CN112821795B - Control method, circuit and system for parallel three-phase inverter based on wide-bandgap device and silicon-based device and readable storage medium - Google Patents
Control method, circuit and system for parallel three-phase inverter based on wide-bandgap device and silicon-based device and readable storage medium Download PDFInfo
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac 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
- H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac 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
- H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a parallel three-phase inverter control method, a circuit, a system and a computer readable storage medium based on a wide bandgap device and a silicon-based device. The invention calculates the driving signals for controlling the wide bandgap device and the silicon-based device of the parallel three-phase inverter based on the three-phase abc static coordinate system and the dq synchronous rotating coordinate system. The invention aims at the characteristic difference of the voltage type inverter and the current type inverter and the problems of the silicon-based device and the wide bandgap device at present, and specifically controls the two inverters to use the wide bandgap switching device and the silicon-based switching device, thereby fully playing the advantages of the two topologies and the two devices and obtaining the beneficial technical effect of compromise of the cost and the performance of the parallel inverter.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a parallel three-phase inverter control method, a circuit, a system and a readable storage medium based on a wide bandgap device and a silicon-based device.
Background
The inverter is a core device of a new energy power generation system, the traditional power electronic inverter still faces many challenges in efficiency, cost and power level, and the inverter is divided into a voltage type inverter and a current type inverter according to the fact that energy storage is carried out on a direct current side by using capacitance or inductance. The voltage type inverter has the excellent characteristics of strong robustness, high working efficiency, excellent current dynamic characteristics and complete control strategy; however, with the improvement of the driving power level, the switching loss of the voltage-type inverter is greatly increased, the large filter capacitor at the output end of the voltage-type inverter can also resonate with the inductor in the load, and the introduced electromagnetic interference easily causes the inverter bridge arm to break down, damages the converter and reduces the system reliability. On the other hand, the current-mode inverter has good reliability and overcurrent protection capability, good dynamic response characteristic of current, and capability of performing energy bidirectional flow and working in a four-quadrant operation mode; however, the current-mode inverter requires an additional forward series diode to have a reverse blocking capability, the on-state loss is increased, and the system structure is complicated. When the current-mode inverter operates in a square wave mode, the low-order harmonic rich in the output current of the current-mode inverter can introduce harmonic torque in a load motor and generate voltage spikes on leakage inductance. Compared with a single type of inverter, the parallel inverter has the advantages that the working efficiency, the running reliability, the current dynamic characteristics and the like are greatly improved, and the parallel inverter has good application prospect.
Since silicon (Si) material has suitable price and performance, the conventional parallel inverter uses silicon-based switching devices. However, in the parallel inverter, the voltage-type inverter needs to work at a high switching frequency, the switching loss of the corresponding silicon-based switching device is severe, and due to the limitation of the characteristics and the process level of the silicon material, the current silicon-based device gradually reaches the performance limit, and the requirements of related industries on high frequency, high power density, high voltage and the like cannot be continuously met. At present, Wide Bandgap (WBG) semiconductor materials, represented by silicon carbide (SiC) and gallium nitride (GaN), have opened a new face to the semiconductor industry. Compared with a Si device, the WBG device has the excellent characteristics of higher thermal conductivity, forbidden band width, critical breakdown field strength, lower power loss and the like. However, the voltage and current ratings of WBG devices are quite limited, much lower than Si-based devices; WBG devices also suffer from reliability problems, such as gate oxide degradation of SiC devices and current collapse of GaN devices.
Therefore, aiming at the characteristic difference of the voltage type inverter and the current type inverter and the problems of the silicon-based device and the wide bandgap device at present, how to control the two inverters by using the wide bandgap switching device and the silicon-based switching device is realized, so that the advantages of two topologies and two devices are fully exerted, and the compromise of the cost and the performance of the parallel inverter is realized to become a problem to be solved urgently.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a control method, a circuit, a system and a readable storage medium of a parallel three-phase inverter based on a wide bandgap device and a silicon-based device. In order to achieve the purpose of the invention, the technical scheme of the invention is as follows.
A method for controlling a parallel three-phase inverter based on a wide bandgap device and a silicon-based device, the parallel three-phase inverter comprising a current-type inverter and a voltage-type inverter, the method comprising:
carrying out coordinate transformation on the load reference current under the three-phase abc static coordinate system, and outputting a d-axis component and a q-axis component of the load reference current under the two-phase dq synchronous rotating coordinate system;
carrying out numerical calculation on a d-axis component and a q-axis component of the load reference current, and outputting amplitude information of the input reference current and phase information of the output reference current of the current type inverter;
the method comprises the steps that the input current amplitude of a current mode inverter is obtained in real time by sampling the input current of the current mode inverter;
comparing the input reference current amplitude of the current mode inverter with the actually measured input current amplitude of the current mode inverter, and outputting an error signal;
outputting a duty ratio signal based on the error signal, comparing the duty ratio signal with a corresponding triangular carrier, and generating a first PWM signal, wherein the first PWM signal is used for driving a silicon-based switching tube of a tracking current type inverter to output a reference current amplitude value to work;
comparing the modulation wave with the amplitude constant at 1/3 with 6 carriers with phases different by 60 degrees in sequence to generate a second PWM signal, wherein the second PWM signal is used for driving a silicon-based switching device of a three-phase inversion bridge arm of the current-mode inverter to work;
the method comprises the steps that three-phase output current amplitude and phase information of a current mode inverter are obtained in real time by sampling three-phase output current of the current mode inverter;
subtracting the actually measured three-phase current output by the current type inverter from the three-phase load reference current under the abc static coordinate system to obtain the three-phase output reference current of the voltage type inverter;
the method comprises the steps that three-phase output current amplitude and phase information of a voltage type inverter are obtained in real time by sampling three-phase output current of the voltage type inverter;
carrying out coordinate transformation on the output reference current of the voltage type inverter and the output current of the actually measured voltage type inverter under a three-phase abc static coordinate system, and respectively outputting the output reference current of the voltage type inverter and the d-axis component and the q-axis component of the output current of the actually measured voltage type inverter under a two-phase dq synchronous rotation coordinate system;
comparing a d-axis component and a q-axis component of a reference current output by the voltage type inverter with a d-axis component and a q-axis component of an output current of the voltage type inverter which are actually measured, and correspondingly outputting a d-axis component error signal and a q-axis component error signal;
calculating the d-axis component error signal and the q-axis component error signal respectively to obtain a d-axis component and a q-axis component of an output reference phase voltage of the voltage-type inverter respectively;
and outputting six paths of switching pulses according to the three-phase output reference phase voltage of the voltage-type inverter to respectively drive wide-bandgap devices of three-phase bridge arms of the voltage-type inverter.
Preferably, the voltage-type inverter uses wide-bandgap devices including but not limited to SiCMOSFET and gan hemt to provide main power in power frequency operation; the current-mode inverter uses silicon-based devices including, but not limited to, SiMOSFETs and SiIGBTs to provide a small portion of power at high frequency action while eliminating the low order harmonic power generated by the current-mode inverter.
Preferably, generating the PWM signal for driving the silicon-based devices of the three-phase legs of the current-mode inverter comprises: and 6 paths of PWM signals are generated by comparing a modulation wave with constant amplitude of 1/3 with 6 carriers with phases different by 60 degrees in sequence, and the silicon-based devices of the current-mode inverter are respectively driven to work.
Preferably, after the d-axis component and the q-axis component of the reference phase voltage are output, the d-axis component and the q-axis component of the reference phase voltage output by the voltage source inverter in the two-phase dq synchronous rotating coordinate system are converted to obtain the three-phase component of the reference phase voltage output by the voltage source inverter in the abc stationary coordinate system.
Preferably, a Space Vector Pulse Width Modulation (SVPWM) strategy is used to modulate the three-phase components of the voltage-type inverter output reference phase voltage in the abc stationary coordinate system.
A parallel three-phase inverter control circuit based on a wide bandgap device and a silicon-based device comprises:
the parallel three-phase inverter control circuit comprises a current source inverter Circuit (CSI) and a voltage source inverter circuit (VSI);
a first direct-current voltage source (1) of the current-type inverter circuit is connected to a first three-phase inverter bridge arm through an input current control unit;
the input current control unit comprises an inductor (Ldc), a silicon-based switching tube (T) and a diode (D); the silicon-based switching tube (T) is used for tracking the amplitude of the reference current output by the current type inverter;
each phase of upper and lower bridge arms of the first three-phase inverter bridge arm comprises a diode and a silicon-based switching device which are connected in series in the forward direction; the neutral point of each phase of bridge arm is connected to a public alternating current output end;
and a second direct-current voltage source (2) of the voltage type inverter (VSI) circuit is connected with a capacitor (Cdc) in parallel and then is connected with a second three-phase inverter bridge arm, each phase of upper and lower bridge arms of the second three-phase inverter bridge arm comprises a reverse parallel diode and a wide bandgap switch device, and a neutral point of each phase of bridge arm is connected with a public alternating-current output end through an LC filter circuit.
Preferably, the silicon-based switching devices (Tc 1-Tc 6) of each phase of the first three-phase inverter bridge arm adopt silicon-based insulated gate bipolar transistors, and provide main power through power frequency action;
the wide-bandgap switching devices (Tv 1-Tv 6) of each phase of the second three-phase inverter bridge arm adopt silicon carbide metal oxide semiconductor field effect transistors, provide a small part of power through high-frequency action, and simultaneously eliminate low-order harmonic power generated by power frequency action of the current type inverter.
A parallel three-phase inverter control system based on a wide bandgap device and a silicon-based device is composed of a current-type inverter control system and a voltage-type inverter control system;
the current source inverter control system includes: the device comprises a first A/D conversion module, a second A/D conversion module, a first adc-dq coordinate conversion module, a current-mode inverter output reference current information calculation module, a first comparator module, a PI controller module, a first PWM module and a second PWM module;
the first adc-dq coordinate transformation module performs coordinate transformation on the load reference current in the three-phase abc static coordinate system and outputs a d-axis component and a q-axis component of the load reference current in the two-phase dq synchronous rotation coordinate system;
the current type inverter output reference current information calculation module carries out numerical calculation by adopting a d-axis component and a q-axis component of the load reference current output by the first adc-dq coordinate transformation module, and outputs amplitude and phase information of the reference current output by the current type inverter;
the first A/D conversion module obtains the amplitude information of the input current of the current mode inverter in real time by sampling the input current of the current mode inverter;
the first comparator module compares the output reference current amplitude of the current mode inverter with the actually measured output current amplitude of the current mode inverter and outputs an error signal;
the PI controller module outputs a silicon-based switching tube duty ratio signal of a reference current amplitude output by the tracking current type inverter based on the error signal output by the comparator module;
the first PWM module compares a duty ratio signal output by the PI controller module with a corresponding triangular carrier to generate a PWM signal to drive a silicon-based switching tube which tracks the amplitude of a reference current output by a current type inverter to work; the second PWM module compares a modulation wave with constant amplitude of 1/3 with 6 carriers with phases different by 60 degrees in sequence to generate 6 paths of PWM signals to drive a silicon-based switching device of a first three-phase inverter bridge arm of the current-mode inverter to work respectively;
the second A/D conversion module obtains the three-phase output current amplitude and phase information of the current mode inverter in real time by sampling the three-phase output current of the current mode inverter;
the voltage type inverter control system comprises a third A/D conversion module, a second comparator module, a second adc-dq coordinate conversion module, a third adc-dq coordinate conversion module, a PI controller module in the D-axis direction, a PI controller module in the q-axis direction, a dq-abc coordinate conversion module and an SVPWM module;
the second comparator module subtracts the three-phase load reference current under the abc static coordinate system from the three-phase current output by the measurement CSI to obtain the three-phase output reference current of the VSI;
the third A/D conversion module obtains the amplitude and phase information of the three-phase output current of the voltage-type inverter in real time by adopting the three-phase output current of the VSI;
the second adc-dq coordinate transformation module and the third adc-dq coordinate transformation module respectively perform coordinate transformation on output reference current of the voltage type inverter and output current of the actually measured voltage type inverter under a three-phase abc static coordinate system, and respectively output d-axis component and q-axis component of the output reference current of the voltage type inverter and the actually measured VSI output current under a two-phase dq synchronous rotation coordinate system;
the third comparator module compares the d-axis component and the q-axis component of the reference current output by the voltage type inverter with the d-axis component and the q-axis component of the current output by the voltage type inverter which are actually measured, and correspondingly outputs error signals of the d-axis component and the q-axis component;
the d-axis PI controller module and the q-axis PI controller module respectively calculate a d-axis component error signal and a q-axis component error signal output by the third comparator module to respectively obtain a d-axis component and a q-axis component of an output reference phase voltage of the voltage-type inverter;
the dq-abc coordinate transformation module is used for transforming a d-axis component and a q-axis component of a voltage type inverter output reference phase voltage under a two-phase dq synchronous rotating coordinate system to obtain a three-phase component of the voltage type inverter output reference phase voltage under an abc static coordinate system;
the voltage-type inverter outputs multi-path switching pulses according to the output reference phase voltage to respectively drive silicon-based switching devices of the current-type inverter to work.
Preferably, before the voltage-type inverter outputs the reference phase voltage and the triangular carrier is compared, the SVPWM module sequentially performs the solution of the sector where the reference voltage vector is located, the solution of the basic voltage vector operating time and the solution of the vector switching time on the VSI output reference phase voltage output by the dq-abc coordinate transformation module, compares the VSI output reference phase voltage with the corresponding triangular carrier, and outputs 6 switching pulses to respectively drive the wide bandgap switching device of the voltage-type inverter to operate.
A readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the above-mentioned method.
Compared with the prior art, the invention has the beneficial technical effects that: the invention calculates the driving signals for controlling the wide bandgap device and the silicon-based device of the parallel three-phase inverter based on the three-phase abc static coordinate system and the dq synchronous rotating coordinate system. The invention aims at the characteristic difference of the voltage type inverter and the current type inverter and the problems of the silicon-based device and the wide bandgap device at present, and specifically controls the two inverters to use the wide bandgap switching device and the silicon-based switching device, thereby fully playing the advantages of the two topologies and the two devices and obtaining the beneficial technical effect of compromise of the cost and the performance of the parallel inverter.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a main circuit diagram of a parallel three-phase inverter based on a wide bandgap device and a silicon-based device according to the present invention;
FIG. 2 is a main circuit diagram of a parallel three-phase inverter based on SiCSMOSFET and SiIGBT according to the invention;
FIG. 3 is a control schematic diagram of a parallel three-phase inverter based on SiCSMOSFET and SiIGBT according to the present invention;
fig. 4 is a simulation waveform diagram of the parallel three-phase inverter based on the SiCMOSFET and the SiIGBT of the present invention in steady state operation under resistive load.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
Example one
The present example provides a parallel three-phase inverter control circuit based on a wide bandgap device and a silicon-based device, exemplarily, as shown in fig. 1-2, the parallel three-phase inverter control circuit based on the wide bandgap device and the silicon-based device includes a Current Source Inverter (CSI) and a Voltage Source Inverter (VSI), a dc voltage source 1 of the current source inverter is connected to a three-phase inverter bridge arm by using an input current controller composed of an inductor Ldc, a silicon-based switching tube T, and a diode D, an upper and a lower bridge arms of each phase are composed of a silicon-based switching device with a forward series diode, and a neutral point of the bridge arm of each phase is connected to a common ac output terminal of the corresponding phase; a direct current voltage source 2 of the voltage type inverter is connected with three-phase inverter bridge arms through a large parallel capacitor Cdc, the direct current voltage source 2 is equivalent to a direct current type through being connected with an input current control unit, upper and lower bridge arms of each phase are composed of a wide bandgap switch device with anti-series diodes, and a neutral point of each phase of bridge arm is connected with a common alternating current output end of the corresponding phase through an LC filter circuit; each phase common ac output is connected to a load of the respective phase. In this embodiment, the 6 silicon-based switching devices Tc1 to Tc6 of the current-mode inverter are siigbts (silicon-based insulated gate bipolar transistors), the operating frequency is 50Hz, and main power is provided by power frequency action;
specifically, the 6 wide bandgap switching devices Tv 1-Tv 6 of the voltage-type inverter adopt SiCMOSFET (silicon carbide metal oxide semiconductor field effect transistor), the working frequency is 1MHz, a small part of power is provided by high-frequency action, and low-order harmonic power generated by the power-frequency action of the current-type inverter is eliminated; diodes Dc 1-Dc 6 in the current source inverter, which are connected in series with SiIGBTs in the forward direction, are fast recovery diodes, and diodes Dv 1-Dv 6 in the voltage source inverter, which are connected in anti-parallel with SiMOSFETs, are Schottky diodes.
Example two
The present embodiment provides a method for controlling a parallel three-phase inverter based on a wide bandgap device and a silicon-based device, where the parallel three-phase inverter includes a current-type inverter and a voltage-type inverter, and as shown in a control schematic diagram of fig. 3, the method of the present embodiment includes:
carrying out coordinate transformation on the load reference current under the three-phase abc static coordinate system, and outputting a d-axis component and a q-axis component of the load reference current under the two-phase dq synchronous rotating coordinate system;
carrying out numerical calculation on a d-axis component and a q-axis component of the load reference current, and outputting amplitude information of the input reference current and phase information of the output reference current of the current type inverter;
the method comprises the steps that the input current amplitude of a current mode inverter is obtained in real time by sampling the input current of the current mode inverter;
comparing the input reference current amplitude of the current mode inverter with the actually measured input current amplitude of the current mode inverter, and outputting an error signal;
outputting a duty ratio signal based on the error signal, comparing the duty ratio signal with a corresponding triangular carrier, and generating a first PWM signal, wherein the first PWM signal is used for driving a silicon-based switching tube of a tracking current type inverter to output a reference current amplitude value to work;
comparing the modulation wave with the amplitude constant at 1/3 with 6 carriers with phases different by 60 degrees in sequence to generate a second PWM signal, wherein the second PWM signal is used for driving a silicon-based switching device of a three-phase inversion bridge arm of the current-mode inverter to work;
the method comprises the steps that three-phase output current amplitude and phase information of a current mode inverter are obtained in real time by sampling three-phase output current of the current mode inverter;
subtracting the actually measured three-phase current output by the current type inverter from the three-phase load reference current under the abc static coordinate system to obtain the three-phase output reference current of the voltage type inverter; because the three-phase load reference current is consistent with the phase of the three-phase current output by the current type inverter, the current subtraction refers to amplitude subtraction at corresponding time.
The method comprises the steps that three-phase output current amplitude and phase information of a voltage type inverter are obtained in real time by sampling three-phase output current of the voltage type inverter;
carrying out coordinate transformation on the output reference current of the voltage type inverter and the output current of the actually measured voltage type inverter under a three-phase abc static coordinate system, and respectively outputting the output reference current of the voltage type inverter and the d-axis component and the q-axis component of the output current of the actually measured voltage type inverter under a two-phase dq synchronous rotation coordinate system;
comparing a d-axis component and a q-axis component of a reference current output by the voltage type inverter with a d-axis component and a q-axis component of an output current of the voltage type inverter which are actually measured, and correspondingly outputting a d-axis component error signal and a q-axis component error signal;
calculating the d-axis component error signal and the q-axis component error signal respectively to obtain a d-axis component and a q-axis component of an output reference phase voltage of the voltage-type inverter respectively;
and outputting six paths of switching pulses according to the three-phase output reference phase voltage of the voltage-type inverter to respectively drive wide-bandgap devices of three-phase bridge arms of the voltage-type inverter.
Specifically, the wide bandgap devices used by the voltage-type inverter include, but are not limited to, SiCMOSFET and gan hemt, and provide main power by power frequency action; the current-mode inverter uses silicon-based devices including, but not limited to, SiMOSFETs and SiIGBTs to provide a small portion of power at high frequency action while eliminating the low order harmonic power generated by the current-mode inverter.
Specifically, generating the PWM signal for driving the silicon-based device of the three-phase bridge arm of the current source inverter includes: and 6 paths of PWM signals are generated by comparing a modulation wave with constant amplitude of 1/3 with 6 carriers with phases different by 60 degrees in sequence, and the silicon-based devices of the current-mode inverter are respectively driven to work.
And after the d-axis component and the q-axis component of the reference phase voltage are output, converting the d-axis component and the q-axis component of the reference phase voltage output by the voltage type inverter under the two-phase dq synchronous rotating coordinate system to obtain the three-phase component of the reference phase voltage output by the voltage type inverter under the abc static coordinate system.
Specifically, a Space Vector Pulse Width Modulation (SVPWM) strategy is adopted to modulate three-phase components of the voltage-type inverter output reference phase voltage in the abc static coordinate system.
EXAMPLE III
The embodiment provides a parallel three-phase inverter control system based on a wide bandgap device and a silicon-based device, wherein the three-phase inverter control system consists of a current-type inverter control system and a voltage-type inverter control system;
the current source inverter control system includes: the device comprises a first A/D conversion module, a second A/D conversion module, a first adc-dq coordinate conversion module, a current-mode inverter output reference current information calculation module, a first comparator module, a PI controller module, a first PWM module and a second PWM module;
the first adc-dq coordinate transformation module performs coordinate transformation on the load reference current in the three-phase abc static coordinate system and outputs a d-axis component and a q-axis component of the load reference current in the two-phase dq synchronous rotation coordinate system;
the current type inverter output reference current information calculation module carries out numerical calculation by adopting a d-axis component and a q-axis component of the load reference current output by the first adc-dq coordinate transformation module, and outputs amplitude and phase information of the reference current output by the current type inverter;
the first A/D conversion module obtains the amplitude information of the input current of the current mode inverter in real time by sampling the input current of the current mode inverter;
the first comparator module compares the output reference current amplitude of the current mode inverter with the actually measured output current amplitude of the current mode inverter and outputs an error signal;
the PI controller module outputs a silicon-based switching tube duty ratio signal of a reference current amplitude output by the tracking current type inverter based on the error signal output by the comparator module;
the first PWM module compares a duty ratio signal output by the PI controller module with a corresponding triangular carrier to generate a PWM signal to drive the silicon-based switching tube to work; the second PWM module compares a modulation wave with constant amplitude of 1/3 with 6 carriers with phases different by 60 degrees in sequence to generate 6 paths of PWM signals to drive a silicon-based switching device of the current-mode inverter to work respectively;
the second A/D conversion module obtains the three-phase output current amplitude and phase information of the current mode inverter in real time by sampling the three-phase output current of the current mode inverter;
the voltage type inverter control system comprises a third A/D conversion module, a second comparator module, a second adc-dq coordinate conversion module, a third adc-dq coordinate conversion module, a PI controller module in the D-axis direction, a PI controller module in the q-axis direction, a dq-abc coordinate conversion module and an SVPWM module;
the second comparator module subtracts the three-phase load reference current under the abc static coordinate system from the three-phase current output by the measurement CSI to obtain the three-phase output reference current of the VSI;
the third A/D conversion module obtains the amplitude and phase information of the three-phase output current of the voltage-type inverter in real time by adopting the three-phase output current of the VSI;
the second adc-dq coordinate transformation module and the third adc-dq coordinate transformation module respectively perform coordinate transformation on output reference current of the voltage type inverter and output current of the actually measured voltage type inverter under a three-phase abc static coordinate system, and respectively output d-axis component and q-axis component of the output reference current of the voltage type inverter and the actually measured VSI output current under a two-phase dq synchronous rotation coordinate system;
the third comparator module compares the d-axis component and the q-axis component of the reference current output by the voltage type inverter with the d-axis component and the q-axis component of the current output by the voltage type inverter which are actually measured, and correspondingly outputs error signals of the d-axis component and the q-axis component;
the d-axis PI controller module and the q-axis PI controller module respectively calculate a d-axis component error signal and a q-axis component error signal output by the third comparator module to respectively obtain a d-axis component and a q-axis component of an output reference phase voltage of the voltage-type inverter;
the dq-abc coordinate transformation module is used for transforming a d-axis component and a q-axis component of a voltage type inverter output reference phase voltage under a two-phase dq synchronous rotating coordinate system to obtain a three-phase component of the voltage type inverter output reference phase voltage under an abc static coordinate system;
the SVPWM module outputs reference phase voltage to the VSI output by the dq-abc coordinate transformation module in sequence:
(1) solving a sector where the reference voltage vector is located;
(2) solving the working time of the basic voltage vector;
(3) and (3) calculating the vector switching time and other steps, comparing the vector switching time with the corresponding triangular carrier, and outputting 6 paths of switching pulses to respectively drive the silicon-based switching devices of the voltage type inverter to work.
The current-mode inverter of the embodiment uses a silicon-based switching device with low cost and large capacity to provide main power by power frequency action; the voltage type inverter is used as an active filter, a wide bandgap switch device with high frequency and low loss can provide a small part of power by high-frequency action, and simultaneously, low-order harmonic power generated by power frequency action of the current type inverter is eliminated, so that the system loss and cost are greatly reduced, and the performance of the wide bandgap device is almost achieved.
As shown in fig. 4, in order to verify the excellent performance of the proposed parallel three-phase inverter based on the wide bandgap device and the silicon-based device, the parallel three-phase inverter based on the SiCMOSFET and the SiIGBT in this embodiment is simulated under the condition of three-phase symmetric resistive load, so as to obtain corresponding simulated waveform diagrams, specifically including the three-phase output current Icsi of the current-type inverter, the three-phase output current Ivsi of the voltage-type inverter, and the three-phase load current IL. The current type inverter outputs three-phase standard square waves with constant duty ratio of 1/3 and phase difference of 120 degrees in sequence, and has good operation reliability. At the moment, most power of the system is provided by the current source inverter, the switching loss of the system can be greatly reduced through power frequency action, but the output current of the current source inverter is rich in low-order harmonic waves due to low switching frequency. The voltage type inverter operates at a higher switching frequency, only provides a small part of power frequency current, and simultaneously serves as an active filter to eliminate low-order harmonic generated by power frequency action of the current type inverter, so that the power factor of a system is remarkably improved, the total harmonic distortion rate of the system is reduced, and the voltage type inverter has good dynamic response characteristic and ensures that the actually measured load current can quickly and accurately track the change of the load reference current.
According to the requirements of practical application occasions, corresponding component parameters and control loop parameters are reasonably set, so that the parallel three-phase inverter based on the wide bandgap device and the silicon-based device provided by the embodiment has good control system accuracy, high-efficiency working efficiency, good operation reliability, high cost performance and good application prospect in related power industries.
Example four
The present embodiment provides a readable storage medium on which a computer program is stored, which computer program, when being executed by a processor, implements the method of the second embodiment.
The embodiments of the present application are merely illustrative, and for example, the division of the units is only one logical functional division, and there may be other divisions when actually implementing, and for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. A parallel three-phase inverter control method based on wide bandgap devices and silicon-based devices, the parallel three-phase inverter comprising a current-type inverter and a voltage-type inverter, the control method comprising:
carrying out coordinate transformation on the load reference current under the three-phase abc static coordinate system, and outputting a d-axis component and a q-axis component of the load reference current under the two-phase dq synchronous rotating coordinate system;
carrying out numerical calculation on a d-axis component and a q-axis component of the load reference current, and outputting amplitude information of the input reference current and phase information of the output reference current of the current type inverter;
the method comprises the steps that the input current amplitude of a current mode inverter is obtained in real time by sampling the input current of the current mode inverter;
comparing the input reference current amplitude of the current mode inverter with the actually measured input current amplitude of the current mode inverter, and outputting an error signal;
outputting a duty ratio signal based on the error signal, comparing the duty ratio signal with a corresponding triangular carrier, and generating a first PWM signal, wherein the first PWM signal is used for driving a silicon-based switching tube of a tracking current type inverter to output a reference current amplitude value to work;
comparing the modulation wave with the amplitude constant at 1/3 with 6 carriers with phases different by 60 degrees in sequence to generate a second PWM signal, wherein the second PWM signal is used for driving a silicon-based switching device of a three-phase inversion bridge arm of the current-mode inverter to work;
the method comprises the steps that three-phase output current amplitude and phase information of a current mode inverter are obtained in real time by sampling three-phase output current of the current mode inverter;
subtracting actually measured three-phase output current of the current type inverter from three-phase load reference current under an abc static coordinate system to obtain three-phase output reference current of the voltage type inverter;
the method comprises the steps that three-phase output current amplitude and phase information of a voltage type inverter are obtained in real time by sampling three-phase output current of the voltage type inverter;
carrying out coordinate transformation on the output reference current of the voltage type inverter and the output current of the actually measured voltage type inverter under a three-phase abc static coordinate system, and respectively outputting the output reference current of the voltage type inverter and the d-axis component and the q-axis component of the output current of the actually measured voltage type inverter under a two-phase dq synchronous rotation coordinate system;
comparing a d-axis component and a q-axis component of a reference current output by the voltage type inverter with a d-axis component and a q-axis component of an output current of the voltage type inverter which are actually measured, and correspondingly outputting a d-axis component error signal and a q-axis component error signal;
calculating the d-axis component error signal and the q-axis component error signal respectively to obtain a d-axis component and a q-axis component of an output reference phase voltage of the voltage-type inverter respectively;
outputting six paths of switching pulses according to the output reference phase voltage of the voltage-type inverter to respectively drive wide bandgap devices of a three-phase bridge arm of the voltage-type inverter;
the wide bandgap device (Tv 1-Tv 6) used by each phase of the inverter bridge arm of the voltage type inverter comprises a SiCSMOSFET and/or a GaNHEMT, and provides main power by power frequency action; silicon-based devices (Tc 1-Tc 6) used by each phase of inverter bridge arm of the current-mode inverter comprise SiMOSFET and/or SiIGBT, and provide a small part of power by high-frequency action while eliminating low-order harmonic power generated by the current-mode inverter;
generating PWM signals for driving silicon-based devices of three-phase legs of a current-mode inverter includes: comparing a modulation wave with constant amplitude of 1/3 with 6 carriers with phases different by 60 degrees in sequence to generate 6 paths of PWM signals to drive a silicon-based device of the current-mode inverter to work respectively;
after the d-axis component and the q-axis component of the reference phase voltage are output, the d-axis component and the q-axis component of the reference phase voltage output by the voltage type inverter under the two-phase dq synchronous rotating coordinate system are converted to obtain the three-phase component of the reference phase voltage output by the voltage type inverter under the abc static coordinate system; and a Space Vector Pulse Width Modulation (SVPWM) strategy is adopted to modulate the three-phase components of the voltage type inverter output reference phase voltage in the abc static coordinate system.
2. A parallel three-phase inverter control circuit based on a wide bandgap device and a silicon-based device, the parallel three-phase inverter control circuit implementing the parallel three-phase inverter control method of claim 1, comprising:
the parallel three-phase inverter control circuit comprises a current source inverter Circuit (CSI) and a voltage source inverter circuit (VSI);
a first direct-current voltage source (1) of the current-type inverter circuit is connected to a first three-phase inverter bridge arm through an input current control unit;
the input current control unit comprises an inductor (Ldc), a silicon-based switching tube (T) and a diode (D), wherein the silicon-based switching tube (T) is used for tracking the amplitude of the output reference current of the current type inverter;
each phase of upper and lower bridge arms of the first three-phase inverter bridge arm comprises a diode and a silicon-based switching device which are connected in series in the forward direction; the neutral point of each phase of bridge arm is connected to a public alternating current output end;
and a second direct-current voltage source (2) of the voltage type inverter (VSI) circuit is connected with a capacitor (Cdc) in parallel and then is connected with a second three-phase inverter bridge arm, each phase of upper and lower bridge arms of the second three-phase inverter bridge arm comprises a reverse parallel diode and a wide bandgap switch device, and a neutral point of each phase of bridge arm is connected with a public alternating-current output end through an LC filter circuit.
3. The parallel three-phase inverter control circuit according to claim 2,
each phase of silicon-based switching device (Tc 1-Tc 6) of the first three-phase inverter bridge arm adopts a silicon-based insulated gate bipolar transistor and provides main power through power frequency action;
the wide-bandgap switching devices (Tv 1-Tv 6) of each phase of the second three-phase inverter bridge arm adopt silicon carbide metal oxide semiconductor field effect transistors, provide a small part of power through high-frequency action, and simultaneously eliminate low-order harmonic power generated by power frequency action of the current type inverter.
4. A parallel three-phase inverter control system based on a wide bandgap device and a silicon-based device, the parallel three-phase inverter control system being used for controlling the parallel three-phase inverter control circuit of claim 2 or 3, wherein the three-phase inverter control system is composed of a current-type inverter control system and a voltage-type inverter control system;
the current source inverter control system includes: the device comprises a first A/D conversion module, a second A/D conversion module, a first adc-dq coordinate conversion module, a current-mode inverter output reference current information calculation module, a first comparator module, a PI controller module, a first PWM module and a second PWM module;
the first adc-dq coordinate transformation module performs coordinate transformation on the load reference current in the three-phase abc static coordinate system and outputs a d-axis component and a q-axis component of the load reference current in the two-phase dq synchronous rotation coordinate system;
the current type inverter output reference current information calculation module carries out numerical calculation by adopting a d-axis component and a q-axis component of the load reference current output by the first adc-dq coordinate transformation module, and outputs amplitude and phase information of the reference current output by the current type inverter;
the first A/D conversion module obtains the amplitude information of the input current of the current mode inverter in real time by sampling the input current of the current mode inverter;
the first comparator module compares the output reference current amplitude of the current mode inverter with the actually measured output current amplitude of the current mode inverter and outputs an error signal;
the PI controller module outputs a silicon-based switching tube duty ratio signal of a reference current amplitude output by the tracking current type inverter based on the error signal output by the comparator module;
the first PWM module compares a duty ratio signal output by the PI controller module with a corresponding triangular carrier to generate a PWM signal to drive a silicon-based switching tube which tracks the amplitude of a reference current output by a current type inverter to work; the second PWM module compares a modulation wave with constant amplitude of 1/3 with 6 carriers with phases different by 60 degrees in sequence to generate 6 paths of PWM signals to drive a silicon-based switching device of a first three-phase inverter bridge arm of the current-mode inverter to work respectively;
the second A/D conversion module obtains the three-phase output current amplitude and phase information of the current mode inverter in real time by sampling the three-phase output current of the current mode inverter;
the voltage type inverter control system comprises a third A/D conversion module, a second comparator module, a second adc-dq coordinate conversion module, a third adc-dq coordinate conversion module, a PI controller module in the D-axis direction, a PI controller module in the q-axis direction, a dq-abc coordinate conversion module and an SVPWM module;
the second comparator module subtracts the three-phase load reference current under the abc static coordinate system from the three-phase current output by the measurement CSI to obtain the three-phase output reference current of the VSI;
the third A/D conversion module obtains the amplitude and phase information of the three-phase output current of the voltage-type inverter in real time by adopting the three-phase output current of the VSI;
the second adc-dq coordinate transformation module and the third adc-dq coordinate transformation module respectively perform coordinate transformation on output reference current of the voltage type inverter and output current of the actually measured voltage type inverter under a three-phase abc static coordinate system, and respectively output d-axis component and q-axis component of the output reference current of the voltage type inverter and the actually measured VSI output current under a two-phase dq synchronous rotation coordinate system;
the third comparator module compares the d-axis component and the q-axis component of the reference current output by the voltage type inverter with the d-axis component and the q-axis component of the current output by the voltage type inverter which are actually measured, and correspondingly outputs error signals of the d-axis component and the q-axis component;
the d-axis PI controller module and the q-axis PI controller module respectively calculate a d-axis component error signal and a q-axis component error signal output by the third comparator module to respectively obtain a d-axis component and a q-axis component of an output reference phase voltage of the voltage-type inverter;
the dq-abc coordinate transformation module is used for transforming a d-axis component and a q-axis component of a voltage type inverter output reference phase voltage under a two-phase dq synchronous rotating coordinate system to obtain a three-phase component of the voltage type inverter output reference phase voltage under an abc static coordinate system;
the voltage-type inverter outputs multi-path switching pulses according to the output reference phase voltage to respectively drive silicon-based switching devices of the current-type inverter to work.
5. The parallel three-phase inverter control system according to claim 4, wherein before the voltage type inverter output reference phase voltage is compared with the triangular carrier, the SVPWM module sequentially performs the solution of the sector where the reference voltage vector is located, the solution of the basic voltage vector operating time and the solution of the vector switching time on the VSI output reference phase voltage output by the dq-abc coordinate transformation module, and outputs 6 switching pulses to respectively drive the wide bandgap switching device of the voltage type inverter to operate after comparing with the corresponding triangular carrier.
6. A readable storage medium, having stored thereon a computer program which, when executed by a processor, carries out the method of claim 1.
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