CN106505620A - A kind of transient state reconfiguration system for improving double-fed fan trouble ride-through capability and control method - Google Patents
A kind of transient state reconfiguration system for improving double-fed fan trouble ride-through capability and control method Download PDFInfo
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
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Abstract
The present invention relates to a kind of transient state reconfiguration system for improving double-fed fan trouble ride-through capability and control method.First based on traditional DFIG, accumulation energy type DFIG fault traversings transient state reconstruct topological structure is built, the switching with accumulation energy type DFIG structures under line voltage malfunction under normal operating condition is realized；When then analyzing line voltage rapid drawdown and rising sharply, accumulation energy type DFIG reconstructs stator voltage compensatory michanism and its flow of power under topological structure in transient state；The transient state reconstruct topology merging method of accumulation energy type DFIG is finally obtained, the fault traversing control of DFIG under line voltage failure is realized.The present invention can not only realize the smooth control of Power Output for Wind Power Field under electrical network normal operation, simultaneously can also be under line voltage rapid drawdown or the failure condition for rising sharply, auxiliary realizes the fault traversing control of DFIG, improves using value and economic benefit of the energy storage device in dual feedback wind power generation system.
Description
Technical field
The present invention relates to the operation of power system, analysis and scheduling field, more particularly to a kind of raising double-fed fan trouble
The transient state reconfiguration system of ride-through capability and control method.
Background technology
As the fast development of wind-powered electricity generation in recent years, permeability of the wind-powered electricity generation in electrical network constantly increase, power system is carry
The power-balance of a part, but as Wind turbines do not possess fault ride-through capacity, cause each wind energy turbine set that a lot of large area occur
Off-grid accident, causes larger threat to the stable operation of power system.Wherein, as the double-fed blower fan of one of mainstream model
(DFIG) because its stator side is directly connected with electrical network, especially sensitive to line voltage failure, easily occur by grid voltage sags
Or the off-grid accident for causing that rises sharply, seriously constrain being incorporated into the power networks for DFIG.
In order to ensure under grid fault conditions double-fed fan motor unit can not off-grid continuously run, and meet various countries' electricity
Requirement of the net company to wind-electricity integration, lot of domestic and international scholar have carried out substantial amounts of research to the fault traversing technology of DFIG.Mesh
Before, the solution of fault traversing is broadly divided into two classes：One class is the research base in DFIG operation characteristics and Traditional control strategy
The double-feed current transformer proposed on plinth improves control strategy；The another kind of hardware that is to increase is aided in and corresponding control strategy design.Change
Enter control strategy, such as demagnetization control, introduce PI-R controllers as the supplement etc. of PI controllers, the failure that can improve DFIG is worn
More ability, but still be difficult to meet the networking requirement increasingly strict to Wind turbines of grid-connected directive/guide.Increase hardware householder method, such as
Dynamic electric voltage recovery device (DVR), series coupled compensation device (SCC) etc. are installed additional in stator side, can effective compensation stator terminal voltage
To normal level, the fault ride-through capacity of DFIG is improved, it is apparent that system hardware cost can be significantly increased.
Energy that energy storage device has Dynamic Absorption unnecessary the ability for discharging in good time, can be made up between wind-powered electricity generation well
The shortcomings of having a rest property, fluctuation, at present, there are numerous studies that energy storage device is separately configured in every typhoon power generator excitation DC link
Constitute accumulation energy type DFIG, can preferable Power Output for Wind Power Field fluctuation.Accumulation energy type DFIG structures are based on herein, to DFIG
Fault traversing technology studied, the fault ride-through capacity of DFIG not only can be improved, while accumulation energy type can also be improved
The economic benefit of DFIG.
Content of the invention
The present invention is based on accumulation energy type DFIG, it is proposed that a kind of transient state reconfiguration scheme of raising DFIG fault ride-through capacities and control
Method processed, it is characterised in that comprise the following steps：
A kind of transient state reconfiguration system of raising DFIG fault ride-through capacities, it is characterised in that based on traditional DFIG, adopt
With distribution configuration mode, the DC side that energy storage device is connected in parallel to DFIG double-feed current transformers by two-way DC/DC converters, constitute
Accumulation energy type DFIG；Transient state reconstruct is carried out to GSC, is which increases a serial interface circuit (l2) being connected with electrical network, the series connection newly
Interface circuit is by the series transformer, braking resistor, LC wave filters being serially connected between DFIG generator terminals and grid entry point (PCC) and two
Electronic power switch is constituted, and its median filter is used for the harmonic wave for eliminating the generation of GSC switching tubes, and braking resistor is used for consuming series connection
Overload power on mouth circuit, protects GSC；In order to filter switch harmonic, on parallel interface circuit (l1), LC wave filters are also concatenated
And control the electronic power switch of the branch breaking.
In a kind of transient state reconfiguration system of above-mentioned raising DFIG fault ride-through capacities, under normal operating condition, accumulation energy type
DFIG is operated under stable state topological structure and stable state control strategy；That is interface circuit l1's GSC is connected with electrical network in parallel, series connection
Interface circuit is bypassed, and now, GSC is responsible for maintaining the constant of DC bus-bar voltage, ESD to adjust the exchange between GSC and electrical network
Power, can achieve the smooth control of DFIG power outputs；
Under line voltage malfunction, accumulation energy type DFIG operates in transient state reconstruct topological structure and transient state control strategy
Under；That is GSC is connected with electrical network by serial interface circuit l1, and now, energy storage device (ESD), GSC and serial interface circuit are constituted
Accumulation energy type series connection dynamic electric voltage recovery device (ESD-DVR), under transient state control strategy, ESD-DVR realizes carrying out stator voltage
Compensation, intercepts impact of the abrupt change of power grid voltage to DFIG, while ESD replaces GSC, is responsible for maintaining the constant of DC bus-bar voltage,
So as to improve the low voltage ride-through capability of accumulation energy type DFIG；When line voltage recovers normal, accumulation energy type DFIG is run by transient state
Pattern switching is to steady state mode of operation.
A kind of control method based on the transient state reconfiguration system for improving DFIG fault ride-through capacities, it is characterised in that include：
Step 1, based on traditional DFIG, builds accumulation energy type DFIG fault traversings transient state reconstruct topological structure, just realizes
The often switching under running status with accumulation energy type DFIG structures under line voltage malfunction；
Step 2, when analyzing line voltage rapid drawdown and rising sharply, accumulation energy type DFIG reconstructs the stator electricity under topological structure in transient state
Pressure compensatory michanism and its flow of power；
Step 3, based on the accumulation energy type DFIG fault traversings transient state reconstruct topological structure obtained by step 1, according to step 2 point
The stator voltage compensatory michanism that analysis is obtained, obtains the transient state reconstruct topology merging method of accumulation energy type DFIG, realizes electrical network electricity
The fault traversing control of DFIG under pressure failure.
In a kind of above-mentioned control method based on the transient state reconfiguration system for improving DFIG fault ride-through capacities, described step
In rapid 2, under line voltage failure, the concrete analysis of the stator voltage compensatory michanism and its flow of power of accumulation energy type DFIG is as follows：
When detecting line voltage positive-sequence component less than 0.9p.u or being higher than 1.1p.u, accumulation energy type DFIG will be by electric power
The control realization fault traversing transient state reconstruct of electronic switch, i.e., switch to transient state reconstruct topological structure by stable state topological structure；This
When, ESD-DVR will be by compensation of the serial interface circuit realiration to stator voltage, electrical network electricity by its lifting and before maintaining to failure
Pressure, so that intercept line voltage rapid drawdown or the impact to DFIG that rises sharply；Accordingly, the offset voltage for providing needed for ESD-DVR
For
Ucom=Ug_pre-Ug=Δ Ug1+ΔUg2Formula one
In formula, Ug_preFor line voltage before failure, with synchronous speed ωsRotation, falls during electric network fault as Ug, it is known that, UgBag
Contain with synchronous speed ωsThe positive sequence voltage component of rotation and with-ωsThe negative sequence voltage components (under unbalanced fault) of rotation, i.e. Ug=
Ug1+Ug2, Δ Ug1=Ug_pre-Ug1Fall for positive sequence voltage, Δ Ug2=-Ug2；Therefore, Δ Ug1、ΔUg2Needed for as ESD-DVR
The offset voltage positive-sequence component of offer and negative sequence component；
In due to failure process, ESD-DVR carries out real-Time Compensation to DFIG stator voltages, and DFIG stator voltages are maintained not
Become, DFIG can carry out active, reactive power according to conventional control strategy and adjust；
Set DFIG and operate in unity power factor state (i.e. Φ1=0), if stator positive sequence voltage falls depth during failure
For d, ignore the loss of series transformer, then, during failure, ESD-DVR outputs or the active power for absorbing can be expressed as：
From formula, ESD-DVR absorbs or the active power of output is mainly fallen before depth and failure by positive sequence voltage
DFIG stators power output determines；
When DFIG operates in supersynchronous running status, rotor-side power flows to DC bus capacitor by generator；Work as electrical network
When voltage falls, from formula, ESD-DVR from electrical network absorbed power and will flow to DC bus capacitor；Now, and it is connected in
The ESD of DFIG DC bus capacitors, will absorb rotor power and DVR power to maintain the constant of DC capacitor voltage, it is to avoid
Two side inflow power cause DC capacitor voltage pump liter, will threaten the safe operation of electric capacity；As GSC rated power is usually
The 30-35% of Wind turbines rated power, in the case of serious grid voltage sags, the power that ESD-DVR absorbs will be greater than GSC's
Rated power, now, braking resistor automatically engages the power for consuming that part DVR absorbs by being triggered, it is ensured that the operation peace of GSC
Entirely；
When DFIG operates in subsynchronous running status, rotor-side power flows to generator by DC bus capacitor；Work as electrical network
When voltage generation transient state rises sharply, understand that ESD-DVR will be to electrical network power output from formula；Now, ESD will discharge power satisfaction and turn
Sub- side and the power demand of ESD-DVR, maintain power balance of DC side, so as to maintaining DC voltage constant, it is to avoid both sides
Flowing out power causes DC voltage to drastically reduce, and causes RSC or GSC ovennodulations, it is impossible to realize the high voltage fail of DFIG
Pass through.
In a kind of above-mentioned control method based on the transient state reconfiguration system for improving DFIG fault ride-through capacities, the step
Concrete control method in 3 is：
Step 3.1, in order to accurately identify electric network fault and be easy to the compensation of stator voltage, electrical network is short-circuited failure
When, must accurately extract line voltage positive-sequence component Ug1With negative sequence component Ug2(under unbalanced fault)；If three-phase is quiet under failure condition
Only under ABC coordinate systems, electrical network real-time voltage is Uga、Ugb、Ugc, can convert it to, under the static α β coordinate systems of two-phase, obtain α by formula
Line voltage such as formula under β coordinate systems：
Wherein,Respectively t=0 moment, line voltage positive-sequence component Ug1With negative sequence component Ug2With α axles (A axles) it
Between initial angle；
According to formula, after the time delay of T/4, line voltage will be changed into
Convolution four and formula five, can obtain the positive and negative order components of line voltage and can be expressed as follows respectively under α β coordinate systems：
In order to more simply represent above-mentioned relation, can be indicated to formula and using matrix form：
Can extract by phaselocked loop (PLL) and obtain the angle between t=0 moment d axles and α axles is θ, then α β coordinate systems in formula
Under line voltage positive and negative sequence component can be respectively converted under positive sequence and negative synchronous rotating frame, be shown below：
The instantaneous value U of the positive and negative order components that obtain stator voltage can extract in the same manners1dqAnd Us2dq；
Step 3.2, extracts the positive and negative order components of the line voltage for obtaining according to step 3.1, and design system operational mode switches
Control method；Line voltage positive-sequence component size can be obtained by formula nine, i.e.,
When line voltage positive-sequence component Ug1When dropping into below 0.9p.u. or being soared to more than 1.1p.u., accumulation energy type
DFIG carries out fault traversing transient state reconstruct, and GSC controllers are switched to transient voltage compensation model, after failure removal, work as voltage
When returning to interval (0.9p.u., 1.1p.u.), accumulation energy type DFIG returns to steady state mode of operation, therefore can set up respective logic
Judge module, realizes the switching control between GSC parallel connection steady state mode of operation and transient state series voltage compensation model, i.e.,
Step 3.3, under transient state reconstruct topological structure, is designed to the fault traversing control method of accumulation energy type DFIG,
It is passed to serial interface circuit l2 and stator voltage compensation is provided to accumulation energy type DFIG, realizes fault traversing control.
In a kind of above-mentioned control method based on the transient state reconfiguration system for improving DFIG fault ride-through capacities, the step
3.3 concrete control method is：Step 3.3.1, the offset voltage provided needed for formula one, ESD-DVR include positive sequence point
Amount and negative sequence component；Under positive sequence synchronous rotary dq coordinate systems, the positive and negative order components of offset voltage are respectively DC quantity and frequency
For the of ac of 100Hz, and under negative phase-sequence rotation dq coordinate systems, the positive-sequence component of offset voltage is of ac, and negative sequence component is
DC quantity；As PI controllers can only be adjusted to DC quantity, under positive sequence synchronous rotary dq coordinate systems, PI controllers cannot
Control to offset voltage positive-sequence component and negative sequence component is realized simultaneously；Therefore, under positive and negative sequence synchronous rotating frame respectively
Realized to offset voltage positive-sequence component and the independent control of negative sequence component using PI controllers, and positive-negative sequence is exported to ESD-DVR
Voltage adopts direct voltage control strategy；
According to the positive-negative sequence voltage subtraction method of step 3.1, the extractable instantaneous value for obtaining the positive and negative order components of stator voltage
Respectively Us1dqAnd Us2dq, then, under double sequence dq coordinate systems, the command value of the positive and negative order components of offset voltage and instantaneous value are respectively
At (dq)+Coordinate system and (dq)-Under coordinate, the positive and negative component (U of ESD-DVR output voltagescom1dq) and negative sequence component
(Ucom2dq) respectively with corresponding positive sequence voltage reference value (U* com1dq) and negative sequence voltage reference value (U* com2dq) be compared, control through PI
Device processed respectively obtains the positive-negative sequence modulation voltage (U of ESD-DVR after adjustingf1dq, Uf2dq), then it is quiet to project to three-phase through coordinate transform
Only under the system of axis, its control signal of resultant voltage space vector after amplitude limit as GSC transmission voltages produces current transformer
Trigger pulse；
Step 3.3.2, using the energy storage device based on double layer capacitor (EDLC), which passes through two-way DC/DC and becomes this patent
Parallel operation is in parallel with the DC capacitor of DFIG；During failure, ESD is mainly constant as target with maintenance DC bus-bar voltage, by right
DC/DC convertor controls EDLC absorb or active power of output maintains power balance of DC side, and then adjust DC capacitor voltage
Constant；
When the power increase that RSC and GSC flow to DC side causes DC bus-bar voltage to rise, DC/DC converters work
In decompression mode, by DC side power storage in EDLC；When the power increase of direct current lateral RSC and GSC output causes direct current
When busbar voltage declines, DC/DC converters work in boost mode, and EDLC releases energy, with compensating direct current busbar voltage；
DC/DC convertor controls strategy is specifically：DC/DC adopts Double closed-loop of voltage and current structure, and outer shroud is direct current
Busbar voltage controller, by DC bus-bar voltage measured value UdcWith DC bus-bar voltage reference value UdcrefIt is compared, both are inclined
Difference produces EDLC current reference values by PI voltage regulators；Inner ring EDLC current controller will be carried out with EDLC current measurement values
Relatively, both deviations, through PI current regulators, are that the IGBT switches of DC/DC converters produce gate-control signal, switching device g1
Complementary with the gate-control signal of g2；By the energy storage of the conducting control realization EDLC of g1 and g2 and release energy, i.e., when g1 is turned on, g2
During closing, DC/DC converters work in booste operation state；When g1 is closed, and g2 is turned on, DC/DC converters work in step-down
Running status；DC/DC converters are to control the energy of EDLC storages and release by adjusting the dutycycle of two switch conductions
Amount, so that maintain the constant of DC bus-bar voltage.
The present invention compared with prior art, with advantages below：1st, given full play to energy storage device quickly can absorb and
The technical advantage of delivered power so as to the smooth control of Power Output for Wind Power Field can not only be realized under electrical network normal operation
System, while can also aid in the fault traversing control for realizing DFIG, improve under line voltage rapid drawdown or the failure condition for rising sharply
Using value and economic benefit of the energy storage device in dual feedback wind power generation system.2nd, in the transient state topological structure and its control
Under method, low-voltage and the high voltage crossing control of DFIG can be automatically obtained, and obtains better effects.
Description of the drawings
Fault traversing transient state reconstruct topological structures of the Fig. 1 for accumulation energy type DFIG.
Fig. 2 is ESD-DVR topology diagrams.
Fig. 3 a are offset voltage vectogram under line voltage rapid drawdown.
Fig. 3 b rise sharply lower offset voltage vectogram for line voltage.
Fig. 4 a are accumulation energy type DFIG fault traversings transient state topological structure power flow chart (supersynchronous running status).
Fig. 4 b are accumulation energy type DFIG fault traversings transient state topological structure power flow chart (subsynchronous running status).
Fig. 5 is system running pattern switching control strategy.
Fig. 6 is the positive and negative sequence voltage Compensation Strategies of ESD-DVR.
Topology diagram and DC/DC convertor controls strategy of the Fig. 7 for ESD.
Fig. 8 a are the voltage waveform (stator voltage during failure under traditional approach) under transient state reconfigurable control scheme.
Fig. 8 b are the voltage waveform (ESD-DVR offset voltages) under transient state reconfigurable control scheme.
Fig. 8 c are the voltage waveform (stator voltage) under transient state reconfigurable control scheme.
Fig. 9 a are transient characterisitics contrast (rotor current) under transient state reconfigurable control scheme and traditional approach.
Fig. 9 b are the transient characterisitics contrast (DC bus-bar voltage under transient state reconfigurable control scheme and traditional approach
(kV)).
Fig. 9 c are transient characterisitics contrast (stator active power) under transient state reconfigurable control scheme and traditional approach.
Fig. 9 d are transient characterisitics contrast (rotor speed) under transient state reconfigurable control scheme and traditional approach.
Figure 10 a are the system load flow (active power of injection electrical network) under transient state reconfiguration scheme during failure.
Figure 10 b are the system load flow (active power that DVR absorbs) under transient state reconfiguration scheme during failure.
Figure 10 c are the system load flow (flowing into the active power of GSC) under transient state reconfiguration scheme during failure.
Figure 10 d are the system load flow (rotor active power) under transient state reconfiguration scheme during failure.
Figure 10 e are the system load flow (active power that ESD absorbs) under transient state reconfiguration scheme during failure.
Voltage waveform (line voltage) when Figure 11 a rise sharply for three-phase voltage.
Voltage waveform (DVR offset voltages) when Figure 11 b rise sharply for three-phase voltage.
Figure 11 c are voltage-contrast.
Voltage waveform (stator voltage) when Figure 11 d rise sharply for three-phase voltage.
Simulation result contrast (the note of transient state reconfigurable control scheme and traditional approach when Figure 12 a rise sharply for three-phase voltage
Enter the active power of electrical network).
When Figure 12 b rise sharply for three-phase voltage, the simulation result contrast of transient state reconfigurable control scheme and traditional approach is (straight
Stream busbar voltage).
When Figure 12 c rise sharply for three-phase voltage, the simulation result contrast of transient state reconfigurable control scheme and traditional approach (turns
Electron current).
When Figure 12 d rise sharply for three-phase voltage, the simulation result contrast of transient state reconfigurable control scheme and traditional approach (turns
Rotor speed).
DFIG-ESD power flows when Figure 13 rises sharply for three-phase voltage.
Specific embodiment
Below by embodiment, and accompanying drawing is combined, technical scheme is described in further detail.
Embodiment：
This patent demonstrates the control method respectively under following two failure conditions and is improving DFIG fault ride-through capacities
The validity of aspect：1) two phase ground, Voltage Drop failure；2) three-phase voltage rises sharply failure.This patent have chosen traditional not
The DFIG control methods of additional aspects scheme as a comparison, to verify put forward tactful superiority herein.Concrete condition is as follows：
1) simulation example of low voltage crossing control
Before failure, system operation is in supersynchronous running status, revolutional slip s=-0.2.There is AB two in t=5s and connect in electrical network
Earth fault, PCC point failure phase voltages fall 85%, and trouble duration is 300ms.Due to trouble duration very short, wind
Speed is varied less, it is therefore assumed that wind speed is constant.
Accompanying drawing 8 (a) is grid voltage waveform during failure, and when electric network fault generation is detected, DFIG is from steady-state operation
To transient state operational mode, ESD-DVR output voltage compensation line voltages fall (see accompanying drawing 8 (b)) to pattern switching, therefore DFIG
Stator voltage maintains level before failure, such as shown in accompanying drawing 8 (c).
Under traditional approach, line voltage start to fall with recovery process, the acute variation of stator voltage, it will
Induce higher rotor transient current.As shown in accompanying drawing 9 (a), when failure occurs, rotor current is increased to 4p.u., exceedes
The upper current limit of RSC, will cause major injury to current transformer.Meanwhile, the rotor current fluctuation for inducing is larger, does not utilize DFIG
Normal operation.In addition, as shown in accompanying drawing 9 (b), rotor transient current is flowed into through RSC after DC side, and the voltage of DC side is lifted
Rise to 1.4p.u.And when adopting proposed transient state reconfiguration scheme, the transient state rotor current in rotor loop is had
The control of effect, rotor current are only up to 1.7p.u. (see accompanying drawing 9 (a)), and current oscillation is less, and the electric current in RSC holds completely
In the range of receiving.Correspondingly, also not less than its upper voltage limit, such as accompanying drawing 9 (b) is shown for DC voltage.
Accompanying drawing 9 (c) gives the active output waveforms of DFIG under two kinds of control programs.From accompanying drawing 9 (c), tradition control
Under scheme processed, the active output of stator drops to 0.52p.u., cause between machine torque and electromagnetic torque serious uneven with
And the rising of generating unit speed.And after adopting DVR compensation, DFIG is not affected by electric network fault during failure substantially, active defeated
Recover by after going out to occur brief fluctuations, considerably increase the flexibility of DFIG Power Controls during failure.Correspondingly, such as attached
Shown in Fig. 9 (d), as the fast quick-recovery of active output, the uneven torque of unit disappear, the rotating speed of DFIG units will not also be sent out
Changing.
Accompanying drawing 10 gives the effective power flow change compensated after control during failure using ESD-DVR.By accompanying drawing 10 (a),
B () understands, during failure, the active power of DFIG injection electrical networks is reduced, and remaining wind power is transported to net side unsteady flow through DVR
Device.By accompanying drawing 10 (c) it is found that the power that DVR absorbs has exceeded the rated capacity of GSC, but depositing due to braking resistor
, absorbing after Partial Power through braking resistor, the power for flowing through GSC will drop to 0.35p.u..
2) simulation example of high voltage crossing control
May cause line voltage to rise when cutting off big load and being incorporated to jumbo electric capacity, and this patent is proposed
Control method can also solve the elevated problem of line voltage.During emulation, when arranging t=5s, line voltage rises to
1.25p.u., and continue 300ms, in failure process, wind speed is 9.2m/s and keeps constant.
Under normal circumstances, GSC coordinates the active output of control DFIG as net side current transformer with energy storage device.Work as detection
When rising to 1.1p.u. to line voltage, accumulation energy type DFIG systems will switch to transient state operational mode, and ESD-DVR will be to DFIG
Stator voltage is compensated, and the voltage of now ESD-DVR compensation is negative value, and ESD-DVR is to electrical network power output.By ESD-
The compensation of DVR, DFIG stator voltages can be remained unchanged substantially.Accompanying drawing 11 gives line voltage, ESD-DVR offset voltages and
The virtual value of stator voltage.
From accompanying drawing 12 (d), under traditional approach, when failure occurs, line voltage rises, and DFIG stator sides will
Active impact can be subject to, now DFIG rotating speeds drop to 0.91p.u. from 0.94p.u., to compensate unbalanced power.And using this
After the accumulation energy type DFIG compensation controls carried by patent, due to the voltage compensation of ESD-DVR, stator side power can be quickly recovered to
Normal range of operation, without causing unbalanced power, therefore after failure vanishes, DFIG also will not be affected by failure, and energy
Continue normally to be incorporated into the power networks.After using stator voltage compensation, the rotating speed of DFIG has also obtained effective control, can be in failure mistake
Maintain in normal range (NR) in journey.
In traditional approach, general using PI controls, in order to compensate stator voltage, GSC can increase its index of modulation, control
The active power of net side redundancy processed flows to DC side, to keep DC voltage constant.But using this compensation way, will lead
Cause the diode forward conducting of the reverse parallel connection of composition GSC so that Partial Power is back to GSC, i.e. DC side and will inhale from electrical network
Receive energy.As shown in accompanying drawing 12 (b), during using traditional control program, DC voltage is most caused to rise at last
In 1.36p.u., and failure process, DC side overvoltage will be present always, be protection DC bus capacitor, finally be likely to result in
DFIG off-grids run.But, after being controlled using accumulation energy type DVR, GSC will inject backward voltage to electrical network, to keep stator voltage
Constant so that in failure process, DC voltage is maintained in safe range, can finally avoid the DC side mistake in Traditional control
Voltage.In addition, as shown in accompanying drawing 12 (c), compared with traditional approach, after being controlled using accumulation energy type DVR, rotor transient current
Degree of oscillation also obtained effective suppression, and plateau can be returned to quickly.Therefore, proposed failure is worn
More control strategy can also effectively improve DFIG high voltage crossing abilities.
Accompanying drawing 13 gives the active output waveform under voltage rise fault.Before failure occurs, DFIG operates in supersynchronous
State, rotor excitation current flow to rotor loop from DC side.Failure occur when, as shown in Figure 13, GSC as DVR actions,
Backward voltage is injected to electrical network, to maintain stator voltage constant.While GSC is to power network compensation line voltage, energy-storage system
0.13p.u. active power is provided to rotor loop and GSC, wherein GSC injects the active power of about 0.1p.u. to electrical network.Cause
For the injecting power for having GSC, the final active output of DFIG-ESD systems is improved to 0.5p.u. from 0.4p.u..Failure process
In, rotor power is provided by energy-storage system.
The present invention be can be seen that according to above-mentioned simulation example result can be real in the case of line voltage rapid drawdown or rising sharply
The system model switching and its low voltage crossing control of existing accumulation energy type DFIG and high voltage crossing are controlled, and make the rotor of DFIG and straight
The transient characterisitics of stream side are able to maintain that in normal range (NR).Meanwhile, energy storage device has been obtained sufficiently in the transient state control of DFIG
Utilize, improve the economic benefit of energy storage device, have important practical significance and good application prospect.
Specific embodiment described herein is only to the spiritual explanation for example of the present invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (6)
1. a kind of transient state reconfiguration system of raising DFIG fault ride-through capacities, it is characterised in that based on traditional DFIG, adopts
Distribution configuration mode, the DC side that energy storage device is connected in parallel to DFIG double-feed current transformers by two-way DC/DC converters constitute storage
Can type DFIG；Transient state reconstruct is carried out to GSC, is which increases a serial interface circuit (l2) being connected with electrical network, the series connection newly
Mouth circuit is by the series transformer, braking resistor, LC wave filters and two electricity being serially connected between DFIG generator terminals and grid entry point (PCC)
Power electronic switch is constituted, and its median filter is used for the harmonic wave for eliminating the generation of GSC switching tubes, and braking resistor is used for consuming serial interface
Overload power on circuit, protects GSC；In order to filter switch harmonic, also concatenate on parallel interface circuit (l1) LC wave filters with
And control the electronic power switch of the branch breaking.
2. the transient state reconfiguration system of a kind of raising DFIG fault ride-through capacities according to claim 1, it is characterised in that just
Often under running status, accumulation energy type DFIG is operated under stable state topological structure and stable state control strategy；That is interface is electric in parallel for GSC
Road l1 is connected with electrical network, and serial interface circuit is bypassed, and now, GSC is responsible for maintaining the constant of DC bus-bar voltage, ESD to adjust
Exchange power between GSC and electrical network, can achieve the smooth control of DFIG power outputs；
Under line voltage malfunction, accumulation energy type DFIG is operated under transient state reconstruct topological structure and transient state control strategy；I.e.
GSC is connected with electrical network by serial interface circuit l1, and now, energy storage device (ESD), GSC and serial interface circuit constitute energy storage
Type series connection dynamic electric voltage recovery device (ESD-DVR), under transient state control strategy, ESD-DVR realizes compensating stator voltage,
Impact of the abrupt change of power grid voltage to DFIG is intercepted, while ESD replaces GSC, is responsible for maintaining the constant of DC bus-bar voltage, so as to carry
The low voltage ride-through capability of high accumulation energy type DFIG；When line voltage recovers normal, accumulation energy type DFIG is cut by transient state operational mode
Shift to steady state mode of operation.
3. a kind of based on improve DFIG fault ride-through capacities transient state reconfiguration system control method, it is characterised in that include：
Step 1, based on traditional DFIG, builds accumulation energy type DFIG fault traversings transient state reconstruct topological structure, realizes normal fortune
Switching under row state with accumulation energy type DFIG structures under line voltage malfunction；
Step 2, when analyzing line voltage rapid drawdown and rising sharply, accumulation energy type DFIG is mended in the stator voltage that transient state is reconstructed under topological structure
Repay mechanism and its flow of power；
Step 3, based on the accumulation energy type DFIG fault traversings transient state reconstruct topological structure obtained by step 1, analyzes according to step 2
The stator voltage compensatory michanism for arriving, obtains the transient state reconstruct topology merging method of accumulation energy type DFIG, realizes line voltage event
The fault traversing control of the lower DFIG of barrier.
4. according to claim 1 a kind of based on improve DFIG fault ride-through capacities transient state reconfiguration system controlling party
Method, it is characterised in that in described step 2, under line voltage failure, the stator voltage compensatory michanism of accumulation energy type DFIG and its work(
The concrete analysis of rate flowing is as follows：
When detecting line voltage positive-sequence component less than 0.9p.u or being higher than 1.1p.u, accumulation energy type DFIG will be by power electronics
The control realization fault traversing transient state reconstruct of switch, i.e., switch to transient state reconstruct topological structure by stable state topological structure；Now,
ESD-DVR will be by compensation of the serial interface circuit realiration to stator voltage, line voltage by its lifting and before maintaining to failure,
So as to line voltage rapid drawdown can be intercepted or the impact to DFIG that rises sharply；Accordingly, needed for ESD-DVR, the offset voltage of offer is
Ucom=Ug_pre-Ug=Δ Ug1+ΔUg2Formula one
In formula, Ug_preFor line voltage before failure, with synchronous speed ωsRotation, falls during electric network fault as Ug, it is known that, UgComprising with
Synchronous speed ωsThe positive sequence voltage component of rotation and with-ωsThe negative sequence voltage components (under unbalanced fault) of rotation, i.e. Ug=Ug1+
Ug2, Δ Ug1=Ug_pre-Ug1Fall for positive sequence voltage, Δ Ug2=-Ug2；Therefore, Δ Ug1、ΔUg2There is provided needed for as ESD-DVR
Offset voltage positive-sequence component and negative sequence component；
In due to failure process, ESD-DVR carries out real-Time Compensation to DFIG stator voltages, and DFIG stator voltages remain unchanged,
DFIG can carry out active, reactive power according to conventional control strategy and adjust；
Set DFIG and operate in unity power factor state (i.e. Φ1=0), if stator positive sequence voltage falls depth for d during failure,
Ignore the loss of series transformer, then, during failure, ESD-DVR outputs or the active power for absorbing can be expressed as：
From formula, ESD-DVR absorbs or the active power of output mainly falls DFIG before depth and failure by positive sequence voltage
Stator power output determines；
When DFIG operates in supersynchronous running status, rotor-side power flows to DC bus capacitor by generator；Work as line voltage
When falling, from formula, ESD-DVR from electrical network absorbed power and will flow to DC bus capacitor；Now, and DFIG is connected in
The ESD of DC bus capacitor, will absorb rotor power and DVR power to maintain the constant of DC capacitor voltage, it is to avoid both sides
Flow into power and cause DC capacitor voltage pump liter, the safe operation of electric capacity will be threatened；As GSC rated power is usually wind-powered electricity generation
The 30-35% of unit rated power, in the case of serious grid voltage sags, the power that ESD-DVR absorbs will be greater than the specified of GSC
Power, now, braking resistor automatically engages the power for consuming that part DVR absorbs by being triggered, it is ensured that the operation safety of GSC；
When DFIG operates in subsynchronous running status, rotor-side power flows to generator by DC bus capacitor；Work as line voltage
When generation transient state rises sharply, understand that ESD-DVR will be to electrical network power output from formula；Now, ESD will discharge power and meet rotor-side
With the power demand of ESD-DVR, power balance of DC side is maintained, so as to maintaining DC voltage constant, it is to avoid both sides outflows
Power causes DC voltage to drastically reduce, and causes RSC or GSC ovennodulations, it is impossible to realize that the high voltage fail of DFIG is passed through.
5. according to claim 1 a kind of based on improve DFIG fault ride-through capacities transient state reconfiguration system controlling party
Method, it is characterised in that the concrete control method in the step 3 is：
Step 3.1, in order to accurately identify electric network fault and be easy to the compensation of stator voltage, electrical network be short-circuited failure when, palpus
Line voltage positive-sequence component U is accurately extractedg1With negative sequence component Ug2(under unbalanced fault)；If three phase static ABC under failure condition
Under coordinate system, electrical network real-time voltage is Uga、Ugb、Ugc, can convert it to, under the static α β coordinate systems of two-phase, obtain α β coordinates by formula
The lower line voltage such as formula of system：
Wherein,Respectively t=0 moment, line voltage positive-sequence component Ug1With negative sequence component Ug2Between α axles (A axles)
Initial angle；
According to formula, after the time delay of T/4, line voltage will be changed into
Convolution four and formula five, can obtain the positive and negative order components of line voltage and can be expressed as follows respectively under α β coordinate systems：
In order to more simply represent above-mentioned relation, can be indicated to formula and using matrix form：
Can extract by phaselocked loop (PLL) and obtain the angle between t=0 moment d axles and α axles is θ, then in formula under α β coordinate systems
Line voltage positive and negative sequence component can be respectively converted under positive sequence and negative synchronous rotating frame, be shown below：
The instantaneous value U of the positive and negative order components that obtain stator voltage can extract in the same manners1dqAnd Us2dq；
Step 3.2, extracts the positive and negative order components of the line voltage for obtaining, the control of design system operational mode switching according to step 3.1
Method processed；Line voltage positive-sequence component size can be obtained by formula nine, i.e.,
When line voltage positive-sequence component Ug1When dropping into below 0.9p.u. or being soared to more than 1.1p.u., accumulation energy type DFIG enters
Row fault traversing transient state is reconstructed, and GSC controllers are switched to transient voltage compensation model, after failure removal, when voltage is returned to
When interval (0.9p.u., 1.1p.u.), accumulation energy type DFIG returns to steady state mode of operation, therefore can set up respective logic and judge mould
Block, realizes the switching control between GSC parallel connection steady state mode of operation and transient state series voltage compensation model, i.e.,
Step 3.3, under transient state reconstruct topological structure, is designed to the fault traversing control method of accumulation energy type DFIG so as to
Stator voltage compensation is provided to accumulation energy type DFIG by serial interface circuit l2, realizes fault traversing control.
6. according to claim 1 a kind of based on improve DFIG fault ride-through capacities transient state reconfiguration system controlling party
Method, it is characterised in that the concrete control method of the step 3.3 is：Step 3.3.1, from formula one, carries needed for ESD-DVR
For offset voltage comprising positive-sequence component and negative sequence component；Under positive sequence synchronous rotary dq coordinate systems, the positive-negative sequence of offset voltage
Component is respectively the of ac of DC quantity and frequency for 100Hz, and under negative phase-sequence rotation dq coordinate systems, the positive sequence point of offset voltage
Measure as of ac, negative sequence component is DC quantity；As PI controllers can only be adjusted to DC quantity, in positive sequence synchronous rotary dq
Under coordinate system, PI controllers cannot realize the control to offset voltage positive-sequence component and negative sequence component simultaneously；Therefore, positive and negative
PI controllers are respectively adopted to realize to offset voltage positive-sequence component and the independent control of negative sequence component under sequence synchronous rotating frame,
And positive and negative sequence voltage is exported to ESD-DVR using direct voltage control strategy；
According to the positive-negative sequence voltage subtraction method of step 3.1, the extractable instantaneous value difference for obtaining the positive and negative order components of stator voltage
For Us1dqAnd Us2dq, then, under double sequence dq coordinate systems, the command value of the positive and negative order components of offset voltage and instantaneous value are respectively
At (dq)+Coordinate system and (dq)-Under coordinate, the positive and negative component (U of ESD-DVR output voltagescom1dq) and negative sequence component
(Ucom2dq) respectively with corresponding positive sequence voltage reference value (U* com1dq) and negative sequence voltage reference value (U* com2dq) be compared, control through PI
Device processed respectively obtains the positive-negative sequence modulation voltage (U of ESD-DVR after adjustingf1dq, Uf2dq), then it is quiet to project to three-phase through coordinate transform
Only under the system of axis, its control signal of resultant voltage space vector after amplitude limit as GSC transmission voltages produces current transformer
Trigger pulse；
Step 3.3.2, using the energy storage device based on double layer capacitor (EDLC), which passes through two-way DC/DC converters to this patent
In parallel with the DC capacitor of DFIG；During failure, ESD is mainly constant as target with maintenance DC bus-bar voltage, by DC/DC
Convertor controls EDLC absorb or active power of output maintains power balance of DC side, and then it is constant to adjust DC capacitor voltage；
When the power increase that RSC and GSC flow to DC side causes DC bus-bar voltage to rise, DC/DC converters work in drop
Die pressing type, by DC side power storage in EDLC；When the power increase of direct current lateral RSC and GSC output causes dc bus
When voltage declines, DC/DC converters work in boost mode, and EDLC releases energy, with compensating direct current busbar voltage；
DC/DC convertor controls strategy is specifically：DC/DC adopts Double closed-loop of voltage and current structure, and outer shroud is dc bus
Voltage controller, by DC bus-bar voltage measured value UdcWith DC bus-bar voltage reference value UdcrefIt is compared, both deviations are led to
Cross PI voltage regulators and produce EDLC current reference values；Inner ring EDLC current controller will be compared with EDLC current measurement values
Compared with, both deviations through PI current regulators, be that the IGBT switches of DC/DC converters produce gate-control signal, switching device g1 and
The gate-control signal of g2 is complementary；By the energy storage of the conducting control realization EDLC of g1 and g2 and release energy, i.e., when g1 is turned on, g2 is closed
When closing, DC/DC converters work in booste operation state；When g1 is closed, and g2 is turned on, DC/DC converters work in step-down fortune
Row state；DC/DC converters are to control the energy of EDLC storages and release by adjusting the dutycycle of two switch conductions,
So as to maintain the constant of DC bus-bar voltage.
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| CN109256798A (en) * | 2018-07-23 | 2019-01-22 | 华中科技大学 | DFIG system passes through operation method under a kind of voltage symmetry failure |
| CN109449995A (en) * | 2018-12-29 | 2019-03-08 | 北京天诚同创电气有限公司 | Control the method and system of the brake circuit of wind electric converter |
| EP3484007A1 (en) * | 2017-11-09 | 2019-05-15 | General Electric Company | Dfig converter overmodulation |
| CN110165705A (en) * | 2019-05-30 | 2019-08-23 | 湖南大学 | Marine double-fed fan motor unit high voltage crossing control method and system |
| CN110768296A (en) * | 2019-11-18 | 2020-02-07 | 哈尔滨理工大学 | System for improving low voltage ride through capability of double-fed pumped storage unit and control method thereof |
| CN110797910A (en) * | 2019-10-28 | 2020-02-14 | 天津大学 | Control method for improving low voltage ride through capability of matrix converter system |
| EP3618264A1 (en) * | 2018-08-27 | 2020-03-04 | General Electric Company | Dynamic brake circuit assembly for a wind turbine |
| CN110957761A (en) * | 2019-12-09 | 2020-04-03 | 太原理工大学 | Brushless doubly-fed wind generator symmetrical high-voltage sudden-rise fault ride-through method based on improved flux linkage tracking control method |
| CN115800372A (en) * | 2022-12-07 | 2023-03-14 | 山东电力工程咨询院有限公司 | Direct-current bus superposition type double-fed forced excitation converter based on TAB and method |
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| CN107658905A (en) * | 2017-10-31 | 2018-02-02 | 长沙理工大学 | A kind of fault ride-through of power grid system and method based on double-fed fan motor field |
| CN107658905B (en) * | 2017-10-31 | 2023-08-15 | 长沙理工大学 | Power grid fault ride-through system and method based on doubly-fed wind power plant |
| EP3484007A1 (en) * | 2017-11-09 | 2019-05-15 | General Electric Company | Dfig converter overmodulation |
| CN109256798A (en) * | 2018-07-23 | 2019-01-22 | 华中科技大学 | DFIG system passes through operation method under a kind of voltage symmetry failure |
| CN109256798B (en) * | 2018-07-23 | 2021-06-11 | 华中科技大学 | Ride-through operation method of DFIG system under voltage symmetry fault |
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| EP3618264A1 (en) * | 2018-08-27 | 2020-03-04 | General Electric Company | Dynamic brake circuit assembly for a wind turbine |
| CN109449995A (en) * | 2018-12-29 | 2019-03-08 | 北京天诚同创电气有限公司 | Control the method and system of the brake circuit of wind electric converter |
| CN109449995B (en) * | 2018-12-29 | 2023-07-21 | 北京天诚同创电气有限公司 | Method and system for controlling braking loop of wind power converter |
| CN110165705A (en) * | 2019-05-30 | 2019-08-23 | 湖南大学 | Marine double-fed fan motor unit high voltage crossing control method and system |
| CN110165705B (en) * | 2019-05-30 | 2020-10-27 | 湖南大学 | High-voltage ride through control method and system for offshore double-fed wind turbine generator |
| CN110797910B (en) * | 2019-10-28 | 2023-06-02 | 天津大学 | Control method for improving low voltage ride through capability of matrix converter system |
| CN110797910A (en) * | 2019-10-28 | 2020-02-14 | 天津大学 | Control method for improving low voltage ride through capability of matrix converter system |
| CN110768296B (en) * | 2019-11-18 | 2021-05-18 | 哈尔滨理工大学 | System for improving low voltage ride through capability of double-fed pumped storage unit and control method thereof |
| CN110768296A (en) * | 2019-11-18 | 2020-02-07 | 哈尔滨理工大学 | System for improving low voltage ride through capability of double-fed pumped storage unit and control method thereof |
| CN110957761A (en) * | 2019-12-09 | 2020-04-03 | 太原理工大学 | Brushless doubly-fed wind generator symmetrical high-voltage sudden-rise fault ride-through method based on improved flux linkage tracking control method |
| CN110957761B (en) * | 2019-12-09 | 2022-07-19 | 太原理工大学 | Brushless doubly-fed wind generator symmetrical high-voltage sudden-rise fault ride-through method based on improved flux linkage tracking control method |
| CN115800372A (en) * | 2022-12-07 | 2023-03-14 | 山东电力工程咨询院有限公司 | Direct-current bus superposition type double-fed forced excitation converter based on TAB and method |
| CN115800372B (en) * | 2022-12-07 | 2023-06-23 | 山东电力工程咨询院有限公司 | Direct-current bus superposition type doubly-fed forced excitation converter and method based on TAB |
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Application publication date: 20170315 |