CN110086203A - Sending end power grid double-fed blower based on direct-current commutation failure identification is low to wear control method - Google Patents

Sending end power grid double-fed blower based on direct-current commutation failure identification is low to wear control method Download PDF

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CN110086203A
CN110086203A CN201910441878.1A CN201910441878A CN110086203A CN 110086203 A CN110086203 A CN 110086203A CN 201910441878 A CN201910441878 A CN 201910441878A CN 110086203 A CN110086203 A CN 110086203A
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double
fan motor
motor unit
lcc
fed fan
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CN110086203B (en
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欧阳金鑫
郑迪
熊小伏
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Chongqing University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H02J3/50—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
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Multiple Motors (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

Control method is worn the invention discloses the sending end power grid double-fed blower identified based on direct-current commutation failure is low, comprising: the real-time set end voltage of detection double-fed fan motor unit and critical set end voltage when calculating LCC-HVDC commutation failure；If set end voltage drops near critical set end voltage, double-fed fan motor unit keeps control mode constant and waits LCC-HVDC Inverter Station signal of communication, determines whether to start idle control according to whether LCC-HVDC Inverter Station occurs commutation failure；If commutation failure does not occur for LCC-HVDC Inverter Station, double-fed fan motor unit starts idle control, otherwise remains stable state control strategy until high voltage crossing control starting.This method can make double-fed fan motor unit control system automatic distinguishing LCC-HVDC Inverter Station commutation failure and sending end electric network fault and use different control modes, under the premise of meeting that wind-powered electricity generation is low to wear standard to the maximum extent, the rising and its caused unit high pressure off-grid problem of sending end power grid double-fed fan motor unit set end voltage as much as possible under alleviation LCC-HVDC Inverter Station commutation failure.

Description

Sending end power grid double-fed blower based on direct-current commutation failure identification is low to wear control method
Technical field
The present invention relates to protecting electrical power systems and control field, and in particular to a kind of sending based on direct-current commutation failure identification Power grid double-fed blower is low wears control method at end.
Background technique
The pressure of shortage and the environmental protection of fossil energy promotes the development of the new energy power supply such as wind-powered electricity generation.Become using line commutation Flow HVDC transmission system (the Line Commutation Converter High Voltage Direct of device Current, LCC-HVDC) wind-powered electricity generation is delivered to remote load center is a kind of economic and efficient solution.Due to LCC-HVDC is using half control type device as switch element, and in receiving end AC network failure, commutation mistake may occur for its Inverter Station It loses.After commutation failure occurs, the reactive power first increases and then decreases that converting plant absorbs, so as to cause sending end ac bus voltage and The set end voltage of double-fed fan motor unit first reduces to be increased afterwards.
In sending end power grid AC fault, double-fed fan motor unit set end voltage will persistently fall.According to wind-electricity integration directive/guide Regulation, in network voltage decline, it is 1.5 (0.9-U that Wind turbines should provide size in 75mspcc) dynamic reactive electric current, Wherein UpccFor Wind turbines grid entry point voltage per unit value.In LCC-HVDC commutation failure, double-fed fan motor unit is likewise resulted in Set end voltage falls, and falls degree obviously but the duration is shorter, if double-fed fan motor unit is according to Voltage Drop degree at this time Reactive current is exported, then aggravation be may cause into a large amount of double-fed fan motors in the overvoltage degree of subsequent set end voltage boost phase Unit high pressure off-grid.
The fault ride-through method of existing double-fed fan motor unit is to export reactive current, support network voltage as target, nothing Method distinguishes Voltage Drop caused by sending end electric network fault and LCC-HVDC commutation failure, not in view of output reactive current is to LCC- The adverse effect of set end voltage boost phase when HVDC commutation failure, therefore existing low voltage traversing control method can not be suitable for The case where LCC-HVDC commutation failure.
Therefore, how to realize in LCC-HVDC identify commutation failure and using suitable voltage ride-through control method become give The problem of holding double-fed fan motor unit urgent need to resolve in power grid.
Summary of the invention
Therefore, problem to be solved of the present invention is how to realize to identify commutation failure in LCC-HVDC and using suitable Voltage ride-through control method.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions:
Sending end power grid double-fed blower based on direct-current commutation failure identification is low to wear control method, includes the following steps:
S101, in real time acquisition double-fed fan motor unit set end voltage, as set end voltage amplitude UDLess than grid nodes voltage When minimum allowable value, implementation steps S102；
S102, acquisition double-fed fan motor unit set end voltage fall the reactive power of moment output, double-fed fan motor unit generator terminal Power transmission line electricity between reactive power, double-fed fan motor unit and the LCC-HVDC converting plant ac bus that Voltage Drop moment exports Anti- and double-fed fan motor unit set end voltage falls the voltage magnitude of moment LCC-HVDC converting plant ac bus, and calculates LCC- Double-fed fan motor unit generator terminal critical voltage U when HVDC Inverter Station commutation failureDc, implementation steps S103；
If S103, (1-Kc)UDc≤UD≤(1+Kc)UDc, S104 is thened follow the steps, otherwise, executes step S105, KcFor can By coefficient；
If S104, double-fed fan motor unit control system receive the transmission of LCC-HVDC Inverter Station within the default waiting time Commutation failure signal of communication, then keep double-fed fan motor unit control mode and definite value is constant until double-fed fan motor unit high voltage is worn More control starting, otherwise, implementation steps S105；
S105, double-fed fan motor unit start idle control, and control double-fed fan motor unit is defeated according to the reference value of idle control Reactive power out.
Preferably, the double-fed fan motor unit generator terminal critical voltage in step S102, when LCC-HVDC Inverter Station commutation failure UDcIt is calculated based on following formula:
In formula, PD0Fall the active power of moment output, Q for double-fed fan motor unit set end voltageD0For double-fed fan motor unit Set end voltage falls the reactive power of moment output, XlBetween double-fed fan motor unit and LCC-HVDC converting plant ac bus Power transmission line reactance, ULrFall the voltage magnitude of moment LCC-HVDC converting plant ac bus for double-fed fan motor unit set end voltage；
In formula, NLrFor the every pole inverter number of LCC-HVDC converting plant, NLiFor LCC-HVDC Inverter Station every pole inverter Number, TLrFor sending end AC transformer no-load voltage ratio, TLiFor receiving end AC transformer no-load voltage ratio, XLrFor rectification side commutating reactance, XLiFor inversion Side commutating reactance, ILdThe DC current of LCC-HVDC, γ when to operate normallyminFor the minimum for leading to LCC-HVDC commutation failure Turn off angle, ULiminFor the minimum receiving end ac bus voltage magnitude for leading to LCC-HVDC commutation failure；
In formula, βiIndicate Inverter Station gating advance angle when operating normally.
Preferably, in step S104, double-fed fan motor unit control system receives the commutation that LCC-HVDC Inverter Station is sent and loses The default waiting time for losing signal of communication is calculated as follows:
td=(1+Kd)tlcc
In formula, tlccFor the communication delay of LCC-HVDC Inverter Station to double-fed fan motor unit, KdFor double-fed fan motor unit Control system receives the safety factor for the commutation failure signal of communication waiting time that LCC-HVDC Inverter Station is sent.
Preferably, in step S105, the reference value of the idle control of double-fed fan motor unit is calculated based on following formula
In formula, IQFor the reactive current that double-fed fan motor unit as defined in wind-electricity integration directive/guide should export under electric network fault, IQ =1.5 (0.9-UD)。
In conclusion wearing controlling party the invention discloses the sending end power grid double-fed blower identified based on direct-current commutation failure is low Method includes the following steps: to detect the real-time set end voltage of double-fed fan motor unit and calculates the high-voltage dc transmission of line commutation current transformer Critical set end voltage when electric system (LCC-HVDC) commutation failure；If set end voltage drops near critical set end voltage, double Feedback Wind turbines keep control mode constant and wait LCC-HVDC Inverter Station signal of communication, according to LCC-HVDC Inverter Station whether Commutation failure occurs to determine whether to start idle control；If commutation failure, double-fed fan motor unit do not occur for LCC-HVDC Inverter Station Start idle control, otherwise remains stable state control strategy until high voltage crossing control starting.This method can make double-fed wind Motor set control system automatic distinguishing LCC-HVDC Inverter Station commutation failure and sending end electric network fault simultaneously use different controlling parties Formula is avoided as much as under LCC-HVDC Inverter Station commutation failure under the premise of meeting that wind-powered electricity generation is low to wear standard to the maximum extent The rising of sending end power grid double-fed fan motor unit set end voltage and its caused unit high pressure off-grid problem.This method has simple Effectively, the advantages that Yi Shixian.
Detailed description of the invention
In order to keep the purposes, technical schemes and advantages of invention clearer, the present invention is made into one below in conjunction with attached drawing The detailed description of step, in which:
Fig. 1, which is that the sending end power grid double-fed blower disclosed by the invention based on direct-current commutation failure identification is low, wears control method A kind of flow chart of specific embodiment；
Fig. 2 is a kind of sending end power grid instance graph that double-fed fan motor unit is sent out through LCC-HVDC in the embodiment of the present invention.
Fig. 3 is the low control block diagram for wearing control method of sending end power grid double-fed blower identified based on direct-current commutation failure.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing.
As shown in Figures 1 and 3, it wears the invention discloses the sending end power grid double-fed blower identified based on direct-current commutation failure is low Control method includes the following steps:
S101, in real time acquisition double-fed fan motor unit set end voltage, as set end voltage amplitude UDLess than grid nodes voltage When minimum allowable value, implementation steps S102；
S102, acquisition double-fed fan motor unit set end voltage fall the reactive power of moment output, double-fed fan motor unit generator terminal Power transmission line electricity between reactive power, double-fed fan motor unit and the LCC-HVDC converting plant ac bus that Voltage Drop moment exports Anti- and double-fed fan motor unit set end voltage falls the voltage magnitude of moment LCC-HVDC converting plant ac bus, and calculates LCC- Double-fed fan motor unit generator terminal critical voltage U when HVDC Inverter Station commutation failureDc, implementation steps S103；
If S103, (1-Kc)UDc≤UD≤(1+Kc)UDc, S104 is thened follow the steps, otherwise, executes step S105, KcFor can By coefficient；
If S104, double-fed fan motor unit control system receive the transmission of LCC-HVDC Inverter Station within the default waiting time Commutation failure signal of communication, then keep double-fed fan motor unit control mode and definite value is constant until double-fed fan motor unit high voltage is worn More control starting, otherwise, implementation steps S105；
In the present invention, when commutation failure occurs, Inverter Station can issue commutation failure signal to sending end wind power plant.Work as confirmation After commutation failure occurs, then keep double-fed fan motor unit control mode and definite value constant, with the raising of set end voltage, high voltage Passing through control can start automatically.It is the prior art as set end voltage increases and starts high voltage crossing control automatically, herein not It repeats again.
S105, double-fed fan motor unit start idle control, and control double-fed fan motor unit is defeated according to the reference value of idle control Reactive power out.
Compared with prior art, the present invention is sent for the D.C. high voltage transmission (LCC-HVDC) based on line commutation inverter The set end voltage that end electric network fault and receiving end power grid Inverter Station commutation failure will lead to double-fed fan motor unit in sending end power grid falls Fall, but during electric network fault double-fed fan motor unit set end voltage persistently fall and double-fed fan motor unit machine under Inverter Station commutation failure After the Voltage Drop of end the phenomenon that rapid increase, when double-fed fan motor unit set end voltage Voltage Drop in LCC-HVDC sending end power grid When, double-fed fan motor unit control system automatic distinguishing LCC-HVDC Inverter Station commutation failure and sending end electric network fault, thus according to Different Voltage Drop reasons uses different idle control modes, can be before meeting that wind-powered electricity generation is low to the maximum extent and wearing standard Put, be avoided as much as under LCC-HVDC Inverter Station commutation failure the rising of sending end power grid double-fed fan motor unit set end voltage and Double-fed fan motor unit high pressure off-grid caused by it.
When it is implemented, in step S102, double-fed fan motor unit generator terminal when LCC-HVDC Inverter Station commutation failure is critical Voltage UDcIt is calculated based on following formula:
In formula, PD0Fall the active power of moment output, Q for double-fed fan motor unit set end voltageD0For double-fed fan motor unit Set end voltage falls the reactive power of moment output, XlBetween double-fed fan motor unit and LCC-HVDC converting plant ac bus Power transmission line reactance, ULrFall the voltage magnitude of moment LCC-HVDC converting plant ac bus for double-fed fan motor unit set end voltage；
In formula, NLrFor the every pole inverter number of LCC-HVDC converting plant, NLiFor LCC-HVDC Inverter Station every pole inverter Number, TLrFor sending end AC transformer no-load voltage ratio, TLiFor receiving end AC transformer no-load voltage ratio, XLrFor rectification side commutating reactance, XLiFor inversion Side commutating reactance, ILdThe DC current of LCC-HVDC, γ when to operate normallyminFor the minimum for leading to LCC-HVDC commutation failure Turn off angle, ULiminFor the minimum receiving end ac bus voltage magnitude for leading to LCC-HVDC commutation failure；
In formula, βiIndicate Inverter Station gating advance angle when operating normally.
When it is implemented, double-fed fan motor unit control system receives changing for LCC-HVDC Inverter Station transmission in step S104 The default waiting time of phase failed communication signal is calculated as follows:
td=(1+Kd)tlcc
In formula, tlccFor the communication delay of LCC-HVDC Inverter Station to double-fed fan motor unit, KdFor double-fed fan motor unit Control system receives the waiting time safety factor that the commutation failure signal of communication that LCC-HVDC Inverter Station is sent reserves.
When it is implemented, calculating the reference value of the idle control of double-fed fan motor unit based on following formula in step S105
In formula, IQFor the reactive current that double-fed fan motor unit as defined in wind-electricity integration directive/guide should export under electric network fault, IQ =1.5 (0.9-UD)。
For the sending end power grid that the double-fed fan motor unit disclosed in Fig. 2 is sent out through LCC-HVDC, use is disclosed by the invention The step of method implements fault traversing control to sending end power grid double-fed fan motor unit is as follows:
(1) double-fed fan motor unit parameter, electrical network parameter and LCC-HVDC parameter and operating parameter are obtained；
Double-fed fan motor unit parameter includes:
Intrinsic parameter: rated capacity；Stator and rotor voltage rating；Stator and rotor resistance parameters；Stator and rotor leakage inductance；Magnetizing inductance；It is double Present the maximum allowable rotor current of Wind turbines.
Operating parameter includes: real-time set end voltage；Real-time active and reactive power.
The intrinsic parameter of power grid includes: the power transmission line electricity between double-fed fan motor unit and LCC-HVDC converting plant ac bus It is anti-.
LCC-HVDC parameter includes:
Intrinsic parameter: converting plant and the every pole inverter number of Inverter Station；Sending end and receiving end AC transformer no-load voltage ratio；Rectification side With inverter side commutating reactance；Lead to the minimum turn-off angle of commutation failure；Communication of the LCC-HVDC Inverter Station to double-fed fan motor unit Delay；
Operating parameter: DC current when normal operation；Inverter Station gating advance angle when normal operation.
(2) double-fed fan motor unit set end voltage is acquired in real time, as set end voltage amplitude UDMost less than grid nodes voltage When small permissible value, implementation steps (3)；
(3) according to the operating condition and AC network of Voltage Drop moment, the ginseng of direct current system and double-fed fan motor unit Number calculates double-fed fan motor unit generator terminal critical voltage U when LCC-HVDC Inverter Station commutation failureDc:
In formula, PD0And QD0Respectively double-fed fan motor unit set end voltage fall moment output active and reactive power；Xl For the power transmission line reactance between double-fed fan motor unit and LCC-HVDC converting plant ac bus；ULrFor double-fed fan motor unit generator terminal electricity Pressure falls moment LCC-HVDC converting plant ac bus voltage magnitude:
In formula, NLr、NLiRespectively indicate LCC-HVDC converting plant and the every pole inverter number of Inverter Station；TLrAnd TLiRespectively Sending end and receiving end AC transformer no-load voltage ratio；XLrAnd XLiRespectively indicate rectification side and inverter side commutating reactance；ILdWhen to operate normally The DC current of LCC-HVDC；γminFor the minimum turn-off angle for leading to LCC-HVDC commutation failure；ULiminTo lead to LCC-HVDC The minimum receiving end ac bus voltage magnitude of commutation failure:
Wherein, βiIndicate Inverter Station gating advance angle when operating normally.
(4) compare double-fed fan motor unit set end voltage UDWith generator terminal critical voltage UDcRelationship, when meeting following relationship Implementation steps (5), otherwise implementation steps (6):
(1-Kc)UDc≤UD≤(1+Kc)UDc
In formula, KcThe safety factor reserved for factors such as consideration errors.
(5) if double-fed fan motor unit control system receives changing for LCC-HVDC Inverter Station transmission within the default waiting time Phase failed communication signal then keeps double-fed fan motor unit control mode and definite value constant until double-fed fan motor unit high voltage crossing Control starting, otherwise, implementation steps (6).Wherein double-fed fan motor unit control system receives changing for LCC-HVDC Inverter Station transmission The default waiting time of phase failed communication signal is calculated as follows:
td=(1+Kd)tlcc
In formula, tlccFor the communication delay of LCC-HVDC Inverter Station to double-fed fan motor unit, KdTo receive double-fed fan motor Unit control system receives the waiting time safety factor that the commutation failure signal of communication that LCC-HVDC Inverter Station is sent reserves.
(6) double-fed fan motor unit directly initiates idle control, by double-fed fan motor unit rotor-side converter power outer ring Reactive power reference qref is set asWhereinIt is calculated as follows:
In formula, IQFor the reactive current that double-fed fan motor unit as defined in wind-electricity integration directive/guide should export under electric network fault, IQ =1.5 (0.9-UD)。
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although passing through ginseng According to the preferred embodiment of the present invention, invention has been described, it should be appreciated by those of ordinary skill in the art that can To make various changes to it in the form and details, without departing from the present invention defined by the appended claims Spirit and scope.

Claims (4)

1. the sending end power grid double-fed blower based on direct-current commutation failure identification is low to wear control method, which is characterized in that including as follows Step:
S101, in real time acquisition double-fed fan motor unit set end voltage, as set end voltage amplitude UDMinimum less than grid nodes voltage permits When being worth perhaps, implementation steps S102；
S102, acquisition double-fed fan motor unit set end voltage fall the reactive power of moment output, double-fed fan motor unit set end voltage Fall the reactive power of moment output, the power transmission line reactance between double-fed fan motor unit and LCC-HVDC converting plant ac bus and Double-fed fan motor unit set end voltage falls the voltage magnitude of moment LCC-HVDC converting plant ac bus, and it is inverse to calculate LCC-HVDC Become the double-fed fan motor unit generator terminal critical voltage U when commutation failure of stationDc, implementation steps S103；
If S103, (1-Kc)UDc≤UD≤(1+Kc)UDc, S104 is thened follow the steps, otherwise, executes step S105, KcTo be reliably Number；
If S104, double-fed fan motor unit control system receive the commutation of LCC-HVDC Inverter Station transmission within the default waiting time Failed communication signal then keeps double-fed fan motor unit control mode and definite value constant until the control of double-fed fan motor unit high voltage crossing System starting, otherwise, implementation steps S105；
S105, double-fed fan motor unit start idle control, and control double-fed fan motor unit exports nothing according to the reference value of idle control Function power.
2. as described in claim 1 based on direct-current commutation failure identification sending end power grid double-fed blower it is low wear control method, It is characterized in that, the double-fed fan motor unit generator terminal critical voltage U in step S102, when LCC-HVDC Inverter Station commutation failureDcIt is based on Following formula calculates:
In formula, PD0Fall the active power of moment output, Q for double-fed fan motor unit set end voltageD0For double-fed fan motor unit generator terminal The reactive power of Voltage Drop moment output, XlFor the transmission of electricity between double-fed fan motor unit and LCC-HVDC converting plant ac bus Line reactance, ULrFall the voltage magnitude of moment LCC-HVDC converting plant ac bus for double-fed fan motor unit set end voltage；
In formula, NLrFor the every pole inverter number of LCC-HVDC converting plant, NLiFor the every pole inverter number of LCC-HVDC Inverter Station, TLrFor sending end AC transformer no-load voltage ratio, TLiFor receiving end AC transformer no-load voltage ratio, XLrFor rectification side commutating reactance, XLiFor inverter side Commutating reactance, ILdThe DC current of LCC-HVDC, γ when to operate normallyminTo cause the minimum of LCC-HVDC commutation failure to close The angle of rupture, ULiminFor the minimum receiving end ac bus voltage magnitude for leading to LCC-HVDC commutation failure；
In formula, βiIndicate Inverter Station gating advance angle when operating normally.
3. as described in claim 1 based on direct-current commutation failure identification sending end power grid double-fed blower it is low wear control method, It is characterized in that, in step S104, double-fed fan motor unit control system receives the commutation failure communication that LCC-HVDC Inverter Station is sent The default waiting time of signal is calculated as follows:
td=(1+Kd)tlcc
In formula, tlccFor the communication delay of LCC-HVDC Inverter Station to double-fed fan motor unit, KdFor double-fed fan motor unit control System receives the safety factor for the commutation failure signal of communication waiting time that LCC-HVDC Inverter Station is sent.
4. as described in claim 1 based on direct-current commutation failure identification sending end power grid double-fed blower it is low wear control method, It is characterized in that, in step S105, the reference value of the idle control of double-fed fan motor unit is calculated based on following formula
In formula, IQFor the reactive current that double-fed fan motor unit as defined in wind-electricity integration directive/guide should export under electric network fault, IQ= 1.5(0.9-UD)。
CN201910441878.1A 2019-05-24 2019-05-24 Low-penetration control method for double-fed fan of sending-end power grid based on direct-current commutation failure recognition Active CN110086203B (en)

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Publication number Priority date Publication date Assignee Title
CN114696373A (en) * 2022-05-05 2022-07-01 华北电力大学 Reactive power dispersion cooperative control method
CN114696373B (en) * 2022-05-05 2024-07-05 华北电力大学 Reactive power dispersion cooperative control method

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