CN112803803B - Flexible multi-state switch control method and system based on fuzzy logic PI controller - Google Patents

Flexible multi-state switch control method and system based on fuzzy logic PI controller Download PDF

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CN112803803B
CN112803803B CN202110125900.9A CN202110125900A CN112803803B CN 112803803 B CN112803803 B CN 112803803B CN 202110125900 A CN202110125900 A CN 202110125900A CN 112803803 B CN112803803 B CN 112803803B
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voltage
power
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CN112803803A (en
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马晓芳
吉耀辉
李有池
曹彪
姜峰
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China North Industries Group Corp No 214 Research Institute Suzhou R&D Center
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices

Abstract

The invention discloses a fuzzy logic PI controller-based flexible multi-state switch control method, which comprises the steps of determining the input and output power of a three-terminal flexible multi-state switch when a system is in a steady state and the voltage of a direct current side is constant; according to the input and output power of the three-terminal flexible multi-state switch, active power and reactive power are adopted to control outer rings on the VSC1 side and the VSC3 side to obtain reference estimated current values of the VSC1 side and the VSC3 side, and then the reference estimated current values of the VSC1 side and the VSC3 side are respectively superposed with current correction quantities to obtain respective output current reference values; the method comprises the steps that a fixed direct-current voltage control is adopted for an outer ring on the VSC2 side, and an output current reference value of the VSC2 side is obtained through a PI controller; the fuzzy logic PI controller is adopted for calculating the actually measured output current and the output current reference value of the three inner rings of the VSC1, the VSC2 and the VSC3 to obtain the output reference voltage, and the output reference voltage is converted by the SPWM to obtain the converter gate trigger signal.

Description

Flexible multi-state switch control method and system based on fuzzy logic PI controller
Technical Field
The invention belongs to the technical field of power grid control, and particularly relates to a flexible multi-state switch control method and system based on a fuzzy logic PI controller.
Background
With the rapid development of power systems, a large number of intermittent Distributed Generators (DG) and loads are connected to a power distribution network, which poses a more serious challenge to the power quality of a power grid, and a single-function or mode power quality control device cannot meet the use requirement. The multifunctional and multi-mode smart grid becomes a trend, and the stability of a power system can be effectively ensured by safe, reliable, high-quality and efficient operation of the smart grid.
The flexible multi-state switch (FMSS) can replace a section switch on a feeder line or a tie switch between feeder lines, is connected with a plurality of feeder lines of a distribution network, performs three-terminal or multi-port operation, and is a flexible adjusting device capable of supporting flexible scheduling and control of a power grid. Different control methods are applied to each port of the power line, so that various functions of bidirectional active power flow among feeders, reactive compensation control, short-circuit current suppression, power flow optimization, electric energy quality control and the like can be realized.
In many converter-based power quality improvement devices, a PI controller is usually selected for parameter tuning. However, the parameter change, load disturbance and nonlinear characteristics of the actual power grid have a large influence on the design of the conventional PI controller, and a good effect cannot be achieved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a flexible multi-state switch control method based on a fuzzy logic PI controller, which can adjust PI control parameters on line according to the dynamic change characteristics of an actual power grid, reduce the influence of load disturbance and improve the adaptability and robustness of a flexible multi-state switch.
The technical problem to be solved by the invention is realized by the following technical scheme:
in a first aspect, a flexible multi-state switch control method based on a fuzzy logic PI controller is provided, which includes:
determining the input power and the output power of the three-terminal flexible multi-state switch when the system is in a steady state and the voltage of the direct current side is constant;
according to the input and output power of the three-terminal flexible multi-state switch, active power and reactive power are adopted to control outer rings on the VSC1 side and the VSC3 side to obtain reference estimated current values of the VSC1 side and the VSC3 side, and then the reference estimated current values of the VSC1 side and the VSC3 side are respectively superposed with current correction quantities to obtain respective output current reference values; the method comprises the steps that a fixed direct-current voltage control is adopted for an outer ring on the VSC2 side, and an output current reference value of the VSC2 side is obtained through a PI controller;
and calculating the actually measured output current and the output current reference value by adopting a fuzzy logic PI controller for three side inner rings of VSC1, VSC2 and VSC3 to obtain an output reference voltage, and converting the output reference voltage by SPWM to obtain a converter gate trigger signal.
With reference to the first aspect, further, the determining input and output powers of the three-terminal flexible multi-state switch when the system is in a steady state and the dc side voltage is constant is specifically:
the dynamic differential equation in the three-phase stationary abc coordinate system is expressed as:
Figure GDA0003538522250000021
wherein, R is equivalent impedance of the converter side, L is inductance of the converter side, ikjFor the phase current of an AC system, EkjPhase voltage of AC system, mkjAs a function of the three-phase bridge arm switches, UdcIs a direct current side voltage;
the direct-current side voltage dynamic equation is expressed as:
Figure GDA0003538522250000022
wherein C is a DC side capacitor, idcjCurrent flows into or out of the direct current side of the converter;
dq conversion of the formulae (1) and (2) gives the formulae (3) and (4) as follows:
Figure GDA0003538522250000023
Figure GDA0003538522250000024
wherein idjAnd iqjRespectively, the axial component, ω, of the current in the rotating dq coordinate systemjPhase voltage angular frequency, m, of a three terminal AC systemdjAnd mqjAxial component, E, of the switching modulation function of the three-sided converter in the rotating dq coordinate systemdjAnd EqjRespectively, the axial components of the voltage vector in the rotating dq coordinate system;
neglecting the switching loss of the converter, when the system is in a steady state and the direct-current side voltage Udc is constant according to the formulas (3) and (4), the three-side input or output power of the flexible multi-state switch is as follows:
Figure GDA0003538522250000025
wherein, PjActive power, Q, being input or output on three sidesjReactive power is input or output on three sides.
With reference to the first aspect, further, active power and reactive power are adopted to control the outer rings of the VSC1 and the VSC3 to obtain reference estimated current values of the two, and then the reference estimated current values of the two are respectively superposed with current correction amounts to obtain respective output current reference values, which specifically are:
active power and reactive power are adopted for controlling outer rings of the VSC1 and the VSC3, and a steady state inverse model obtained through conversion of a formula (5) is as shown in a formula (6):
Figure GDA0003538522250000031
wherein id’、iq' d and q axis components of the reference estimated current value, respectively; pref、QrefRespectively outputting an active power reference value and a reactive power reference value for the converter;
will id’、iq' separately superimposing d-axis current correction Δ idAnd q-axis current correction amount Δ iqObtaining an output current reference value idrefAnd iqref。
With reference to the first aspect, further, the d-axis current correction amount Δ idOutputting an active power actual value P and a reference value P through a converterrefThe error is obtained by calculation of a PI controller; the Q-axis current correction is obtained by outputting an actual reactive power value Q and a reference reactive power value Q by a converterrefThe error of (2) is calculated by the PI controller.
With reference to the first aspect, further, the constant dc voltage control is adopted for the VSC2 side outer ring, and the obtaining of the output current reference value by using the PI controller specifically includes:
the outer ring at the VSC2 side is controlled by constant direct current voltage, and the actual value U of the direct current side voltage is directly controlleddcAnd a reference value UdcrefIs converted into d-axis current by PI controllerComponent reference value idrefThe actual value Q of the reactive power and the reference value Q of the reactive power are calculatedrefIs converted into a q-axis current component reference value i by a PI controllerqrefOr the AC voltage is output by a value VrmsAnd a reference value VrmsrefIs converted into a q-axis current component reference value i by a PI controllerqref。
With reference to the first aspect, further, the method for obtaining the converter gate trigger signal specifically includes:
the parameter setting value of the PI controller adopting the fuzzy logic algorithm is as follows:
Figure GDA0003538522250000032
Figure GDA0003538522250000033
where e is the axial component i of the current in the rotating dq coordinate systemdj、iqjΔ e is a reference value i of the axial component of the current in the rotating dq coordinate systemdref、iqref，ΔKP、ΔKIController adjustment value, K, derived for a fuzzy parameter regulatorP *、KI *For the current controller setting value, KP、KIOutputting a setting value;
and (3) obtaining a converter output voltage instruction according to the formula (8), generating a corresponding modulation signal according to the voltage instruction, and using the pulse signal as a gate trigger pulse for triggering the three-side converter by the modulator so as to control the output instantaneous value of the converter.
In a second aspect, a three-terminal flexible multi-state switch control system based on a fuzzy logic PI controller is provided, which includes:
a power determination module: the input and output power of the three-terminal flexible multi-state switch is determined when the system is in a steady state and the voltage of the direct current side is constant;
an outer loop control module: the control circuit is used for controlling active power and reactive power of outer rings on the sides of the VSC1 and the VSC3 according to input and output power of the three-terminal flexible multi-state switch to obtain reference estimated current values of the active power and the reactive power, and then superposing the reference estimated current values of the active power and the reactive power on current correction respectively to obtain respective output current reference values; the method comprises the steps that a fixed direct-current voltage control is adopted for an outer ring on the VSC2 side, and an output current reference value of the VSC2 side is obtained through a PI controller;
the inner ring control module: the fuzzy logic PI controller is used for calculating the actually measured output current and the output current reference value of the inner rings of the three sides including the VSC1, the VSC2 and the VSC3 to obtain the output reference voltage, and the output reference voltage is converted by the SPWM to obtain a converter gate trigger signal.
The invention has the beneficial effects that: when the parameters of the distribution network power system change, the PID parameters are corrected on line in real time, so that the controller adapts to any change of the parameters of the distribution network power system, particularly load change, the influence of load disturbance is reduced, and the adaptivity and robustness of the flexible multi-state switch are improved.
Drawings
FIG. 1 is a block diagram of a system for accessing a three-terminal flexible multi-state switch to a power distribution network according to the present invention;
FIG. 2 is a topological diagram of a VSC1 terminal of the three-terminal flexible multi-state switch in the invention;
FIG. 3 is a structural diagram of control of active power and reactive power of outer rings of a VSC1 side and a VSC3 side in the invention;
FIG. 4 is a diagram illustrating the control structure of the outer ring constant DC voltage on the VSC2 side in the present invention;
FIG. 5 is a diagram of the inner loop fuzzy logic PI control structure of the present invention.
Detailed Description
To further describe the technical features and effects of the present invention, the present invention will be further described with reference to the accompanying drawings and detailed description.
Example 1
As shown in fig. 1 to 5, the present invention provides a flexible multi-state switch control method based on a fuzzy logic PI controller, including:
determining input and output power of a three-terminal flexible multi-state switch when a system is in a steady state and the voltage of a direct current side is constant;
meanwhile, the loss of the current transformer and the corresponding line is expressed by equivalent impedance, and the loss of the current transformer and the switch is ignored
The method specifically comprises the following steps: the dynamic differential equation in the three-phase stationary abc coordinate system is expressed as:
Figure GDA0003538522250000051
wherein, R is equivalent impedance of the converter side, L is inductance of the converter side, ikjFor the phase current of an AC system, EkjPhase voltage of AC system, mkjAs a function of the three-phase bridge arm switches, UdcThe voltage of a direct current side is adopted, k represents the meaning phase in three phases of a power supply, and j represents one end of the three-end flexible multi-state switch;
the direct-current side voltage dynamic equation is expressed as:
Figure GDA0003538522250000052
wherein C is a DC side capacitor, idcjCurrent flows into or out of the direct current side of the converter;
dq conversion of the formulae (1) and (2) gives the formulae (3) and (4) as follows:
Figure GDA0003538522250000053
Figure GDA0003538522250000054
wherein idjAnd iqjRespectively, the axial component, ω, of the current in the rotating dq coordinate systemjPhase voltage angular frequency, m, of a three terminal AC systemdjAnd mqjAxial component, E, of the switching modulation function of the three-sided converter in the rotating dq coordinate systemdjAnd EqjRespectively, the axial components of the voltage vector in the rotating dq coordinate system;
neglecting the switching loss of the converter, when the system is in a steady state and the direct-current side voltage Udc is constant according to the formulas (3) and (4), the three-side input or output power of the flexible multi-state switch is as follows:
Figure GDA0003538522250000055
wherein, PjActive power, Q, being input or output on three sidesjReactive power is input or output on three sides.
Secondly, according to the input and output power of the three-terminal flexible multi-state switch, active power and reactive power are controlled on outer rings on the sides of the VSC1 and the VSC3 to obtain reference estimated current values of the active power and the reactive power, and then the reference estimated current values of the active power and the reactive power are respectively superposed with current correction to obtain respective output current reference values; the method comprises the steps that a fixed direct-current voltage control is adopted for an outer ring on the VSC2 side, and an output current reference value of the VSC2 side is obtained through a PI controller;
specifically, active power and reactive power control are adopted for outer rings on the VSC1 and the VSC3 sides, and a steady state inverse model obtained through conversion of a formula (5) is as shown in a formula (6):
Figure GDA0003538522250000061
wherein id’、iq' d and q axis components of the reference estimated current value, respectively; pref、QrefRespectively outputting an active power reference value and a reactive power reference value for the converter;
will id’、iq' separately superimposing d-axis current correction Δ idAnd q-axis current correction amount Δ iqObtaining an output current reference value idrefAnd iqref. Wherein the d-axis current correction amount Δ idOutputting an active power actual value P and a reference value P through a converterrefThe error is obtained by calculation of a PI controller; the Q-axis current correction is obtained by outputting an actual reactive power value Q and a reference reactive power value Q by a converterrefThe error of (2) is calculated by the PI controller.
The outer ring at the VSC2 side is controlled by constant direct current voltage, and the actual value U of the direct current side voltage is directly controlleddcAnd a reference value UdcrefIs converted into a d-axis current component reference value i by a PI controllerdrefThe actual value Q of the reactive power and the reference value Q of the reactive power are calculatedrefIs converted into a q-axis current component reference value i by a PI controllerqrefOr the AC voltage is output by a value VrmsAnd a reference value VrmsrefIs converted into a q-axis current component reference value i by a PI controllerqref。
Thirdly, calculating the actually measured output current and the output current reference value by adopting a fuzzy logic PI controller for three side inner rings of VSC1, VSC2 and VSC3 to obtain an output reference voltage, and converting the output reference voltage through SPWM to obtain a converter gate trigger signal; specifically, the method comprises the following steps:
the parameter setting value of the PI controller adopting the fuzzy logic algorithm is as follows:
Figure GDA0003538522250000062
Figure GDA0003538522250000063
where e is the axial component i of the current in the rotating dq coordinate systemdj、iqjΔ e is a reference value i of the axial component of the current in the rotating dq coordinate systemdref、iqref，ΔKP、ΔKIController adjustment value, K, derived for a fuzzy parameter regulatorP *、KI *For the current controller setting value, KP、KIOutputting a setting value;
d and q axis current component id、iqRespectively with a reference value idref、iqrefThe error of the converter is calculated by a formula (8) to obtain d and q axis output setting values, then the d and q axis output setting values are converted by inverse Park to obtain a converter output voltage instruction, a corresponding modulation signal is generated according to the voltage instruction, and the modulatorThe pulse signal is used as a gate trigger pulse for triggering the three-side converter so as to control the output instantaneous value of the converter.
Example 2
Provided is a three-terminal flexible multi-state switch control system based on a fuzzy logic PI controller, comprising:
a power determination module: the input and output power of the three-terminal flexible multi-state switch is determined when the system is in a steady state and the voltage of the direct current side is constant;
an outer loop control module: the control circuit is used for controlling active power and reactive power of outer rings on the sides of the VSC1 and the VSC3 according to input and output power of the three-terminal flexible multi-state switch to obtain reference estimated current values of the active power and the reactive power, and then superposing the reference estimated current values of the active power and the reactive power on current correction respectively to obtain respective output current reference values; the method comprises the steps that a fixed direct-current voltage control is adopted for an outer ring on the VSC2 side, and an output current reference value of the VSC2 side is obtained through a PI controller;
the inner ring control module: the fuzzy logic PI controller is used for calculating the actually measured output current and the output current reference value of the inner rings of the three sides including the VSC1, the VSC2 and the VSC3 to obtain the output reference voltage, and the output reference voltage is converted by the SPWM to obtain a converter gate trigger signal.
The invention relates to a flexible multi-state switch control method based on a fuzzy logic PI controller, which comprises the following steps:
the above embodiments do not limit the present invention in any way, and all technical solutions obtained by taking equivalent substitutions or equivalent changes fall within the scope of the present invention.

Claims (7)

1. A flexible multi-state switch control method based on a fuzzy logic PI controller is characterized by comprising the following steps:
determining the input power and the output power of the three-terminal flexible multi-state switch when the system is in a steady state and the voltage of the direct current side is constant;
according to the input and output power of the three-terminal flexible multi-state switch, active power and reactive power are adopted to control outer rings on the VSC1 side and the VSC3 side to obtain reference estimated current values of the VSC1 side and the VSC3 side, and then the reference estimated current values of the VSC1 side and the VSC3 side are respectively superposed with current correction quantities to obtain respective output current reference values; the method comprises the steps that a fixed direct-current voltage control is adopted for an outer ring on the VSC2 side, and an output current reference value of the VSC2 side is obtained through a PI controller;
and calculating the actually measured output current and the output current reference value by adopting a fuzzy logic PI controller for three side inner rings of VSC1, VSC2 and VSC3 to obtain an output reference voltage, and converting the output reference voltage by SPWM to obtain a converter gate trigger signal.
2. The flexible multi-state switch control method based on the fuzzy logic PI controller as claimed in claim 1, wherein: the input and output power of the three-terminal flexible multi-state switch when the system is in a steady state and the voltage of the direct current side is constant is determined as follows:
the dynamic differential equation in the three-phase stationary abc coordinate system is expressed as:
Figure FDA0003538522240000011
wherein, R is equivalent impedance of the converter side, L is inductance of the converter side, ikjFor the phase current of an AC system, EkjPhase voltage of AC system, mkjAs a function of the three-phase bridge arm switches, UdcIs a direct current side voltage;
the direct-current side voltage dynamic equation is expressed as:
Figure FDA0003538522240000012
wherein C is a DC side capacitor, idcjCurrent flows into or out of the direct current side of the converter;
dq conversion of the formulae (1) and (2) gives the formulae (3) and (4) as follows:
Figure FDA0003538522240000013
Figure FDA0003538522240000014
wherein idjAnd iqjRespectively, the axial component, ω, of the current in the rotating dq coordinate systemjPhase voltage angular frequency, m, of a three terminal AC systemdjAnd mqjAxial component, E, of the switching modulation function of the three-sided converter in the rotating dq coordinate systemdjAnd EqjRespectively, the axial components of the voltage vector in the rotating dq coordinate system;
neglecting the switching loss of the converter, when the system is in a steady state and the direct-current side voltage Udc is constant according to the formulas (3) and (4), the three-side input or output power of the flexible multi-state switch is as follows:
Figure FDA0003538522240000021
wherein, PjActive power, Q, being input or output on three sidesjReactive power is input or output on three sides.
3. The method according to claim 2, wherein the method comprises the following steps: the method comprises the following steps of controlling active power and reactive power of outer rings of the VSC1 and the VSC3 to obtain reference estimated current values of the active power and the reactive power, and then respectively superposing current correction quantities on the reference estimated current values of the active power and the reactive power to obtain respective output current reference values:
active power and reactive power are adopted for controlling outer rings of the VSC1 and the VSC3, and a steady state inverse model obtained through conversion of a formula (5) is as shown in a formula (6):
Figure FDA0003538522240000022
wherein id’、iq' d and q axis components of the reference estimated current value, respectively; pref、QrefRespectively outputting an active power reference value and a reactive power reference value for the converter;
will id’、iq' separately superimposing d-axis current correction Δ idAnd q-axis current correction amount Δ iqObtaining an output current reference value idrefAnd iqref。
4. The method for controlling the flexible multi-state switch based on the fuzzy logic PI controller as claimed in claim 3, wherein: the d-axis current correction amount Δ idOutputting an active power actual value P and a reference value P through a converterrefThe error is obtained by calculation of a PI controller; the Q-axis current correction is obtained by outputting an actual reactive power value Q and a reference reactive power value Q by a converterrefThe error of (2) is calculated by the PI controller.
5. The method according to claim 2, wherein the method comprises the following steps: the method comprises the following steps that constant direct-current voltage control is adopted for an outer ring on the VSC2 side, and the output current reference value obtained by using a PI controller is specifically as follows:
the outer ring at the VSC2 side is controlled by constant direct current voltage, and the actual value U of the direct current side voltage is directly controlleddcAnd a reference value UdcrefIs converted into a d-axis current component reference value i by a PI controllerdrefThe actual value Q of the reactive power and the reference value Q of the reactive power are calculatedrefIs converted into a q-axis current component reference value i by a PI controllerqrefOr the AC voltage is output by a value VrmsAnd a reference value VrmsrefIs converted into a q-axis current component reference value i by a PI controllerqref。
6. The flexible multi-state switch control method based on the fuzzy logic PI controller as claimed in claim 1, wherein: the method for obtaining the converter gate trigger signal specifically comprises the following steps:
the parameter setting value of the PI controller adopting the fuzzy logic algorithm is as follows:
Figure FDA0003538522240000031
Figure FDA0003538522240000032
where e is the axial component i of the current in the rotating dq coordinate systemdj、iqjΔ e is a reference value i of the axial component of the current in the rotating dq coordinate systemdref、iqref，ΔKP、ΔKIController adjustment value, K, derived for a fuzzy parameter regulatorP *、KI *For the current controller setting value, KP、KIOutputting a setting value;
and (3) obtaining a converter output voltage instruction according to the formula (8), generating a corresponding modulation signal according to the voltage instruction, and using the pulse signal as a gate trigger pulse for triggering the three-side converter by the modulator so as to control the output instantaneous value of the converter.
7. A three-terminal flexible multi-state switch control system based on a fuzzy logic PI controller is characterized by comprising:
a power determination module: the input and output power of the three-terminal flexible multi-state switch is determined when the system is in a steady state and the voltage of the direct current side is constant;
an outer loop control module: the control circuit is used for controlling active power and reactive power of outer rings on the sides of the VSC1 and the VSC3 according to input and output power of the three-terminal flexible multi-state switch to obtain reference estimated current values of the active power and the reactive power, and then superposing the reference estimated current values of the active power and the reactive power on current correction respectively to obtain respective output current reference values; the method comprises the steps that a fixed direct-current voltage control is adopted for an outer ring on the VSC2 side, and an output current reference value of the VSC2 side is obtained through a PI controller;
the inner ring control module: the fuzzy logic PI controller is used for calculating the actually measured output current and the output current reference value of the inner rings of the three sides including the VSC1, the VSC2 and the VSC3 to obtain the output reference voltage, and the output reference voltage is converted by the SPWM to obtain a converter gate trigger signal.
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