CN108270238B - Virtual synchronous generator control method based on dynamic virtual resistance - Google Patents
Virtual synchronous generator control method based on dynamic virtual resistance Download PDFInfo
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- CN108270238B CN108270238B CN201810083940.XA CN201810083940A CN108270238B CN 108270238 B CN108270238 B CN 108270238B CN 201810083940 A CN201810083940 A CN 201810083940A CN 108270238 B CN108270238 B CN 108270238B
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/38—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
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses the virtual synchronous generator control methods based on dynamic virtual resistance.The present invention designs virtual resistance in two-phase rotating coordinate system, it is the synchronous resistance of the dynamic virtual with high-pass filter form by traditional stable state virtual synchronous resistive arrangement, small resistance is shown as in low-frequency range using the synchronous resistance of dynamic virtual to not influence the steady-state performance of virtual synchronous generator, the resistance of certain value is shown as at resonance point, to reduce the degree of coupling of virtual synchronous generator active power of output and reactive power in dynamic process, it is suppressed that the oscillation in virtual synchronous generator dynamic process.
Description
Technical field
The present invention relates to distributed power generation and power electronics fields, are based particularly on the virtual same of dynamic virtual resistance
Walk generator control method.
Background technique
With the increase of new-energy grid-connected, electric system inertia, damping are reduced, bad stability.Virtual synchronous generator
(virtual synchronous generators, VSG) technology runs external characteristics by simulation synchronous generator, improves and is
The inertia of system becomes one of the effective scheme for solving the problems, such as distributed generation resource high permeability.It is virtually hindered in virtual synchronous generator
The output impedance that anti-control technology can configure virtual synchronous generator is widely used in the power decoupled control of virtual synchronous generator
In system, pass through negative virtual resistance, it is possible to reduce degree of coupling of the power in stable state.However it is existing research shows that the void being positive
Quasi- resistance can provide damping for system, inhibit the oscillation of virtual synchronous generator system, dynamically couple journey between reduction power
Degree.Existing virtual impedance technology can not accomplish the oscillation of inhibition synchronous generator system simultaneously, reduce power dynamic process
Degree of coupling and degree of coupling when not influencing power steady-state.
Entitled " the power Dynamic Coupling mechanism and synchronizing frequency resonance of virtual synchronous generator inhibit strategy ", " China's electricity
Machine engineering journal ", the 16th phase article of page 381~390 in 2017.This article proposes a kind of automatic virtual blocks synchronous generator control
Strategy.Virtual impedance is designed as positive resistance, can inhibit the oscillation in virtual synchronous generator dynamic process, is reduced between power
Degree of coupling in dynamic process, however degree of coupling when positive virtual resistance will increase power metastable state.
102623992 A of Chinese invention patent application prospectus CN is disclosed on 08 01st, 2012 " based on rotation
Turn the control of isolated island micro-capacitance sensor and the optimization method of coordinate virtual impedance " although and the virtual resistance of design in two-phase rotating coordinate system
It is anti-, but the virtual impedance of its design is constant, different virtual impedance values can not be shown in different frequency range, thus cannot be flexible
The dynamic process of virtual synchronous generator system is transformed.
A kind of 105429170 A of Chinese invention patent application prospectus CN " base disclosed on 03 23rd, 2016
In the microgrid inverter droop control method of adjustable virtual impedance " although degree of coupling of the power in stable state when can be reduced,
It is the degree of coupling that can not reduce power in dynamic process, and designed virtual impedance also can not be virtual synchronous generator
System provides damping.
In summary document, there are deficiencies below for existing virtual impedance technology:
1) oscillation for inhibiting virtual synchronous generator system can not be combined, the degree of coupling of power dynamic process is reduced
And degree of coupling when not influencing power steady-state.
2) virtual impedance is set form stable by most of virtual impedance technology, not flexible using virtual impedance technology
The dynamic property of ground transformation virtual synchronous generator.
Summary of the invention
The technical problem to be solved in the present invention is that cannot be considered in terms of inhibition virtual synchronous for existing virtual impedance control method
The oscillation of generator system, degree of coupling when reducing the degree of coupling of power dynamic process and not influencing power steady-state is not
Foot, the virtual impedance control method for the degree of coupling that provides one kind when damping and power steady-state can be provided for system.
To solve technical problem of the invention, used technical solution are as follows: the virtual synchronous based on dynamic virtual resistance
Generator control method, steps are as follows:
The three-phase output electric current i of step 1, the virtual synchronous generator of samplinga,ib,ic, the three-phase of virtual synchronous generator is defeated
Voltage U outa,Ub,Uc, flow through the electric current i of filter inductanceLa,iLb,iLc, and calculate the active power of virtual synchronous generator output
PeAnd reactive power Qe, the active-power P of the virtual synchronous generator outputeAnd reactive power QeCalculating formula be respectively as follows:
Wherein, TfFor the time constant of low-pass first order filter, s is Laplace operator；
Step 2, the reference value P for setting active powerref, the reference value Q of reactive powerref；
Step 3, according to virtual synchronous generator control algorithm, virtual synchronous generator built-in potential amplitude E is calculated, it is interior
Potential phase theta, the virtual synchronous generator built-in potential amplitude E, the calculating formula of built-in potential phase theta are respectively as follows:
E=Uref+(Qref-Qe)n；
Wherein, UrefFor the reference value of output line voltage, n is the sagging coefficient of reactive power, ωmFor virtual synchronous power generation
The angular frequency of machine output,In formula, m is the sagging coefficient of active power；J is virtual same
Walk the rotary inertia of generator；D is the damped coefficient of virtual synchronous generator；ωrefFor the reference value of angular frequency；
The three-phase that step 1 sampling obtains virtual synchronous generator is exported electric current i by step 4a,ib,ic, virtual synchronous power generation
The three-phase output voltage U of machinea,Ub,Uc, flow through the electric current i of filter inductanceLa,iLb,iLc, in the built-in potential phase theta that step 3 obtains
Under do the conversion of three phase static rotating coordinate system to two-phase rotating coordinate system, obtain under two-phase rotating coordinate system virtual synchronous hair
The output electric current i of motord,iq, the output voltage U of virtual synchronous generatord,Uq, flow through the electric current i of filter inductanceLd,iLq；
The three-phase exports electric current ia,ib,icTransfer equation from three phase static rotating coordinate system to two-phase rotating coordinate system
Are as follows:
The three-phase output voltage Ua,Ub,UcTransfer equation from three phase static rotating coordinate system to two-phase rotating coordinate system
Are as follows:
The electric current i for flowing through filter inductanceLa,iLb,iLcFrom three phase static rotating coordinate system to two-phase rotating coordinate system
Transfer equation are as follows:
Dynamic virtual resistance R is added in step 5dv, obtain the pressure drop U in dynamic virtual impedancevd,Uvq, dynamic virtual resistance
RdvFor the form of high-pass filter, the dynamic virtual resistance Rdv, pressure drop U in dynamic virtual impedancevd,UvqExpression formula are as follows:
Wherein A is the amplification coefficient of high-pass filter, ωcFor the cutoff frequency of high-pass filter；
The dynamic virtual that step 6, the built-in potential amplitude E of the virtual synchronous generator obtained according to step 3 and step 5 obtain
Pressure drop U in impedancevd,Uvq, the d axis instruction value U of virtual synchronous generator output voltage is calculateddrefWith q axis instruction value
Uqref, the d axis instruction value U of the virtual synchronous generator output voltagedrefWith q axis instruction value UqrefCalculating formula be respectively as follows:
Step 7, the d axis instruction value U by output voltage obtained in step 6drefWith output voltage obtained in step 4
D axis component Ud, by d shaft voltage closed-loop control equation, obtain filter inductance electric current d axis instruction value iLdref；It will be obtained in step 6
Output voltage q axis instruction value UqrefWith the q axis component U of output voltage obtained in step 4q, by q shaft voltage closed loop control
Equation processed obtains filter inductance electric current q axis instruction value iLqref, the d shaft voltage closed-loop control equation and q shaft voltage closed-loop control
The expression formula of equation is respectively as follows:
Wherein, kvpFor voltage close loop proportional controller coefficient, kviVoltage close loop integral controller coefficient；
Step 8, by filter inductance electric current d axis instruction value i obtained in step 7LdrefWith filter inductance obtained in step 4
Electric current d axis component iLd, by d shaft current closed-loop control equation, obtain d axis output signal Uidi；It will be filtered obtained in step 7
Inductive current q axis instruction value iLqrefWith filter inductance electric current q axis component i obtained in step 4Lq, by q shaft current closed loop control
Equation processed obtains q axis output signal Uiqi, the expression of the d shaft current closed-loop control equation and q shaft current closed-loop control equation
Formula is respectively as follows:
Wherein kipFor current closed-loop proportional controller coefficient；
Step 9, by the output signal U under dq coordinate system obtained in step 8idiAnd UiqiIn the built-in potential that step 3 obtains
The conversion of two-phase rotating coordinate system to three phase static rotating coordinate system is done under phase theta, obtains the three-phase tune of inverter leg voltage
Wave U processedmai,Umbi,Umci, and the driving signal after PWM modulation as IGBT circuit, the two-phase rotating coordinate system to three-phase
The transfer equation of static rotating coordinate system are as follows:
The virtual synchronous generator control method of dynamic virtual resistance disclosed by the invention, with existing virtual impedance controlling party
Method is compared, and its advantages are embodied in:
1 taken into account for system provide damping inhibit virtual synchronous generator system oscillation and reduce in power dynamic process
Degree of coupling, and degree of coupling when not influencing the stable state of power.
2 implementation methods are simple, efficiently.
3, which solve the problems, such as that existing virtual impedance strategy not can be implemented simultaneously, provides damping and power decoupled for system.
Detailed description of the invention
Fig. 1 is the virtual synchronous generator connecting in parallel with system structure chart in the embodiment of the present invention.
Fig. 2 is the overall control block diagram of control method of the present invention.
When Fig. 3 is no dynamic virtual resistance, generator rotor angle increase 0.01rad when, virtual synchronous generator active power of output and
The dynamic response of reactive power.
Fig. 4 is when having dynamic virtual resistance, when generator rotor angle increases 0.01rad, virtual synchronous generator active power of output and
The dynamic response of reactive power.
When Fig. 5 is no dynamic virtual resistance, when active power reference value increases 10kW, the output of virtual synchronous generator is active
The dynamic response of power.
Fig. 6 is when having dynamic virtual resistance, and when active power reference value increases 10kW, the output of virtual synchronous generator is active
The dynamic response of power.
Specific embodiment
The present invention is further described with example with reference to the accompanying drawing.
Fig. 1 is the virtual synchronous generator connecting in parallel with system structure chart in the embodiment of the present invention.DC source as shown in the drawing passes through inverse
Become device inversion as AC energy, it is 50Hz that the amplitude of inverter rated output line voltage, which is 380V frequency,.AC energy is through filtering
Point of common coupling (PCC) is accessed by line impedance after wave inductance and filter capacitor filtering.Design parameter is as follows: DC source Udc=
600V, bridge arm side filter inductance Lf=0.06mH, filter capacitor Cf=300uF, line resistance Rg=0.1 Ω, line inductance are
Lg=1mH.
Fig. 2 is the overall control block diagram of control method of the present invention.It may be seen that the step of control method of the present invention, is such as
Under:
The three-phase output electric current i of step 1, the virtual synchronous generator of samplinga,ib,ic, the three-phase of virtual synchronous generator is defeated
Voltage U outa,Ub,Uc, flow through the electric current i of filter inductanceLa,iLb,iLc, and calculate the active power of virtual synchronous generator output
PeAnd reactive power Qe, the active-power P of the virtual synchronous generator outputeAnd reactive power QeCalculating formula be respectively as follows:
Wherein, TfFor the time constant of low-pass first order filter, s is Laplace operator.T is taken in this examplef=1 × 10-4s。
Step 2, the reference value P for setting active powerref, the reference value Q of reactive powerref, P is set in this exampleref=
50kW, Qref=0var.
Step 3, according to virtual synchronous generator control algorithm, virtual synchronous generator built-in potential amplitude E is calculated, it is interior
Potential phase theta, the virtual synchronous generator built-in potential amplitude E, the calculating formula of built-in potential phase theta are respectively as follows:
E=Uref+(Qref-Qe)n
Wherein, UrefFor the reference value of output line voltage, n is the sagging coefficient of reactive power, ωmFor virtual synchronous power generation
The angular frequency of machine output,In formula, m is the sagging coefficient of active power；J is virtual same
Walk the rotary inertia of generator；D is the damped coefficient of virtual synchronous generator；ωrefFor the reference value of angular frequency.The present embodiment
In, Uref=539V, m=1 × 10-4, n=1 × 10-4, J=20kgm2；D=20；ωref=314rad/s.
The output electric current i of step 4, the virtual synchronous generator for obtaining step 1 samplinga,ib,ic, virtual synchronous power generation
The output voltage U of machinea,Ub,Uc, flow through the electric current i of filter inductanceLa,iLb,iLc, done under the built-in potential phase theta that step 3 obtains
Three-phase static coordinate system obtains the virtual synchronous generator output under two-phase rotating coordinate system to the conversion of two-phase rotating coordinate system
Electric current id,iq；The output voltage U of virtual synchronous generatord,Uq, flow through the electric current i of filter inductanceLd,iLq。
The three-phase exports electric current ia,ib,icTransfer equation from three phase static rotating coordinate system to two-phase rotating coordinate system
Are as follows:
The three-phase output voltage Ua,Ub,UcTransfer equation from three phase static rotating coordinate system to two-phase rotating coordinate system
Are as follows:
The electric current i for flowing through filter inductanceLa,iLb,iLcFrom three phase static rotating coordinate system to two-phase rotating coordinate system
Transfer equation are as follows:
Dynamic virtual resistance R is added in step 5dv, obtain the pressure drop U in dynamic virtual impedancevd,Uvq, dynamic virtual resistance
RdvFor the form of high-pass filter, the dynamic virtual resistance Rdv, pressure drop U in dynamic virtual impedancevd,UvqExpression formula are as follows:
Wherein A is the amplification coefficient of high-pass filter, ωcFor the cutoff frequency of high-pass filter, in this example, A=
0.3, ωc=80rad/s.
Step 6, the dynamic virtual that the built-in potential amplitude E and step 5 of the virtual synchronous generator obtained according to step 3 are obtained
Pressure drop U in impedancevd,Uvq, the d axis instruction value U of virtual synchronous generator output voltage is calculateddrefWith q axis instruction value
Uqref, the d axis instruction value U of the virtual synchronous generator output voltagedrefWith q axis instruction value UqrefCalculating formula be respectively as follows:
Step 7, the d axis instruction value U by output voltage obtained in step 6drefWith output voltage obtained in step 4
D axis component Ud, by d shaft voltage closed-loop control equation, obtain filter inductance electric current d axis instruction value iLdref；It will be obtained in step 6
Output voltage q axis instruction value UqrefWith the q axis component U of output voltage obtained in step 4q, by q shaft voltage closed loop control
Equation processed obtains filter inductance electric current q axis instruction value iLqref, the d shaft voltage closed-loop control equation and q shaft voltage closed-loop control
The expression formula of equation is respectively as follows:
Wherein, kvpFor voltage close loop proportional controller coefficient, kviVoltage close loop integral controller coefficient.In this example, take
kvi=1200.
Step 8, by filter inductance electric current d axis instruction value i obtained in step 7LdrefWith filter inductance obtained in step 4
Electric current d axis component iLd, by d shaft current closed-loop control equation, obtain d axis output signal Uidi；It will be filtered obtained in step 7
Inductive current q axis instruction value iLqrefWith filter inductance electric current q axis component i obtained in step 4Lq, by q shaft current closed loop control
Equation processed obtains q axis output signal Uiqi, the expression of the d shaft current closed-loop control equation and q shaft current closed-loop control equation
Formula is respectively as follows:
Wherein kipFor current closed-loop proportional controller coefficient.K is taken in this exampleip=40.
Step 9, by the output signal U under dq coordinate system obtained in step 8idiAnd UiqiIn the built-in potential that step 3 obtains
The conversion of two-phase rotating coordinate system to three phase static rotating coordinate system is done under phase theta, obtains the three-phase tune of inverter leg voltage
Wave U processedmai,Umbi,Umci, and the driving signal after PWM modulation as IGBT circuit.
Transfer equation of the two-phase rotating coordinate system to three phase static rotating coordinate system are as follows:
When Fig. 3 is no dynamic virtual resistance, generator rotor angle increases 0.01rad, virtual synchronous generator active power of output and nothing
The dynamic response of function power.It can be produced in power dynamic process serious since line circuit is compared with mini system underdamping
Degree of coupling, but degree of coupling when power steady-state is smaller.
Fig. 4 is when having dynamic virtual resistance, and generator rotor angle increases 0.01rad, virtual synchronous generator active power of output and nothing
The dynamic response of function power.Due to the addition of dynamic virtual resistance, degree of coupling is effectively suppressed in power dynamic process.And
And degree of coupling when power steady-state, as when no dynamic virtual resistance, there is no increase.
When Fig. 5 is no dynamic virtual resistance, when active power reference value increases 10kW, the output of virtual synchronous generator is active
The dynamic response of power.It can be seen that active power dynamic process occurs serious since line circuit is compared with mini system underdamping
Oscillation.
Fig. 6 is when having dynamic virtual resistance, and when active power reference value increases 10kW, the output of virtual synchronous generator is active
The dynamic response of power.It can be seen that the damping of system is increased due to joined dynamic virtual resistance, active power dynamic process
Oscillation is suppressed.
Claims (1)
1. a kind of virtual synchronous generator control method based on dynamic virtual resistance, which is characterized in that steps are as follows:
The three-phase output electric current i of step 1, the virtual synchronous generator of samplinga,ib,ic, the three-phase of virtual synchronous generator exports electric
Press Ua,Ub,Uc, flow through the electric current i of filter inductanceLa,iLb,iLc, and calculate the active-power P of virtual synchronous generator outputeWith
Reactive power Qe, the active-power P of the virtual synchronous generator outputeAnd reactive power QeCalculating formula be respectively as follows:
Wherein, TfFor the time constant of low-pass first order filter, s is Laplace operator；
Step 2, the reference value P for setting active powerref, the reference value Q of reactive powerref；
Step 3, according to virtual synchronous generator control algorithm, virtual synchronous generator built-in potential amplitude E, built-in potential is calculated
Phase theta, the virtual synchronous generator built-in potential amplitude E, the calculating formula of built-in potential phase theta are respectively as follows:
E=Uref+(Qref-Qe)n；
Wherein, UrefFor the reference value of output line voltage, n is the sagging coefficient of reactive power, ωmFor the output of virtual synchronous generator
Angular frequency,In formula, m is the sagging coefficient of active power；J is virtual synchronous hair
The rotary inertia of motor；D is the damped coefficient of virtual synchronous generator；ωrefFor the reference value of angular frequency；
The three-phase that step 1 sampling obtains virtual synchronous generator is exported electric current i by step 4a,ib,ic, virtual synchronous generator
Three-phase output voltage Ua,Ub,Uc, flow through the electric current i of filter inductanceLa,iLb,iLc, done under the built-in potential phase theta that step 3 obtains
Three phase static rotating coordinate system obtains the virtual synchronous generator under two-phase rotating coordinate system to the conversion of two-phase rotating coordinate system
Output electric current id,iq, the output voltage U of virtual synchronous generatord,Uq, flow through the electric current i of filter inductanceLd,iLq；
The three-phase exports electric current ia,ib,icTransfer equation from three phase static rotating coordinate system to two-phase rotating coordinate system are as follows:
The three-phase output voltage Ua,Ub,UcTransfer equation from three phase static rotating coordinate system to two-phase rotating coordinate system are as follows:
The electric current i for flowing through filter inductanceLa,iLb,iLcConversion from three phase static rotating coordinate system to two-phase rotating coordinate system
Equation are as follows:
Dynamic virtual resistance R is added in step 5dv, obtain the pressure drop U in dynamic virtual impedancevd,Uvq, dynamic virtual resistance RdvFor
The form of high-pass filter, the dynamic virtual resistance Rdv, pressure drop U in dynamic virtual impedancevd,UvqExpression formula are as follows:
Wherein A is the amplification coefficient of high-pass filter, ωcFor the cutoff frequency of high-pass filter；
The dynamic virtual impedance that step 6, the built-in potential amplitude E of the virtual synchronous generator obtained according to step 3 and step 5 obtain
On pressure drop Uvd,Uvq, the d axis instruction value U of virtual synchronous generator output voltage is calculateddrefWith q axis instruction value Uqref, institute
State the d axis instruction value U of virtual synchronous generator output voltagedrefWith q axis instruction value UqrefCalculating formula be respectively as follows:
Step 7, the d axis instruction value U by output voltage obtained in step 6drefWith the d axis point of output voltage obtained in step 4
Measure Ud, by d shaft voltage closed-loop control equation, obtain filter inductance electric current d axis instruction value iLdref；It will be defeated obtained in step 6
The q axis instruction value U of voltage outqrefWith the q axis component U of output voltage obtained in step 4q, by q shaft voltage closed-loop control side
Journey obtains filter inductance electric current q axis instruction value iLqref, the d shaft voltage closed-loop control equation and q shaft voltage closed-loop control equation
Expression formula be respectively as follows:
Wherein, kvpFor voltage close loop proportional controller coefficient, kviVoltage close loop integral controller coefficient；
Step 8, by filter inductance electric current d axis instruction value i obtained in step 7LdrefWith filter inductance electric current obtained in step 4
D axis component iLd, by d shaft current closed-loop control equation, obtain d axis output signal Uidi；By filter inductance obtained in step 7
Electric current q axis instruction value iLqrefWith filter inductance electric current q axis component i obtained in step 4Lq, by q shaft current closed-loop control side
Journey obtains q axis output signal Uiqi, the expression formula point of the d shaft current closed-loop control equation and q shaft current closed-loop control equation
Not are as follows:
Wherein kipFor current closed-loop proportional controller coefficient；
Step 9, by the output signal U under dq coordinate system obtained in step 8idiAnd UiqiIn the built-in potential phase theta that step 3 obtains
Under do the conversion of two-phase rotating coordinate system to three phase static rotating coordinate system, obtain the three-phase modulations wave of inverter leg voltage
Umai,Umbi,Umci, and the driving signal after PWM modulation as IGBT circuit, the two-phase rotating coordinate system to three phase static
The transfer equation of rotating coordinate system are as follows:
Umai=Uidicosθ+Uiqisinθ
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| CN109066782B (en) * | 2018-08-22 | 2021-05-04 | 合肥工业大学 | Control method of virtual synchronous generator containing dynamic damping without phase-locked loop |
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| CN109950912B (en) * | 2019-04-03 | 2020-09-01 | 合肥工业大学 | Virtual synchronous generator control method with dynamic flux linkage characteristic simulation |
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| CN111030139B (en) * | 2019-12-18 | 2022-10-04 | 合肥工业大学 | Series compensation power grid resonance suppression method based on virtual synchronous generator |
| CN111697585B (en) * | 2020-06-17 | 2021-08-10 | 合肥工业大学 | Method for setting virtual resistance value boundary of parallel impedance adapter |
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