CN111864764B - Frequency and voltage regulation control system and method for voltage source type wind turbine generator set - Google Patents

Frequency and voltage regulation control system and method for voltage source type wind turbine generator set Download PDF

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CN111864764B
CN111864764B CN202010590432.8A CN202010590432A CN111864764B CN 111864764 B CN111864764 B CN 111864764B CN 202010590432 A CN202010590432 A CN 202010590432A CN 111864764 B CN111864764 B CN 111864764B
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wind turbine
turbine generator
voltage
energy storage
flywheel energy
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CN111864764A (en
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应有
法拉蒂尔
张晓乐
杨靖
孙勇
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Yunda Energy Technology Group Co ltd
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Zhejiang Windey Co Ltd
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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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
    • 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
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

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  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention relates to a frequency modulation and voltage regulation control system and method for a voltage source type wind turbine generator, which comprises a wind turbine generator and a flywheel energy storage unit, wherein the flywheel energy storage unit comprises a flywheel, a motor and a motor frequency converter which are sequentially connected, and a stator grid side converter of the wind turbine generator is electrically connected with the motor frequency converter; the method comprises initializing a controller; calculating a correlation coefficient; calculating reactive power given and active power given required by the fan in grid connection; and distributing active power output and reactive power output to the wind turbine generator and the flywheel energy storage unit. The invention has the advantages that: when the frequency of a power grid changes, according to the influence of the active power output of the wind turbine generator and the flywheel energy storage unit on the frequency of a grid connection point when the active power output changes, the active power output of the wind turbine generator and the flywheel energy storage unit is distributed, and the output of the wind turbine generator is compensated and adjusted; according to the voltage deviation of the power grid, the active power output and reactive power output limits of the wind turbine generator and the active power output and reactive power output limits of the flywheel energy storage unit, the reactive power output of the double-fed generator and the flywheel energy storage unit is automatically distributed, and the voltage amplitude of a grid-connected point is improved.

Description

Frequency and voltage regulation control system and method for voltage source type wind turbine generator set
Technical Field
The invention relates to the technical field of wind power generation, in particular to a frequency and voltage modulation control system of a voltage source type wind turbine generator.
Background
With the improvement of the permeability of a wind turbine Generator in a power grid, a large number of traditional generators are replaced, the equivalent rotational inertia of the system is reduced, and therefore the frequency and voltage disturbance resistance of the whole power system are poor.
The system strategy for tracking the active power given by the main control by the directional vector control of the power grid voltage has the following defects:
1. when the system frequency fluctuates, the frequency can be modulated only by depending on the master control of the wind turbine generator, the response speed is slow, and the system frequency response requirement can be met only by adding an additional frequency modulation means;
2. when the system voltage fluctuates, because the stator side of the double-fed motor is directly connected with the power grid, when the voltage of the grid-connected point is reduced, the stator current is increased in order to follow the power instruction given by the main control, and if other control means are not added, the reactive current injected into the power grid is increased, so that the voltage of the grid-connected point is further dropped.
Disclosure of Invention
The invention mainly overcomes the defect of a control strategy that the active power given by the main control is tracked by the directional vector control of the voltage of a power grid, and provides a frequency modulation and voltage regulation control system and a method for a voltage source type wind turbine generator system, which can be used for quickly responding to the frequency and voltage fluctuation of the system by adding frequency-active and voltage-reactive droop links on a stator power outer ring or simulating a synchronous machine inertia link, a primary frequency modulation link and an inertia link by adopting a virtual synchronous control method.
The technical scheme adopted for solving the technical problem is that the frequency and voltage modulation control system of the voltage source type wind turbine generator comprises a wind turbine generator and a flywheel energy storage unit, wherein the flywheel energy storage unit comprises a flywheel, a motor and a motor frequency converter which are sequentially connected, the stator side of the wind turbine generator is electrically connected with the motor frequency converter, the rotor side of the wind turbine generator is electrically connected with a power grid through a rotor side converter and a power grid side converter in sequence, the control end of the rotor side converter is connected with a rotor side SVPWM generator, the input end of the rotor side SVPWM generator is sequentially connected with a current control ring and a voltage control ring, the control end of the motor frequency converter is connected with the motor SVPWM generator, and the input end of the motor SVPWM generator is connected with the current control ring of the frequency converter.
The flywheel energy storage unit is electrically connected with the wind turbine generator stator grid side converter, and the machine side converter can still control the double-fed generator stator side power output and is decoupled with the power output control of the flywheel energy storage unit.
Correspondingly, the invention also provides a frequency and voltage modulation control method for the voltage source type wind turbine generator system, and the system comprises the following steps:
s1, initializing the controller;
s2, calculating a correlation coefficient;
s3, calculating reactive power setting and active power setting required by the wind turbine generator during grid connection;
and S4, distributing active power output and reactive power output to the wind turbine generator and the flywheel energy storage unit.
As a preferable scheme of the foregoing scheme, in step S2, the correlation coefficient includes an active fluctuation coefficient of the wind turbine generator, an active fluctuation coefficient of the flywheel energy storage unit, and a voltage sensitivity coefficient.
As a preferred scheme of the scheme, expressions of the active fluctuation coefficient of the wind turbine generator and the active fluctuation coefficient of the flywheel energy storage unit are
Figure BDA0002555280860000031
Figure BDA0002555280860000032
Wherein S iswAnd SFRespectively are active power fluctuation coefficients of a voltage source type wind turbine generator set and a flywheel energy storage unit, wherein
Figure BDA0002555280860000033
Shows the influence on the grid-connected point frequency when the active power output of the voltage source type wind turbine generator changes,
Figure BDA0002555280860000034
and the influence on the grid connection point frequency when the active power output of the flywheel energy storage unit changes is shown.
As a preferable mode of the above, the voltage sensitivity coefficient includes SPθ、SQθ、SPUAnd SQUVoltage sensitivity matrix of
Figure BDA0002555280860000035
Figure BDA0002555280860000036
Wherein,
Figure BDA0002555280860000037
ΔPF＝SFΔP-PFactive power changes, P, of the voltage source type wind turbine generator set and the flywheel energy storage unit respectivelywAnd PFRespectively represents the actual active power of the voltage source type wind turbine generator set and the flywheel energy storage unit,
Figure BDA0002555280860000038
the active power setting of the voltage source type wind turbine generator set is shown, delta P is the deviation of the total active power output of the voltage source type wind turbine generator set and the flywheel energy storage unit at the moment and the last moment, theta and U are the phase angle and the amplitude of the voltage of a grid connection point, and delta QwAnd Δ QFRespectively, the reactive power change of the voltage source type wind turbine generator set and the flywheel energy storage unit, SPθ、SQθ、SPUAnd SQUThe letters in the subscript represent the physical quantity of the sensitivity association, P represents the active power, and Q represents the reactive power.
As a preferable scheme of the above scheme, the calculating of the reactive power giving and the active power giving required when the wind turbine is connected to the grid in step S3 includes the following steps:
s31, detecting whether the wind turbine generator is connected to the grid, if so, entering the step S32; if not, ending;
s32, measuring the voltage and current of the grid-connected point, and calculating the frequency and voltage deviation of the grid-connected point;
s33, calculating the required active power setting
Pwref＝Pwref+SwΔP
PFref＝PFref+SFΔP
Wherein, PwrefFor active power provision of wind turbines, PwrefIs a preset value, PFrefFor active power supply of flywheel energy storage unit, PFrefThe initial value of (2) is a preset value;
s34, calculating the total reactive power given
ΔQGeneral assembly＝(ΔU-SPU(ΔPw+ΔPF))/SQU
Wherein, the delta U is the voltage deviation of the grid connection point;
s35, determining the reactive power setting of the wind turbine generator and the reactive power setting of the flywheel energy storage system;
s36, go back to step S31.
As a preferable scheme of the above scheme, the determining the reactive power setting of the wind turbine generator and the reactive power setting of the flywheel energy storage system in step S35 includes the following steps:
s351: given Q for judging reactive power of wind turbine generatorwrefGiven Δ Q with total reactive powerGeneral assemblyWhether the sum is greater than the maximum output reactive power Q of the wind turbine generatorwmaxIf yes, go to step S352; if not, giving the reactive power of the wind turbine generator
Qwref＝Qwref+ΔQGeneral assembly
Wherein
Figure BDA0002555280860000051
PF is the power factor, P, given by the wind turbinewOutputting actual active power, Q, for the wind turbinewrefThe initial value of (2) is a preset value;
s352: make wind turbine generator system idle given Qwref＝QwmaxAnd calculating the idle setting of the flywheel energy storage system
ΔQF＝Qwref+ΔQGeneral assembly-Qwmax ；
S353: judging idle given Q of flywheel energy storage systemFrefSetting idle given delta Q with flywheel energy storage systemFWhether the sum is greater than the maximum output reactive power Q of the flywheel energy storage unitFmaxIf so, QFref＝QFmax(ii) a If not, QFref＝QFref+QFmax(ii) a Wherein
Figure BDA0002555280860000052
SFIs the rated capacity of the motor, PFFor instantaneous active power output by the motor, QFrefThe initial value of (2) is a preset value.
As a preferable scheme of the foregoing scheme, the distributing the active power output and the reactive power output of the wind turbine in step S4 includes the following steps:
s401, obtaining a stator coordinate transformation angle
θ0＝∫(ωgrid-kw(Pwref-Pw))
Wherein, ω isgridGrid frequency, k, for phase-locked loop outputwThe frequency-active droop coefficient of the wind turbine generator is shown as the frequency-active droop coefficient;
s402, obtaining active power P of the statorsAnd reactive power Qs
Figure BDA0002555280860000061
Wherein isabc，usabcStator current and stator voltage abc components, u, respectivelysd，usqDq components, i, of the stator voltage, respectivelysd，isqDq components of the stator current, respectively;
s403: let Pw＝Ps，Qw＝Qs，PwGo back to step S401 while according to QwCalculating a stator voltage reference value Vsref
Vsref＝Vb-kq(Qwref-Qw)
Wherein, V b1 is the rated voltage amplitude of the power grid, kqThe voltage-reactive droop coefficient is the wind generating set voltage-reactive droop coefficient;
s404: the expression of the obtained voltage control loop is as follows:
Figure BDA0002555280860000062
Figure BDA0002555280860000063
the expression for the current control loop is:
Figure BDA0002555280860000064
Figure BDA0002555280860000065
wherein, VsdAnd VsqIs the dq component of the stator voltage, ksdiAdjusting the integral coefficient, k, for stator activitysdpAdjusting the proportionality coefficient, k, for stator activitysqiReactive regulation of the integral coefficient, k, for the statorsqpFor reactive regulation of the proportionality coefficient of the stator, irdAnd irqIs the dq component of the rotor current, krdiAdjusting integral coefficient, k, for rotor powerrdpFor active regulation of the proportionality coefficient, k, of the rotorrqiFor reactive regulation of the integral coefficient, k, of the rotorrqpAnd s is a Laplace operator for the rotor reactive power regulation proportionality coefficient.
As a preferable scheme of the above scheme, when the active power output and the reactive power output of the flywheel energy storage unit are distributed in step S4, the expression of the side current control loop of the frequency converter is
upd＝(kpd+kid/s)(PFref/Up-ipd)
upq＝(kpq+kiq/s)(QFref/Up-ipq)
Wherein, UpFor the amplitude of the voltage at the output of the machine, ipq，ipdOutputting dq component, k, obtained after three-phase current is changed by 3s/2r for motorpdFor active adjustment of the ratio coefficient, kpqFor reactive adjustment of the proportionality coefficient, kidFor active adjustment of the integral coefficient, kiqAnd s is a Laplace operator for a reactive power regulation integral coefficient.
The invention has the advantages that: the flywheel energy storage unit is electrically connected with the stator side of the voltage source type wind turbine generator, and the generator side converter of the wind turbine generator can still control the power output of the stator side of the double-fed generator and is decoupled with the power output control of the flywheel energy storage unit; when the frequency of the power grid changes, automatically distributing the active output of the voltage source type wind turbine generator set and the flywheel energy storage unit according to the influence of the active output of the voltage source type wind turbine generator set and the flywheel energy storage unit on the frequency of a grid connection point when the active output changes, and compensating and adjusting the output of the voltage source type wind turbine generator set; according to the grid voltage deviation, the active power output and reactive power output limits of the voltage source type wind turbine generator set and the active power output and reactive power output limits of the flywheel energy storage unit, the reactive power output of the double-fed generator set and the flywheel energy storage unit is automatically distributed, and the voltage amplitude of a grid-connected point is improved.
Drawings
Fig. 1 is a schematic flow chart of a frequency and voltage modulation control method for a voltage source type wind turbine generator in an embodiment.
Fig. 2 is a schematic flow diagram of active and reactive power setting of the wind turbine generator and the flywheel energy storage unit.
FIG. 3 is a schematic diagram of a wind turbine generator rotor-side converter control algorithm.
FIG. 4 is a schematic diagram of a motor control algorithm.
Detailed Description
The technical solution of the present invention is further described below by way of examples with reference to the accompanying drawings.
Example (b):
the embodiment provides a voltage source type wind turbine generator system frequency modulation and voltage regulation control system, including wind turbine generator system and flywheel energy storage unit, flywheel energy storage unit is including consecutive flywheel FESS, motor PMSM and motor converter, wind turbine generator system stator net side converter links to each other with motor converter electricity, wind turbine generator system rotor side loops through rotor side converter and electric wire netting side converter and electric continuous with the electric wire netting, rotor side converter control end links to each other with rotor side SVPWM generator output, rotor side SVPWM generator input links to each other with current control ring and voltage control ring in proper order, motor converter control end links to each other with motor SVPWM generator output, motor SVPWM generator input links to each other with converter current control ring.
The charge-discharge speed of flywheel energy storage is fast, and the capacity is big, can compensate and adjust voltage source type wind turbine generator system's output, and on the other hand, voltage source type wind turbine generator system stabilizes the grid-connected point voltage through pouring into reactive current into the electric wire netting, but the reactive power of double-fed unit output is subject to the power factor of generator, has certain limitation at the voltage capability of stabilizing grid-connected point, consequently, can make voltage source type wind turbine generator system cooperation flywheel energy storage unit, adjusts system frequency, voltage fluctuation. In the embodiment, the flywheel energy storage unit is electrically connected with the stator network side converter of the voltage source type wind turbine generator system, and the machine side converter can still control the stator side power output of the double-fed generator system and is decoupled with the power output control of the flywheel energy storage unit.
Correspondingly, the embodiment also provides a frequency and voltage modulation and regulation control method for the voltage source type wind turbine generator, and the frequency and voltage modulation and regulation control system for the voltage source type wind turbine generator is adopted, as shown in 1, the frequency and voltage modulation and regulation control method comprises the following steps:
s1, initializing the controller, setting the active power given P of the wind turbine generator during initializationwref0.8, the active power of the flywheel energy storage unit is given by PFrefIs 0, the wind turbine generator and the flywheel energy storage unit give Q without powerwrefAnd QFrefIs 0;
s2, calculating correlation coefficients including wind turbine generator active fluctuation coefficient, flywheel energy storage unit active fluctuation coefficient and voltage sensitivity coefficient, the wind turbine generator active fluctuation coefficient and flywheel energy storage unit active fluctuation coefficient expression is
Figure BDA0002555280860000091
Figure BDA0002555280860000092
Wherein S iswAnd SFRespectively are active power fluctuation coefficients of a voltage source type wind turbine generator set and a flywheel energy storage unit, wherein
Figure BDA0002555280860000093
Shows the influence on the grid-connected point frequency when the active power output of the voltage source type wind turbine generator changes,
Figure BDA0002555280860000094
representing the influence on the grid-connected point frequency when the active output of the flywheel energy storage unit changes;
the voltage sensitivity coefficient includes SPθ、SQθ、SPUAnd SQUVoltage sensitivity matrix of
Figure BDA0002555280860000095
Figure BDA0002555280860000096
Wherein,
Figure BDA0002555280860000101
ΔPF＝SFΔP-PFactive power changes, P, of the voltage source type wind turbine generator set and the flywheel energy storage unit respectivelywAnd PFRespectively represents the actual active power of the voltage source type wind turbine generator set and the flywheel energy storage unit,
Figure BDA0002555280860000102
the active power setting of the voltage source type wind turbine generator set is shown, delta P is the deviation of the total active power output of the voltage source type wind turbine generator set and the flywheel energy storage unit at the moment and the last moment, theta and U are the phase angle and the amplitude of the voltage of a grid connection point, and delta QwAnd Δ QFRespectively, the reactive power change of the voltage source type wind turbine generator set and the flywheel energy storage unit, SPθ、SQθ、SPUAnd SQUThe letters in the subscript represent the physical quantity of the sensitivity association, P represents the active power, and Q represents the reactive power;
s3, calculating reactive power setting and active power setting required by the wind turbine during grid connection, as shown in FIG. 2, the method comprises the following steps:
s31, detecting whether the wind turbine generator is connected to the grid, if so, entering the step S32; if not, ending;
s32, measuring voltage and current of grid-connected point, calculating frequency and voltage deviation of grid-connected point
Figure BDA0002555280860000103
Where Δ f is the system frequency variation, kwIs the frequency-active droop coefficient, k, of the voltage source type wind turbine generator systemFIs the frequency-active droop coefficient, P, of the flywheel energy storage unitwAnd PFRespectively represents the actual active power of the voltage source type wind turbine generator set and the flywheel energy storage unit,
Figure BDA0002555280860000104
the active power setting of the voltage source type wind turbine generator set is shown, delta P is the deviation of the total active power output of the voltage source type wind turbine generator set and the flywheel energy storage unit at the moment and the last moment, and when delta P is used>When 0, the flywheel energy storage unit is in a discharge state SwAnd SFThe active power fluctuation coefficients of the voltage source type wind turbine generator set and the flywheel energy storage unit are respectively;
s33, calculating the required active power setting
Pwref＝Pwref+SwΔP
PFref＝PFref+SFΔP
Wherein, PwrefFor active power provision of wind turbines, PwrefIs 0.8, PFrefFor active power supply of flywheel energy storage unit, PFrefIs 0;
s34, calculating the total reactive power given
ΔQGeneral assembly＝(ΔU-SPU(ΔPw+ΔPF))/SQU
Wherein, delta U is the voltage deviation of the grid-connected point;
s35, determining the reactive power setting of the wind turbine generator and the reactive power setting of the flywheel energy storage system, and specifically comprising the following steps:
s351: given Q for judging reactive power of wind turbine generatorwrefGiven Δ Q with total reactive powerGeneral assemblyWhether the sum is greater than the maximum output reactive power Q of the wind turbine generatorwmaxIf yes, go to step S352; if not, giving the reactive power of the wind turbine generator
Qwref＝Qwref+ΔQGeneral assembly
Wherein
Figure BDA0002555280860000111
PF is the power factor, P, given by the wind turbinewOutputting actual active power, Q, for the wind turbinewrefIs 0;
s352: reactive given Q of wind turbine generatorwref＝QwmaxAnd calculating the idle setting of the flywheel energy storage system
ΔQF＝Qwref+ΔQGeneral assembly-Qwmax ；
S353: judging idle given Q of flywheel energy storage systemFrefSetting idle given delta Q with flywheel energy storage systemFWhether the sum is greater than the maximum output reactive power Q of the flywheel energy storage unitFmaxIf so, QFref＝QFmax(ii) a If not, QFref＝QFref+QFmax(ii) a Wherein
Figure BDA0002555280860000121
SFIs the rated capacity of the motor, PFFor instantaneous active power output by the motor, QFrefThe initial value of (2) is a preset value;
s36, returning to the step S31;
s4, according to the active and reactive power setting of the wind turbine generator and the flywheel energy storage unit obtained in the step S3, the wind turbine generator and the flywheel energy storage unit are distributed with active power output and reactive power output, and when the wind turbine generator is distributed with active power output and reactive power output, as shown in the figure 3, the method comprises the following steps:
s401, obtaining a stator coordinate transformation angle
θ0＝∫(ωgrid-kw(Pwref-Pw))
Wherein, ω isgridGrid frequency, k, for phase-locked loop outputwThe frequency-active droop coefficient of the wind turbine generator is shown as the frequency-active droop coefficient;
s402, obtaining active power P of the statorsAnd reactive power Qs
Figure BDA0002555280860000122
Wherein isabc，usabcStator current and stator voltage, u, respectivelysd，usqRespectively stator voltage dq component, isd，isqRespectively stator current dq components;
s403: let Pw＝Ps，Qw＝Qs，PwReturning to step S401 while according to QwCalculating a stator voltage reference value Vsref
Vsref＝Vb-kq(Qwref-Qw)
Wherein, V b1 is the rated voltage amplitude of the power grid, kqThe voltage-reactive droop coefficient is the voltage-reactive droop coefficient of the wind turbine generator;
s404: the expression of the obtained voltage control loop is as follows:
Figure BDA0002555280860000131
Figure BDA0002555280860000132
the expression for the current control loop is:
Figure BDA0002555280860000133
Figure BDA0002555280860000134
and the rotor side SVPWM generator controls the rotor side converter according to the output of the current control loop. Wherein, VsdAnd VsqIs the dq component of the stator voltage, ksdiAdjusting the integral coefficient, k, for stator activitysdpFor active regulation of the stator proportionality coefficient, ksqiReactive regulation of the integral coefficient, k, for the statorsqpFor reactive regulation of the proportionality coefficient of the stator, irdAnd irqIs the dq component of the rotor current, krdiAdjusting the integral coefficient, k, for rotor activityrdpFor active regulation of the proportionality coefficient, k, of the rotorrqiFor reactive regulation of the integral coefficient, k, of the rotorrqpA rotor reactive power regulation proportionality coefficient is obtained, and s is a Laplace operator;
when the active power output and the reactive power output of the flywheel energy storage unit are distributed, as shown in fig. 4, the expression of the side current control loop of the frequency converter is shown as
upd＝(kpd+kid/s)(PFref/Up-ipd)
upq＝(kpq+kiq/s)(QFref/Up-ipq)
Motor SVPWMThe generator controls the rotor-side converter according to the current control loop output. Wherein, UpFor the amplitude of the voltage at the output of the machine, ipq，ipdOutputting dq component, k, obtained after three-phase current is changed by 3s/2r for motorpdFor active adjustment of the ratio coefficient, kpqFor reactive adjustment of the proportionality coefficient, kidFor active adjustment of the integral coefficient, kiqAnd s is a Laplace operator for a reactive power regulation integral coefficient.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (5)

1. A frequency and voltage regulation control system of a voltage source type wind turbine generator is characterized in that: including wind turbine generator system and flywheel energy storage unit, flywheel energy storage unit is including consecutive flywheel, motor and motor converter, and wind turbine generator system stator side links to each other with motor converter electricity, and flywheel energy storage unit links to each other with wind turbine generator system electric wire netting side converter electricity, the wind turbine generator system rotor loops through rotor side converter and electric wire netting side converter and electric continuous with the electric wire netting, rotor side converter control end links to each other with rotor side SVPWM generator output, and rotor side SVPWM generator input links to each other with current control ring and voltage control ring in proper order, motor converter control end links to each other with motor SVPWM generator output, and motor SVPWM generator input links to each other with motor converter current control ring, and wind turbine generator system machine side converter is used for controlling wind turbine generator system stator side power output, and the power output control decoupling zero of flywheel energy storage unit.
2. A frequency and voltage regulation control method for a voltage source type wind turbine generator system adopts the system of claim 1, and is characterized in that: the method comprises the following steps:
s1, initializing the controller;
s2, calculating a correlation coefficient;
the correlation coefficient comprises an active fluctuation coefficient of the wind turbine generator and an active fluctuation coefficient of the flywheel energy storage unit;
the active fluctuation coefficient expressions of the wind turbine generator and the flywheel energy storage unit are as follows:
Figure FDA0003525536560000011
Figure FDA0003525536560000012
wherein S iswAnd SFRespectively are active power fluctuation coefficients of a voltage source type wind turbine generator set and a flywheel energy storage unit, wherein
Figure FDA0003525536560000021
Shows the influence on the grid-connected point frequency when the active power output of the voltage source type wind turbine generator changes,
Figure FDA0003525536560000022
representing the influence on the grid-connected point frequency when the active output of the flywheel energy storage unit changes;
s3, calculating reactive power setting and active power setting required by the wind turbine generator during grid connection;
the step S3 includes:
s31, detecting whether the wind turbine generator is connected to the grid, if so, entering the step S32; if not, ending;
s32, measuring the voltage and current of the grid-connected point, and calculating the frequency and voltage deviation of the grid-connected point;
s33, calculating the required active power setting
Pwref＝P′wref+SwΔP
PFref＝P′Fref+SFΔP
Wherein, PwrefIs the active power given of the wind turbine'wrefIs a preset value, PFrefIs an active power given, P 'of the flywheel energy storage unit'FrefThe initial value of (2) is a preset value;
s34, calculating the total reactive power given
ΔQGeneral assembly＝(ΔU-SPU(ΔPw+ΔPF))/SQU
Wherein, the delta U is the voltage deviation of the grid connection point;
s35, determining the reactive power setting of the wind turbine generator and the reactive power setting of the flywheel energy storage system;
s351: given Q for judging reactive power of wind turbine generatorwrefGiven Δ Q with total reactive powerGeneral assemblyWhether the sum is greater than the maximum output reactive power Q of the wind turbine generatorwmaxIf yes, go to step S352; if not, giving the reactive power of the wind turbine generator
Qwref＝Q′wref+ΔQGeneral assembly
Wherein
Figure FDA0003525536560000031
PF is the power factor, P, given by the wind turbinewOutputting actual active power, Q 'for wind turbine generator set'wrefThe initial value of (2) is a preset value;
s352: make wind turbine generator system idle given Qwref＝Qwmax；
S353: judging idle given Q of flywheel energy storage systemFrefSetting idle given delta Q with flywheel energy storage systemFWhether the sum is greater than the maximum output reactive power Q of the flywheel energy storage unitFmaxIf yes, then QFref＝QFmax(ii) a If not, QFref＝Q′Fref+QFmax(ii) a Wherein
Figure FDA0003525536560000032
SFIs the rated capacity of the motor, PFInstantaneous active, Q 'output by the motor'FrefThe initial value of (2) is a preset value;
s36, returning to the step S31;
s4, distributing active power output and reactive power output to the wind turbine generator and the flywheel energy storage unit;
the step S4 includes:
s401, obtaining a stator coordinate transformation angle
θ0＝∫(ωgrid-kw(Pwref-Pw))
Wherein, ω isgridGrid frequency, k, for phase-locked loop outputwThe frequency-active droop coefficient of the wind turbine generator is shown as the frequency-active droop coefficient;
s402, obtaining active power P of the statorsAnd reactive power Qs
Figure FDA0003525536560000033
Wherein isabc，usabcStator current and stator voltage abc components, u, respectivelysd，usqRespectively stator voltage dq component, isd，isqRespectively stator current dq components;
s403: let Pw＝Ps，Qw＝Qs，PwReturning to step S401 while according to QwCalculating a stator voltage reference value Vsref
Vsref＝Vb-kq(Qwref-Qw)
Wherein, Vb1 is the rated voltage amplitude of the power grid, kqThe voltage-reactive droop coefficient is the wind generating set voltage-reactive droop coefficient;
s404: the expression of the obtained voltage control loop is as follows:
Figure FDA0003525536560000041
Figure FDA0003525536560000042
the expression for the current control loop is:
Figure FDA0003525536560000043
Figure FDA0003525536560000044
wherein, VsdAnd VsqIs the dq component of the stator voltage, ksdiAdjusting the integral coefficient, k, for stator activitysdpFor active regulation of the stator proportionality coefficient, ksqiReactive regulation of the integral coefficient, k, for the statorsqpFor reactive regulation of the proportionality coefficient of the stator, irdAnd irqIs the dq component of the rotor current, krdiAdjusting the integral coefficient, k, for rotor activityrdpFor active regulation of the proportionality coefficient, k, of the rotorrqiFor reactive regulation of the integral coefficient, k, of the rotorrqpAnd s is a Laplace operator for the rotor reactive power regulation proportionality coefficient.
3. The frequency and voltage regulation control method of the voltage source type wind turbine generator set according to claim 2, characterized in that: in step S2, the correlation coefficient further includes a voltage sensitivity coefficient, and the voltage sensitivity coefficient includes SPθ、SQθ、SPUAnd SQUVoltage sensitivity matrix of
Figure FDA0003525536560000051
Figure FDA0003525536560000052
Wherein,
Figure FDA0003525536560000053
ΔPF＝SFΔP-PFof wind-power units and flywheel energy-storage units of voltage source typeActive power change, PwAnd PFRespectively represents the actual active power of the voltage source type wind turbine generator set and the flywheel energy storage unit,
Figure FDA0003525536560000054
the active power setting of the voltage source type wind turbine generator set is shown, delta P is the deviation of the total active power output of the voltage source type wind turbine generator set and the flywheel energy storage unit at the moment and the last moment, theta and U are the phase angle and the amplitude of the voltage of a grid connection point, and delta QwAnd Δ QFRespectively, the reactive power change of the voltage source type wind turbine generator set and the flywheel energy storage unit, SPθ、SQθ、SPUAnd SQUThe letters in the subscript represent the physical quantity of the sensitivity association, P represents the active power, and Q represents the reactive power.
4. The frequency and voltage regulation control method of the voltage source type wind turbine generator set according to claim 2, characterized in that: in the step S35, when determining that the wind turbine generator and the flywheel energy storage system are idle, the step S352 further includes the following steps:
and calculating the reactive power setting of the flywheel energy storage system
ΔQF＝Qwref+ΔQGeneral assembly-Qwmax。
5. The frequency and voltage regulation control method of the voltage source type wind turbine generator set according to claim 2, characterized in that: when the active power output and the reactive power output of the flywheel energy storage unit are distributed in the step S4, the expression of the side current control loop of the frequency converter is
upd＝(kpd+kid/s)(PFref/Up-ipd)
upq＝(kpq+kiq/s)(QFref/Up-ipq)
Wherein, UpFor the amplitude of the voltage at the output of the machine, ipq，ipdOutputting dq component, k, obtained after three-phase current is changed by 3s/2r for motorpdFor active adjustment of the ratio coefficient, kpqFor reactive adjustment of the proportionality coefficient, kidFor active adjustment of the integral coefficient, kiqAnd s is a Laplace operator for a reactive power regulation integral coefficient.
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