CN109256798A - DFIG system passes through operation method under a kind of voltage symmetry failure - Google Patents
DFIG system passes through operation method under a kind of voltage symmetry failure Download PDFInfo
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Abstract
The invention discloses DFIG systems under a kind of voltage symmetry failure to pass through operation method, the grid side setting series connection grid side converter of the DFIG system, the operation method that passes through includes: when symmetric fault occurs for network voltage, it is converted to the positive-sequence component of stator voltage by coordinate, the offset voltage that series connection grid side converter should export is calculated using the positive-sequence component of network voltage and stator voltage；The offset voltage compensation stator voltage and parallel-connection network side converter alternating voltage that should be exported using series connection grid side converter, so that stator voltage, rotor voltage, stator current and rotor current keep pre-fault status, simultaneously parallel-connection network side converter alternating voltage is remained unchanged, and then stable DC busbar voltage.The present invention overcomes the adverse effects caused by dual feedback wind power generation system of electric network fault voltage, prevent Wind turbines off-the-line from power grid in network voltage failure, keep being incorporated into the power networks.
Description
Technical field
The invention belongs to the control technology fields of dual feedback wind power generation system, more particularly, to a kind of voltage symmetry event
Hinder lower DFIG system passes through operation method.
Background technique
With the fast development of power electronics and automatic control technology, using wind-power electricity generation as the renewable energy power generation of representative
Technology achieves significant progress, wherein variable speed constant frequency doubly-fed hair induction machine (Doubly Fed Induction
Generator, DFIG) it can decoupling control, low in cost and high-efficient etc. with good control characteristic, active and reactive power
Advantage, obtained in wind generating technology using increasingly extensive, become the mainstream model of wind power plant, and with large-scale
Wind farm grid-connected, the control technology of DFIG is also ripe day by day.But it is in practical applications, big with DFIG wind energy turbine set installed capacity
Width is promoted, and more and more blower off-grid accidents occur, and these off-grid accidents are mostly not have high electricity due to Wind turbines
Press to wear more (High Voltage Ride Through, HVRT) and low voltage crossing (Low Voltage Ride Through,
LVRT it) ability or only adapts to caused by specific fault condition.When network voltage breaks down, Wind turbines are solved from power grid
Column, no longer provide necessary voltage support for power grid, and then cause a series of chain reaction, jeopardize the safety and stability fortune of power grid
Row.Therefore the operator of various countries proposes a series of wind farm grid-connected regulation and criterion calls in succession, is mainly: 1) wind
Motor group can resist all kinds of electric network faults and maintain to be incorporated into the power networks to provide certain active and reactive power support for power grid；
2) safe and stable operation for the fast quick-recovery and power grid that Wind turbines should be network voltage improves necessary support.
Chinese Magazines " electric power network technique " the 6th phase of volume 32 is entitled " using the double-fed wind power system of series connection grid side converter
High voltage crossing control strategy " discloses dual feedback wind power generation system when network voltage rises sharply using the control method of SGSC,
It points out that, when network voltage rises sharply, stator and rotor can generate overcurrent and over-voltage in this document, jeopardizes unit operation, article uses net
Side converter proposes the control strategy of enhancing high voltage crossing service ability, and when network voltage symmetrically rises sharply, the strategy is logical
The output voltage for crossing same control series connection grid side converter, maintains stator terminal voltage constant, effectively inhibit stator and rotor voltage and
The acute variation of electric current avoids the bad phenomenons such as generator windings fever insulation and the damage of a large amount of power electronic devices.
In addition, this document has also carried out control to PGSC and RSC to maintain DC bus-bar voltage stable and the electromagnetism of DFIG is inhibited to turn
The fluctuation of square and output power overcomes wind power system mechanical axis and ties up to when network voltage rises sharply by greater impact power.But
The above control strategy has the following problems: 1. connecting between grid side converter access net side and stator side, which is only able to maintain
DFIG stator terminal voltage remains unchanged, and PGSC AC system voltage still will receive the influence that network voltage rises sharply；2. PGSC and RSC
It needs to increase control system by further improving the fluctuation that DC bus-bar voltage could be maintained constant and inhibit output power
The computation burden of system.
" IEEE Access " magazine " Improved Fault Ride Through Capability in DFIG
Based Wind Turbines Using Dynamic Voltage Restorer With Combined Feed-Forward
And Feed-Back Control " discloses DFIG system in electric network fault using dynamic electric voltage recovery device (dynamic
Voltage restorer, DVR) control strategy, DVR by between series connection access power grid and dual feedback wind power generation system for mending
Voltage is repaid, by the reasonable control to DVR, enhances ride-through capability of the DFIG system in electric network fault, but in the strategy
The DC bus-bar voltage of DVR needs to provide support with energy-storage units, and system cost is caused to be significantly increased.
It can be seen that there are electric network fault voltages to cause adverse effect, wind-powered electricity generation to dual feedback wind power generation system for the prior art
Unit off-the-line from power grid in network voltage failure, it is difficult to the technical issues of holding is incorporated into the power networks.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides DFIG systems under a kind of voltage symmetry failure
System passes through operation method, and thus solving the prior art, there are electric network fault voltages to cause bad shadow to dual feedback wind power generation system
It rings, Wind turbines off-the-line from power grid in network voltage failure, it is difficult to the technical issues of holding is incorporated into the power networks.
To achieve the above object, the present invention provides DFIG systems under a kind of voltage symmetry failure to pass through operation method,
The grid side setting series connection grid side converter of the DFIG system, the operation method that passes through include:
(1) when symmetric fault occurs for network voltage, it is converted to the positive-sequence component of stator voltage by coordinate, utilizes electricity
The offset voltage that series connection grid side converter should export is calculated in the positive-sequence component of net voltage and stator voltage；
(2) the offset voltage compensation stator voltage that should be exported using series connection grid side converter is exchanged with parallel-connection network side converter
Voltage so that stator voltage, rotor voltage, stator current and rotor current keep pre-fault status, while making parallel-connection network side
Converter alternating voltage remains unchanged, and then stable DC busbar voltage.
Further, series connection grid side converter and back-to-back double PWM controller share same DC link.
Further, step (2) includes:
When grid voltage sags, the offset voltage compensation stator voltage and parallel connection that should be exported using series connection grid side converter
Grid side converter alternating voltage, when network voltage increases, the offset voltage that should be exported using series connection grid side converter is to stator
Voltage and parallel-connection network side converter alternating voltage carry out negative compensation, so that stator voltage, rotor voltage, stator current and rotor
Electric current keeps pre-fault status, while parallel-connection network side converter alternating voltage is remained unchanged, and then stable DC bus electricity
Pressure.
Further, the offset voltage that series connection grid side converter should export are as follows:
Uc=Ucp=U 'gp-Ugp
Wherein, UcIndicate that series connection grid side converter passes through the offset voltage that series transformer should export, UcpIndicate series connection net
The positive sequence voltage component that side converter should compensate, U 'gpIndicate the positive-sequence component of normal symmetrical lower network voltage, UgpIndicate power grid
The positive-sequence component of voltage.
Further, the rotor-side converter and parallel-connection network side converter of DFIG system are sweared using voltage, current double closed-loop
Amount control.
Further, parallel-connection network side converter is used to keep DC capacitor voltage constant and control wind energy conversion system access point
Power factor.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) present invention is using the think of for installing series connection grid side converter (Series Grid Side Converter, SGSC) additional
Road makes DFIG stator voltage under network voltage symmetric fault exchange side voltage with PGSC from the influence of network voltage, in power grid
When voltage is normal, series connection grid side converter does not work, and when network voltage breaks down, series connection grid side converter passes through detection electricity
Net voltage signal simultaneously generates offset voltage by a series of operation, it is ensured that and the stator voltage of DFIG remains unchanged before and after failure,
The stabilization of stator magnetic linkage is maintained, meanwhile, maintain PGSC to exchange side voltage, stable DC busbar voltage, so that DFIG machine
Group possesses outstanding HVRT and LVRT ability, and it is anti-dry under non-ideal network voltage situation to improve dual feedback wind power generation system
Disturb ability.The present invention overcomes the adverse effects caused by dual feedback wind power generation system of electric network fault voltage, prevent Wind turbines
In network voltage failure from power grid off-the-line, keep being incorporated into the power networks.
(2) present invention is on the basis of traditional dual feedback wind power generation system, grid side and dual feedback wind power generation system it
Between install SGSC additional, DC side accesses the DC capacitor link of back-to-back pwm converter, effect be occur in network voltage it is symmetrical
Series voltage is exported by series transformer when failure, so that the voltage of dual feedback wind power generation system is equal to network voltage and compensation
The sum of voltage, by effective control to SGSC so that the voltage of dual feedback wind power generation system is not by the shadow of network voltage failure
It rings, overcomes the bad operation phenomenon such as unstable, electromagnetic torque fluctuation of DFIG stator magnetic linkage, improve DFIG in faulty grids electricity
The stable operating performance of pressure.
(3) present invention considers that influence of the symmetric fault to dual feedback wind power generation system occurs in network voltage, for power grid electricity
There is the problems such as over-voltage and overcurrent or even off-grid in double-fed blower stator and rotor under pressure symmetric fault, analyze and install SGSC maintenance additional
Constant mechanism realizes DFIG system in network voltage by effective control to SGSC before and after DFIG system voltage failure
Occur to keep when symmetric fault with the consistent purpose of normal grid voltage, to maintain DFIG system worked well, this method without
Need other specific safeguard measures, SGSC plays over-voltage or under-voltage protective effect to DFIG, realize DFIG not between
Disconnected operation, enhances ride-through capability of the DFIG system under network voltage symmetric fault.
Detailed description of the invention
Fig. 1 is dual feedback wind power generation system topology diagram provided in an embodiment of the present invention；
Fig. 2 is SGSC control strategy block diagram provided in an embodiment of the present invention；
Fig. 3 is SGSC main compensation circuit topological structure provided in an embodiment of the present invention；
Fig. 4 is PGSC main circuit topological structure figure provided in an embodiment of the present invention；
Fig. 5 is entire dual feedback wind power generation system control block diagram provided in an embodiment of the present invention；
Fig. 6 (a) is the network voltage simulation waveform that the embodiment of the present invention 1 provides；
Fig. 6 (b) is DFIG system voltage simulation waveform before the compensation that the embodiment of the present invention 1 provides；
Fig. 6 (c) is the SGSC output offset voltage simulation waveform that the embodiment of the present invention 1 provides；
Fig. 6 (d) is DFIG system voltage simulation waveform after the compensation that the embodiment of the present invention 1 provides；
Fig. 6 (e) is the stator current simulation waveform that the embodiment of the present invention 1 provides；
Fig. 6 (f) is the rotor current simulation waveform that the embodiment of the present invention 1 provides；
Fig. 6 (g) is the simulation waveform for the DC bus-bar voltage that the embodiment of the present invention 1 provides；
Fig. 6 (h) is the system active power of output simulation waveform that the embodiment of the present invention 1 provides；
Fig. 6 (i) is the system output reactive power simulation waveform that the embodiment of the present invention 1 provides；
Fig. 7 (a) is the network voltage simulation waveform that the embodiment of the present invention 2 provides；
Fig. 7 (b) is DFIG system voltage simulation waveform before the compensation that the embodiment of the present invention 2 provides；
Fig. 7 (c) is the SGSC output offset voltage simulation waveform that the embodiment of the present invention 2 provides；
Fig. 7 (d) is DFIG system voltage simulation waveform after the compensation that the embodiment of the present invention 2 provides；
Fig. 7 (e) is the stator current simulation waveform that the embodiment of the present invention 2 provides；
Fig. 7 (f) is the rotor current simulation waveform that the embodiment of the present invention 2 provides；
Fig. 7 (g) is the simulation waveform for the DC bus-bar voltage that the embodiment of the present invention 2 provides；
Fig. 7 (h) is the system active power of output simulation waveform that the embodiment of the present invention 2 provides；
Fig. 7 (i) is the system output reactive power simulation waveform that the embodiment of the present invention 2 provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
As shown in Figure 1, the dual feedback wind power generation system topology diagram of the installation SGSC of the embodiment of the present invention, whole system
Main includes wind turbine, gear-box, double fed induction generators, RSC, DC filter capacitors, PGSC and installation
SGSC.It is used between series connection access grid side and blower unit by way of transformer after the SGSC warp path filter of installation
In compensating to DFIG system voltage, (voltage of Voltage Drop offset voltage decline, offsets network voltage when voltage increases
Raised voltage).When symmetric fault occurs for network voltage, by effective control to SGSC, it may make that generator unit stator is electric
It is consistent under the conditions of pressure and parallel-connection network side converter exchange side voltage and normal symmetrical network voltage.
SGSC control strategy block diagram as shown in Figure 2, U in figuregabcAnd UcabcRespectively indicate network voltage and SGSC output
Offset voltage；Respectively indicate d, q axis component of the voltage of normal symmetrical power grid under positive dq coordinate system；Subscript α,
β distinguishes α, beta -axis component of the voltage under α β coordinate system.
The present invention provides DFIG systems under a kind of voltage symmetry failure to pass through operation method, the electricity of the DFIG system
Net side setting series connection grid side converter, the operation method that passes through include:
When symmetric fault occurs for network voltage, it is converted to the positive-sequence component of stator voltage by coordinate, utilizes power grid
The offset voltage that series connection grid side converter should export is calculated in the positive-sequence component of voltage and stator voltage；As shown in figure 3, utilizing
The offset voltage compensation stator voltage and parallel-connection network side converter alternating voltage that series connection grid side converter should export, so that stator is electric
Pressure, rotor voltage, stator current and rotor current keep pre-fault status, while parallel-connection network side converter alternating voltage is protected
Hold constant, and then stable DC busbar voltage.
The operation method that passes through specifically includes:
1) SGSC is installed additional between DFIG system and power grid, when symmetric fault occurs in network voltage, detection obtains power grid
The positive-sequence component (symmetric fault is free of negative sequence component) of voltage, is calculated the offset voltage that SGSC should be exported；Work as network voltage
SGSC should export offset voltage expression formula when there is symmetric fault are as follows:
Uc=Ucp=U 'gp-Ugp
2) when symmetric fault occurs in network voltage, voltage keeps three-phase equilibrium, by symmetrical component method it is found that network voltage
In only include positive-sequence component, power grid three-phase voltage is transformed into positive dq coordinate system and obtains d axis componentWith q axis componentIt is a DC component,It is 0.
3) d, q axis component under positive dq coordinate system that SGSC answers output voltage are obtained by following formula operation.
4) by obtained voltage d, q axis component reconvert into three-phase symmetrical coordinate system, the compensation that SGSC should be exported is obtained
Voltage；
5) realize that the compensation to DFIG system voltage controls using the method that stagnant ring compares.
6) DC link of the back-to-back double PWM inverters of the DC side access of SGSC.By series transformer to power grid and
An offset voltage is sealed between DFIG system, so that constant before DFIG system holding failure be equal to voltage rating；
8) DFIG system keeps working normally, and stator voltage, electric current keep failure front and back constant, still remains identical active
It is exported with reactive power, the control strategy of RSC and PGSC are without changing, as shown in figure 4, SGSC control strategy significantly enhances
Ride-through capability of the DFIG system when network voltage breaks down.
As shown in figure 5, conventional power, current double closed-loop vector controlled still can be used in the RSC of dual feedback wind power generation system
Strategy, with realize inverter to the decoupling control of generator speed and active and reactive power, while can control wind energy conversion system maximum
The capture wind energy of limit.During failure, by the control to SGSC, generator unit stator end voltage equally may be implemented and maintain not
Become, then the active power of DFIG stator terminal output can control to remain unchanged, can also be effectively prevented from generator in failure process and turn
The fluctuation of sub- overcurrent and electromagnetic torque.Same PGSC is still with stable DC busbar voltage UdcIt is in failure process for target
The control of each current transformer provides stable DC bus-bar voltage and supports, to improve the transient recovery ability of system.
Illustrated below with two specific examples:
Embodiment 1
For the validity and feasibility for verifying control strategy proposed by the invention, model as shown in Figure 1 has been built.The
One example is that authentication policy enhances DFIG system low-voltage ride-through capability.It is that 12m/s is constant that wind speed, which is arranged, in this example, exports nothing
Function value and power reference is set as 0MVar.0~5s of setting is normal operating condition, and power grid A, B, C three-phase voltage falls simultaneously after 5s
20%, and start SGSC voltage compensation strategy after 5s immediately.
Now Simulation Example result is analyzed to illustrate effectiveness of the invention and feasibility.It can from Fig. 6 (a)
Out, the generation of power grid A, B, C three-phase is symmetrically fallen after 5s, and the peak value of phase voltage drops to 6.53kV by 8.165kV, and Fig. 6 (b) is
Voltage between SGSC and power grid, after transformer converts, the phase voltage peak value of the voltage is reduced to by 563V before after 5s
450V.Fig. 6 (c) is the offset voltage of SGSC output, the phase voltage that SGSC output peak value is 113V after 5s, and A, B, C phase with
Network voltage is identical.By Fig. 6 (d) waveform it is found that by effective control to SGSC, through very short transient process after 5s,
DFIG system voltage is consistent with normal grid voltage before 5s, and the dynamic property of SGSC is good.
By Fig. 6 (e) and Fig. 6 (f) as can be seen that after when 5s uses SGSC voltage compensation strategy immediately, the stator of DFIG with
Rotor current remains unchanged, and there is no need to change the control strategy of RSC, and improves DFIG system in network voltage symmetric fault
Under operation stability.
Fig. 6 (g) gives the simulation waveform of DC bus-bar voltage, and in 5s, capacitance voltage slightly rises, but by of short duration
Adjustment be returned to 0.8kV.Fig. 6 (h) and Fig. 6 (i) give the emulation wave of the total active power of output of system, output reactive power
Shape remains unchanged, and still according to normal control object run, which can greatly improve the low tension ride-through capability of DFIG system.
Embodiment 2
Second example is that authentication policy enhances DFIG system high voltage ride-through capability.Wind speed is equally arranged in this example
12m/s is constant, and output reactive power reference value is set as 0MVar.0~5s of setting is normal operating condition, power grid A, B, C tri- after 5s
Phase voltage raises simultaneously 20%, and starts SGSC voltage compensation strategy after 5s immediately.
From Fig. 7 (a) as can be seen that power grid A, B, C three-phase occurs symmetrically to rise sharply after 5s, the peak value of phase voltage is by 8.165kV
9.798kV is risen to, Fig. 7 (b) is the voltage between SGSC and power grid, after transformer converts, the phase voltage of the voltage after 5s
Peak value rises to 676V by 563V before.Fig. 7 (c) is the offset voltage of SGSC output, and SGSC output peak value is 113V after 5s
Phase voltage, and A, B, C phase are opposite with network voltage.By Fig. 7 (d) waveform it is found that by effective control to SGSC, after 5s
Through very short transient process, DFIG system voltage is consistent with normal grid voltage before 5s, and the dynamic property of SGSC
Well.
By Fig. 7 (e) and Fig. 7 (f) as can be seen that after when 5s uses SGSC voltage compensation strategy immediately, the stator of DFIG with
Rotor current remains unchanged, and there is no need to change the control strategy of RSC, and improves DFIG system in network voltage symmetric fault
Under operation stability.
Fig. 7 (g) gives the simulation waveform of DC bus-bar voltage, and in 5s, capacitance voltage slightly declines, but by of short duration
Adjustment be returned to 0.8kV.Fig. 7 (h) and Fig. 7 (i) give the emulation wave of the total active power of output of system, output reactive power
Shape remains unchanged, and operates normally according to the control target of RSC and PGSC, the high-voltage electricity which significantly enhances DFIG system is worn
More ability.
Specific embodiment is presented above, but the present invention is not limited to embodiment described above.The present invention
Basic ideas be above-mentioned basic scheme, for those of ordinary skill in the art, introduction according to the present invention is designed each
The model of kind deformation, formula, parameter do not need to spend creative work.The case where not departing from the principle and spirit of the invention
Under to embodiment carry out change, modification, replacement and modification still fall in protection scope of the present invention.
Claims (6)
1. DFIG system passes through operation method under a kind of voltage symmetry failure, which is characterized in that the power grid of the DFIG system
Side setting series connection grid side converter, the operation method that passes through include:
(1) when symmetric fault occurs for network voltage, it is converted to the positive-sequence component of stator voltage by coordinate, utilizes power grid electricity
The offset voltage that series connection grid side converter should export is calculated in the positive-sequence component of pressure and stator voltage；
(2) stator voltage and parallel-connection network side converter alternating current are compensated using the offset voltage that series connection grid side converter should export
Pressure so that stator voltage, rotor voltage, stator current and rotor current keep pre-fault status, while becomes parallel-connection network side
Parallel operation alternating voltage remains unchanged, and then stable DC busbar voltage.
2. DFIG system passes through operation method under a kind of voltage symmetry failure as described in claim 1, which is characterized in that institute
It states series connection grid side converter and back-to-back double PWM controller shares same DC link.
3. DFIG system passes through operation method under a kind of voltage symmetry failure as claimed in claim 1 or 2, feature exists
In the step (2) includes:
When grid voltage sags, the offset voltage compensation stator voltage and parallel-connection network side that should be exported using series connection grid side converter
Converter alternating voltage, when network voltage increases, the offset voltage that should be exported using series connection grid side converter is to stator voltage
Negative compensation is carried out with parallel-connection network side converter alternating voltage, so that stator voltage, rotor voltage, stator current and rotor current
Pre-fault status is kept, while parallel-connection network side converter alternating voltage is remained unchanged, and then stable DC busbar voltage.
4. DFIG system passes through operation method under a kind of voltage symmetry failure as claimed in claim 1 or 2, feature exists
In the offset voltage that the series connection grid side converter should export are as follows:
Uc=Ucp=U 'gp-Ugp
Wherein, UcIndicate that series connection grid side converter passes through the offset voltage that series transformer should export, UcpIndicate that series connection net side becomes
The positive sequence voltage component that parallel operation should compensate, U 'gpIndicate the positive-sequence component of normal symmetrical lower network voltage, UgpIndicate network voltage
Positive-sequence component.
5. DFIG system passes through operation method under a kind of voltage symmetry failure as claimed in claim 1 or 2, feature exists
In the rotor-side converter and parallel-connection network side converter of the DFIG system use voltage, current double closed-loop vector controlled.
6. DFIG system passes through operation method under a kind of voltage symmetry failure as claimed in claim 5, which is characterized in that institute
Parallel-connection network side converter is stated for keeping DC capacitor voltage constant and the power factor of control wind energy conversion system access point.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478347A (en) * | 2020-04-13 | 2020-07-31 | 广东电网有限责任公司 | Variable frequency transformer fault ride-through control method and circuit |
| CN114123232A (en) * | 2021-08-20 | 2022-03-01 | 华北电力大学（保定） | Doubly-fed wind turbine generator subsynchronous oscillation suppression method based on linear active disturbance rejection control |
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| CN102005998A (en) * | 2010-11-23 | 2011-04-06 | 中国科学院电工研究所 | Low-voltage ride through circuit of double-feed type wind power generator |
| CN102299524A (en) * | 2011-09-08 | 2011-12-28 | 天津理工大学 | Low voltage ride through (LVRT) control method for doubly fed induction generator (DFIG) wind generating system of series grid-side converter (SGSC) based on static bifurcation control |
| CN103078339A (en) * | 2013-01-29 | 2013-05-01 | 武汉大学 | Low-voltage ride through control system and method for capacity-optimal energy-storage type double-fed motor |
| CN104078999A (en) * | 2014-07-09 | 2014-10-01 | 国网吉林省电力有限公司 | Computing method for double-fed wind power unit overspeed off-grid critical time |
| CN105356520A (en) * | 2015-11-24 | 2016-02-24 | 上海电力学院 | Control method for improving low voltage ride through capability of wind power plant |
| CN106505620A (en) * | 2016-11-25 | 2017-03-15 | 国家电网公司 | A kind of transient state reconfiguration system for improving double-fed fan trouble ride-through capability and control method |
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| CN111478347A (en) * | 2020-04-13 | 2020-07-31 | 广东电网有限责任公司 | Variable frequency transformer fault ride-through control method and circuit |
| CN111478347B (en) * | 2020-04-13 | 2021-08-10 | 广东电网有限责任公司 | Variable frequency transformer fault ride-through control method and circuit |
| CN114123232A (en) * | 2021-08-20 | 2022-03-01 | 华北电力大学（保定） | Doubly-fed wind turbine generator subsynchronous oscillation suppression method based on linear active disturbance rejection control |
| CN114123232B (en) * | 2021-08-20 | 2024-04-26 | 华北电力大学（保定） | Subsynchronous oscillation suppression method for doubly-fed wind turbine based on linear active disturbance rejection control |
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