CN107681662B - Virtual synchronous generator control method with electric energy quality composite control function - Google Patents
Virtual synchronous generator control method with electric energy quality composite control function Download PDFInfo
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The virtual synchronous generator control method with the power quality composite control function comprises the steps of SOGI-PLL phase locking and three-phase voltage positive sequence component decomposition, virtual synchronous generator power outer loop control, virtual impedance control, FBD harmonic detection based on an SGT filter, current inner loop control based on a multi-quasi-PR controller and 3D-SVPWM modulation generation of four-leg circuit driving signals. The power outer loop control of the virtual synchronous generator enables the control strategy to output fundamental wave power to simulate the output characteristics of the synchronous generator; virtual impedance control is adopted, so that the output impedance of the inverter is increased; the detection and compensation of harmonic current, unbalanced current and reactive current can be rapidly and accurately finished by FBD harmonic detection based on an SGT filter and current inner loop control based on a multiple quasi-PR controller; and 3D-SVPWM modulation is carried out to generate a three-phase four-leg inverter driving signal. The invention has multiple functions while simulating the output characteristic of the synchronous generator, expands the functions of the virtual synchronous machine and enriches the application scenes of the virtual synchronous machine.
Description
Technical Field
The invention relates to the technical field of multifunctional inverter control, in particular to a virtual synchronous generator control method with a function of combining virtual synchronous generator control with harmonic compensation, unbalanced current compensation and reactive compensation, and particularly relates to a virtual synchronous generator control method with a power quality composite control function.
Background
Most distributed energy sources need to be connected to the grid through power electronic converters. When the installed capacity of the new energy is low, because the traditional generator can provide support for the stability of the system, the control mode can not bring great harm to the stability of the system. However, as more and more new energy sources are accessed into the grid, conventional generators are not sufficient to continue to maintain stable operation of the power system. Furthermore, distributed power generation systems interfaced with power electronic converters lack the inertia and damping that conventional motors have, and thus power systems are more susceptible to power fluctuations and system faults.
The distributed power generation system under the control of the virtual synchronous generator can simulate the characteristic that a traditional synchronous machine provides inertia and damping for a power system, actively participates in voltage regulation and frequency modulation of a power grid, and improves the stability of the power system to a certain extent. At present, most of virtual synchronous generators provide inertia and damping support for a power grid only by controlling dynamic output of active power and reactive power, participate in voltage regulation and frequency modulation of the power grid, have fixed functions, and fail to fully exert the characteristic of flexible control of power electronic equipment.
At present, the virtual synchronous generator is mainly applied to an active power distribution network. Usually, in order to ensure the quality of electric energy in an Active Power distribution network, an Active Power Filter (APF) needs to be added to compensate harmonic waves, imbalance and even reactive current generated by nonlinear loads in the Power distribution network. The active power filter also takes power electronic equipment as a grid-connected interface, so that the virtual synchronous generator can be considered to be combined with the power quality control function, and the investment of the active power filter is reduced.
Disclosure of Invention
In order to solve the existing problems, the invention provides a virtual synchronous generator control method with an electric energy quality composite control function, the control strategy is established on the basis of a three-phase four-bridge arm inverter circuit structure, the control strategy simulates the output characteristic of a synchronous generator and has the functions of harmonic current, unbalanced current and reactive compensation under the condition of a non-ideal power grid, the functions of the virtual synchronous generator are expanded, the application scenes of the virtual synchronous generator are enriched, and in order to achieve the aim, the invention provides the virtual synchronous generator control method with the electric energy quality composite control function, the control method is performed on the basis of the three-phase four-bridge arm inverter circuit structure, the method comprises the following steps:
1) the SOGI-PLL phase locking and three-phase voltage positive sequence component decomposition;
2) virtual synchronous generator power outer loop control;
3) virtual impedance control;
4) FBD harmonic current, unbalanced current and reactive current detection based on the SGT filter;
5) current inner loop control based on a multiple quasi-PR controller;
6) and 3D-SVPWM modulation is carried out to generate a four-bridge arm circuit driving signal.
As a further aspect of the invention, step 1) comprises applying a voltage to the power supply system, i.e. the filter capacitor voltage uCabc＝[uCa,uCb,uCc]TPerforming SOGI-PLL operation to obtain its phase theta and frequency omegagAnd amplitude Ug(ii) a Reuse uCabcInstantaneous value and theta to uCabcPerforming positive order decomposition to obtain uCabcPositive sequence component u ofCabc +＝[uCa +,uCb +,uCb +]T。
As a further aspect of the present invention, step 2) includes calculating an average value of twice the power frequency of the output instantaneous power of the virtual synchronous generator, an active-power angle ring of the virtual synchronous generator, and a reactive-voltage ring of the virtual synchronous generator, and the step generates a virtual internal potential instantaneous value e of the virtual synchronous generator in dq0 coordinate systemdq0＝[ed,eq,e0]T。
As a further development of the invention, said step 3) uses the virtual internal potential instantaneous value e generated in step 2)dq0And the grid voltage phase theta is converted by iPark to generate a reference value e of the virtual internal potential under an alpha beta gamma coordinate systemαβγ *＝[eα *,eβ *,eγ *]T(ii) a For the positive sequence component u of the capacitor voltage under the abc coordinate systemCabc +Clarke transformation is carried out, and the transformed u is converted into a coordinate system of alpha, beta and gammaCαβγ＝[uCα,uCβ,uCγ]T；eαβγ *And uCαβγAfter comparison, the fundamental power reference current i is obtained through virtual impedance controlαβγ *＝[iα *,iβ *,iγ *]T。
As a further aspect of the invention, the virtual impedance comprises a virtual resistance RvAnd a virtual reactance LvThe virtual impedance physical meaning is related to the stator resistance and the synchronous electricity of the synchronous generatorAll feeling are the same, and set omeganLv＞＞RvThe virtual impedance of the present invention includes a virtual resistor RvAnd a virtual reactance LvThe physical meaning of the synchronous generator is completely the same as that of stator resistance and synchronous inductance of the synchronous generator. Setting omeganLv＞＞RvThe inductance between the inverter and the power grid is increased, decoupling control of active power and reactive power of the virtual synchronous generators is facilitated, and harmonic circulation formed by parallel operation of multiple virtual synchronous generators is restrained.
As a further development of the invention, said step 4) uses the load current iload＝[iloada,iloadb,iloadc]TPositive sequence component u of capacitor voltageCabc +And a phase theta, i is detected by a method based on the FBD harmonic current, unbalanced current and reactive current of the SGT filterloadThe non-fundamental wave active current component iloadh＝[iloadha,iloadhb,iloadhc]TIs separated out and i isloadhConverting the abc coordinate system into the alpha beta gamma coordinate system to obtain the harmonic reference current iloadh *＝[iloadhα *,iloadhβ *,iloadhγ *]T。
The method has the advantages of high response speed, easy adjustment of dynamic response time, no overshoot, easy realization of a Digital Signal Processor (DSP) and the like.
As a further aspect of the invention, said step 5) refers the fundamental power to the current iαβγ *And harmonic reference current iloadh *Adding to obtain a current loop reference value, and mixing the current loop reference value with the filter inductance current i subjected to Clarke transformationLαβγ＝[iLα,iLβ,iLγ]TComparing, and compensating the fundamental wave and 5, 7, 11, 13 harmonic components of each component in the alpha beta gamma coordinate system by adopting multiple quasi-PR control to obtain the alpha beta gamma coordinateIs a voltage signal u to be modulatedmod＝[umodα,umodβ,umodγ]T。
As a further aspect of the present invention, in the step 6), the voltage signal u to be modulated in the α β γ coordinate system obtained in the step 5) is utilized by a 3D-SVPWM modulation methodmodAnd generating a three-phase four-bridge arm inverter driving signal.
The invention has the following beneficial effects:
the invention can realize the artificial accurate control of the fundamental wave active power and reactive power output by the three-phase four-bridge-arm grid-connected inverter; the control method can simulate the primary frequency modulation, primary voltage regulation and inertia characteristics of the synchronous generator, participate in power grid regulation, provide inertia and damping support and contribute to the stability of the power grid; meanwhile, the control method can effectively compensate harmonic current, unbalanced current and reactive current brought by nonlinear load, improve the quality of electric energy of the power distribution network and reduce the investment of an active power filter.
Drawings
FIG. 1 is a topological structure of a three-phase four-leg grid-connected inverter according to the present invention;
FIG. 2 is a main circuit topology structure of the three-phase four-leg grid-connected inverter of the present invention;
FIG. 3 is a diagram of the outer loop control of the virtual synchronous generator power of the present invention;
FIG. 4 is a diagram of a virtual impedance control architecture in accordance with the present invention;
FIG. 5 is a diagram of an SGT filter based FBD harmonic detection control architecture according to the present invention;
FIG. 6 is a Bode diagram of a simplified SGT filter according to the present invention;
FIG. 7 is a diagram of a control structure of the current inner loop based on the multi-quasi-PR controller according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the following detailed description and accompanying drawings:
the invention provides a virtual synchronous generator control method with a power quality composite control function, which enables a virtual synchronous generator to have harmonic wave, unbalanced current and reactive compensation functions, thereby not only expanding the functions and application scenes of the virtual synchronous generator, but also reducing the investment of power quality treatment equipment in a power distribution network.
The invention provides a main circuit topological structure of a three-phase four-bridge-arm grid-connected inverter as shown in figure 1 and figure 2, wherein Q is1～Q8Form a three-phase four-leg converter and an AC side filter inductor L1(r1Representing its parasitic resistance), a filter capacitor C1Constituting an LC type filter, LnRepresents the neutral filter inductance (r)nRepresenting its parasitic resistance), LsRepresenting the grid equivalent inductance. The DC side is reasonably controlled by a distributed power supply and stored energy through a DC/DC converter to maintain a DC voltage UdcThe voltage is stable (the control method in this aspect is mature and not described in detail), and the dc side can be regarded as a stable voltage source.
The invention needs to supply three-phase inductive current iLabc＝[iLa,iLb,iLc]TGrid side current iGabc＝[iGa,iGb,iGc]TThree-phase capacitor voltage uCabc＝[uCa,uCb,uCc]TAnd three-phase load current iload＝[iloada,iloadb,iloadc]TSampling is performed. The method comprises the following specific steps:
1. for u is pairedCabcThe instantaneous value of the a-phase voltage is subjected to SOGI-PLL operation to obtain the phase theta of the power grid voltage and the angular frequency omega of the power gridgAnd the grid voltage amplitude Ug. The control method of the SOGI-PLL is well established and fixed and will not be described in detail here. To eliminate the influence of three-phase voltage unbalance and voltage harmonicCabcAnd (3) performing positive sequence component decomposition, wherein the positive sequence component decomposition comprises the following steps:
1) will uCabcConversion from abc coordinate system to dq0 coordinate system uCdq0＝[uCd,uCq,uC0]TAs shown in the following formula:
2) for u is pairedCdq0D-axis component u ofCdAnd q-axis component uCqLow-pass filtering to obtain uCdPositive sequence component u of q0Cdq0 +＝[uCd +,uCq +,uC0 +]T(wherein uC0 +0). The low pass filtering here uses an SGT filter, which is described in detail in step 4.
3) Will uCdq0 +Converting the dq0 coordinate system into the abc coordinate system to obtain a positive sequence component uCabc +＝[uCa +,uCb +,uCc +]TAs shown in the following formula:
2. virtual synchronous generator power outer loop control. In order to simulate the primary frequency modulation function of the synchronous generator, the following active-frequency equation is established:
Pm＝Pset+Kf(ωn-ωg)
in the formula, PsetOutputting an active power set value, W, for the virtual synchronous generator; kfIs the frequency adjustment difference coefficient, W/rad; omeganThe rated angular frequency is rad/s, and the value is 100 pi when the rated frequency of a power grid is 50 Hz; pmW, which is the virtual mechanical power, corresponds to the input mechanical power of the synchronous machine.
In order to simulate the primary voltage regulation function of the synchronous generator, the following reactive-voltage equation is established:
Qm＝Qset+Kv(Un-Ug)；
in the formula, QsetOutputting a reactive power set value, Var, for the virtual synchronous generator; kvIs a voltage difference adjustment coefficient, Var/V; u shapenIs the nominal voltage amplitude, V; qmVar, the virtual synchronous generator reactive power command, corresponds to the synchronous machine reactive power command. For providing the virtual synchronous generator with reactive compensation, i.e. in Ug＝UnUnder the condition of (1), ensuring that grid-connected current does not contain reactive component and ensuring Qset＝0
In order to simulate the inertia and damping characteristics of the synchronous generator, the following inertia and damping control transfer functions are established:
where J is the virtual moment of inertia, kg/m2, which is the amount by which the virtual synchronous generator output power exhibits inertia; d is a damping coefficient, N.m.s/rad, which enables the output characteristic of the virtual synchronous generator to show a damping characteristic; is the virtual internal potential power angle, rad; peOutputting an average value of the instantaneous active power of the virtual synchronous generator in a half power frequency period, wherein W is represented by the following formula:
in the formula, TlineIs the power frequency period, s. The double power frequency average value is used for reducing the influence of pulsating quantity in the output instantaneous power of the virtual synchronous generator.
In order to realize output reactive power indifference control, a virtual synchronous generator reactive power instruction Q is setmAverage value Q of instantaneous reactive power at grid-connected point in half power frequency periodeAfter comparison, the virtual internal potential amplitude E is obtained by controlling an integration link, and a transfer function is shown as the following formula:
in the formula, K is a reactive-voltage integral coefficient; qeCan be obtained by the following formula:
the virtual synchronous generator power outer loop control architecture is shown in fig. 3. The outer loop control of the power of the virtual synchronous generator can be divided into an active angle and an active angleA loop and a reactive-voltage loop. The active-power angle loop generates a virtual internal potential power angle according to the given values of output active power and output frequency and the feedback quantity, and the reactive-voltage loop generates a virtual internal potential amplitude E according to the given values of output reactive power and output voltage amplitude and the feedback quantity. According to the power angle and the amplitude E, the instantaneous value E of the virtual internal potential under the dq0 coordinate system can be obtaineddq0＝[ed,eq,e0]T. D-axis and grid voltage u for ensuring virtual internal potentialCabcThe directions of the a-phase components of the virtual internal potential are coincident (namely, the virtual internal potential and the power grid voltage are ensured to be under the same synchronous rotation coordinate system), and the instantaneous value calculation formula of the virtual internal potential under the dq0 coordinate system is as follows:
3. and controlling virtual impedance. The virtual internal potential instantaneous value e in the dq0 coordinate systemdq0＝[ed,eq,e0]TObtained by transforming iPark into an alpha, beta and gamma coordinate system
As shown in the following formula:
the positive sequence component u of the capacitor voltage under the abc coordinate systemCabc +U is obtained by Clarke transformation to alpha beta gamma coordinate systemCαβγ＝[uCα,uCβ,uCγ]TAs shown in the following formula:
the structure of the virtual impedance control is shown in fig. 4. In the figure RvAnd LvThe virtual internal resistance and the virtual synchronous reactance are respectively, and the physical significance of the virtual internal resistance and the virtual synchronous reactance is completely the same as that of the stator resistance and the synchronous inductance of the synchronous generator. The introduction of the virtual impedance increases the output impedance of the inverter and helpsAnd inhibiting the parallel operation of multiple virtual synchronous generators to form a circulating current. By setting omeganLv＞＞RvThe inductance between the inverter and the power grid is increased, and the decoupling control of active power and reactive power is facilitated.
4. The control structure for FBD harmonic detection based on SGT filter is shown in fig. 5. This step utilizes the load current iloadInstantaneous value u of the grid voltageCabcAnd its positive sequence component uCabc +I is toloadHarmonic, unbalance and reactive component i inloadh＝[iloadha,iloadhb,iloadhc]TIs separated out and i isloadhConverting the abc coordinate system into the alpha beta gamma coordinate system to obtain the harmonic reference current iloadh *＝[iloadhα *,iloadhβ *,iloadhγ *]T。
And the general FBD harmonic detection algorithm is improved based on the FBD harmonic detection of the SGT filter. The low pass filter LPF in the conventional FBD algorithm usually employs a second order butterworth low pass filter, here implemented using a sliding Goertzel algorithm (SGT). The complete mathematical model of the SGT filter is:
wherein N is the number of sampling points in a sampling period, k is the harmonic frequency,
in general, each harmonic wave exhibits an oscillation of an integral multiple of a fundamental wave in an LPF input link in the FBD algorithm, and therefore, in the FBD algorithm, the oscillation due to the harmonic signal can be suppressed by setting k to 0 in the above expression. The above equation can be simplified as:
fig. 6 shows the Bode diagram of the simplified SGT filter. Therefore, the SGT filtering algorithm has extremely strong attenuation capacity to each harmonic component, is very suitable for being used as a low-pass filter in the FBD harmonic detection algorithm, and has the advantages of high response speed, easy adjustment of dynamic response time, no overshoot, easy DSP realization and the like.
5. The control structure diagram of the current inner loop control based on the multi-quasi-PR controller is shown in FIG. 7, and comprises the following steps: reference current i of fundamental wave powerαβγ *And harmonic reference current iloadh *Adding to obtain a current loop reference value; for filter inductance current iLabcPerforming Clarke transformation to obtain iLαβγ＝[iLα,iLβ,iLγ]T(ii) a The reference value of the current loop and the filter inductance current i after Clarke transformation are comparedLαβγComparing, and compensating the fundamental wave and the 5, 7, 11 and 13 harmonic currents by adopting a multi-quasi-PR controller to obtain a voltage signal u to be modulated under an alpha beta gamma coordinate systemmod＝[umodα,umodβ,umodγ]T. The quasi-PR controller transfer function is:
in the formula: i is the fundamental wave and the harmonic frequency to be compensated, the harmonic caused by the nonlinear load of the power system is mainly 6n +/-1 harmonic, and the harmonics of 5, 7, 11 and 13 are mainly compensated; k is a radical ofpIs a proportionality coefficient; k is a radical ofriIs the resonance coefficient; omega0For the resonant frequency, here take ω0＝ωn；ωcFor the resonance part bandwidth, taking omega considering that the frequency fluctuation of the power grid cannot exceed 1Hz frequentlyc＝2πrad/s。
6.3D-SVPWM modulation method, which utilizes the voltage signal u to be modulated under the alpha beta gamma coordinate systemmodAnd generating a three-phase four-bridge arm inverter driving signal. The 3D-SVPWM modulation method is mature and fixed, and is not described herein again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but any modifications or equivalent variations made according to the technical spirit of the present invention are within the scope of the present invention as claimed.
Claims (3)
1. The control method of the virtual synchronous generator with the power quality composite control function is carried out on the basis of a three-phase four-bridge arm inverter circuit structure, and is characterized by comprising the following steps of:
1) the SOGI-PLL phase locking and three-phase voltage positive sequence component decomposition;
to the network voltage, i.e. the filter capacitor voltage uCabc＝[uCa,uCb,uCc]TPerforming SOGI-PLL operation to obtain its phase theta and frequency omegagAnd amplitude Ug(ii) a Reuse uCabcInstantaneous value and theta to uCabcPerforming positive order decomposition to obtain uCabcPositive sequence component u ofCabc +＝[uCa +,uCb +,uCb +]T；
2) Virtual synchronous generator power outer loop control;
the method comprises the steps of calculating the average value of double power frequency of output instantaneous power of a virtual synchronous generator, calculating an active-power angle ring of the virtual synchronous generator and a reactive-voltage ring of the virtual synchronous generator, wherein the step of generating a virtual internal potential instantaneous value e of the virtual synchronous generator under a dq0 coordinate systemdq0＝[ed,eq,e0]T；
3) Virtual impedance control;
using the virtual internal potential instantaneous value e generated in step 2)dq0And the grid voltage phase theta is converted by iPark to generate a reference value e of the virtual internal potential under an alpha beta gamma coordinate systemαβγ *＝[eα *,eβ *,eγ *]T(ii) a For the positive sequence component u of the capacitor voltage under the abc coordinate systemCabc +Clarke transformation is carried out, and the transformed u is converted into a coordinate system of alpha, beta and gammaCαβγ＝[uCα,uCβ,uCγ]T；eαβγ *And uCαβγAfter comparison, the fundamental power reference current i is obtained through virtual impedance controlαβγ *＝[iα *,iβ *,iγ *]T；
4) FBD harmonic current, unbalanced current and reactive current detection based on the SGT filter;
by means of a load current iload＝[iloada,iloadb,iloadc]TPositive sequence component u of capacitor voltageCabc +And a phase theta, i is detected by a method based on the FBD harmonic current, unbalanced current and reactive current of the SGT filterloadThe non-fundamental wave active current component iloadh＝[iloadha,iloadhb,iloadhc]TIs separated out and i isloadhConverting the abc coordinate system into the alpha beta gamma coordinate system to obtain the harmonic reference current iloadh *＝[iloadhα *,iloadhβ *,iloadhγ *]T；
5) Current inner loop control based on a multiple quasi-PR controller;
reference current i of fundamental wave powerαβγ *And harmonic reference current iloadh *Adding to obtain a current loop reference value, and mixing the current loop reference value with the filter inductance current i subjected to Clarke transformationLαβγ＝[iLα,iLβ,iLγ]TComparing, and compensating the fundamental wave and 5, 7, 11, 13 harmonic components of each component in the alpha beta gamma coordinate system by adopting multi-quasi-PR control to obtain a voltage signal u to be modulated in the alpha beta gamma coordinate systemmod＝[umodα,umodβ,umodγ]T；
6)3D-SVPWM modulation generates a four-bridge arm circuit driving signal;
by a 3D-SVPWM modulation method, the voltage signal u to be modulated under the alpha beta gamma coordinate system obtained in the step 5) is utilizedmodAnd generating a three-phase four-bridge arm inverter driving signal.
2. The virtual synchronous generator control with electric energy quality composite control function according to claim 1The method is characterized in that: the virtual impedance comprises a virtual resistance RvAnd a virtual reactance LvThe physical significance of the virtual impedance is identical to that of stator resistance and synchronous inductance of the synchronous generator, and omega is setnLv＞＞Rv，ωnIs the nominal angular frequency.
3. The virtual synchronous generator control method with the electric energy quality composite control function according to claim 1, characterized in that: the low-pass filter is realized by adopting a sliding Goertzel algorithm in an FBD harmonic detection algorithm based on an SGT filter.
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