CN103560517A - Doubly-fed wind generator low voltage ride through method - Google Patents

Doubly-fed wind generator low voltage ride through method Download PDF

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CN103560517A
CN103560517A CN201310445580.0A CN201310445580A CN103560517A CN 103560517 A CN103560517 A CN 103560517A CN 201310445580 A CN201310445580 A CN 201310445580A CN 103560517 A CN103560517 A CN 103560517A
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voltage
rotor
current transformer
side converter
sequence
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CN103560517B (en
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徐其惠
苏昭晖
辛旺
王波
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Dongfang Electric Automatic Control Engineering Co Ltd
DEC Dongfang Turbine Co Ltd
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Sichuan Dongfang Electric Autocontrol Engineering Co ltd
DEC Dongfang Turbine Co Ltd
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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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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Abstract

The invention provides a doubly-fed wind generator low voltage ride through method. The method specifically comprises the steps that the limit amplitude value output is conducted on the negative sequence component of rotor voltage according to the maximum controllable rotor voltage of a converter; after the limit amplitude value output is conducted, a grid-side converter operates on the basis of the maximum limit amplitude value of the given current, partial differential voltage energy between the negative sequence component of the rotor voltage and the negative sequence control voltage part of a machine-side converter is input into a power grid through the grid-side converter as far as possible; in addition, the partial differential voltage energy is released through a chopper device; after the power grid voltage is recovered, a converter of a doubly-fed draught fan is switched to the normal power control, and normal stable operation of the power grid is facilitated. According to the doubly-fed wind generator low voltage ride through method, the safety of the doubly-fed wind power converter can be effectively ensured when deep asymmetric short circuit faults occur, continuous operation of a doubly-fed wind generator can be ensured in the breakdown period, low voltage ride through is successfully achieved, and active power and reactive power are poured into the power grid in the falling process.

Description

Double-fed blower fan low-voltage ride-through method
Technical field
The present invention relates to low-voltage ride-through method, specifically a kind of megawatt level wind power generation current transformer is in the operation and control method of the line voltage degree of depth is asymmetric while falling low voltage crossing, guarantee wind turbine generator not off-grid operation when electric network fault, meet the low voltage crossing requirement that national grid is promulgated.
Background technology
Along with the continuous increase of installed capacity of wind-driven power, there is transformation in the status of wind-powered electricity generation in electric power system.Installed capacity of wind-driven power hour, can not consider the impact of the stability of a system by its operation; Increasing when installed capacity of wind-driven power, when in system, proportion increases year by year, its operation becomes and can not be ignored the impact of the stability of a system.
In order to guarantee the safe and stable operation of electric power system, some electric power associations or the grid company of Europe, North America and Australia have all been formulated the grid-connected technology guide rule of blower fan, mainly comprise: mains frequency control, reactive power and line voltage control, low voltage crossing (LVRT) control and quality of power supply control etc.
National grid has been published low voltage crossing standard (LVRT) at present, and concrete curve is shown in Fig. 1.
Wherein, the object that low voltage crossing (LVRT) is controlled is: in order to make wind power generation be applied on a large scale, and not entail dangers to the stable operation of electrical network.When electrical network generation voltage falls fault, within the specific limits, blower fan must not depart from electrical network, and will, as conventional unit, to electrical network, provide active power (frequency) and reactive power (voltage) to support.
The double-fed wind power generator that prior art is produced, because generator unit stator is directly connected with electrical network, line voltage falls and will cause rotor-side overvoltage and overcurrent.Although configured crow bar protective circuit (passive crowbar), be that a kind of voltage falls the frequency converter safeguard measure while occurring, after action, must shut down, can not realize low voltage crossing (LVRT).
After the wind energy turbine set low voltage crossing standard implementation that State Grid Corporation of China promulgates, the double-fed fan converter that does not possess low voltage crossing requirement will no longer be received by electrical network, therefore the active crow bar of research and development low voltage crossing is significant to realize low voltage crossing, has a extensive future.
Summary of the invention
The object of the invention is to: when asymmetric the falling of a kind of line voltage degree of depth is provided, the method for double-fed blower fan low voltage crossing, to reach the object of the safety and stability of current transformer direct-current chain and power cell under various electrical network operating modes.
The technical solution adopted in the present invention is:
Double-fed blower fan low-voltage ride-through method, after the current transformer of double-fed blower fan detects that the line voltage degree of depth is asymmetric and falls, drop into crowbar and impact to discharge the moment over-voltage and over-current producing due to motor coupling, avoids current transformer damage; After the DC component of electromagnetic impact decays substantially, starter motor side converter controls generating set and injects meritorious and reactive power reliably to electrical network; When pusher side current transformer can not be controlled according to normal positive-negative sequence algorithm, adopt the positive sequence component of the policy control rotor voltage of preferential positive sequence, because the negative sequence component of rotor voltage is greater than the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment; Now:
(1) negative sequence component of rotor voltage carries out amplitude limit value output, reduces rotor negative sequence voltage as much as possible and be greater than the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment according to the maximum controlled rotor voltage of current transformer;
(2) after amplitude limit value output, remaining pressure difference energy born by net side converter and chopper device, realizes the reliable control of wind-driven generator; Concrete:
Net side converter is with the restriction amplitude operation of the given electric current of maximum, the pressure difference energy that the negative sequence component of rotor voltage is greater than to pusher side current transformer negative phase-sequence control voltage segment is sent into electrical network by net side converter as much as possible, to guarantee the safety of current transformer DC bus; Meanwhile, use chopper device to discharge this part pressure difference energy, with stable DC busbar voltage, be no more than hardware protection value;
(3), after line voltage recovers, the current transformer of double-fed blower fan switches to the normal stable operation that normal power is controlled, is beneficial to electrical network.
In described step (2), the given electric current of maximum of net side converter is power cell short-time overload electric current.
In described step (2), when rotor negative sequence voltage is excessive, net side converter be still can not send whole pressure difference energy with the given electric current operation of maximum time, chopper device is perseveration in whole fault traversing process, discharges residue pressure difference energy.
The beneficial effect that the present invention produces is:
When asymmetric the falling of the line voltage generation degree of depth, rotor negative sequence voltage amplitude is very large, normal current transformer DC bus-bar voltage (1100V left and right) is cannot provide corresponding rotor to control voltage according to space vector adjustment method (SVPWM), thereby make normal current transformer control algolithm (see Fig. 6, 7) cannot meet the needs of control, and adopt above-mentioned control method, pusher side current transformer with the preferential control method of positive sequence after, can effectively control motor gains merit and idle adjusting, and can not control voltage amplitude limit and lose the effective control to motor due to rotor, while is for the negative sequence component part of rotor voltage, pusher side current transformer carries out amplitude limit value output according to the maximum controlled rotor voltage of current transformer (1100/1.414=778V), out-of-control words can not be sent outside and cause DC bus overvoltage to be shut down due to energy, can not realize low voltage crossing (see figure 9), need net side converter to be greater than to electrical network transport portion rotor negative sequence voltage the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment simultaneously, and chopper device consumes part rotor negative sequence voltage and is greater than the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment while needing.If net side converter capacity is enough large, can rotor voltage negative phase-sequence energy be sent into electrical network by enough large net side converter electric current, thereby avoid DC bus overvoltage and shut down, specifically see Figure 10,11; And in fact due to restrictions such as capacity; net side converter capacity can not be infinitely great; so when net side converter is moved with maximum current; also need to coordinate chopper device; DC bus in whole low voltage crossing process is all moved in the scope of a safety, specifically see Figure 12,13, by effective control of pusher side and net side converter; coordinate the protective effect of chopper device, the fault traversing while successfully having realized asymmetric the falling of the line voltage generation degree of depth.
Accompanying drawing explanation
Fig. 1 is low voltage crossing standard (LVRT) curve chart;
Electric network fault schematic diagram during the actual wind field low voltage crossing of Fig. 2;
Fig. 3 is the wind turbine generator system construction drawing that low voltage ride through device is housed;
Fig. 4 is double-fed wind energy converter low voltage ride through device schematic diagram;
Fig. 5 is the topology diagram of active crowbar device, direct-current chain chopper device;
Fig. 6 is wind-powered electricity generation double-feed current transformer net side converter power control block diagram;
Fig. 7 is wind-powered electricity generation double-feed current transformer pusher side current transformer power control block diagram;
Low voltage crossing control flow schematic diagram when Fig. 8 is electrical network degree of depth unbalanced fault;
Fig. 9 is that the negative sequence component part of rotor voltage does not add DC bus overvoltage shutdown data while controlling
Figure 10 is the voltage data that net side converter capacity when enough large, degree of depth unbalanced fault pass through DC bus;
Figure 11 is the current data that net side converter capacity when enough large, degree of depth unbalanced fault pass through net side converter;
When Figure 12 is actual Converter Capacity, degree of depth unbalanced fault passes through the voltage data of DC bus;
When Figure 13 is actual Converter Capacity, the current data of degree of depth unbalanced fault net side converter.
Embodiment
As shown in Fig. 2～10; the present invention is a kind of double-fed blower fan low-voltage ride-through method (Low Voltage Ride Through; LVRT); the present invention can effectively protect the safety of double-fed wind energy converter when degree of depth asymmetry short circuit fault; can between age at failure, guarantee the uninterrupted operation of double-fed wind power generator simultaneously; successfully realize low voltage crossing, and to electrical network, inject meritorious and reactive power in falling process.
After the current transformer of double-fed blower fan detects that the line voltage degree of depth is asymmetric and falls, drop into crowbar rapidly and impact to discharge the moment over-voltage and over-current producing due to motor coupling, avoid current transformer damage.After the DC component of electromagnetic impact decays substantially, starter motor side converter controls generating set and injects meritorious and reactive power reliably to electrical network.Due to the Electromagnetic Coupling Characteristic of motor, in stator voltage, occur seriously when asymmetric, can produce very high negative sequence voltage in rotor side, this negative sequence voltage gently causes pusher side current transformer out of control, heavy cause current transformer damage and can not realize low voltage crossing.
Therefore, the invention provides a kind of double-fed blower fan low-voltage ride-through method, concrete:
For guaranteeing that generating set injects meritorious and reactive power reliably to electrical network, when pusher side current transformer can not be controlled according to normal positive-negative sequence algorithm, adopt the positive sequence component of the policy control rotor voltage of preferential positive sequence, because the negative sequence component of rotor voltage is greater than the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment; Now:
(1) negative sequence component of rotor voltage carries out amplitude limit value output, reduces rotor negative sequence voltage as much as possible and be greater than the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment according to the maximum controlled rotor voltage of current transformer;
(2) after amplitude limit value output, remaining pressure difference energy born by net side converter and chopper device, realizes the reliable control of wind-driven generator; Concrete:
Net side converter is with the restriction amplitude operation of the given electric current of maximum, the pressure difference energy that the negative sequence component of rotor voltage is greater than to pusher side current transformer negative phase-sequence control voltage segment is sent into electrical network by net side converter as much as possible, to guarantee the safety of current transformer DC bus., at net side converter, be adjusted in the process of maximum current meanwhile, use chopper device to discharge this part pressure difference energy, with stable DC busbar voltage, be no more than hardware protection value.
In this embodiment, the given electric current of the maximum of net side converter is power cell short-time overload electric current.
It should be noted that: different for the part parameter of electric machine, while making the excessive situation of rotor negative sequence voltage, net side converter still can not be sent whole pressure difference energies with the given electric current of maximum (being power cell short-time overload electric current) operation, chopper device is perseveration in whole fault traversing process, discharges residue pressure difference energy.
In entire depth unbalanced fault passes through, by means of the coordinated of pusher side current transformer, net side converter, crowbar and chopper device, control, to guarantee feasibility and the reliability of double-fed blower fan low voltage crossing.
(3), after line voltage recovers, the current transformer of double-fed blower fan switches to the normal stable operation that normal power is controlled, is beneficial to electrical network.
With a specific embodiment, illustrate below:
Line voltage degree of depth unbalanced fault in this embodiment is: two phase voltage short circuits drop to 0.2pu.Now, calculate known: line voltage negative sequence component is 0.26pu according to symmetrical component method, for the motor that during wind-powered electricity generation unit Operation at full power, rotating speed 1800rpm(is synchronous speed for 1500rpm, revolutional slip s is-0.2, and motor opening voltage U k=2000V); According to the known rotor negative sequence voltage of double feedback electric engine characteristic, be (2-s) * Uk*0.26=2.2*2000*0.26=1144V.
And double-fed wind energy converter busbar voltage is subject to IGBT device property (specified 1700V) to be restricted to 1100Vdc; protection voltage is 1250Vdc, known according to space vector modulation algorithm (SVPWM): the controlled high rotor voltage of pusher side current transformer is 1100/1.414=778V.Consider that pusher side current transformer also needs to control positive sequence rotor voltage to meet needs meritorious and that reactive power regulates, so the rotor negative phase-sequence control voltage that pusher side current transformer can regulate is far smaller than the real negative sequence voltage 1144V of motor.
Therefore when line voltage degree of depth unbalanced fault, pusher side current transformer can not be controlled according to normal algorithm, certainly exists rotor negative sequence voltage simultaneously and is greater than the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment.
When line voltage degree of depth unbalanced fault, pusher side current transformer can not be controlled according to normal algorithm, adopt the normal strategy of controlling of preferential positive sequence rotor voltage to realize the normal control of generator positive sequence component, guarantee that generating set injects meritorious and reactive power to electrical network.Then negative phase-sequence rotor voltage carries out amplitude limit value output according to the maximum controlled rotor voltage of current transformer (1100/1.414=778V), reduce as much as possible above-mentioned rotor negative sequence voltage and be greater than the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment, and residue pressure difference energy need to net side converter and chopper device process.
Now, net side converter can not be according to conventional control algolithm rated condition operation (if 1.5MW wind turbine networking side converter rated current is 305A), and need to net side converter Current Limits be fixed on to maximum given electric current, (be power cell short-time overload electric current, if 1.5MW wind-powered electricity generation unit current transformer is 720A) amplitude limit value operation, the pressure difference energy that rotor negative sequence voltage is greater than to pusher side current transformer negative phase-sequence control voltage segment is sent into electrical network to guarantee the safety of current transformer DC bus by net side converter as much as possible.
It (is power cell short-time overload electric current that chopper device is not adjusted to electric current maximum given electric current at net side converter; if 1.5MW wind-powered electricity generation unit current transformer is 720A) time; discharge rotor negative sequence voltage and be greater than the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment, with stable DC busbar voltage, be no more than hardware protection value (1250V).After net side converter electric current is adjusted to maximum given electric current, mainly rely on net side converter to carry this part pressure difference energy to electrical network.For part parameter of electric machine difference, cause the situation that rotor negative sequence voltage is larger, net side converter still can not be sent whole pressure difference energies with the given electric current operation of maximum, now, also need chopper device in whole fault traversing process perseveration, discharge residue pressure difference energy.
As shown in Figure 2, dual feedback wind power generation system boosts to 35kV by step-up transformer to actual double-fed wind-force wind energy turbine set major loop, then by overhead transmission line or cable, delivers to booster stations, and the tie point of test low voltage crossing performance also as shown in Figure 2.In order to meet the low voltage crossing of national grid regulation, require (specifically seeing Fig. 1), designed the wind-driven generator group system (specifically seeing Fig. 3) that low voltage ride through device is housed, for double-fed wind energy converter has designed low voltage ride through device, its principle and topology diagram are shown in respectively Fig. 4 and Fig. 5 simultaneously.
When electrical network generation asymmetry short circuit fault causes the rapid drawdown of wind energy turbine set busbar voltage, because DFIG stator is directly connected with electrical network, the sudden change of line voltage will directly be passed to DFIG machine end, DFIG stator voltage is undergone mutation, and then cause occurring in generator unit stator magnetic linkage transient DC component and negative sequence component.Pass after fault between each component of generator unit stator magnetic linkage and each component of stator voltage is:
ψ s ′ = ψ sDC ′ + ψ sP ′ + ψ sN ′ = ( U s jω - U sP ′ jω - U sN ′ - jω ) e - t / τ s + u sP ′ jω + u sN ′ - jω - - - ( 1 )
In formula: ψ ' sfor generator unit stator flux linkage space vector after fault, ψ ' sDCfor the space vector of generator unit stator magnetic linkage transient DC component after fault, ψ ' sPand ψ ' sNbe respectively the space vector of generator unit stator magnetic linkage positive and negative sequence component after fault, U sfor before fault moment generator unit stator space vector of voltage, U' sPand U' sNthe space vector that is respectively the generator unit stator voltage positive and negative sequence component of moment after fault, ω is stator electric angle frequency, τ sfor the damping time constant of generator unit stator magnetic linkage transient DC component, u' sPand u' sNbe respectively the space vector of generator unit stator voltage positive and negative sequence component after fault.
Under rotor reference axis system, when rotor winding cutting stator magnetic field, each order component of DFIG stator field corresponding electromotive force of inducting in rotor winding:
u rP r = | u sP ′ | · L m L s · s · e jsωt u rN r = | u sN ′ | · L m L s · ( 2 - s ) · e - j ( 2 - s ) ωt u rDC r = - jω r L m L s · ( U s jω - U sP ′ jω - U sN ′ - jω ) · e - t / τ s · e - j ω r t - - - ( 2 )
In formula:
Figure BDA0000388202410000062
and
Figure BDA0000388202410000063
be respectively the electromotive force that DFIG stator field positive sequence component, negative sequence component and transient DC component are inducted in rotor-side; S is revolutional slip.
When asymmetric the falling of the line voltage generation degree of depth, motor stator voltage can be decomposed into positive sequence (ω according to symmetrical component method 0line voltage fundamental positive sequence angular velocity of rotation) and negative sequence voltage component (ω 0line voltage fundamental positive sequence angular velocity of rotation), for for the asynchronous machine of certain revolutional slip (s) operation, rotor voltage also can be decomposed into positive sequence (ω according to symmetrical component method s) and negative sequence voltage component ((2-s) ω 0). for 1.5MW double-fed wind power generator, rotor openings voltage 2000V left and right, revolutional slip s is approximately-0.2 simultaneously, from the visible rotor negative sequence voltage of formula 2, is (2-s) * U k* 0.26=2.2*2000*0.26=1144V, negative sequence voltage amplitude is very large, normal current transformer DC bus-bar voltage (1100V left and right) is cannot provide corresponding rotor to control voltage according to space vector adjustment method (SVPWM), if or according to the two closed-loop controls of conventional rotor voltage positive-negative sequence, can be because rotor control voltage amplitude limit loses the effective control to motor, this programme adopts pusher side current transformer with the preferential control method of positive sequence for this reason, guarantee the reliability that positive sequence is controlled and negative sequence voltage carries out amplitude limit value output according to the maximum controlled rotor voltage of current transformer (1100/1.414=778V), so can effectively control motor gains merit and idle adjusting.
Negative sequence component part for rotor voltage; the rotor negative phase-sequence that pusher side current transformer can regulate is controlled voltage and is far smaller than the real negative sequence voltage 1144V of motor; therefore when line voltage degree of depth unbalanced fault; certainly exist rotor negative sequence voltage and be greater than the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment; if out-of-control words can not be sent outside and cause DC bus overvoltage to be shut down due to energy; can not realize low voltage crossing (see figure 9), thus need to net side converter and chopper device combine and suppress rotor negative phase-sequence energy.If net side converter capacity is enough large, can rotor voltage negative phase-sequence energy be sent into electrical network by enough large net side converter electric current, thereby avoid DC bus overvoltage and shut down, specifically see Figure 10,11; And in fact due to the restriction of double-feed current transformer capacity etc.; net side converter capacity can not be infinitely great; when so this programme moves net side converter with maximum current; also need to coordinate chopper device; DC bus in whole low voltage crossing process is all moved in the scope of a safety; specifically see Figure 12,13; by effective control of pusher side and net side converter; coordinate the protective effect of chopper device, the fault traversing while successfully having realized asymmetric the falling of the line voltage generation degree of depth.

Claims (3)

1. double-fed blower fan low-voltage ride-through method, after the current transformer of double-fed blower fan detects that the line voltage degree of depth is asymmetric and falls, drop into crowbar and impact to discharge the moment over-voltage and over-current producing due to motor coupling, avoids current transformer damage; After the DC component of electromagnetic impact decays substantially, starter motor side converter controls generating set and injects meritorious and reactive power reliably to electrical network; It is characterized in that, when pusher side current transformer can not be controlled according to normal positive-negative sequence algorithm, adopt the positive sequence component of the policy control rotor voltage of preferential positive sequence, because the negative sequence component of rotor voltage is greater than the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment; Now:
(1) negative sequence component of rotor voltage carries out amplitude limit value output, reduces rotor negative sequence voltage as much as possible and be greater than the pressure difference energy that pusher side current transformer negative phase-sequence is controlled voltage segment according to the maximum controlled rotor voltage of current transformer;
(2) after amplitude limit value output, remaining pressure difference energy born by net side converter and chopper device, realizes the reliable control of wind-driven generator; Concrete:
Net side converter is with the restriction amplitude operation of the given electric current of maximum, the pressure difference energy that the negative sequence component of rotor voltage is greater than to pusher side current transformer negative phase-sequence control voltage segment is sent into electrical network by net side converter as much as possible, to guarantee the safety of current transformer DC bus; Meanwhile, use chopper device to discharge this part pressure difference energy, with stable DC busbar voltage, be no more than hardware protection value;
(3), after line voltage recovers, the current transformer of double-fed blower fan switches to the normal stable operation that normal power is controlled, is beneficial to electrical network.
2. double-fed blower fan low-voltage ride-through method according to claim 1, is characterized in that, in described step (2), the given electric current of maximum of net side converter is power cell short-time overload electric current.
3. double-fed blower fan low-voltage ride-through method according to claim 1, it is characterized in that, in described step (2), when rotor negative sequence voltage is excessive, net side converter be still can not send whole pressure difference energy with the given electric current operation of maximum time, chopper device is perseveration in whole fault traversing process, discharges residue pressure difference energy.
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CN104868497B (en) * 2015-06-01 2017-07-11 华中科技大学 A kind of control method and system of the double-fed blower fan low voltage crossing without flux observation
CN105048497A (en) * 2015-07-13 2015-11-11 国家电网公司 Doubly-fed wind turbine generator low-voltage ride through method
CN105048497B (en) * 2015-07-13 2017-04-19 国家电网公司 Doubly-fed wind turbine generator low-voltage ride through method
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
CN108321809A (en) * 2017-01-18 2018-07-24 华锐风电科技(集团)股份有限公司 Grid voltage three-phase imbalance falls wind power plant dynamic reactive compensating method under failure
CN112713600A (en) * 2019-10-25 2021-04-27 乌本产权有限公司 Method for feeding electrical power into a supply grid and wind turbine
CN112928742A (en) * 2019-12-05 2021-06-08 新疆金风科技股份有限公司 Direct-current bus overvoltage protection method of converter and corresponding controller
CN112928742B (en) * 2019-12-05 2023-09-12 金风科技股份有限公司 Overvoltage protection method for direct-current bus of converter and corresponding controller
CN113067363A (en) * 2021-05-08 2021-07-02 西安西电电力***有限公司 Control method of multi-end offshore wind power flexible direct current sending-out system
CN113067363B (en) * 2021-05-08 2023-12-08 西安西电电力***有限公司 Control method of multi-terminal offshore wind power flexible direct current output system
WO2023178574A1 (en) * 2022-03-23 2023-09-28 华为数字能源技术有限公司 Power supply system, three-phase inverter, controller of three-phase inverter, and control method

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