CN114301103B - Wind storage coordinated direct-drive wind turbine generator control method and system - Google Patents
Wind storage coordinated direct-drive wind turbine generator control method and system Download PDFInfo
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Abstract
The invention provides a direct-drive wind turbine generator control method and system with wind power storage coordination, belongs to the technical field of wind power storage coordination control in a power system, and solves the technical problems that: the prior art fails to comprehensively consider various relevant factors and cannot coordinate the control of the wind turbine generator and the energy storage unit, including: acquiring the frequency of the power system, comparing the frequency with a set first threshold and a set second threshold respectively, and controlling the frequency respectively according to the range; when the frequency of the power system is between a first threshold and a second threshold, the state of charge of the direct-current side energy storage unit is within a set interval; when the frequency of the power system is smaller than a first threshold, providing active power for the frequency response of the wind turbine generator; and when the frequency of the power system is greater than a second threshold value, providing active power for the frequency response of the wind turbine generator, and simultaneously performing variable pitch control through the wind driven generator. According to the invention, the energy storage system is configured on the direct current side of the wind turbine generator, so that the voltage source networking operation of the wind turbine generator can be realized.
Description
Technical Field
The invention belongs to the technical field of wind storage coordination control in a power system, and particularly relates to a wind storage coordinated direct-drive wind turbine generator control method and system.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
A novel power system with new energy as a main body is planned, and higher requirements are provided for the grid-connected operation capacity of the wind turbine generator.
The voltage source grid type wind turbine generator has good weak power grid adaptability and power grid active supporting capacity, is a technical route with great prospect, but the specific implementation scheme of the voltage source grid type wind turbine generator is not clear.
The prior art of wind storage coordination control includes: the wind-storage combined wind power converter and the control method thereof comprise the division of the structure, the control principle and the control sub-mode of the wind-storage combined wind power converter; the frequency modulation method of the wind storage system comprises a control method for adjusting charging and discharging power of stored energy according to system frequency change so as to realize power grid frequency adjustment, and a method for respectively controlling the wind turbine generator and the stored energy of an additional flywheel based on a double-layer coordination technology so as to realize frequency modulation response on a power grid; and the frequency and voltage regulation control method of the wind storage cluster comprises a regulation method for determining active power and reactive power according to wind conditions and the real-time electrical state of the power system, and the like.
The problems existing in the prior art mainly comprise:
On one hand, the prior art is provided based on a conventional control mode of a wind turbine generator, namely a current source type grid-connected control mode. However, with the improvement of the wind power permeability, the wind turbine generator adopting current source grid-connected control cannot ensure the stable operation of the system, and needs to adopt voltage source grid-connected control.
On the other hand, in the prior art, factors such as different working conditions of normal operation and frequency deviation of a power grid and the charge state of an energy storage unit cannot be comprehensively considered to coordinate the control of the wind turbine generator and the energy storage unit, so that the requirement of stable voltage source networking operation of the wind storage coordinated direct-drive wind turbine generator under different operation conditions is met.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a wind storage coordinated direct-drive wind turbine generator control method, which can realize wind storage coordinated direct-drive wind turbine generator voltage source networking operation.
To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
in a first aspect, a method for controlling a direct-drive wind turbine generator with wind storage coordination is disclosed, which comprises the following steps:
acquiring the frequency of the power system, comparing the frequency with a set first threshold and a set second threshold respectively, and controlling the frequency according to the range;
When the frequency of the power system is between a first threshold and a second threshold, the state of charge of the direct-current side energy storage unit is in a set interval, and when the state of charge of the energy storage unit deviates from the interval, the state of charge of the energy storage unit is recovered by controlling the output power of the grid side converter;
when the frequency of the power system is smaller than a first threshold value, the voltage of a direct-current bus is controlled to be constant, the direct-current side energy storage unit discharges spontaneously to provide active power for the frequency response of the wind turbine generator, and when the state of charge is smaller than the lower limit value of the state of charge after discharging, the power grid side converter controls the stop of discharging;
when the frequency of the power system is greater than a second threshold value, the voltage of the direct-current bus is controlled to be constant, the energy storage system is charged spontaneously to provide active power for the frequency response of the wind turbine generator, and meanwhile, the variable pitch control of the wind driven generator is adopted to realize the power reduction operation of the whole wind turbine generator and avoid the overcharge of the direct-current side energy storage unit.
According to the further technical scheme, when the frequency of the power system is between a first threshold value and a second threshold value, the state of charge of the direct-current side energy storage unit is in a set interval, the grid side converter adjusts an active power reference value, the maximum wind energy power captured by the wind driven generator is output, and maximum power tracking operation of the wind turbine generator is carried out.
According to the further technical scheme, the grid-side converter adjusts an active power reference value, and then the main controller of the wind turbine generator controls the motor-side converter to enable the output wind driven generator to capture the maximum wind energy power.
According to the further technical scheme, when the state of charge of the energy storage unit deviates from the interval, the state of charge of the energy storage unit is recovered by controlling the output power of the converter at the side of the power grid, and the method specifically comprises the following steps:
when the state of charge of the energy storage unit is not in the set interval, the grid-side converter adjusts the active power reference value to enable the active power reference value to be smaller than or larger than the maximum wind energy capture power, so that part of wind energy captured by the wind driven generator flows into the energy storage unit or enables the energy storage unit to discharge, and the state of charge of the energy storage unit is adjusted to recover to the required set interval.
According to the further technical scheme, when the frequency of the power system is smaller than a first threshold value, the motor side converter is adjusted to enable the active power output to be
when the maximum power tracking control is carried out, part of the rotor inertia is released to carry out power support, and meanwhile, the main controller of the wind turbine generator is matched to monitor and control the rotating speed of the wind driven generator.
According to the further technical scheme, when the frequency of the power system is smaller than a first threshold value and the state of charge of the direct-current side energy storage unit is larger than an allowed minimum value, the grid-side converter sets reference active power as maximum wind energy capture power, and the active power is provided by direct-current side energy storage discharge and wind generator rotor kinetic energy.
According to the further technical scheme, when the frequency of the power system is smaller than a first threshold value and the state of charge of the energy storage unit on the direct current side is reduced to the minimum value allowed, the converter on the power grid side is adjusted to set the reference active power, so that the reference active power is not provided for the outside, and the wind turbine generator outputs the maximum captured wind energy power.
According to the further technical scheme, when the frequency of the power system is larger than a second threshold value, the power grid side converter sets reference active power as maximum wind energy capture power, and the active power is provided by direct current side energy storage charging and wind driven generator variable pitch control.
According to a further technical scheme, when the frequency of the electric power system is larger than a second threshold value, the pitch angle of the wind generating set is increased, and the active power output of the motor side converter is enabled to be
And reducing the output power of the wind turbine generator to support the frequency.
In a second aspect, a wind storage coordinated direct-drive wind turbine control system is disclosed, comprising:
the system comprises an energy storage side converter, a power grid side converter, a motor side converter and a wind generating set main controller;
a direct current link between the motor side converter and the power grid side converter is connected with an energy storage side converter;
the wind turbine generator main controller acquires the frequency of a power system, compares the frequency with a set first threshold and a set second threshold respectively, and controls the frequency according to the range;
when the frequency of the power system is between a first threshold and a second threshold, the state of charge of the direct-current side energy storage unit is in a set interval, and when the state of charge of the energy storage unit deviates from the interval, the state of charge of the energy storage unit is recovered by controlling the output power of the grid side converter;
when the frequency of the power system is smaller than a first threshold value, the voltage of a direct-current bus is controlled to be constant, the direct-current side energy storage unit spontaneously discharges to provide active power for the frequency response of the wind turbine generator, and when the state of charge is smaller than the lower limit value of the state of charge after discharging, the discharging is controlled to stop through a power grid side converter;
when the frequency of the power system is greater than a second threshold value, the voltage of the direct-current bus is controlled to be constant, the energy storage system is charged spontaneously to provide active power for the frequency response of the wind turbine generator, and meanwhile, the variable pitch control of the wind driven generator is adopted to realize the power reduction operation of the whole wind turbine generator and avoid the overcharge of the direct-current side energy storage unit.
The above one or more technical solutions have the following beneficial effects:
according to the wind turbine generator system, the energy storage system is arranged on the direct current side of the wind turbine generator system, so that the integrated design and coordinated operation of wind storage integration are realized, stable direct current voltage support and power standby are provided by means of energy storage, and the voltage source networking operation of the wind turbine generator system can be realized.
The invention controls the voltage stability of the direct current link by the direct current side energy storage system and provides energy charging and discharging in the frequency response process.
The grid-side converter realizes the networking operation of the voltage source, establishes voltage externally and provides active frequency support.
The invention realizes maximum energy tracking control under a normal operation state by the cooperation of the motor-side converter and the main controller of the wind turbine generator, and provides partial energy support by utilizing the rotation speed adjustment and the pitch angle adjustment of the rotor in the frequency response process.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
FIG. 1 is a schematic view of a direct-drive wind turbine generator with wind power storage coordination according to an embodiment of the invention;
fig. 2 is a voltage source networking control block diagram of a grid-side converter according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a voltage control process of the dc link by the dc-side energy storage system according to the embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example one
The embodiment discloses a direct-drive wind turbine generator control method with wind storage coordination, which comprises the following steps:
in order to realize the control of the wind turbine, the data required to be collected include: grid-connected point three-phase voltageV abcGrid-connected point three-phase currentI abcThe state of charge (SOC) of the energy storage unit, and other conventional collected data required for controlling the normal operation of the wind turbine generator and the energy storage unit.
The utilization mode of the collected data is as follows:
according to the collected grid-connected point three-phase voltageV abcAnd grid point three-phase currentI abcCalculating to obtain the output active power of the wind turbine generatorP eReactive powerQ eAnd voltage measurementV mAnd then the method shown in fig. 2 is adopted to carry out voltage source networking control.
According to the collected grid-connected point three-phase voltageV abcCalculating to obtain electricityAnd the grid frequency is used for controlling the direct-drive wind turbine generator with wind storage coordination according to the control method according to the calculated grid frequency and the acquired charge state of the energy storage unit.
The control flow is as follows:
(1) according to the collected grid-connected point three-phase voltageV abcCalculating to obtain the power grid frequency;
(2) and determining the states of the power grid and the wind generating set according to the calculated power grid frequency and the acquired charge state of the energy storage unit, and respectively controlling the power grid side converter, the direct current side energy storage system, the motor side converter and the wind generating set main controller according to the following method to realize the grid operation of the voltage source of the direct-drive wind generating set with wind storage coordination.
In the direct current link between a motor side converter and a power grid side converter of the direct-drive wind turbine generator, an additional energy storage unit is connected through an energy storage side converter;
The energy storage side converter and the energy storage unit are used for controlling the voltage stability of the direct current link and providing energy charging and discharging in the frequency response process.
The grid side converter adopts a voltage source networking control method:
the motor side converter is cooperated with the wind turbine main controller to realize maximum energy tracking control in a normal operation state, and rotor rotation speed adjustment and pitch angle adjustment are carried out in a frequency response process.
Specifically, the method for controlling the voltage source networking of the wind turbine generator grid-side converter by adopting the method shown in fig. 2 comprises the following steps:
1) normal operation, i.e. detecting the system frequency at [50-Df db, 50+Df db]When (wherein D)f dbFor controlling the dead zone for frequency response), the active power control reference value of the grid-side converter is selected as follows:
wherein DPTo be made ofThe power deviation value determined by manufacturers or operation dispatchers can be determined according to the captured wind power and the charge-discharge power requirement of the energy storage unit, and the purpose is to generate the deviation between the output power of the unit and the captured wind power and obtain the power D through the deviation powerPCharging or discharging the energy storage unit.
When the SOC of the direct current side energy storage unit is (60%, 70%)]When the interval is within, the power grid side converter adjusts the active power reference value and outputs the maximum wind energy power captured by the wind driven generator P MPPTRealizing Maximum Power Point Tracking (MPPT) of the wind turbine generator; when the SOC of the energy storage unit is less than 60% (or more than 70%), the power grid side converter adjusts the active power reference valueP refMake it less than (or greater than) the maximum wind energy capture powerP MPPTSo that part of the wind driven generator captures wind energy and flows into the energy storage unit (or discharges the energy storage unit), and the SOC of the energy storage unit can be adjusted to be recovered to the required (60 percent and 70 percent)]And (4) interval.
2) When the system frequency is detected to be less than 50-Df dbAnd then, selecting an active power control reference value of the power grid side converter according to the following mode:
when the SOC of the direct-current side energy storage unit is larger than the allowable minimum SOCminIn time, the grid-side converter sets the reference active powerP refCapturing power for maximum wind energyP MPPTAt this time, according to the voltage source networking control strategy, a specific control flow is shown in fig. 2, active power support can be provided spontaneously, and the active power is provided by direct-current side energy storage discharge and wind driven generator rotor kinetic energy; when the SOC of the direct current side energy storage unit is reduced to the minimum value SOC allowedminAnd then, the direct-current side energy storage unit cannot continuously support power, and the active power reference is set by adjusting the grid side converter P refSo that the wind turbine generator does not provide additional active power to the outside any more, and the wind turbine generator outputs the captured maximum wind energy powerP MPPT。
3) When the system frequency is detected to be more than 50+ Df dbAnd then, selecting an active power control reference value of the power grid side converter according to the following mode:
grid-side converter set reference active powerP refCapturing power for maximum wind energyP MPPTAnd spontaneously providing active power support according to the voltage source networking type control strategy, wherein the supported active power is provided by direct-current side energy storage charging and wind power generator variable pitch control.
In a more specific example, referring again to fig. 2, the voltage source networking controls a specific control process: in the active power-phase angle control loop, the active power is firstly commandedP refAnd the calculated value of active powerP eThrough a rotor dynamic simulation link, generating an angular velocity deviation Dw=w-w 0Wherein the characteristic represented by the rotor dynamic simulation link can be described asJw 0(dw/dt)=P ref-P e-K p(w-w 0) (ii) a And further by the angular velocity deviation DwAnd rated value of angular velocityw 0Adding to obtain angular velocity control referencew refAnd obtaining a phase angle control reference through an integral linkq ref。
In the reactive power-voltage control loop, first the reactive power is commandedQ refAnd a reactive power calculation value Q eDeviation of, and voltage commandV refAnd voltage measurementV mRespectively go through the proportional linkK qAndK vto obtain a control signalK q×DQAndK v×DV(ii) a Further by the control signalK q×DQAndK v×DVadding the two components, and passing through an integral link,generating an output voltage control deviation DEAnd rated value of output voltageE 0Adding to obtain output voltage control referenceE ref。
Subsequently, the reference is controlled by the phase angleq refAnd an output voltage control referenceE refObtaining the output voltage control reference of dq axis through reference voltage generation and dq coordinate transformation linksE d,refAndE q,refand is referenced to phase angle controlq refAre transmitted to the voltage loop control together; next, a current control reference of dq axis is generated through PI (proportional-integral) in voltage loop controlI d,refAndI q,refand is referenced to phase angle controlq refAre transmitted to the current loop control together; finally, a bridge arm three-phase alternating current voltage control reference is generated through a proportional-integral (PI) link in current loop controle refAnd supplying the PWM link to generate a power electronic switch trigger signal.
Specifically, the method shown in fig. 3 is adopted by the dc-side energy storage system to control the voltage of the dc link, and includes:
1) normal operation, i.e. detecting the system frequency at [50-Df db, 50+Df db]Then, the SOC of the direct current side energy storage unit is required to be (60%, 70%) ]And in the interval, when the SOC of the energy storage unit deviates from the interval, the SOC state is recovered by controlling the output power of the converter on the grid side.
2) When the system frequency is detected to be less than 50-Df dbWhen the wind turbine generator system is in operation, the direct current bus voltage is controlled to be constant, the energy storage system discharges spontaneously to provide active power support for frequency response of the wind turbine generator system, and when the wind turbine generator system discharges to the SOC<SOCminAnd in time, the discharging can be stopped through the control of the power grid side converter.
3) When the system frequency is detected to be more than 50+ Df dbThe wind driven generator pitch control is adopted to realize the power reduction operation of the whole wind driven generator set and avoid the storage of the wind driven generator setThe energy unit is overcharged.
The working process of the motor side converter and the wind generating set main controller is as follows:
1) 1) Normal operation, i.e. detecting the system frequency at [50-Df db, 50 + Df db]In time, MPPT control is adopted to make the active power output be
At the moment, the maximum wind energy power which can be captured by the wind driven generator is outputP MPPT；
2) When the system frequency is detected to be less than 50-Df dbThe motor-side converter is adjusted to have its active power output as
Wherein the content of the first and second substances,P wtan active power control instruction is issued to a motor side converter by a main controller of the wind turbine generator, P MPPTThe maximum wind power that can be captured by the wind turbine,Jfor the virtual inertia parameter of the voltage source networking control (as shown in figure 2),w 0a nominal angular velocity parameter for voltage source networking control,wfor the angular velocity controlled by the voltage source network,dw/dtis the differential of angular velocity with respect to time.
And when MPPT control is carried out, partial rotor inertia is released to support power, and meanwhile, the main controller of the wind turbine generator is matched to monitor and control the rotating speed of the wind driven generator.
3) When the system frequency is detected to be more than 50+ Df dbIncreasing the pitch angle of the wind generating set
And the active power output of the motor side converter is as follows:
and reducing the output power of the wind turbine generator to carry out frequency support.
The voltage source networking type direct-drive wind turbine generator operation control method with coordinated wind storage can realize voltage source networking operation of the direct-drive wind turbine generator, and realize active frequency response of the wind turbine generator to a power grid through coordination of the wind turbine generator and a direct-current side energy storage system.
Example two
The purpose of this embodiment is to provide a direct-drive wind turbine generator control system with wind storage coordination, as shown in fig. 1, including:
the system comprises an energy storage side converter, a power grid side converter, a motor side converter and a wind generating set main controller;
A direct current link between the motor side converter and the power grid side converter is connected with an energy storage side converter;
the wind turbine main controller acquires the frequency of a power system, compares the frequency with a set first threshold and a set second threshold respectively, and controls the frequency according to the range;
when the frequency of the power system is between a first threshold and a second threshold, the state of charge of the direct-current side energy storage unit is in a set interval, and when the state of charge of the energy storage unit deviates from the interval, the state of charge of the energy storage unit is recovered by controlling the output power of the grid-side converter;
when the frequency of the power system is smaller than a first threshold value, the voltage of a direct-current bus is controlled to be constant, the direct-current side energy storage unit spontaneously discharges to provide active power for the frequency response of the wind turbine generator, and when the state of charge is smaller than the lower limit value of the state of charge after discharging, the discharging is controlled to stop through a power grid side converter;
when the frequency of the power system is larger than a second threshold value, the voltage of the direct-current bus is controlled to be constant, the energy storage system is charged spontaneously to provide active power for the frequency response of the wind turbine generator, and meanwhile, the variable pitch control of the wind turbine generator is used for achieving the power reduction operation of the whole wind turbine generator and avoiding the overcharge of the direct-current side energy storage unit.
The invention utilizes the direct current side energy storage system to provide voltage stability control of the direct current link and power reserve in frequency response, and realizes voltage source networking operation of the wind turbine generator. The scheme provided by the invention is cooperated with the energy storage side converter, the power grid side converter, the motor side converter and the wind generating set main controller to operate, so that wind storage coordination is realized.
The wind power generation set main controller and the converter controller are both actual hardware controllers of the set, and the main controller can be regarded as a highest controller in the wind power generation set and used for uniformly performing upper-level regulation and control on wind power capture of a mechanical part of the set, power grid power output of an electrical part and the like. The converter control mainly performs control of grid-connected power, voltage, current and the like aiming at the power electronic grid-connected converter according to a main control command.
In the invention, on the direct current link between the motor side converter and the grid side converter of the conventional direct-drive wind turbine generator, the additional energy storage unit is connected through the energy storage side converter to form wind and storage integrated design and coordinated operation, and the specific control process or working principle of the system is referred to the method of the first embodiment.
The steps involved in the apparatus of the above embodiment correspond to the first embodiment of the method, and the detailed description can be found in the relevant description of the first embodiment.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive changes in the technical solutions of the present invention.
Claims (10)
1. The wind storage coordinated direct-drive wind turbine generator control method is characterized by comprising the following steps:
acquiring the frequency of the power system, comparing the frequency with a set first threshold and a set second threshold respectively, and controlling the frequency respectively according to the range;
when the frequency of the power system is between a first threshold and a second threshold, the state of charge of the direct-current side energy storage unit is in a set interval, and when the state of charge of the energy storage unit deviates from the interval, the state of charge of the energy storage unit is recovered by controlling the output power of the grid side converter;
when the frequency of the power system is smaller than a first threshold value, the voltage of a direct-current bus is controlled to be constant, the direct-current side energy storage unit discharges spontaneously to provide active power for the frequency response of the wind turbine generator, and when the state of charge is smaller than the lower limit value of the state of charge after discharging, the power grid side converter controls the stop of discharging;
When the frequency of the power system is greater than a second threshold value, the voltage of the direct-current bus is controlled to be constant, the energy storage system is charged spontaneously to provide active power for the frequency response of the wind turbine generator, and meanwhile, the variable pitch control of the wind driven generator is adopted to realize the power reduction operation of the whole wind turbine generator and avoid the overcharge of the direct-current side energy storage unit.
2. The method as claimed in claim 1, wherein when the frequency of the power system is between the first threshold and the second threshold, the state of charge of the dc-side energy storage unit is within a predetermined range, and the grid-side converter adjusts the active power reference value to output the maximum wind power captured by the wind turbine generator for maximum power tracking operation of the wind turbine generator.
3. The wind-storage coordinated direct drive wind turbine control method according to claim 2, characterized in that the grid-side converter regulates the active power reference value, after which the wind turbine master controller controls the motor-side converter such that the output wind turbine captures maximum wind power.
4. The wind-storage coordinated direct-drive wind turbine control method according to claim 2, characterized in that when the state of charge of the energy storage unit deviates from the above-mentioned interval, the state of charge of the energy storage unit is restored by controlling the output power of the grid-side converter, specifically:
When the state of charge of the energy storage unit is not in the set interval, the power grid side converter adjusts the active power reference value to enable the active power reference value to be smaller than or larger than the maximum wind energy capture power, so that part of wind energy captured by the wind driven generator flows into the energy storage unit or enables the energy storage unit to discharge, and the state of charge of the energy storage unit is adjusted to be recovered to the required set interval.
5. The method of claim 1, wherein when the frequency of the power system is less than a first threshold, the method adjusts the motor-side converter to have an active power output of
P wtAn active power control instruction is issued by a main controller of the wind turbine generator to a current transformer at the motor side,P MPPTthe maximum wind power that can be captured by the wind turbine,Ja virtual inertia parameter for voltage source networking control,w 0a nominal angular velocity parameter for voltage source networking control,wfor the angular velocity controlled by the voltage source network,dw/dtis the differential of angular velocity with respect to time;
and when the maximum power tracking control is carried out, partial rotor inertia is released to support power, and meanwhile, the main controller of the wind turbine generator is matched to monitor and control the rotating speed of the wind driven generator.
6. The method of claim 1, wherein the grid-side converter sets a reference active power to a maximum wind capture power when the power system frequency is less than a first threshold and when the state of charge of the dc-side energy storage unit is greater than a minimum allowed value, the active power being provided by dc-side energy storage discharge and wind generator rotor kinetic energy.
7. The method as claimed in claim 6, wherein when the frequency of the power system is lower than the first threshold value and the state of charge of the dc-side energy storage unit is reduced to the minimum value allowed, the grid-side converter is adjusted to set the reference active power so that no additional active power is provided to the outside, and the wind turbine outputs the maximum captured wind power.
8. The method as claimed in claim 1, wherein when the frequency of the power system is greater than a second threshold, the grid-side converter sets a reference active power as a maximum wind energy capture power, and the active power is provided by charging the dc-side energy storage and controlling a pitch of the wind turbine generator.
9. The method of claim 1, wherein when the frequency of the power system is greater than a second threshold, the pitch angle of the wind turbine is increased such that the active power output of the generator-side converter is
P wtAn active power control instruction is issued by a main controller of the wind turbine generator to a current transformer at the motor side,P MPPTthe maximum wind power that can be captured by the wind turbine,Ja virtual inertia parameter for voltage source networking control, w 0A nominal angular velocity parameter for voltage source networking control,wfor the angular velocity controlled by the voltage source network,dw/dtis a differential amount of the angular velocity with respect to time,
is the angular velocity deviation;
and reducing the output power of the wind turbine generator to carry out frequency support.
10. The control system for realizing the wind-storage coordinated direct-drive wind turbine generator control method according to any one of claims 1 to 9 is characterized by comprising:
the system comprises an energy storage side converter, a power grid side converter, a motor side converter and a wind generating set main controller;
the direct current link between the motor side converter and the grid side converter is connected with an energy storage side converter
The wind turbine main controller acquires the frequency of a power system, compares the frequency with a set first threshold and a set second threshold respectively, and controls the frequency according to the range;
when the frequency of the power system is between a first threshold and a second threshold, the state of charge of the direct-current side energy storage unit is in a set interval, and when the state of charge of the energy storage unit deviates from the interval, the state of charge of the energy storage unit is recovered by controlling the output power of the grid-side converter;
when the frequency of the power system is smaller than a first threshold value, the voltage of a direct-current bus is controlled to be constant, the direct-current side energy storage unit spontaneously discharges to provide active power for the frequency response of the wind turbine generator, and when the state of charge is smaller than the lower limit value of the state of charge after discharging, the discharging is controlled to stop through a power grid side converter;
When the frequency of the power system is greater than a second threshold value, the voltage of the direct-current bus is controlled to be constant, the energy storage system is charged spontaneously to provide active power for the frequency response of the wind turbine generator, and meanwhile, the variable pitch control of the wind driven generator is adopted to realize the power reduction operation of the whole wind turbine generator and avoid the overcharge of the direct-current side energy storage unit.
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