CN106410844B - A kind of improved double fed induction generators low voltage traversing control method - Google Patents
A kind of improved double fed induction generators low voltage traversing control method Download PDFInfo
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- CN106410844B CN106410844B CN201610890893.0A CN201610890893A CN106410844B CN 106410844 B CN106410844 B CN 106410844B CN 201610890893 A CN201610890893 A CN 201610890893A CN 106410844 B CN106410844 B CN 106410844B
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000006698 induction Effects 0.000 title claims abstract description 23
- 238000013016 damping Methods 0.000 claims abstract description 22
- 230000001360 synchronised effect Effects 0.000 claims abstract description 14
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 claims description 13
- 238000004804 winding Methods 0.000 claims description 9
- 230000003068 static effect Effects 0.000 claims description 8
- 230000005284 excitation Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 13
- 230000005347 demagnetization Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- 230000008033 biological extinction Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 230000003534 oscillatory effect Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- H02J3/386—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
A kind of improved double fed induction generators low voltage traversing control method, is added stator damp resistance throw-cut device between the double fed induction generators stator and power grid, the stator damp resistance throw-cut device is realized by bidirectional thyristor and damping resistance parallel connection；When being normally incorporated into the power networks, driving bidirectional thyristor conducting, stator current injects power grid by thyristor；When grid voltage sags, thyristor is disconnected, and stator side is grid-connected by damping resistance；Using the current loop controller of rotor current ring and parallel-connection structure under positive sequence synchronous rotating frame.The present invention provides a kind of improved double fed induction generators low voltage traversing control method accelerated stator magnetic linkage demagnetization process, improve control characteristic of unit during low voltage crossing.
Description
Technical field
The present invention relates to the control method of double fed induction generators, especially a kind of double fed induction generators low voltage crossing
Control method.
Background technique
With being continuously increased for wind-powered electricity generation permeability, a large amount of units are cut out from power grid will lead to network re-active power and idle function
The serious imbalance of rate, thus bring disturbance can make entire grid stability be deteriorated, can be by single fault progression when serious
For multiple failure.Therefore, wind-electricity integration criterion calls, when network voltage rapid drawdown, Wind turbines need to keep being incorporated into the power networks, and to
Power grid provides certain reactive power support, helps network voltage to be lifted and then helps the recovery of network voltage；Meanwhile in network voltage
After recovery, Wind turbines want that normal operating condition can be promptly restored to, and to power grid active power of output, so that " passing through " is electric
The low-voltage region of net.
In wind-power market, Double-feed wind power unit is one of main force's type, drives type compared to straight, simultaneously due to double feedback electric engine
Stator is directly connected to power grid when net, and low voltage crossing control is relative complex.
When power grid causes stator voltage to be fallen because of short trouble, since motor magnetic linkage cannot be mutated, stator magnetic linkage at this time
Into transient state transient process.If stator magnetic linkage is oriented decomposition according to stator voltage angular frequency, in the rotating coordinate system
Under, stator magnetic linkage transient characterisitics show as the oscillatory extinction of last longer, which is existed by motor gas-gap magnetic field
Corresponding induced electromotive force is generated on Stator and Rotor Windings, with the increase of Voltage Drop depth, stator magnetic linkage oscillation amplitude also phase
It should become larger, induced electromotive force also increases with it, and generates high current in electric machine rotor winding, will lead to wind turbine when serious
Group shuts down off-grid because of overcurrent protection.
Currently, double-fed fan motor unit mostly uses the low voltage crossing scheme based on crow bar (Crowbar) circuit.Work as electricity
When net Voltage Drop, rotor current transformer is bypassed by Crowbar circuit, rotor is shorted by Crowbar resistance, fixed to turn
Electron current is reduced rapidly, and after rotor current is reduced to controlled range, is restored rotor current transformer and is controlled and control rotor voltage
Reactive power is sent out to power grid.However, incision Crowbar circuit, which easily causes set grid-connection point, inhales reactive power, to network voltage
Recovery has an adverse effect；Simultaneously as the underdamping characteristic of stator magnetic linkage so that the oscillatory extinction process of stator magnetic linkage compared with
It is long, it is difficult preferably to complete stator and rotor current in low-voltage when using traditional vector control algorithm based on stator voltage vector oriented
Control in crossing process.
Summary of the invention
In order to overcome, the stator magnetic linkage demagnetization process of existing double fed induction generators low voltage traversing control method is too long, controls
The poor deficiency of characteristic processed, the present invention provide a kind of quickening stator magnetic linkage demagnetization process, improve unit in low voltage crossing process
In control characteristic improved double fed induction generators low voltage traversing control method.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of improved double fed induction generators low voltage traversing control method, the double fed induction generators stator and electricity
Stator damp resistance throw-cut device is added between net, the stator damp resistance throw-cut device is by bidirectional thyristor and damping resistance
Parallel connection is realized；When being normally incorporated into the power networks, driving bidirectional thyristor conducting, stator current injects power grid by thyristor；Work as power grid
When Voltage Drop, thyristor is disconnected, and stator side is grid-connected by damping resistance；Using the rotor electricity under positive sequence synchronous rotating frame
Flow the current loop controller of ring and parallel-connection structure.
Further, in the stator damp resistance throw-cut device, by the stator magnetic linkage damping time constant of setting, institute is chosen
State stator resistance RsdSize, formula are as follows:
Wherein, τsFor the stator magnetic linkage damping time constant of design, RsFor motor stator winding resistance, LmFor motor excitation
Inductance, LsFor motor stator inductance, LrFor rotor inductance.
Further, in the rotor current ring, in stator positive sequence synchronous rotating frame, using proportional plus integral control
The mode of device and ratio resonant controller parallel connection realizes the control to rotor positive-negative sequence current；
Controller Gcontroller(s) design formula are as follows:
Wherein, kp1,ki1For pi controller parameter, kp2,ki2For ratio resonant controller parameter, ω1For stator electricity
Pressure rotation angular frequency.
Further, the access ratio resonance in parallel on the electric current loop proportional and integral controller of positive sequence synchronous rotating frame
Adjuster, and resonance frequency is designed as 2 times of positive sequence voltage frequency, for controlling the negative sequence component in rotor current.
Using improved rotor feed-forward voltage algorithm, rotor voltage is compensated under two-phase stationary coordinate system, is improved
The control characteristic of rotor current；
Improved feed-forward voltage Δ ur_α,Δur_β, using the stator voltage u under static (α β) coordinate system of two-phases_α, us_β,
Stator current is_α, is_β, rotor current ir_α, ir_βAngular frequency is rotated with motorrIt is calculated
Wherein, LmFor motor excitation inductance, LsFor motor stator inductance,For the stator magnetic linkage under α β coordinate system,
Its calculation formula is:
Technical concept of the invention are as follows: when short circuit malfunction causes stator voltage to be fallen, by stator magnetic linkage
Transient analysis it is found that in order to during accelerating low voltage crossing stator oscillation magnetic linkage the rate of decay, motor stator side concatenate one
It is a can switching damping resistance, which is realized by bidirectional thyristor and damping resistance parallel connection.When being normally incorporated into the power networks, driving is double
To turn on thyristors, stator current injects power grid by thyristor；When grid voltage sags, thyristor is disconnected, and stator side is logical
Overdamp resistance is grid-connected.
Analysis is it is found that stator magnetic linkage time constant are as follows:
Wherein, during low voltage crossing, R 's=Rs+RsdFor the sum of motor stator resistance and stator damping resistance.
Required R ' can be obtained after setting damping time constant appropriatesValue, and then obtain required damping resistance parameter.
It, will be by it usually using Crowbar circuit in order to protect rotor current transformer when big value, which occurs, in network voltage to be fallen
Road, after Crowbar is cut out, rotor current controller needs to adjust given value of current and injects idle requirement to power grid to meet.
However, after the electric discharge demagnetization process of short time, although stator magnetic linkage has been decreased to smaller value during Crowbar is cut,
But its oscillatory extinction process is not over yet, and the induced electromotive force in winding is still larger.At this point, fixed using traditional stator voltage
To vector control algorithm when, be limited by the limited control ability of rotor current ring controller, will be containing big in stator and rotor current
The harmonic component of amount will lead to the overcurrent protection of rotor current transformer and then unit low voltage crossing caused to fail when serious.
If addition and the reversed feed-forward voltage of the induced electromotive force in rotor control voltage, can be effectively improved and turn to fixed
The control of electron current.Therefore, rotor feed-forward voltage algorithm is optimized using the method for stator flux observer.
Traditional rotor voltage control algolithm based on stator voltage vector oriented may be expressed as:
Wherein, kp,kiFor rotor current ring proportional integration (PI) regulator parameter, Δ ird,ΔirqFor dq axis rotor current
Error, ird,irqFor dq axis rotor current, LeFor rotor equivalent inductance, LmFor magnetizing inductance, LsFor stator inductance, LrFor rotor electricity
Sense, ωsFor slip frequency, ω1For network voltage angular frequency, usFor stator positive sequence voltage peak value.
Electric voltage feed forward item in rotor voltage control algolithm shown in formula (1) has ignored stator magnetic linkage dynamic process to controlling
The influence of energy.For this purpose, obtaining improved rotor voltage control algolithm using the method for stator flux observer are as follows:
Wherein, Δ urα,ΔurβFor improved rotor voltage feedforward term, can be obtained in conjunction with voltage equation
The observation of formula (3) stator magnetic linkage can be obtained by stator magnetic linkage equation, in order to avoid phaselocked loop dynamic process is to feedforward
The influence of voltage calculates the feed-forward voltage using the electricity under static (α β) coordinate system of two-phase.
When unbalanced fault occurs in power grid, stator voltage will contain negative sequence component.At this point, if respectively according to positive-negative sequence point
It is controlled from positive and negative order components of the method for orientation to rotor current, then required computationally intensive, rotor current ring control structure
It is complicated；For this purpose, by rotor current ring design are as follows: in parallel on the electric current loop proportional and integral controller of positive sequence synchronous rotating frame
Access ratio resonant regulator, and resonance frequency is designed as 2 times of positive sequence voltage frequency, it is negative in rotor current for controlling
Order components.
Beneficial effects of the present invention are mainly manifested in: 1, during low voltage crossing, stator accesses damping resistance, accelerates stator
The demagnetization process of magnetic linkage improves control characteristic of unit during low voltage crossing.2, the design of rotor current loop is examined
Network voltage negative sequence component is considered, current loop controller is designed as pi controller and ratio resonant controller is in parallel
Mode avoids positive and negative to rotor current progress so that completing the control to negative sequence component under positive sequence synchronous rotating frame
The operation of sequence separation, simplifies algorithm routine；3, improved rotor voltage feedforward arithmetic, it is contemplated that the dynamic mistake of stator magnetic linkage
Journey, while influence of the phaselocked loop dynamic process to feed-forward voltage is avoided, greatly improve control precision.
Detailed description of the invention
Fig. 1 is improved doubly fed induction generator low voltage crossing control block diagram.
Fig. 2 is rotor current ring control block diagram.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Referring to Figures 1 and 2, a kind of improved double fed induction generators low voltage traversing control method, the double-fed induction
Stator damp resistance throw-cut device is added between generator unit stator and power grid, the stator damp resistance throw-cut device is by two-way crystalline substance
Brake tube and damping resistance parallel connection are realized；When being normally incorporated into the power networks, driving bidirectional thyristor conducting, stator current is infused by thyristor
Enter power grid；When grid voltage sags, thyristor is disconnected, and stator side is grid-connected by damping resistance；
Using the current loop controller of rotor current ring and parallel-connection structure under positive sequence synchronous rotating frame.
Further, in the stator damp resistance throw-cut device, by the stator magnetic linkage damping time constant of setting, institute is chosen
State stator resistance RsdSize, formula are as follows:
Wherein, τsFor the stator magnetic linkage damping time constant of design, RsFor motor stator winding resistance, LmFor motor excitation
Inductance, LsFor motor stator inductance, LrFor rotor inductance.
Further, in the rotor current ring, in stator positive sequence synchronous rotating frame, using proportional plus integral control
The mode of device and ratio resonant controller parallel connection realizes the control to rotor positive-negative sequence current；
Controller Gcontroller(s) design formula are as follows:
Wherein, kp1,ki1For pi controller parameter, kp2,ki2For ratio resonant controller parameter, ω1For stator electricity
Pressure rotation angular frequency.
Further, the access ratio resonance in parallel on the electric current loop proportional and integral controller of positive sequence synchronous rotating frame
Adjuster, and resonance frequency is designed as 2 times of positive sequence voltage frequency, for controlling the negative sequence component in rotor current.
Using improved rotor feed-forward voltage algorithm, rotor voltage is compensated under two-phase stationary coordinate system, is improved
The control characteristic of rotor current；
Improved feed-forward voltage Δ ur_α,Δur_β, using the stator voltage u under static (α β) coordinate system of two-phases_α, us_β,
Stator current is_α, is_β, rotor current ir_α, ir_βAngular frequency is rotated with motorrIt is calculated
Wherein, LmFor motor excitation inductance, LsFor motor stator inductance,For the stator magnetic linkage under α β coordinate system,
Its calculation formula is:
In the improved doubly fed induction generator low voltage crossing control block diagram of Fig. 1, the control of doubly fed induction generator low voltage crossing
System, including three phase network 100, double feedback electric engine 101, current transformer 102, stator damp resistance throw-cut device 103, phaselocked loop 104,
Stator voltage electric current clarke converter unit 105, stator active power/reactive power calculate unit 106, rotor current
Clarke/park converter unit 107, power outer ring 108, rotor current inner ring 109, rotor feed-forward voltage computing unit 110,
SVPWM modulates computing unit 111, Crowbar circuit 112.
Three phase network 100 is three-phase alternating-current supply of the power grid 35KV bus after 35KV/690V transformer.Double-fed induction hair
The rotor windings of motor 101 connect the rotor current transformer of current transformer 102, and stator winding connects three by stator resistance switching device 103
Phase power grid 100, three phase network 100 connect the grid-side converter of current transformer 102 simultaneously.
The design formula of damping resistance in stator damp resistance throw-cut device 103 are as follows:
Wherein, τsFor the stator magnetic linkage damping time constant of design.
PLL phaselocked loop 104 carries out phase locked track to 101 stator voltage of doubly fed induction generator, obtains the rotation of power grid positive sequence voltage
Corner frequency ω1, subtract rotor angular velocity of rotation ωrAfter obtain slip angular frequency and angle, θr。
Stator voltage/electric current clarke converter unit 105 passes through the threephase stator voltage that sampling obtains and stator current
Coordinate transform obtains two-phase voltage and current value u in static (α β) coordinate system of two-phases_α,us_βAnd is_α,is_β。
Stator active power/reactive power calculates the voltage that unit 106 is obtained using stator voltage/electric current clarke105
Current value calculates stator active power and reactive power, calculating formula in real time are as follows:
The three-phase rotor current that rotor current clarke/park converter unit 107 obtains sampling is converted by clarke
Two-phase rotor current i is obtained under to two-phase stationary coordinate systemr_α,ir_β, the slip angle, θ that is obtained in conjunction with PLL phaselocked loop 104r, benefit
It is converted with park and transforms to rotor current under positive sequence synchronous rotary dq coordinate system, obtain dq axis rotor current ird,irq。
Stator voltage and stator current signal and the rotor electricity that stator voltage/electric current clarke converter unit 105 is obtained
The rotor current signal that stream clarke/park converter unit 107 obtains is passed to rotor feed-forward voltage computing unit 110, in conjunction with electricity
Machine rotor angular velocity of rotation ωrObtain improved rotor voltage feed-forward signal Δ under static (alpha-beta) coordinate system of two-phase
ur_α,Δur_β, calculating formula are as follows:
Wherein,
Power outer ring 108 is by level demand signal Pref,QrefIt is obtained with active power/reactive power calculating 106 real-time
Active power and reactive power value obtain the error signal of stator active power and reactive power after subtracting each other respectively.
108 use ratio integral controller (PI) of power outer ring to the error signal of stator active power and reactive power into
Row proportional plus integral control, the signal of controller output is multiplied by obtaining the Setting signal of rotor current, and and rotor after coefficient Ls/Lm
The rotor current i that electric current clarke/park transformation 107 obtainsrd,irqSubtract each other to obtain rotor current error.Rotor current error warp
109 controller controller of rotor current inner ring obtains rotor control voltage after calculating.
SVPWM modulation calculates 111 and rotor is controlled voltage ur_abcModulation generate PWM modulation signal, by driving circuit come
Control the conducting of switching device in the rotor current transformer of current transformer 102.
When system is normally incorporated into the power networks, the output of power outer ring 108 is given as rotor current inner ring 109；Work as network voltage
When big value is fallen, in order to protect in current transformer 102 rotor current transformer not overcurrent, Crowbar circuit 112 is by 102 transfer of current transformer
Sub- current transformer bypass, so that electric machine rotor winding repid discharge；When rotor current is reduced to smaller, Crowbar electricity is cut out
Road, rotor current transformer restore control, and current transformer enters low voltage crossing state of a control, and during which power outer ring 108 will be shielded, only
There is the work of rotor current inner ring 109 to be switched to power outer loop control mode again after network voltage recovery.
In Fig. 2 rotor current ring control block diagram, including current inner loop controller 201；Rotor controls voltage computation unit
202；Controller output signal processing unit 203；Rotor controls voltage inverse transformation unit 204.
Rotor current is coordinately transformed to obtain positive sequence synchronous rotary by rotor current clarke/park converter unit 107
Rotor current signal i under coordinate systemrd,irq, with rotor current Setting signal Ird_ref,Irq_refSubtract each other to obtain rotor electricity respectively
Stream error signal.
In current inner loop controller 201, proportional plus integral control, controller expression formula are carried out to rotor current error first
Are as follows:
For controlling to rotor current negative sequence component, a ratio in parallel is humorous in the above pi controller
Shake controller, and resonance frequency in ratio resonant controller is designed as 2 times of positive sequence voltage frequency, controller expression formula are as follows:
Rotor current error obtains rotor voltage after proportional integration (PI) controller and ratio resonance (PR) controller
Adjustment signal.
The slip angle, θ that controller output signal processing unit 203 is obtained using PLL phaselocked loop 104rBy current inner loop control
The rotor voltage adjustment signal that device 201 processed obtains transforms under two-phase stationary coordinate system.
Before the signal that rotor control voltage computation unit 202 obtains controller output signal processing unit 203 is with rotor
The output results added of feedthrough voltage computing unit 110 controls voltage inverse transformation unit 205 via rotor and sits from two-phase static (α β)
After mark system transforms to three-phase natural system of coordinates, rotor control voltage u is obtainedra,urb,urc.It can be effectively improved according to above method
Control characteristic of double feedback electric engine during low voltage crossing.
Claims (4)
1. a kind of improved double fed induction generators low voltage traversing control method, it is characterised in that: the double-fed induction power generation
Stator damp resistance throw-cut device is added between machine stator and power grid, the stator damp resistance throw-cut device is by bidirectional thyristor
It is realized with damping resistance parallel connection；When being normally incorporated into the power networks, driving bidirectional thyristor conducting, stator current injects electricity by thyristor
Net；When grid voltage sags, thyristor is disconnected, and stator side is grid-connected by damping resistance；
Using the current loop controller of rotor current ring and parallel-connection structure under positive sequence synchronous rotating frame；
In the stator damp resistance throw-cut device, by the stator magnetic linkage damping time constant of setting, stator resistance R is chosensd's
Size, formula are as follows:
Wherein, τsFor the stator magnetic linkage damping time constant of design, RsFor motor stator winding resistance, LmFor motor excitation inductance,
LsFor motor stator inductance, LrFor rotor inductance.
2. improved double fed induction generators low voltage traversing control method as described in claim 1, it is characterised in that: described
In rotor current ring, in stator positive sequence synchronous rotating frame, simultaneously using pi controller and ratio resonant controller
The mode of connection realizes the control to rotor positive-negative sequence current；
Controller Gcontroller(s) design formula are as follows:
Wherein, kp1,ki1For pi controller parameter, kp2,ki2For ratio resonant controller parameter, ω1For stator voltage rotation
Corner frequency.
3. improved double fed induction generators low voltage traversing control method as claimed in claim 2, it is characterised in that: just
Access ratio resonant regulator in parallel on the electric current loop proportional and integral controller of sequence synchronous rotating frame, and resonance frequency is set
2 times of positive sequence voltage frequency are calculated as, for controlling the negative sequence component in rotor current.
4. improved double fed induction generators low voltage traversing control method as described in claim 1, it is characterised in that: use
Improved rotor feed-forward voltage algorithm, compensates rotor voltage under two-phase stationary coordinate system, improves the control of rotor current
Characteristic processed；
Improved feed-forward voltage Δ ur_α,Δur_β, using the stator voltage u under static (α β) coordinate system of two-phases_α, us_β, stator
Electric current is_α, is_β, rotor current ir_α, ir_βAngular frequency is rotated with motorrIt is calculated
Wherein, LmFor motor excitation inductance, LsFor motor stator inductance,For determining under static (α β) coordinate system of two-phase
Sub- magnetic linkage, its calculation formula is:
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| EP3937368A1 (en) | 2020-07-08 | 2022-01-12 | Siemens Aktiengesellschaft | Systems comprising a double fed induction machine and a fly wheel, and methods of operating such systems |
| CN113420526B (en) * | 2021-07-05 | 2023-07-28 | 中国科学院电工研究所 | Real-time simulation modeling method, system and equipment for sectional power supply linear induction motor |
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| CN201726157U (en) * | 2010-08-24 | 2011-01-26 | 哈尔滨威瀚电气设备股份有限公司 | Low voltage ride through adjusting device for wind power generation |
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| CN102738830B (en) * | 2012-07-03 | 2014-10-08 | 国家电网公司 | Concentrated fault traversing device for wind power station |
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