double-fed generator stator current is extracted, utilizes the transient DC component pair extracted
The referenced reactive current value and watt current command value of the rotor of the wind energy double-fed generator are modified, and obtain reactive current
Set-point and watt current set-point；
The rotor of the wind energy double-fed generator is carried out using the reactive current set-point and the watt current set-point
Closed-loop current control.
3. control method according to claim 1 or 2, it is characterised in that
Watt current of the rotor according to the wind energy double-fed generator before symmetrical cataclysm failure occurs for power network, determines institute
The watt current command value of the rotor of wind energy double-fed generator is stated, including：By the rotor of the wind energy double-fed generator in power network
Watt current command value of the watt current before symmetrical cataclysm failure as the rotor of the wind energy double-fed generator occurs；
It is described according to the load current value of the pusher side current transformer and the rotor of the wind energy double-fed generator during transient state
Voltage perunit value, the referenced reactive current value of the rotor of the wind energy double-fed generator is calculated according to the first preset algorithm, including：
When power network generation transient state is fallen, according to formula irq_ref=1.3* (0.9-Un)*IrDetermine the wind energy double-fed hair
The referenced reactive current value of the rotor of motor；
When transient state lifting occurs for the power network, according to formula irq_ref=1.3* (1.1-Un)*IrDetermine the wind energy double-fed hair
The referenced reactive current value of the rotor of motor；
Wherein, irq_refFor the referenced reactive current value of the rotor of the wind energy double-fed generator, UnFor the wind energy doubly-fed generation
Voltage perunit value of the rotor of machine during transient state, IrFor the load current value of the pusher side current transformer.
4. control method according to claim 1 or 2, it is characterised in that the extraction wind energy double-fed generator is determined
Transient DC component in electron current, the nothing using the transient DC component extracted to the rotor of the wind energy double-fed generator
Work(current instruction value and watt current command value are modified, and obtain reactive current set-point and watt current set-point, including：
The transient DC d axis components in the wind energy double-fed generator stator current are extracted, the transient DC d axis components are rolled over
Synthesize the quantized value i of rotor currentrd_s；
The transient DC q axis components in the wind energy double-fed generator stator current are extracted, the transient DC q axis components are rolled over
Synthesize the quantized value i of rotor currentrq_s；
According to formula irq_ref'=irq_ref-k*ird_sTo the referenced reactive current value of the rotor of the wind energy double-fed generator
irq_refIt is modified, obtains reactive current set-point irq_ref′；
According to formula ird_ref'=ird_ref+k*irq_sTo the watt current command value of the rotor of the wind energy double-fed generator
ird_refIt is modified, obtains watt current set-point ird_ref′；
Wherein, k is the damping gain coefficient of the transient state component of the wind energy double-fed generator.
5. control method according to claim 2, it is characterised in that it is determined that the symmetrical cataclysm failure of either shallow occurs for power network
In the case of, the rotor of the wind energy double-fed generator is entered using the reactive current set-point and the watt current set-point
Row closed-loop current control, including：
Calculate the watt current set-point ird_ref' watt current value of feedback the i with the rotor of the wind energy double-fed generatorrd
The first difference, calculate the reactive current set-point irq_ref' anti-with the reactive current of the rotor of the wind energy double-fed generator
Feedback value irqThe second difference；
Proportional integration regulation is carried out to first difference and produces the first component, proportional integration regulation is carried out to second difference
Produce second component；
Calculate first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate the second component and the second feedback
Measure ω LrirdFirst and value urq, wherein, LrFor the rotor self-induction of the wind energy double-fed generator；
To the 3rd difference urdWith described first and value urqCoordinate Conversion is carried out, determines the machine in the wind energy double-feed current transformer
Target output voltage value of the side converter under two-phase rest frame；
The pusher side current transformer in the wind energy double-feed current transformer is controlled to export the target output voltage value.
6. control method according to claim 1 or 2, it is characterised in that it is determined that the symmetrical cataclysm event of depth occurs for power network
In the case of barrier, the wind energy double-fed generator is turned using the reactive current set-point and the watt current set-point
Son carries out closed-loop current control, including：
Calculate the watt current set-point ird_ref' watt current value of feedback the i with the rotor of the wind energy double-fed generatorrd
The first difference, calculate the reactive current set-point irq_ref' anti-with the reactive current of the rotor of the wind energy double-fed generator
Feedback value irqThe second difference；
Dynamic proportion integral adjustment is carried out to first difference and produces the first component, dynamic proportion is carried out to second difference
Integral adjustment produces second component；Wherein, dynamic proportion integral adjustment mistake is carried out to first difference and second difference
The ratio control parameter used in journey is n*P, and dynamic proportion integral adjustment is carried out to first difference and second difference
During the integration control parameter that uses incrementally increased from initial value according to default step-length to I, wherein, n be transient state correction factor,
It is the ratio control ginseng used under the pusher side current transformer normal operating condition in the wind energy double-feed current transformer that value, which is more than 1, P,
Number, I are the integration control parameter used under the pusher side current transformer normal operating condition in the wind energy double-feed current transformer；
Calculate first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate the second component and the second feedback
Measure ω LrirdFirst and value urq, wherein, LrFor the rotor self-induction of the wind energy double-fed generator；
To the 3rd difference urdWith described first and value urqCoordinate Conversion is carried out, determines the machine in the wind energy double-feed current transformer
Target output voltage value of the side converter under two-phase rest frame；
The pusher side current transformer in the wind energy double-feed current transformer is controlled to export the target output voltage value.
7. a kind of control device of wind power generation system, the wind power generation system includes wind energy double-fed generator and wind energy double-fed
Current transformer, it is characterised in that the control device includes：
Voltage detection unit, for detecting the ac voltage of power network；
Electric network state determining unit, for the ac voltage detected to be transformed into dq coordinate systems from two-phase rest frame
Under, determine electric network state using positive sequence fundametal compoment of the ac voltage under dq coordinate systems and negative sequence voltage value；
First control unit, for determining that the situation that depth symmetrically falls failure occurs for power network in the electric network state determining unit
Under, by exchanging the rotor of wind energy double-fed generator described in crow bar short circuit, monitor whether to meet default recovery condition afterwards, true
It is fixed to meet in the case of presetting recovery condition, excision exchange crow bar, restart the pusher side current transformer in the wind energy double-feed current transformer；
First command value determining unit, become for the pusher side in restarting the wind energy double-feed current transformer in first control unit
After flowing device, according to the rotor of the load current value of the pusher side current transformer and the wind energy double-fed generator during transient state
Voltage perunit value, the referenced reactive current value of the rotor of the wind energy double-fed generator is calculated according to the first preset algorithm, according to
Watt current of the rotor of the wind energy double-fed generator before symmetrical cataclysm failure occurs for power network, determine the wind energy double-fed hair
The watt current command value of the rotor of motor；
First command value amending unit, for extracting the transient DC component in the wind energy double-fed generator stator current, profit
The referenced reactive current value and watt current determined with the transient DC component extracted to the first command value determining unit
Command value is modified, and obtains reactive current set-point and watt current set-point；
Second control unit, for the reactive current set-point and described active obtained using the first command value amending unit
Given value of current value carries out closed-loop current control to the rotor of the wind energy double-fed generator.
8. control device according to claim 7, it is characterised in that also include：
Second command value determining unit, for it is determined that power network occur the symmetrical cataclysm failure of either shallow in the case of, according to the machine
Voltage perunit value of the rotor of the load current value of side converter and the wind energy double-fed generator during transient state, according to first
Preset algorithm calculates the referenced reactive current value of the rotor of the wind energy double-fed generator, according to the wind energy double-fed generator
Watt current of the rotor before symmetrical cataclysm failure occurs for power network, determine the watt current of the rotor of the wind energy double-fed generator
Command value；
Second command value amending unit, for extracting the transient DC component in the wind energy double-fed generator stator current, profit
The referenced reactive current value and watt current determined with the transient DC component extracted to the second command value determining unit
Command value is modified, and obtains reactive current set-point and watt current set-point；
3rd control unit, for the reactive current set-point and described active obtained using the second command value amending unit
Given value of current value carries out closed-loop current control to the rotor of the wind energy double-fed generator.
9. control device according to claim 8, it is characterised in that
The first command value determining unit and the second command value determining unit turn according to the wind energy double-fed generator
Watt current of the son before symmetrical cataclysm failure occurs for power network, determines that the watt current of the rotor of the wind energy double-fed generator refers to
Value is made, is specially：Using watt current of the rotor of the wind energy double-fed generator before symmetrical cataclysm failure occurs for power network as
The watt current command value of the rotor of the wind energy double-fed generator；
The first command value determining unit and the second command value determining unit are according to the specified electricity of the pusher side current transformer
Voltage perunit value of the rotor of flow valuve and the wind energy double-fed generator during transient state, according to described in the calculating of the first preset algorithm
The referenced reactive current value of the rotor of wind energy double-fed generator, it is specially：When power network generation transient state is fallen, according to formula
irq_ref=1.3* (0.9-Un)*IrDetermine the referenced reactive current value of the rotor of the wind energy double-fed generator；In the power network
During generation transient state lifting, according to formula irq_ref=1.3* (1.1-Un)*IrDetermine the nothing of the rotor of the wind energy double-fed generator
Work(current instruction value；Wherein, irq_refFor the referenced reactive current value of the rotor of the wind energy double-fed generator, UnFor the wind
Voltage perunit value of the rotor of energy double-fed generator during transient state, IrFor the load current value of the pusher side current transformer.
10. control device according to claim 8, it is characterised in that
The first command value amending unit extracts the transient DC component in the wind energy double-fed generator stator current, utilizes
The referenced reactive current value and watt current that the transient DC component extracted determines to the first command value determining unit refer to
Make value be modified, obtain reactive current set-point and watt current set-point, be specially：
The transient DC d axis components in the wind energy double-fed generator stator current are extracted, the transient DC d axis components are rolled over
Synthesize the quantized value i of rotor currentrd_s；The transient DC q axis components in the wind energy double-fed generator stator current are extracted, will
The transient DC q axis components are converted into the quantized value i of rotor currentrq_s；According to formula irq_ref'=irq_ref-k*ird_sTo institute
State the referenced reactive current value i of the first command value determining unit determinationrq_refIt is modified, obtains reactive current set-point
irq_ref′；According to formula ird_ref'=ird_ref+k*irq_sThe watt current that the first command value determining unit determines is instructed
Value ird_refIt is modified, obtains watt current set-point ird_ref′；
The second command value amending unit extracts the transient DC component in the wind energy double-fed generator stator current, utilizes
The referenced reactive current value and watt current that the transient DC component extracted determines to the second command value determining unit refer to
Make value be modified, obtain reactive current set-point and watt current set-point, be specially：
The transient DC d axis components in the wind energy double-fed generator stator current are extracted, the transient DC d axis components are rolled over
Synthesize the quantized value i of rotor currentrd_s；The transient DC q axis components in the wind energy double-fed generator stator current are extracted, will
The transient DC q axis components are converted into the quantized value i of rotor currentrq_s；According to formula irq_ref'=irq_ref-k*ird_sTo institute
State the referenced reactive current value i of the second command value determining unit determinationrq_refIt is modified, obtains reactive current set-point
irq_ref′；According to formula ird_ref'=ird_ref+k*irq_sThe watt current that the second command value determining unit determines is instructed
Value ird_refIt is modified, obtains watt current set-point ird_ref′；
Wherein, k is the damping gain coefficient of the transient state component of the wind energy double-fed generator.
11. control device according to claim 8, it is characterised in that the 3rd control unit refers to using described second
The reactive current set-point and the watt current set-point for making the acquisition of value amending unit turn to the wind energy double-fed generator
Son carries out closed-loop current control, is specially：
Calculate the watt current set-point i that the second command value amending unit obtainsrd_ref' and the wind energy double-fed generator
Rotor watt current value of feedback irdThe first difference, calculate the reactive current that the second command value amending unit obtains and give
Definite value irq_ref' reactive current value of feedback the i with the rotor of the wind energy double-fed generatorrqThe second difference；
Proportional integration regulation is carried out to first difference and produces the first component, proportional integration regulation is carried out to second difference
Produce second component；
Calculate first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate the second component and the second feedback
Measure ω LrirdFirst and value urq, wherein, LrFor the rotor self-induction of the wind energy double-fed generator；
To the 3rd difference urdWith described first and value urqCoordinate Conversion is carried out, determines the machine in the wind energy double-feed current transformer
Target output voltage value of the side converter under two-phase rest frame；
The pusher side current transformer in the wind energy double-feed current transformer is controlled to export the target output voltage value.
12. the control device according to claim 7 or 8, it is characterised in that second control unit utilizes described first
The reactive current set-point and the watt current set-point that command value amending unit obtains are to the wind energy double-fed generator
Rotor carries out closed-loop current control, is specially：
Calculate the watt current set-point i that the first command value amending unit obtainsrd_ref' and the wind energy double-fed generator
Rotor watt current value of feedback irdThe first difference, calculate the reactive current that the first command value amending unit obtains and give
Definite value irq_ref' reactive current value of feedback the i with the rotor of the wind energy double-fed generatorrqThe second difference；
Dynamic proportion integral adjustment is carried out to first difference and produces the first component, dynamic proportion is carried out to second difference
Integral adjustment produces second component；Wherein, dynamic proportion integral adjustment mistake is carried out to first difference and second difference
The ratio control parameter used in journey is n*P, and dynamic proportion integral adjustment is carried out to first difference and second difference
During the integration control parameter that uses incrementally increased from initial value according to default step-length to I, wherein, n be transient state correction factor,
It is the ratio control ginseng used under the pusher side current transformer normal operating condition in the wind energy double-feed current transformer that value, which is more than 1, P,
Number, I are the integration control parameter used under the pusher side current transformer normal operating condition in the wind energy double-feed current transformer；
Calculate first component and the first feedback quantity ω LrirqThe 3rd difference urd, calculate the second component and the second feedback
Measure ω LrirdFirst and value urq, wherein, LrFor the rotor self-induction of the wind energy double-fed generator；
To the 3rd difference urdWith described first and value urqCoordinate Conversion is carried out, determines the machine in the wind energy double-feed current transformer
Target output voltage value of the side converter under two-phase rest frame；
The pusher side current transformer in the wind energy double-feed current transformer is controlled to export the target output voltage value.
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| CN107658913B (en) * | 2017-10-26 | 2019-11-29 | 阳光电源股份有限公司 | A kind of control method and device of double-fed generator unbalance grid failure |
| CN112383252B (en) * | 2020-10-30 | 2022-05-06 | 华北电力科学研究院有限责任公司 | Per unit method and device for double-fed generator set excitation control system |
| CN114256883B (en) * | 2021-11-25 | 2023-10-03 | 中国华能集团清洁能源技术研究院有限公司 | Control method and device of doubly-fed wind turbine generator and electronic equipment |
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| CN102214931B (en) * | 2011-05-24 | 2014-06-11 | 浙江大学 | Device and method for low voltage ride through of double-fed inductive wind power generator system |
| CN104113077B (en) * | 2014-06-30 | 2016-01-20 | 浙江大学 | A kind of control method for coordinating of dual-feed asynchronous wind power generator high voltage crossing |
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