CN104716666B - For being detached from the control strategy of the double fed induction generators wind power system of linear power grid - Google Patents
For being detached from the control strategy of the double fed induction generators wind power system of linear power grid Download PDFInfo
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Abstract
The present invention provides a kind of controller for being used for double fed induction generators (DFIG) system.In various embodiments, the system comprises double fed induction generators, back-to-back formula converter and controllers.The DFIG includes: rotor-side converter；Direct-current chain, the direct-current chain have at least one capacitor and couple with the output of the rotor-side converter；And line side converter, the output of the line side converter and the direct-current chain couple.The controller is configured to control the inductor of the power of back-to-back formula converter, the hot property of DFIG and the rotor-side converter and line side converter, to eliminate the overvoltage in the direct-current chain, and reduces and overrun due to what island effect event generated.
Description
Technical field
The present invention relates generally to double fed induction generators fields.It is sent out it is more particularly related to be suitable for wind-force
The double fed induction generators of motor.
Background technique
In recent years, the reduction with the supply of the fossil energies such as petroleum and coal and price needed for restoring these fossil energies
With the increase of labor intensity so that for example, the alternative energy sources such as wind energy generated by wind-driven generator are for meeting to electric energy not
It is become more and more popular for increased demand of breaking.Wind-driven generator is a kind of type based on renewable energy for Denso
It sets, can be competed with traditional forms of electricity generation.Therefore, wind-driven generator obtain wind energy and with it is cost-benefit, can
It leans on and the mode of safety transforms wind energy into electric energy, be adapted to be transferred to thousands of miles away.
In operation, wind-driven generator may include multiple rotating vanes, and the rotating vane is connected on armature spindle simultaneously
And it is rotated by wind.Blade can make armature spindle spin by the rotation that wind carries out, and drive one or more power generations to generate
The rotation torque or rotary force of machine, so that mechanical energy is converted to electric energy.Armature spindle or generator are mounted on truss or pipe
In shell or cabin on the top of shape tower.The electric energy generated in the cabin is passed down through tower via transformer and is distributed to altogether
Electricity consumption is online.
Wind energy have several applications, these application ranges from be interconnected on utility network and by electric energy be transmitted to share electricity
Online large wind power generation airport, which is arrived, can be carried out power grid connection or may be without the wind-force of power grid connection being individually isolated
Generator.Therefore, wind-driven generator can be used for may be coupled to for single family or building power generation or wind-driven generator
On power grid, it to be used for wider electric power distribution.Wind-driven generator to power grid interconnection can with device-based size, to total electricity
The size for supplying the contribution of (wind-force penetrates (wind penetration)) is divided into different classes of, is for frequency function but regardless of electricity
Rate or reactive power, and the degree of integration with other power supplys.
It is traditional for enhancing the routine of transient stability of network system for the network system integrated with wind-driven generator
Scheme is to be interconnected to speed-changing wind power generator (rather than wind-driven generator of fixed speed) using double fed induction generators
In system.DFIG usually has more ideal characterisiticses for power grid integration.Typically, DFIG is used for variable speed generation (VSG) system
In system, to generate electric energy from the intermittent energy sources such as wind power plant or variable energy source.
Compared with the system of fixed speed, a major advantage of variable speed generation system is that speed-changing wind power generator can
More energy are obtained with the wind-driven generator than fixed speed, because depending on wind speed, speed-changing wind power generator can be with most
Good rotation speed operation, the pneumatic efficiency highest of wind wheel under best rotation speed.It has therefore proved that DFIG technology is speed change wind
One kind of power generator is effectively and with cost-benefit solution.DFIG is currently in megawatt range for wind-power electricity generation
The most widely used generator type of machine system.
It is shown in Fig. 1 as its efficiency and reliability and the basic configuration of the DFIG used in large-scale application.
The main component of representative DFIG system is: the stator being connected on utility network；The correlation being connected on wind-driven generator turns
Son；Across the rotor electrical connector of slip ring；Rotor-side converter；Line side converter；Connect the direct-current chain of two converters；
And the controller for converter.It is sent out for example, Fig. 1 illustrates to be couple to the wind-force for electric power distribution on utility network 12
Motor 10, and the wind-driven generator 14 including being couple on DFIG18.DFIG18 includes DFIG generator 19, the DFIG hair
Motor includes rotor 16 and stator 20.
Rotor 16 provides rotor windings 22, exchanges function for transmitting between rotor 16 and back-to-back formula DFIG converter 24
Rate.Stator 20 has the stator winding 26 being couple on power grid 12.Converter 24 is back-to-back formula structure, which includes: to turn
Sub- side converter (RSC) circuit 28；DC intermediate circuit 30, the circuit provide the DC bus (DB) with capacitor C；And route
Side converter circuit 32.Line side converter (LSC) circuit 32 is coupled between stator winding 26 and DC intermediate circuit 30.
Some DFIG wind power systems are by long cable connection to power network.If circuit disconnects during operation, for example, by
Caused by the disconnection of switch, breaker or fuse, then the circuit and the wind-driven generator of operation will separate simultaneously with power grid
And form earth-free electric system.This is known as " island effect ".Alternator speed and line side voltage all will be increased quickly, because
Blade rotation function will be become by the wind energy that network re-active power output channel is cut off and blade absorbs.It is being not connected to
In the case where power grid, turbine can not export energy.Since the voltage in line side is higher, direct-current chain can be uncontrolled
In the state of charge.
If line side continues to generate electricity, direct-current chain capacitor will be by overcharge.This can cause converter DC chain
Overvoltage, in some instances it may even be possible to can burn IGBT or occur IGBT explosion.Therefore, electric network fault needs generator to stop generating energy
Amount, this also means that no longer having the inhibition torque of control blade velocity.
In wind-driven generator, if DFIG is run in the state of being more than synchronizing speed, this will be so that generator enters
Overspeed condition because blade system can due to blade generate aerodynamic moment and accelerate.Therefore, island effect can produce in equipment
Raw huge pressure, including the high voltage in rotor-side, this be for maintenance personal it is breakneck, because of maintenance personal
The part for the electric system being still powered on may be inadvertently contacted.This is usually to cause a severely injured or even dead problem
Place.
Thus, for example safety, reliability, cost and holding are transmitted to many reasons such as power quality of user in public affairs
It is stood out in the angle for preventing island effect in facility.Therefore, when there are island effect situation, need to implement anti-isolated island
Effect program.
In order to protect the sensing unit of DFIG wind-driven generator and mitigate seriously affecting for island effect, for example, due to
Electric network fault causes, and conventional solution is using the DFIG with extinguishing arc electric power, as shown in Figure 1.Crowbar circuit 34 couples
Between rotor 16 and rotor-side converter 28.
Crowbar circuit 34 is opened by full wave bridge rectifier, power resistor and insulation gate pole bipolar junction transistor (IGBT)
It closes.Network voltage decline during, in order to prevent RSC28 due to the overcurrent in rotor circuit or the overvoltage in direct-current chain and
Cause to trip, crowbar switch 34 is connected on the rotor windings 22 of DFIG18.During normal operation, crowbar switch 34 is to disconnect
's.Initially during electric network fault, sensor (not shown) detects overvoltage.Then, controller (not shown) triggers extinguishing arc
Circuit 34 implements control strategy to reduce overvoltage, to protect DFIG wind power system.
In order to make the rotor current in crowbar circuit 34 change direction, 16 overcurrent of rotor or direct-current chain can be being detected
Switch 34 is activated after overvoltage, wherein energy is dissipated in the resistors, so that high current peak value is successfully far from rotor
Side converter 28 changes direction, to prevent rotor 16 and back-to-back 24 component of formula converter from generating excessively high voltage spikes.
Traditional crowbar circuit as shown in Figure 1 is constructed by one group of resistor, the resistor and rotor when interrupting
Winding parallel connection, to consume power or eliminate overvoltage.Crowbar circuit bypasses rotor-side converter.Effective extinguishing arc controlling party
Case connects extinguishing arc resistance when needed, and makes extinguishing arc resistance failure to restore DFIG control.Which prevent the excessively electric of IGBT
Press and can be with dissipation energy.In normal operation, switch is open and resistor is bypassed.In the situation phase of breaking down
Between, switch is closure and resistor in series is connected on rotor windings.
Accordingly, it is desirable to provide a kind of control to avoid generator production the generator system being connected on utility network
The system and method for raw unplanned property island effect.It needs further exist for providing a kind of when DFIG and power grid are disconnected or lost load
The system and method eliminated direct-current chain, the line side DFIG and overvoltage in rotor-side and reduce the risk that DFIG overruns.Also
Need to provide a kind of system and method reduced to the capacity requirement of dynamic breaker (DB).
Summary of the invention
In view of drawbacks described above, exist to the control ability and DFIG of power converter and line side and rotor-side electricity
The demand of the hot property of sensor, wherein control strategy does not need any hardware change and has saved dynamic breaker cost.This
Outside, there is also the demand to a kind of control system and method, the control system and method enhance rotor-side converter and line
The effect of trackside converter and the hot property for utilizing generator link inductor and inductor rotor device.This strategy helps to mention
The safety of high DFIG system.
In certain embodiments, a kind of controller for double fed induction generators is provided.In various embodiments, described
System includes double fed induction generators, back-to-back formula converter and controller.The DFIG includes: rotor-side converter；Directly
Chain is flowed, the direct-current chain has at least one capacitor and couples with the output of rotor-side converter；And line side converter,
The output of the line side converter and direct-current chain couples.The controller be configured to the power to back-to-back formula converter,
The hot property and rotor-side converter of DFIG and the inductor of line side converter are controlled, to eliminate the mistake in direct-current chain
Voltage and reduce overrun due to what island effect event generated.
In certain embodiments, a kind of wind-driven generator for double fed induction generators is provided.The wind-driven generator
It include: rotor blade, double fed induction generators, back-to-back formula converter and the controller for being rotated by wind.It is described
DFIG is rotatably coupled on rotor blade for generating electricity.Back-to-back formula converter includes: rotor-side converter；Direct-current chain,
The direct-current chain has at least one capacitor and couples with the output of rotor-side converter；And line side converter, it is described
The output of line side converter and direct-current chain couples.The controller is configured to power, DFIG to back-to-back formula converter
Hot property and the inductor of rotor-side converter and line side converter controlled, to eliminate the overvoltage in direct-current chain
And reduces and overrun due to what island effect event generated.
In certain embodiments, it provides a kind of for resisting island effect and being controlled wind-driven generator to prevent
The method of voltage and overspeed condition, which comprises generated electricity by the rotation of double fed induction generators；Monitor wind-power electricity generation
Connection between machine and the power transmission line of utility network；Monitor the variation of utility grid voltage；And in response to island effect event
The variation of period utility grid voltage runs controller to prevent overvoltage and overspeed condition.
It is carried out referring to the attached drawing below to other feature and advantage of every embodiment and structurally and operationally more detailed
Description.It should be noted that the present invention is not limited to the specific embodiments described in this specification.Such embodiment is merely for illustrative mesh
And present in the present specification.Those skilled in the relevant art are based on teaching included in this specification it will understand that in addition
Embodiment.
Detailed description of the invention
Fig. 1 is the block diagram of the basic configuration of DFIG wind power system；
Fig. 2 is the schematic block diagram of an example of the DFIG wind power system of every embodiment according to the present invention；
Fig. 3 is the circuit diagram of DFIG wind power system shown in Fig. 2；And
Fig. 4 is the block diagram according to an example of the controller of every embodiment；
Fig. 5 is the polar plot for describing the DFIG wind power system according to every embodiment；
Fig. 6 is the polar plot for describing the DFIG wind power system according to every embodiment；
Fig. 7 is the polar plot for describing the DFIG wind power system according to every embodiment；
Fig. 8 is the polar plot for describing the DFIG wind power system according to every embodiment；And
Fig. 9 is the flow chart for practicing the illustrative methods of one embodiment of the present invention.
The present invention can use the arrangement with various parts and component and the cloth of various processes operation and process operation
The form set.The present invention will be described in the accompanying drawings, and identical Ref. No. can indicate in each attached drawing in the accompanying drawings
Corresponding or similar portions.Attached drawing is merely to illustrate the purpose of preferred embodiment, and should not be taken as limitation of the present invention.It examines
Consider and the feasibility of attached drawing is described below, novel aspect of the invention should be obvious for those skilled in the art
's.
Specific embodiment
Following specific embodiments are only exemplary in itself, and are not limiting as disclosed in this specification
Application and use.Furthermore, it is not intended to by institute in aforementioned background art or summary of the invention or following specific embodiments
The constraint for any theory enumerated.Although implementing in this specification mainly in combination with items of the DFIG wind power system to the technology of the present invention
Example is described, but these concepts are also applied for the other kinds of wind powered generator system with converter, for example, Quan Gong
Rate converter wind power system or other similar system with converter.Other than wind driven generator technology, these concepts are also
Suitable for hydroelectric generator and solar energy.
Embodiment described in this specification includes providing the wind powered generator system of control strategy, the control strategy
By line side voltage, rotor-side voltage and DC-link voltage control to normal level.Control strategy can also prevent generator fast
Degree increases, and mode is to change rotor magnetic flux link, adjust the stand-by output power in converter line side and utilize generator
With the thermal capacitance of inductor.This control program enhances the DFIG system before closing wind-driven generator or executing electric power network recovery
The safety of system.
Therefore, some embodiments, which provide, a kind of controls to avoid hair the generator system being connected in electric system
The system and method that motor generates unplanned property island effect.Further embodiment provides a kind of in DFIG disengaging power grid or mistake
The system eliminated direct-current chain, the line side DFIG and overvoltage in rotor-side during unloading and reduce the risk that DFIG overruns
And method.Other embodiment can also provide a kind of system and method reduced to the capacity requirement of DB (dynamic breaker).
Every embodiment provides a kind of control ability for making full use of power converter and DFIG and line side rotor-side
The system and method for the hot property of inductor.This control strategy does not need any hardware change or modification.Therefore, which save
The cost of dynamic breaker.Further embodiment provides a kind of control system and method, the control system and method enhancing
The effect of rotor-side converter and line side converter and utilize the hot of generator link inductor and inductor rotor device
Energy.This strategy helps to improve the safety of DFIG system.
Term used in this specification " overvoltage " is intended to indicate that more than predetermined voltage level (for example, reference voltage water
It is flat) voltage level.This reference voltage level can be configured according to maximum voltage level, and the maximum voltage level can
To be applied to the electric component and/or accessory of wind-driven generator.Term used in this specification " blade " is intended to indicate that
Any device of reaction force is provided when being moved relative to surrounding fluid.
Term used in this specification " wind-driven generator ", which is intended to indicate that, generates rotational energy using wind energy, specifically,
The kinetic energy of wind is converted to any device of mechanical energy.Term used in this specification " wind-driven generator " is intended to indicate that utilization
Electric energy is generated by the rotational energy that wind energy generates, specifically, the mechanical energy being converted by the kinetic energy of wind is converted to appointing for electric energy
Meaning wind-driven generator.
One exemplary embodiment of DFIG wind power system 200, the DFIG wind power system are couple to utility network 204
On, for carrying out electric power distribution.The DFIG wind power system 200 includes the wind-driven generator 206 being couple on DFIG208.
DFIG208 includes DFIG generator 210, and the DFIG generator includes rotor 212 and stator 214.System 200 includes that can operate
Ground is couple to the gear-box 216 on wind-driven generator 206 and DFIG generator 210.The rotor windings of DFIG208 be couple to back to
On back formula converter 220, and the stator winding of DFIG208 is couple on utility network 204.
Converter 220 is back-to-back formula structure, which includes: rotor-side converter circuit 224；DC intermediate circuit 226,
The circuit provides the Dc bus (DB) with capacitor C；And line side converter circuit 228.Line side converter circuit 228
It is coupled between the stator winding of DFIG208 and DC intermediate circuit 226.
In Fig. 2, utility network 204 makes the winding of generator unit stator 214 (as represented by outer circle) be powered.Typically, institute
State power grid supply three-phase alternating current.Armature spindle is driven in the blade assembly 206 of rotor-side, wind drive, for example, passing through gear-box
216.Generate mechanical force in this way to rotate DFIG rotor 212 (as represented by inner circle).The electrical connection of rotor is across slip ring.
Other than triggering stator winding, the three-phase power from utility network is connected to AC/DC route or grid side turns
On parallel operation 228.The switching mechanisms such as power circuit breaker 230 can be provided in reach the power grid of stator 214 and connector and power grid or
Between line side converter 228.The alternating current that rotor windings generate is supplied in AC/DC rotor-side converter 220.Two function
Rate converter 224 and 228 is connected by DC bus 226.In the illustrated embodiment, each of converter 224 and 228 all may be used
To use insulated door pole bipolar junction transistor, but other conversion equipments also can be used, for example, SCR or MOSFET.
In every embodiment, wind powered generator system 200 may include electrical and control system, described electrical and control
System includes Turbine controller 202, as shown in Figure 4.Turbine controller 202 may include at least one processor and storage
Device, at least one processor input channel, at least one processor output channel, and may include at least one computer.
Term computer used in this specification is not limited to integrated circuit mentioned by computer field, but refers to processor, micro-control
Device, microcomputer, programmable logic controller (PLC) (PLC), specific integrated circuit and other programmable circuits processed, and this specification
Used in these terms be used interchangeably.
In the exemplary embodiment, memory may include, but be not limited to, computer-readable media, for example, arbitrary access
Memory (RAM).Alternatively, one or more storage devices also can be used, for example, floppy disk, compact disk read-only memory
(CD-ROM), magneto-optic disk (MOD) and/or digital versatile disc (DVD).In addition, in the exemplary embodiment, additional is defeated
Entering channel may be, but not limited to, computer peripheral associated with operator interface, for example, mouse and keyboard.This
Outside, in the exemplary embodiment, additional output channel may include, but be not limited to, operator interface monitor.
Processor for Turbine controller handles the information transmitted from multiple Electrical and Electronic devices, and described device can
To include, but are not limited to voltage and current converter.RAM and/or storage device are to the information and instruction that will be executed by processor
It is stored and transmitted.
RAM and/or storage device can be used for storing temporary variable, static state during processor executes instruction (that is, not
Become) information and instruction or other average informations, and above content is supplied to processor.Performed instruction includes, but not
It is limited to, stores Content Transformation and/or comparator algorithm.Ware circuit is not limited to the execution of instruction sequence and software refers to
The random specific combination of order.
In every embodiment, Turbine controller 202 is configured to from one or more voltage and current sensors
Receive multiple voltage and current measuring signals.In addition, Turbine controller is configured to be monitored and controlled and wind-driven generator 200
Associated at least some operation variables.Voltage and current sensor is conductively coupled to the electricity for promoting the operation of electrical and control system
Any part of gas and control system.
The target of controller 202 is: 1) enhancing the effect of rotor-side converter and line side converter and utilize power generation
The hot property of machine circuit inductor and inductor rotor device.(safety that this strategy helps to improve DFIG system), 2)
During DFIG is detached from power grid or loses load, direct-current chain, DFIG grid side and overvoltage and reduction in rotor-side are eliminated
Risk that DFIG overruns and 3) reduce capacity requirement to dynamic breaker.
Controller 202 monitors the signal of many system variables, and to the line transfer of DFIG wind power system shown in Fig. 2
The operation of device 224 and rotor converter 228 is controlled.Fig. 2 shows the exemplary of the basic configuration of DFIG wind power system 200
Embodiment.In this example, switch SW230 in distal side is occurred with capacitive load CL operation due to fault ground and DFIG208
Tripping.
The equivalent circuit diagram of Fig. 2 is shown in Fig. 3.Controller 202 as shown in Figure 4 can monitor such as Fig. 2 into Fig. 3 institute
The variable of expression, wherein
Rs is generator unit stator resistance device,
Rr is generator amature resistance device,
R1 is L1 resistor,
R2 is L2 resistor,
Is is generator unit stator electric current,
Ir is generator rotor current,
Im is exciting current,
Ic is load current,
Ix is line side converter output current,
Lm is generator magnetic flux amount induction coefficient.Ignore the leakage of generator magnetic flux amount,
L1 is included in the inductor in rotor-side converter,
L2 is included in the inductor in the converter of line side,
CL is capacitive load, and
Cx is line side converter equivalent condenser.
Fig. 5 illustrates the polar plot of the DFIG wind generator system 200 in Fig. 2.In Fig. 5, Em is stator-induced electromagnetic pressure,
Wherein
Now according to Fig. 5, generator is run under self-excitation state.Electric current Is has no better than Ic and with exciting current Im
There is the same direction.Due to Ic, Em can be bigger than the Em before fault ground state.It therefore, can be with being subjected to Ic or CL capacitor
The increase of Em and generate overvoltage.
In order to re-establish Em to normal operation level and Em be made to get rid of overvoltage level state, control system must
Im must be reduced to normal level.Control system can reduce the Ir in Fig. 5 or change the direction of Ir as shown in Figure 6.
In the polar plot of DFIG wind power system shown in Fig. 6, Im=Is+Ir.Control system can be by will be shown in Fig. 5
The direction change of Ir calculate suitable Im to direction shown in fig. 6.The direction change of Ir can be such that Em is decreased back to normally
Risk horizontal and that direct-current chain overvoltage can be eliminated.
As shown in fig. 7, control system is to power generation in order to provide engine health and prevent rotor-side from overvoltage occurs
Machine speed is limited to prevent from overrunning or postpone generator to prevent from overrunning.System controls line side converter 228
System is to export the maximum Ix in its capacitor.The direction Ix is identical as the direction Ic.
Meanwhile system must increase Ir to obtain suitable Im, and prevent Em from reaching overvoltage level.As shown in fig. 7,
System can obtain biggish Ix, Is and Ir, (wherein Is=Ix+Ic).
Therefore, system generates biggish power loss, and the power loss is calculated from following equation: P ≈ Ix2*R2
+Is2*Rs+Ir2* (Rr+R1), so that biggish torque is obtained to limit alternator speed, to prevent from overrunning or postponing hair
Motor is to prevent from overrunning.
On the other hand, if DFIG wind power system in long cable connection to power network and due to long cable by keeping Ic non-
Chang great, then Ir itself may be insufficient to compensate for Ic (beyond generator capacity).System can control Ix to assist the benefit to Ic
It repays, as shown in Figure 8.
In the case where being related to has the larger wind power plant of longer transmission distance, the demand for compensating Ic may be will increase, because
A large amount of capacitance current is generated for (1) long AC cable, this can significantly reduce the transmission capacity of cable and need biggish idle
Power compensation；And/or (2) AC is connected between wind power plant and power grid the event for causing simultaneously operating, therefore occurring on power grid
Barrier will have a direct impact on wind power plant, and vice versa.
Fig. 9 is the exemplary control strategy side for preventing wind-driven generator overvoltage and overrunning illustrated according to this teaching
The flow chart of method 900.At box 910, step starts.Then, it is produced electricl energy by DFIG wind turbine power generation machine.In side
At frame 920, executes and check to determine whether DFIG is detached from power grid or loses load.If DFIG is connected to electricity at box 920
On the net, then step enters box 990 and terminates.
If DFIG is detached from power grid or loses load at box 920, step enters box 930 and executes inspection
Look into determine whether voltage level of power grid is excessively high.If voltage level of power grid is not excessively high at box 930；So step enters
To box 990 and terminate.If power grid level is excessively high at box 930, step enters box 940.In box 940
In, Ir or Ix is adjusted to reduce Im in system.In box 950, execute check with determine voltage level of power grid whether mistake
It is high.If voltage level of power grid is excessively high at box 950, step returns to box 940.
If power grid level is not excessively high at box 950, step enters box 960.At box 960, hold
Row checks to determine whether to accelerate generator.If determination does not accelerate generator in box 960, walk
Suddenly it enters box 990 and terminates.If determination accelerates generator at box 960, the step side of entering
Frame 970.At box 970, step increases Ir and Ix and Im is kept constant.In box 980, check whether that output is maximum
Ix.If not exporting maximum Ix at box 980, step returns to box 960.If exported in box 980 maximum
Ix, then step enters box 990 and terminates.
It can be with workflow shown in Fig. 9 to limit in fact, carrying out displacement (feathering blade) to blade
The increased speed of generator processed, until power system restoration or DFIG tripping.If during emergency shutdown or
When wind speed is more than maximum rated speed, carrying out displacement to blade can be such that rotor stops.In the building and maintenance of wind-driven generator
In the process, displacement usually is carried out to reduce unnecessary rotation torque in the case where fitful wind occurs to blade.Blade is away from control
It is the feature of nearly all large-scale modern horizontal axis wind-driven generator.At runtime, with the variation of wind speed, wind-driven generator
Control system is to blade away from being adjusted so that spinner velocity to be maintained in operational limit.
Above-mentioned apparatus and method assist control system to prevent overvoltage and overrun.Specifically, control system uses route
Side converter or rotor-side converter are to obtain suitable Im, to eliminate power network overvoltage.Disappear to obtain biggish power
Consumption, control system also will increase Ix and Ir, while keep Im constant.Generator can be slowed down in this way to accelerate and eliminate direct-current chain mistake
Voltage, and network voltage is controlled to normal level.All these features jointly or can be independently increased DFIG system
Safety.
Those skilled in the art will understand that, can be to of the invention under the premise of not departing from the range of this teaching
Overvoltage protection and method carry out various modifications and change.By way of example, according to the overvoltage protection of this teaching
Device can make together with total power converter wind power system, multiphase wind power system or other similar system including converter
With.
In particular according to foregoing teachings, those skilled in the art can be provided comprising alternative implementation in the present invention
Example, example and modification.Furthermore, it is to be understood that term for describing the present invention is intended to as illustrative word rather than limits
Property word.
Those skilled in the art will also be appreciated that in the case where not departing from the scope and spirit of wood invention, can be with
It is preferably configured with a variety of adjustment and modification of alternate embodiment to above-mentioned.It will be understood, therefore, that in appended claim
In the range of, the other modes in addition to the mode illustrated in this specification can be used to practice the present invention.
Claims (20)
1. a kind of controller for doubly-fed induction generator system, the system comprises:
Double fed induction generators；
Back-to-back formula converter comprising:
Rotor-side converter；
Direct-current chain, the direct-current chain have at least one capacitor and couple with the output of the rotor-side converter；
And
With the line side converter of the output coupling of the direct-current chain；And
Controller, the controller are configured to power to the back-to-back formula converter, the double fed induction generators
The inductor of hot property, the inductor of the rotor-side converter and the line side converter is controlled, to eliminate
The overvoltage in direct-current chain is stated, and reduces and is overrun due to what island effect event generated.
2. controller according to claim 1, wherein the controller converts the back-to-back formula using control algolithm
The inductor and the route of the power of device, the hot property of the double fed induction generators, the rotor-side converter
The inductor of side converter is controlled, and to eliminate the overvoltage in the direct-current chain, and reduces island effect event
Period overruns.
3. controller according to claim 1, wherein the controller is configured to be used together with wind-driven generator.
4. controller according to claim 1, wherein the controller is configured to be used together with hydroelectric generator.
5. controller according to claim 1, wherein the controller is configured to solar power generation application.
6. controller according to claim 1, wherein the controller is configured to the institute to the line side converter
It states inductor to be adjusted, to eliminate the overvoltage.
7. controller according to claim 1, wherein the controller is configured to the institute to the rotor-side converter
It states inductor to be adjusted, to eliminate the overvoltage.
8. controller according to claim 1, wherein the controller is configured to the defeated of the line side converter
Electric current is adjusted and at the same time keep exciting current constant out, is overrun and overvoltage with eliminating double fed induction generators.
9. controller according to claim 1, wherein the controller, which is configured to work as, the long transmission cable of at least one
When being connected on utility network and when needing to compensate the rotor current of the double fed induction generators, by the line
The output current regulation of trackside converter is to max-thresholds.
10. a kind of wind-driven generator for doubly-fed induction generator system, the wind-driven generator include:
For the rotor blade by turned；
Double fed induction generators, the double fed induction generators are rotatably coupled on the rotor blade for generating electricity；
Back-to-back formula converter comprising:
Rotor-side converter；
Direct-current chain, the direct-current chain have at least one capacitor and couple with the output of the rotor-side converter；
And
With the line side converter of the output coupling of the direct-current chain；And
Controller, the controller are configured to power to the back-to-back formula converter, the double fed induction generators
The inductor of hot property, the inductor of the rotor-side converter and the line side converter is controlled, to eliminate
The overvoltage in direct-current chain is stated, and reduces and is overrun due to what island effect event generated.
11. wind-driven generator according to claim 10, wherein the controller is using control algolithm to described back-to-back
The power of formula converter, the hot property of the double fed induction generators, the inductor of the rotor-side converter and institute
The inductor for stating line side converter is controlled, and to eliminate the overvoltage in the direct-current chain, and reduces island effect
Overrunning during event.
12. wind-driven generator according to claim 10, wherein the controller is configured to convert the line side
The inductor of device is adjusted, to eliminate the overvoltage.
13. wind-driven generator according to claim 10, wherein the controller is configured to convert the rotor-side
The inductor of device is adjusted, to eliminate the overvoltage.
14. wind-driven generator according to claim 10, wherein the controller is configured to convert the line side
The output electric current of device is adjusted and at the same time keep exciting current constant, is overrun and excessively electric with eliminating double fed induction generators
Pressure.
15. wind-driven generator according to claim 10, wherein the controller, which is configured to work as, at least one long pass
It, will when transmission cable is connected on utility network and when needing to compensate the rotor current of the double fed induction generators
The output current regulation of the line side converter is to max-thresholds.
16. a kind of wind-driven generator for controlling doubly-fed induction generator system as claimed in claim 10 prevents to generate lonely
Method of the island effect to prevent overvoltage and situation of overrunning, which comprises
It is generated electricity by the rotation of double fed induction generators；
Monitor the connection between the wind-driven generator and the power transmission line of utility network；
Monitor the variation of utility grid voltage；And
In response to the variation of utility grid voltage described during island effect event, running controller prevents overvoltage and shape of overrunning
Condition.
17. further comprising according to the method for claim 16, being adjusted to the inductor of the line side converter
Section, to eliminate the overvoltage.
18. further comprising according to the method for claim 16, being adjusted to the inductor of the rotor-side converter
Section, to eliminate the overvoltage.
19. according to the method for claim 16, further comprising being carried out to the output electric current of the line side converter
It adjusts and at the same time keep exciting current constant, is overrun and overvoltage with eliminating double fed induction generators.
20. further comprising according to the method for claim 16, described when there is the long transmission cable of at least one to be connected to
When on utility network and when needing to compensate the rotor current of the double fed induction generators, the line side is turned
The output current regulation of parallel operation is to max-thresholds.
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| CN106505609A (en) * | 2015-09-08 | 2017-03-15 | 通用电气公司 | Wind turbine and the protection system of wind turbine |
| CN105226713B (en) * | 2015-10-28 | 2018-03-06 | 三一重型能源装备有限公司 | A kind of wind turbine control system and method |
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| CN201846090U (en) * | 2010-07-30 | 2011-05-25 | 艾默生网络能源有限公司 | Double-fed generator system and protection device of double-fed generator system |
| CN103178543A (en) * | 2013-03-18 | 2013-06-26 | 浙江大学 | Double-fed wind generation set high-voltage penetration method capable of realizing inactive support |
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| CN201846090U (en) * | 2010-07-30 | 2011-05-25 | 艾默生网络能源有限公司 | Double-fed generator system and protection device of double-fed generator system |
| CN103178543A (en) * | 2013-03-18 | 2013-06-26 | 浙江大学 | Double-fed wind generation set high-voltage penetration method capable of realizing inactive support |
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