CN113422562B - Three-phase switch reluctance motor system based on quasi-Z-source modular converter - Google Patents

Three-phase switch reluctance motor system based on quasi-Z-source modular converter Download PDF

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CN113422562B
CN113422562B CN202110701867.XA CN202110701867A CN113422562B CN 113422562 B CN113422562 B CN 113422562B CN 202110701867 A CN202110701867 A CN 202110701867A CN 113422562 B CN113422562 B CN 113422562B
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phase
quasi
power conversion
source
switch tube
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CN113422562A (en
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孙庆国
陈李枚
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Hebei University of Technology
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Hebei University of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/08—Reluctance motors
    • H02P25/092—Converters specially adapted for controlling reluctance motors
    • 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
    • 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
    • H02M7/53871—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 with automatic control of output voltage or current
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The invention relates to a three-phase switched reluctance motor system based on a quasi-Z-source modular converter. The quasi-Z source modular converter of the system consists of a front-end quasi-Z source circuit and four groups of power conversion units connected in parallel, wherein phase stator windings of a three-phase switched reluctance motor are connected among the four groups of power conversion units; the converter can realize four operation modes, namely a direct-connection mode, a non-direct-connection excitation mode, a non-direct-connection zero-voltage follow current mode and a non-direct-connection demagnetization mode. The invention can adjust the bus voltage by changing the direct duty ratio of the quasi Z-source modular converter, greatly expands the change range of the DC bus voltage, and further can realize the wide-range speed regulation of the motor. Meanwhile, the voltage of the bus is improved, the excitation and demagnetization processes can be accelerated, and the torque ripple is reduced. The invention relates to a three-phase switch reluctance motor system with high integration degree, high power density, high reliability and adjustable direct current bus voltage.

Description

Three-phase switch reluctance motor system based on quasi-Z-source modular converter
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a three-phase switched reluctance motor system based on a quasi-Z-source modular converter.
Background
As a source of power in the global industrial automation field, increasing of the supply and demand market scale of the motor driving system and increasing of the application environment and the operation condition of the motor driving system are increasingly complex, and more strict technical standards and higher technical requirements are provided for the cost, the environmental adaptability and the operation reliability of the motor driving system. Under the large background of global accelerated industrial automation and advocation of green intelligent manufacturing, the rare-earth-free switched reluctance motor becomes a research hotspot at home and abroad due to the outstanding advantages of low motor cost, strong adaptability to severe environments, good fault tolerance, strong sustainability of heavy load capacity and the like, and the research of the advanced control technology can provide support for national strategic demands.
Due to the double salient pole structure, the highly nonlinear magnetic circuit characteristic and the driving mode of split-phase excitation of the switched reluctance motor, the vibration noise is large and the torque pulsation is serious in the running process of the system. The most widely used asymmetric half-bridge converter topology is assembled from discrete switching devices, which has the disadvantages of low integration and power density, large size, and poor flexibility in power device selection. In order to adapt to the development trend that the requirements of the motor drive market on volume, cost, reliability, running performance and the like are higher and higher, the inherent advantages of the switched reluctance motor are inherited and strengthened, and a highly integrated switched reluctance motor driver system with wide application range and strong anti-interference capability is found to be very important for improving the power density of the system and reducing torque pulsation.
Considering the integration level, the volume and the application range of the switched reluctance motor system, a three-phase switched reluctance motor modular converter consisting of a full-bridge module and a double-switch module is provided. Because two standard and common switch modules are used, the system integration level and the device utilization rate are improved, and the device model selection range is widened. In the patent "a bipolar excitation control strategy for a three-phase SRM modular power converter" (ZL201610097014.9), a new phase leg operating mode is proposed, but the excitation voltage of one phase is low due to the two-phase series excitation in the modular power converter. The long excitation time and voltage level limitations increase torque ripple. In addition, under a complex working condition, the full-bridge switch module easily causes the problem of bridge arm direct connection due to electromagnetic interference, so that the modular converter has lower immunity and reliability, which weakens the advantage that the switched reluctance motor has good environmental adaptability.
Disclosure of Invention
The invention aims to inherit and strengthen inherent advantages of wide speed regulation, good adaptability to severe environments and the like of a switched reluctance motor, solve the technical problems of insufficient excitation voltage, low immunity and reliability and the like in the existing switched reluctance motor modular driving system research, make up and improve the defects of poor matching between a Z source/quasi-Z source network and the switched reluctance motor, low system integration level and the like, and provide a three-phase switched reluctance motor system based on a quasi-Z source modular converter. The quasi Z source modular converter is characterized in that a quasi Z source circuit is cascaded at the front end of the modular converter, the voltage of a direct current bus can be improved through the cascaded quasi Z source circuit, the excitation and demagnetization processes are accelerated, the speed regulation range of a motor is expanded, the direct connection state of a traditional full bridge is changed into the normal working state, and the interference resistance and the reliability of a system are enhanced. The invention relates to a three-phase switch reluctance motor system with high integration degree, high power density, high reliability and adjustable direct current bus voltage.
The technical scheme of the invention is as follows:
a three-phase switch reluctance motor system based on a quasi Z-source modular converter comprises a three-phase switch reluctance motor, a quasi Z-source modular converter, a position sensor, a stator winding current sensor, an output power supply current sensor, a bus voltage sensor and a controller for providing a driving signal for the quasi Z-source modular converter;
the controller is respectively connected with the quasi Z source modular converter, the position sensor, the stator winding current sensor, the output power supply current sensor and the bus voltage sensor; the quasi Z-source modular converter is respectively connected with the three-phase switched reluctance motor, the output power supply current sensor, the bus voltage sensor and the direct current power supply; the three-phase switched reluctance motor is respectively connected with the position sensor and the stator winding current sensor;
the quasi-Z source modular converter consists of a front-end quasi-Z source circuit and four groups of power conversion units connected in parallel, wherein phase stator windings of a three-phase switched reluctance motor are connected among the four groups of power conversion units and used for providing excitation for each phase stator winding of the switched reluctance motor;
wherein the front-end quasi-Z source circuit comprises a diode (D) with an anti-parallel connectionZ) Switch tube SZA first capacitor C1A second capacitor C2First inductor L1A second inductor L2(ii) a Wherein the first inductor L1One end of (1) and a DC power supply VinPositive pole connected, first inductor L1The other end of the switch tube SZOne terminal of (1), a first capacitor C1Negative electrode of (D) and anti-parallel diode (D)ZAre connected with the anode of a diode D in anti-parallel connectionZThe cathode (the other end of the first switch tube) and a second capacitor C2And the second inductor L2Is connected to one end of a second capacitor C2Negative electrode of and DC power supply VinNegative pole connected to a first capacitor C1And the second inductor L2The other end of (a) is connected;
in the four groups of parallel power conversion units, each power conversion unit comprises two switching tubes with anti-parallel diodes connected in series, namely the first group of power conversion units comprises two switching tubes S with anti-parallel diodes1，S2(ii) a The second group of power conversion units comprises two switching tubes S with anti-parallel diodes3，S4(ii) a The third group of power conversion units comprises two switching tubes S with anti-parallel diodes5，S6(ii) a The fourth group of power conversion units comprises two switching tubes S with anti-parallel diodes7，S8；
Four groups of upper switch tubes (S) of power conversion units1，S3，S5，S7) And a first capacitor C1The positive poles of the three groups of power conversion units are connected, and the switching tubes (S) are arranged on the front three groups of power conversion units1，S3，S5) The other end of the first three groups of power conversion units and a lower switch tube (S)2，S4，S6) Are all connected with the non-common end of the three-phase stator winding A, B, C, the three common ends are simultaneously connected, and four groups of lower switch tubes (S) of the power conversion units2，S4，S6，S8) And the other end of the second capacitor C2The negative electrodes are connected; upper switch tube S of fourth group power conversion unit7The other end of the upper switch tube and the lower switch tube S8And to a common terminal N of all phase stator windings.
The phase stator windings of the switched reluctance motor are in star connection and lead out a neutral line, namely one end of each three-phase stator winding is connected to a common terminal N;
the position sensor is used for detecting the position of the rotor of the three-phase switched reluctance motor;
the current sensor is used for detecting the corresponding three-phase stator winding current on the three-phase stator winding and outputting the power supply current;
the voltage sensor is used for detecting the voltage of the direct current bus;
the controller provides control signals to the power converter based on the rotor position, current and voltage signals.
All the switch tubes with the anti-parallel diodes adopt CoolMOS tubes or IGBTs with anti-parallel fast recovery diodes.
The operation method of the three-phase switched reluctance motor system based on the quasi-Z-source modular converter is characterized by comprising the following steps of:
during a phase current cycle, four current modes of operation exist for each phase stator winding: 1) a pass-through mode; 2) a non-through excitation mode; 3) a non-shoot-through zero voltage freewheel mode; 4) non-through demagnetization mode:
1) when the converter injects a through signal, the upper and lower switch tubes of a group of power conversion units are conducted simultaneously, namely the switch tubes (S)1，S2)、(S3，S4)、(S5，S6)、(S7，S8) The group of switching tubes in (1) is turned on; quasi-Z source diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, namely, the system is in a direct-through mode no matter what state the other three groups of power conversion unit switching tubes are in;
2) when the converter is not injecting the through signal, the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZAn upper switch tube (S) of a group of power conversion units of the switching-on and back-end modular converter1、S3、S5Or S7) And a lower switching tube (S) of another group of power conversion units2、S4、S6Or S8) Conducting, wherein the system is in a non-direct excitation mode;
3) when the converter is not injecting the through signal, the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the modular converter at the back end is switched on, only one switching tube is switched on, namely the switching tube S1、S2、S3、S4、S5、S6、S7、S8When any one of the switching tubes is switched on, the system is in a non-direct-connection zero-voltage follow current mode;
4) when the converter is not injecting the through signal, the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZOpening ofAnd all the switching tubes of the rear-end modular converter are turned off, and the system is in a non-through demagnetization mode at the moment.
The operation method of the three-phase switch reluctance motor system based on the quasi-Z source modular converter is characterized by comprising the following specific operation methods:
the turn-on angle of the three-phase winding of the switched reluctance motor A, B, C is defined as thetaonA、θonB、θonCAngle of closure thetaoffA、θoffB、θoffCDefining the flowing N point of each phase current as a positive direction, the rotor position angle as theta, and the excitation sequence as CA → A → AB → B → BC → C → CA;
when theta isonA≤θ<θoffCWhen the phase A and the phase C are conducted, the upper switch tube of the power conversion unit connected with the phase A stator winding and the lower switch tube of the power conversion unit connected with the phase C stator winding are conducted at the same time, and the quasi-Z source diode D is connected with the power conversion unitZForward conducting quasi-Z source switch tube SZThe power supply is switched on, and forms a complete loop with the output end of the quasi-Z source circuit, at the moment, A, C two-phase windings are connected in series for excitation, and the system is in a non-direct excitation mode; at this time, the direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the A-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein A, C two-phase windings are connected in series to follow current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the A-phase stator winding and the upper switch tube of the power conversion unit connected with the C-phase stator winding are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZAnd the current is switched on, and forms a complete loop with the output end of the quasi-Z source circuit, at the moment, A, C two-phase windings are connected in series for excitation, and the system is in a non-direct excitation mode. At this time, direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the C-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein A, C two-phase windings are connected in series to follow current, and the system is in a direct-through mode;
when theta isoffC≤θ<θonBWhen the phase C is turned off, the phase A is conducted, and the power conversion unit connected with the phase A stator winding is connectedThe upper switch tube and the lower switch tube of the power conversion unit connected with the neutral line are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, the A-phase winding is separately excited, the B-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, a through signal is injected into the upper and lower switching tubes of the power conversion unit connected with the A-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein the A-phase winding independently flows current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the A-phase stator winding and the upper switch tube of the power conversion unit connected with the neutral line are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, the A-phase winding is separately excited, the B-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, a direct signal is injected into the upper and lower switching tubes of the power conversion unit connected with the neutral line to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein the phase A winding independently freewheels at the moment, and the system is in a direct-through mode;
when theta isonB≤θ<θoffAWhen the power converter is in a state that the A phase and the B phase are conducted, the upper switch tube of the power conversion unit connected with the stator winding of the A phase and the lower switch tube of the power conversion unit connected with the stator winding of the B phase are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe power supply is switched on, and forms a complete loop with the output end of the quasi-Z source circuit, at the moment, A, B two-phase windings are connected in series for excitation, and the system is in a non-direct excitation mode; at this time, the direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the A-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein A, B two-phase windings are connected in series to follow current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the A-phase stator winding and the upper switch tube of the power conversion unit connected with the B-phase stator winding are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZIs turned on and is output with a quasi-Z source circuitThe output end forms a complete loop, at the moment, A, B two-phase windings are excited in series, and the system is in a non-direct excitation mode; at this time, direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the B-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein A, B two-phase windings are connected in series to follow current, and the system is in a direct-through mode;
when theta isoffA≤θ<θonCWhen the phase A is turned off, the phase B is conducted, an upper switch tube of the power conversion unit connected with the neutral line and a lower switch tube of the power conversion unit connected with the stator winding of the phase B are conducted simultaneously, and a quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, the B-phase winding is separately excited, the A-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, a through signal is injected into the upper and lower switching tubes of the power conversion unit connected with the neutral line to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein the A-phase winding independently flows current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the neutral line and the upper switch tube of the power conversion unit connected with the B-phase stator winding are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, the B-phase winding is separately excited, the A-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, a through signal is injected into the upper and lower switching tubes of the power conversion unit connected with the B-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein the B-phase winding independently flows current, and the system is in a direct-through mode;
when theta isonC≤θ<θoffBWhen the power conversion unit is in a power conversion state, the upper switch tube of the power conversion unit connected with the stator winding of the phase C is connected with the lower switch tube of the power conversion unit connected with the stator winding of the phase B, and the quasi-Z source diode D is connected with the power conversion unit of the phase CZForward conducting quasi-Z source switch tube SZOpening, forming a complete loop with the output end of the quasi-Z source circuit, and exciting B, C two-phase windings in series at the systemIn a non-through excitation mode; at this time, direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the C-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein B, C two-phase windings are connected in series to follow current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the C-phase stator winding and the upper switch tube of the power conversion unit connected with the B-phase stator winding are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZAnd the current is switched on, and a complete loop is formed with the output end of the quasi-Z source circuit, at the moment, B, C two-phase windings are connected in series for excitation, and the system is in a non-direct excitation mode. At this time, direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the B-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein B, C two-phase windings are connected in series to follow current, and the system is in a direct-through mode;
when theta isoffB≤θ<θonAWhen the phase B is turned off, the phase C is still conducted, an upper switch tube of the power conversion unit connected with the phase C stator winding and a lower switch tube of the power conversion unit connected with the neutral line are conducted simultaneously, and a quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, the C-phase winding is separately excited, the B-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the C-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein the C-phase winding independently flows current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the C-phase stator winding and the upper switch tube of the power conversion unit connected with the neutral line are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, the C-phase winding is separately excited, the B-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, a through signal is injected into the upper and lower switching tubes of the power conversion unit connected with the neutral line to conduct the power conversion unit, and the diode DZSubject to back pressureCut-off, quasi-Z source switch tube SZAnd (4) turning off, wherein the C-phase winding independently freewheels, and the system is in a direct-through mode.
In the three-phase switch reluctance motor power converter based on the quasi-Z source, the through control signal is a PWM signal with fixed frequency generated by voltage closed-loop control, and a switch tube S in the quasi-Z source circuitZThe control signal of (2) is the inversion of the through signal; and the switching tube signal of the rear-end modular converter is generated according to the three-phase stator winding current, the rotor position and the operation mode requirement, and the through signal and the rear-end modular converter signal are subjected to phase comparison to obtain a control signal of a final switching tube.
The operation method of the three-phase switched reluctance motor system based on the quasi-Z source modular converter is characterized in that in the three-phase switched reluctance motor power converter based on the quasi-Z source, a through signal injection path is as follows: when the A-phase stator winding is conducted in the forward direction, the through signal is injected into a power conversion unit switching tube connected with the A-phase stator winding; when the B-phase stator winding is conducted in the forward direction, the through signal is injected into a power conversion unit switching tube connected with the B-phase stator winding; when the C-phase stator winding is conducted in the forward direction, the through signal is injected into a power conversion unit switching tube connected with the C-phase stator winding; otherwise, the through signal acts on the power conversion unit switch tube connected with the neutral line.
The invention has the substantive characteristics that:
the invention provides a three-phase switched reluctance motor system based on a quasi-Z-source modular converter. A quasi-Z source circuit is cascaded at the front end of the modular converter to form a modular converter based on a quasi-Z source. The modular converter can provide a through path for the quasi-Z source circuit, the bus voltage can be improved, and the excitation and demagnetization processes can be accelerated. The quasi-Z-source modular converter can realize four operation modes, namely a direct-connection mode, a non-direct-connection excitation mode, a non-direct-connection zero-voltage follow current mode and a non-direct-connection demagnetization mode; due to the existence of the direct mode, the bus voltage can be adjusted by changing the direct duty ratio of the quasi-Z source modular converter, the change range of the direct current bus voltage is greatly expanded, and the wide-range speed regulation of the motor can be further realized. The power supply and the quasi-Z source inductor in the quasi-Z source modular converter are connected in series, and the output power supply current is continuous and has small ripples through the filtering action of the inductor. The switched reluctance motor stator windings in the switched reluctance motor system of the modular converter are connected in a star shape so that the phase stator winding current is bipolar current.
The invention has the beneficial effects that:
the invention provides a three-phase switch reluctance motor system based on a quasi-Z-source modular converter, wherein compared with a modular power converter, the quasi-Z-source modular converter not only keeps the advantages of high integration level and wide application range of the modular converter, but also improves the bus voltage through a cascaded front-end quasi-Z-source circuit, accelerates the excitation and demagnetization processes, and can increase the conduction angle to improve the output average torque while reducing the torque pulsation. The front-end quasi-Z source circuit avoids the problem of bridge arm direct connection of a full-bridge module due to electromagnetic interference, and compared with a modular converter, the system has stronger anti-interference capability and higher reliability. The direct current link voltage variation range can be greatly improved through the direct current voltage regulating effect of the quasi-Z source, the wide-range speed regulation of the motor can be realized, meanwhile, the adjustable bus voltage can realize higher direct current voltage utilization rate, the direct current bus voltage is regulated according to the running speed and the load level of the switched reluctance motor, and the motor efficiency is improved. Due to the filtering effect of the inductor in the quasi-Z source unit, the output power supply current is continuous and the ripple wave is lower than 20% by selecting proper inductance-capacitance parameters, and compared with the traditional converter in which the output power supply current is discontinuous and the ripple wave is large, the converter provided by the invention can obviously prolong the service life of energy storage sources (power supply sources such as batteries and fuel cells), and has important significance for electric automobiles.
Drawings
Fig. 1 is a diagram of a three-phase switched reluctance motor system based on a quasi-Z source modular converter.
Fig. 2 is a circuit topology diagram of a novel quasi-Z source modular converter.
Fig. 3 is an equivalent circuit diagram of a quasi-Z source, wherein fig. 3(a) is an equivalent circuit diagram of a front-end quasi-Z source circuit in a through state, and fig. 3(b) is an equivalent circuit diagram of a front-end quasi-Z source circuit in a non-through state.
Fig. 4 is a simulated waveform of the input power supply current.
Fig. 5 is an equivalent circuit diagram of an operation mode of the quasi-Z source modular converter, where fig. 5(a) is a schematic diagram of an equivalent circuit of a through mode of the quasi-Z source modular converter, fig. 5(b) is a schematic diagram of an equivalent circuit of a non-through excitation mode of the quasi-Z source modular converter, fig. 5(c) is a schematic diagram of an equivalent circuit of a non-through zero-voltage free-wheeling mode of the quasi-Z source modular converter, and fig. 5(d) is a schematic diagram of an equivalent circuit of a non-through demagnetization mode of the quasi-Z source modular converter.
Fig. 6 is a current circuit diagram when A, C two-phase stator windings are conducted in series, where fig. 6(a) is a current circuit diagram of a non-through excitation mode in which A, C two-phase stator windings are connected in series, and a phase current is positive and a phase current is negative. Fig. 6(b) A, C is a through mode current loop diagram with two-phase stator windings in series, phase a current being positive and phase C current being negative. Fig. 6(C) is a circuit diagram of a A, C non-through excitation mode current loop with two-phase stator windings in series, phase a current being negative and phase C current being positive. Fig. 6(d) is a direct mode current loop diagram of A, C two-phase stator windings in series, with phase a current negative and phase C current positive.
Fig. 7 is a current circuit diagram when the a-phase stator winding is solely on, in which fig. 7(a) is a non-through excitation mode current circuit diagram of the a-phase stator winding, and the a-phase current is positive. Fig. 7(b) is a through-mode current loop diagram of the a-phase stator winding, with the a-phase current being positive. Fig. 7(c) is a non-through excitation mode current loop diagram of the a-phase stator winding, with the a-phase current being negative. Fig. 7(d) is a through-mode current loop diagram of the phase a stator winding, with phase a current negative.
Fig. 8 is a current circuit diagram when A, B two-phase stator windings are conducted in series, where fig. 8(a) is a current circuit diagram of a non-through excitation mode in which A, B two-phase stator windings are connected in series, and a-phase current is positive and a-phase current is negative. Fig. 8(B) A, B is a through mode current loop diagram with two-phase stator windings in series, phase a current being positive and phase B current being negative. Fig. 8(c) is a circuit diagram of a A, B non-through excitation mode current loop in which two-phase stator windings are connected in series, with phase a current being negative and phase B current being positive. Fig. 8(d) is a direct mode current loop diagram of A, B two-phase stator windings in series, with phase a current negative and phase B current positive.
Fig. 9 is a current circuit diagram when the B-phase stator winding is solely conducted, wherein fig. 9(a) is a non-through excitation mode current circuit diagram of the B-phase stator winding, and the B-phase current is negative. Fig. 9(B) is a through-mode current loop diagram of the a-phase stator winding, with the B-phase current being negative. Fig. 9(c) is a non-through excitation mode current loop diagram of the B-phase stator winding, with the B-phase current being positive. Fig. 9(d) is a through-mode current loop diagram of the B-phase stator winding, with the B-phase current being positive.
Fig. 10 is a current circuit diagram when B, C two-phase stator windings are conducted in series, and fig. 10(a) is a current circuit diagram of a non-through excitation mode in which B, C two-phase stator windings are connected in series, where phase B is negative and phase C is positive. Fig. 10(B) B, C is a through mode current loop diagram with two-phase stator windings in series, phase B current being negative and phase C current being positive. Fig. 10(C) is a circuit diagram of a B, C non-through field mode current loop with two-phase stator windings in series, phase B current being positive and phase C current being negative. Fig. 10(d) is a direct mode current loop diagram of A, B two-phase stator windings in series, with phase B current positive and phase C current negative.
Fig. 11 is a current circuit diagram when the C-phase stator winding is solely conducted, in which fig. 11(a) is a non-through excitation mode current circuit diagram of the C-phase stator winding, and the C-phase current is positive. Fig. 11(b) is a direct mode current loop diagram of the C-phase stator winding, with the C-phase current being positive. Fig. 11(C) is a non-through excitation mode current loop diagram of the C-phase stator winding, with the C-phase current being negative. Fig. 11(d) is a through-mode current loop diagram of the C-phase stator winding, with the C-phase current being negative.
Fig. 12 is a schematic diagram of full-cycle conduction logic, through signal injection path and phase current for a quasi-Z source modular converter.
Detailed Description
In order to describe the present invention more specifically, the following detailed description is made of the technical solutions and the related working principles of the present invention with reference to the accompanying drawings and the detailed description.
The three-phase switch reluctance motor system based on the quasi-Z source modular converter is shown in figure 1 and comprises a three-phase switch reluctance motor, a quasi-Z source modular converter, a position sensor, a stator winding current sensor, an output power supply current sensor, a bus voltage sensor and a controller for providing a driving signal for the quasi-Z source modular converter;
the controller is respectively connected with the quasi Z-source modular converter, the position sensor, the stator winding current sensor, the output power supply current sensor and the bus voltage sensor; the quasi Z-source modular converter is respectively connected with the three-phase switched reluctance motor, the output power supply current sensor, the bus voltage sensor and the direct current power supply; the three-phase switch reluctance motor is respectively connected with the position sensor and the stator winding current sensor.
The stator winding current sensor and the position sensor are respectively used for detecting the stator winding current of the switched reluctance motor and the position of the motor rotor. The output power supply current sensor and the bus voltage sensor are respectively used for detecting the output power supply current and the direct current bus voltage V of the quasi Z-source modular converterDC. And the controller generates a control signal of a switching tube according to the rotor position, the stator winding current, the output power supply current and the bus voltage so as to control the quasi Z-source modular converter.
The switched reluctance motor phase stator windings are in star connection and lead out a neutral line, namely, one end of each three-phase stator winding is connected to a common terminal N.
As shown in fig. 2, the quasi-Z source modular converter is composed of a front-end quasi-Z source circuit and four groups of power conversion units connected in parallel, wherein phase stator windings of a three-phase switched reluctance motor are connected between the four groups of power conversion units and used for providing excitation for each phase stator winding of the switched reluctance motor;
wherein the front-end quasi-Z source circuit comprises a diode (D) with an anti-parallel connectionZ) Switch tube SZA first capacitor C1A second capacitor C2First inductor L1A second inductor L2(ii) a Wherein the first inductor L1One end of (1) and a DC power supply VinPositive pole connected, first inductor L1The other end of the switch tube SZOne terminal of (1), a first capacitor C1Negative electrode of (D) and anti-parallel diode (D)ZAre connected with the anode of the anode and are connected with the diode in anti-parallelPipe DZThe cathode (the other end of the first switch tube) and a second capacitor C2And the second inductor L2Is connected to one end of a second capacitor C2Negative electrode of and DC power supply VinNegative pole connected to a first capacitor C1And the second inductor L2The other end of the two is connected.
The first capacitor C1Positive electrode of and a second capacitor C2The voltage between the negative electrodes is the DC bus voltage VDCAnd the control electrode of the switching tube receives a signal provided by the controller.
In the four groups of parallel power conversion units, each power conversion unit comprises two switching tubes with anti-parallel diodes connected in series, namely the first group of power conversion units comprises two switching tubes S with anti-parallel diodes1，S2(ii) a The second group of power conversion units comprises two switching tubes S with anti-parallel diodes3，S4(ii) a The third group of power conversion units comprises two switching tubes S with anti-parallel diodes5，S6(ii) a The fourth group of power conversion units comprises two switching tubes S with anti-parallel diodes7，S8。
Wherein, the upper switch tubes (S) of the four groups of power conversion units1，S3，S5，S7) And a first capacitor C1The positive poles of the three groups of power conversion units are connected, and the switching tubes (S) are arranged on the front three groups of power conversion units1，S3，S5) The other end of the first three groups of power conversion units and a lower switch tube (S)2，S4，S6) Are all connected with the non-common end of the three-phase stator winding A, B, C, the three common ends are simultaneously connected, and four groups of lower switch tubes (S) of the power conversion units2，S4，S6，S8) And the other end of the second capacitor C2The negative electrodes are connected; upper switch tube S of fourth group power conversion unit7The other end of the upper switch tube and the lower switch tube S8And to a common terminal N of all phase stator windings.
All the switch tubes with the anti-parallel diodes adopt CoolMOS tubes or IGBTs with anti-parallel fast recovery diodes.
In a novel circuit topology, the quasi-Z source unit is used for increasing the voltage of a direct-current bus so as to realize quick excitation and demagnetization, the speed regulation range of the motor is expanded, and the principle of quasi-Z source voltage increase is shown in figure 3. In order to avoid abnormal operating conditions and to allow the quasi-Z source converter to operate under conditions of large load fluctuations, a quasi-Z source diode D is providedZIs additionally provided with an anti-parallel switch SZSwitching tube SZThe control signal of (2) is inverted for the through signal. When the front-end quasi-Z source unit works in a direct-current state, the circuit is as shown in FIG. 3(a), and the diode D is at this timeZForced turn-off, Sz turn-off, DC power supply VinAnd a capacitor C1Common direction inductor L1Energy charging and capacitance C2To the inductance L2And energy is charged, and at the moment:
Figure BDA0003130305870000081
when the front-end quasi-Z source unit is in the non-through state, the equivalent circuit is as shown in FIG. 3(b), and at this time, the diode DZConduction, Sz conduction, power supply and inductance L1Are jointly a capacitor C2Charging and simultaneously supplying power to the load, inductor L2Is a capacitor C1Charging, one can obtain:
Figure BDA0003130305870000082
Figure BDA0003130305870000083
wherein T is the switching period, T0For straight-through time, T1For non-through time, D is the through duty cycle, VDCIs the dc bus voltage.
When the voltage reaches a steady state, according to a volt-second balance principle, a positive volt-second value at two ends of the inductor is equal to a negative volt-second value, namely, the voltage at two ends of the inductor multiplied by the direct connection time is equal to the voltage at two ends of the inductor multiplied by the working time when the voltage is not in direct connection, so that the following conditions can be obtained:
Figure BDA0003130305870000084
the peak value of the voltage of the direct current bus is as follows:
Figure BDA0003130305870000085
wherein
Figure BDA0003130305870000086
Inductance L in steady state1And L2The average voltage across, B represents the boost factor.
The proposed converter topology utilizes the front-end quasi-Z source unit to change the direct-through state of the traditional full bridge into the normal working state, and realizes the single-stage boosting function from the direct-current input voltage to the direct-current bus voltage by controlling the direct-through duty ratio.
Just because the existence of the quasi-Z source network enables the quasi-Z source modular converter to have new characteristics which are not possessed by some traditional converters, the parameter design of the quasi-Z source network is very important, and the parameter design directly influences the performance of the converter during operation. In order to ensure the working performance of the converter, the inductor current ripple is required to be lower than 20%. Considering the requirement of current ripple and combining with the unique demagnetization mode property of the switched reluctance motor, the following parameter design formula can be obtained:
Figure BDA0003130305870000091
Figure BDA0003130305870000092
wherein ILIs the inductor current; l ismaxIs the maximum phase inductance, iAIs the A phase stator winding current, a is the voltage ripple coefficient; f. ofSIs the switching frequency; b is the current ripple factor.
Example 1
Simulation verification is carried out by taking a 1kW three-phase 12/8-pole switched reluctance motor as an example. The motor parameters are as follows:
TABLE I Motor parameters
Figure BDA0003130305870000093
Wherein the inductance is selected from 2mH inductance, L, according to equation (6)1＝L22 mH. The capacitance is 470uF capacitance, C, selected according to equation (7)1＝C2470 uF. Under the load condition of the rated rotating speed of 3000r/min and the rated torque of 3 N.m, the simulation waveform of the input power supply current is as shown in FIG. 4, the input current is about 15A, the current ripple is about 2.3A, the input power supply current ripple is about 15.3 percent and is less than 20 percent.
In a switched reluctance motor drive system of a modular power converter, there are three current modes of operation for each phase stator winding during a phase current cycle: 1) an excitation mode; 2) a zero voltage freewheel mode; 3) and (4) a demagnetization mode.
According to the invention, because the front-end quasi-Z source circuit is cascaded, the quasi-Z source converter has a through state, namely an upper switch tube and a lower switch tube in one power conversion unit are simultaneously conducted. Three working modes of the phase stator winding are excitation and zero-voltage follow current, and if a direct-connection state occurs in a demagnetization mode, the working mode of the phase stator winding current can be changed. Four current operating modes will be changed: 1) a pass-through mode; 2) a non-through excitation mode; 4) a non-shoot-through zero voltage freewheel mode; 4) a non-pass demagnetization mode. The through switching frequency can be selected to be 20Khz, and as the through switching frequency is far higher than the switching frequency of the modular converter, the phase current is considered to be constant in one through period and can be regarded as a constant current source. Meanwhile, since the capacitor has an equivalent series resistance and the inductor has a parasitic resistance, an equivalent circuit schematic diagram of the operating state of the quasi-Z source converter is shown in fig. 5. FIG. 5(a) is a through mode in which the anti-parallel diode DZTurn-off, Sz turn-off, modular converter set of powerThe two switching tubes of the transformation unit are conducted simultaneously, and the stator winding carries out follow current; FIG. 5(b) shows a non-shoot-through excitation mode in which the anti-parallel diode D is connectedZConducting in the forward direction, conducting Sz, conducting an upper switch tube of one group of power conversion units of the rear-end modular converter and a lower switch tube of the other group of power conversion units, and exciting a stator winding; FIG. 5(c) is a non-shoot-through zero voltage freewheel mode in which the anti-parallel diode DZConducting in the forward direction, conducting Sz, conducting only one switching tube of the rear-end modular converter, and conducting follow current on the stator winding; FIG. 5(D) shows a non-shoot-through demagnetization mode, in which the antiparallel diode D is connectedZAnd (3) conducting in the forward direction, turning on the Sz, turning off all switching tubes of the rear-end modular converter, and demagnetizing the stator winding through the anti-parallel diodes. When the through signal is injected in the non-through zero-voltage free-wheeling state, the system operation state is changed from fig. 5(c) to fig. 5(a), and the dynamic response performance of the switched reluctance motor is unchanged. When a through signal is injected in a non-through excitation state and a demagnetization state, the system operation state is passively changed from the states (b) and (d) in the figure 5 to the state (a) in the figure 5, namely when the through state occurs in the excitation mode or the demagnetization mode of the phase stator winding, the phase stator winding is changed into the free-flow mode.
When the converter injects a through signal, the upper and lower switch tubes of a group of power conversion units are conducted simultaneously, namely the switch tubes (S)1，S2)、(S3，S4)、(S5，S6)、(S7，S8) The group of switching tubes in (1) is turned on; quasi-Z source diode DZCut off by bearing back pressure, quasi-Z source switch tube SZAnd (4) turning off, namely, the system is in a through mode no matter what states the other three groups of power conversion unit switching tubes are.
When the converter is not injecting the through signal, the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZAn upper switch tube (S) of a group of power conversion units of the switching-on and back-end modular converter1、S3、S5Or S7) And a lower switching tube (S) of another group of power conversion units2、S4、S6Or S8) Conducting when the system is in non-direct excitationMode(s).
When the converter is not injecting the through signal, the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the modular converter at the back end is switched on, only one switching tube is switched on, namely the switching tube S1、S2、S3、S4、S5、S6、S7、S8When any one of the switch tubes is switched on, the system is in a non-direct-connection zero-voltage follow current mode.
When the converter is not injecting the through signal, the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZAnd (4) switching on, switching off all switching tubes of the rear-end modular converter, and keeping the system in a non-straight-through demagnetization mode at the moment.
The operation principle of the three-phase 12/8-pole switched reluctance motor used in the above simulation is explained in detail as an example. Because the boosting action of the quasi-Z source can accelerate the process of excitation demagnetization, the conduction angle can be increased to improve the output torque, and the conduction angle thetaon0 DEG, off angle thetaoff20 deg. is equal to. The conduction position of the phase A is defined as 0 degree by taking 90 degrees as an electric period. The excitation sequence of each phase is CA → A → AB → B → BC → C → CA → A → AB → B → BC → C → CA. The current inflow N point of each phase is defined as a positive direction, and the rotor position angle is defined as theta.
When the angle is more than or equal to 0 DEG and less than or equal to theta<At 5 deg.C, the A phase and C phase are conducted, S1、S6Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the current is switched on, A, C two-phase windings are excited in series, the system is in a non-direct excitation mode, and the current flow path is shown in fig. 6 (a); at this time, two switching tubes S of the power conversion unit connected with the A-phase stator winding are supplied1,S2Injecting a through signal when S1,S2When turned on, the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZAnd is turned off, the A, C two-phase windings freewheel in series, the system is in a through mode, and the current flow path is as shown in fig. 6 (b).
When the angle is less than or equal to 5 degrees<At 15 deg.C phase is turned off, phase A is turned on, and phase S is turned off1、S8Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tubeSZWhen the excitation is switched on, the A-phase winding is excited independently, the C-phase winding is demagnetized, the system is in a non-direct excitation mode, and the current circulation path is as shown in fig. 7 (a); at this time, two switching tubes S of the power conversion unit connected with the A-phase stator winding are supplied1,S2Injecting a through signal when S1,S2When turned on, the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZWhen off, the a phase winding freewheels and the system is in the through mode current flow path as shown in fig. 7 (b).
When the angle is less than or equal to 15 degrees<At 20 deg. the A phase and B phase are conducted, S1、S4Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the current is switched on, the A, B two-phase windings are connected in series and are magnetized, the system is in a non-direct excitation mode, and the current flow path is shown as fig. 8 (a); at this time, two switching tubes S of the power conversion unit connected with the A-phase stator winding are supplied1,S2Injecting a through signal when S1,S2When turned on, the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZAnd is turned off, the A, B two-phase windings freewheel in series, the system is in a through mode, and the current flow path is as shown in fig. 8 (b).
When the angle is more than or equal to 20 degrees<At 30 deg., phase A is turned off, phase B is turned on, and S7、S4Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the excitation is switched on, the winding of the phase B is excited independently, the winding of the phase A is demagnetized, the system is in a non-direct excitation mode, and the current circulation path is as shown in fig. 9 (a); at this time, two switching tubes S of the power conversion unit connected with the neutral line7,S8Injecting a through signal when S7,S8When turned on, the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZWhen the B-phase winding freewheels, the system is in the through mode, and the current flow path is as shown in fig. 9 (B).
When the angle is more than or equal to 30 degrees<At 35 deg.C, the B phase and C phase are conducted, S5、S4Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the B, C two-phase windings are excited in series, the system is in non-stateIn the through excitation mode, the current flow path is as shown in fig. 10 (a); at this time, two switching tubes S of the power conversion unit connected with the C-phase stator winding are supplied5,S6Injecting a through signal when S5,S6When turned on, the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZAnd is turned off, the C, B two-phase windings freewheel in series, the system is in a through mode, and the current flow path is as shown in fig. 10 (b).
When the angle is less than or equal to 35 degrees<At 45 deg., B phase is turned off, C phase is turned on, S5、S8Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the excitation is switched on, the C-phase winding is excited independently, the B-phase winding is demagnetized, the system is in a non-direct excitation mode, and the current circulation path is as shown in fig. 11 (a); at this time, two switching tubes S of the power conversion unit connected with the C-phase stator winding are supplied5,S6Injecting a through signal when S5,S6When turned on, the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZWhen the C-phase winding freewheels, the system is in the through mode, and the current flow path is as shown in fig. 11 (b).
When the angle is less than or equal to 45 degrees<At 50 deg.C, the C phase and A phase are conducted, S5、S2Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the current is switched on, the A, C two-phase windings are excited in series, the system is in a non-direct excitation mode, and the current flow path is shown in fig. 6 (C); at this time, two switching tubes S of the power conversion unit connected with the C-phase stator winding are supplied5,S6Injecting a through signal when S5,S6When turned on, the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZAnd is turned off, the A, C two-phase windings freewheel in series, the system is in a through mode, and the current flow path is as shown in fig. 6 (d).
When theta is less than or equal to 50 degrees<At 60 deg.C phase is turned off, phase A is turned on, and phase S is turned off7、S2Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the system is switched on, the A-phase winding is separately excited, the C-phase winding is demagnetized, the system is in a non-direct excitation mode, and a current flow pathThe diameter is shown in FIG. 7 (C); at this time, two switching tubes S of the power conversion unit connected with the neutral line7,S8Injecting a through signal when S7,S8When turned on, the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZAnd (d) is turned off, the A-phase winding independently freewheels, the system is in a through mode, and the current flow path is shown in figure 7 (d).
When the angle is more than or equal to 60 degrees<At 65 deg., the A phase and B phase are conducted, S3、S2Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the current is switched on, the A, B two-phase windings are excited in series, the system is in a non-direct excitation mode, and the current flow path is shown in fig. 8 (C); at this time, two switching tubes S of the power conversion unit connected with the stator winding of the B phase are supplied3,S4Injecting a through signal when S3,S4When turned on, the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZAnd is turned off, the A, B two-phase windings freewheel in series, the system is in a through mode, and the current flow path is as shown in fig. 8 (d).
When the angle is more than or equal to 65 degrees and less than or equal to theta<At 75 deg., phase A is turned off, phase B is turned on, and phase S3、S8Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the excitation is switched on, the winding of the phase B is excited independently, the winding of the phase A is demagnetized, the system is in a non-direct excitation mode, and the current circulation path is shown in fig. 9 (C); at this time, two switching tubes S of the power conversion unit connected with the stator winding of the B phase are supplied3,S4Injecting a through signal when S3,S4When turned on, the diode DZCut off under the condition of bearing back pressure, and a quasi-Z source switch tube SZAnd (d) is turned off, the B-phase winding freewheels independently, the system is in a through mode, and the current flowing path is shown in figure 9 (d).
When the angle is less than or equal to 75 degrees<At 80 deg.C, conducting phase B and phase C, and S3、S6Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the current is switched on, the C, B two-phase windings are excited in series, the system is in a non-direct excitation mode, and the current flow path is shown in fig. 10 (C); at the moment, the power connected with the stator winding of the B phase is convertedTwo switching tubes S of a unit3,S4Injecting a through signal when S3,S4When turned on, the diode DZCut off under the condition of bearing back pressure, and a quasi-Z source switch tube SZAnd is turned off, the C, B two-phase windings freewheel in series, the system is in a through mode, and the current flow path is as shown in fig. 10 (d).
When the angle is more than or equal to 80 degrees<At 90 deg. phase B is turned off, phase C is turned on, and phase S7、S6Simultaneously conducting, quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the excitation is switched on, the C-phase winding is excited independently, the B-phase winding is demagnetized, the system is in a non-direct excitation mode, and the current circulation path is as shown in fig. 11 (C); at this time, two switching tubes S of the power conversion unit connected with the neutral line7,S8Injecting a through signal when S7,S8When turned on, the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZAnd (d) is turned off, the C-phase winding freewheels independently, the system is in a through mode, and the current flow path is shown in figure 11 (d).
The full-period conduction logic and the phase stator winding current of the three-phase switched reluctance motor system based on the quasi-Z-source modular converter are shown in figure 12.
The converter is composed of standard switch modules, so that any power conversion unit can realize direct connection, direct connection signals are uniformly distributed to four power conversion units in order to enable a switching device to generate heat in a balanced mode and prolong the service life of the switching device, and the direct connection signals are shown in figure 12. When the A-phase stator winding is conducted in the forward direction, the through signal is injected into a power conversion unit switch tube S connected with the A-phase stator winding1,S2. When the B-phase stator winding is conducted in the forward direction, the through signal is injected into a power conversion unit switch tube S connected with the B-phase stator winding3,S4. When the C-phase stator winding is conducted in the forward direction, the through signal is injected into a power conversion unit switch tube S connected with the C-phase stator winding5,S6. Otherwise, the through signal acts on the switching tube S of the power conversion unit connected with the neutral wire7,S8. The even distribution of the power conversion units for the injection of the through signals can make the switching devices heat evenly.
The invention is not the best known technology.

Claims (5)

1. An operation method of a three-phase switch reluctance motor system based on a quasi-Z-source modular converter is characterized by comprising the following steps:
during a phase current cycle, four current modes of operation exist for each phase stator winding: 1) a pass-through mode; 2) a non-through excitation mode; 3) a non-shoot-through zero voltage freewheel mode; 4) non-through demagnetization mode:
1) when the converter injects a through signal, the upper and lower switch tubes of a group of power conversion units are simultaneously conducted, namely the switch tube S1-S2、S3-S4、S5-S6、S7-S8The group of switching tubes in (1) is turned on; quasi-Z source diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, namely, the system is in a direct-through mode no matter what state the other three groups of power conversion unit switching tubes are in;
2) when the converter is not injecting the through signal, the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZOne upper switch tube S of one group of power conversion units of switching-on and back-end modular converter1、S3、S5Or S7And a lower switch tube S of another group of power conversion units2、S4、S6Or S8Conducting, wherein the system is in a non-direct excitation mode;
3) when the converter is not injecting the through signal, the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZWhen the modular converter at the back end is switched on, only one switching tube is switched on, namely the switching tube S1、S2、S3、S4、S5、S6、S7、S8When any one of the switching tubes is switched on, the system is in a non-direct-connection zero-voltage follow current mode;
4) when the converter is not injecting the through signal, the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZAll switches of switch-on, back-end modular converterAll the pipes are switched off, and the system is in a non-straight-through demagnetization mode at the moment;
the specific operation method comprises the following steps:
the turn-on angle of the three-phase winding of the switched reluctance motor A, B, C is defined as thetaonA、θonB、θonCAngle of closure thetaoffA、θoffB、θoffCDefining the flowing N point of each phase current as a positive direction, the rotor position angle as theta, and the excitation sequence as CA → A → AB → B → BC → C → CA;
when theta isonA≤θ<θoffCWhen the power converter is in a state of being conducted, the A-phase stator winding is conducted, the upper switch tube of the power conversion unit connected with the A-phase stator winding is conducted with the lower switch tube of the power conversion unit connected with the C-phase stator winding at the same time, and the quasi-Z source diode D is connected with the power converterZForward conducting quasi-Z source switch tube SZThe power supply is switched on, and forms a complete loop with the output end of the quasi-Z source circuit, at the moment, A, C two-phase windings are connected in series for excitation, and the system is in a non-direct excitation mode; at this time, the direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the A-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein A, C two-phase windings are connected in series to follow current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the A-phase stator winding and the upper switch tube of the power conversion unit connected with the C-phase stator winding are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe power supply is switched on, and forms a complete loop with the output end of the quasi-Z source circuit, at the moment, A, C two-phase windings are connected in series for excitation, and the system is in a non-direct excitation mode; at this time, direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the C-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein A, C two-phase windings are connected in series to follow current, and the system is in a direct-through mode;
when theta is measuredoffC≤θ<θonBWhen the phase C is turned off, the phase A is conducted, an upper switch tube of the power conversion unit connected with the phase A stator winding and a lower switch tube of the power conversion unit connected with the neutral line are conducted simultaneously, and a quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, at the moment, the A-phase winding is excited independently, the B-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, the direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the A-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein the A-phase winding independently flows current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the A-phase stator winding and the upper switch tube of the power conversion unit connected with the neutral line are conducted at the same time, and a quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, the A-phase winding is separately excited, the B-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, a through signal is injected into the upper and lower switching tubes of the power conversion unit connected with the neutral line to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein the A-phase winding independently flows current, and the system is in a direct-through mode;
when theta isonB≤θ<θoffAWhen the power converter is in a state that the A phase and the B phase are conducted, the upper switch tube of the power conversion unit connected with the stator winding of the A phase and the lower switch tube of the power conversion unit connected with the stator winding of the B phase are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe power supply is switched on, and forms a complete loop with the output end of the quasi-Z source circuit, at the moment, A, B two-phase windings are connected in series for excitation, and the system is in a non-direct excitation mode; at this time, a through signal is injected into the upper and lower switching tubes of the power conversion unit connected with the A-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein A, B two-phase windings are connected in series to follow current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the A-phase stator winding and the upper switch tube of the power conversion unit connected with the B-phase stator winding are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe power supply is switched on, and forms a complete loop with the output end of the quasi-Z source circuit, at the moment, A, B two-phase windings are connected in series for excitation, and the system is in a non-direct excitation mode; for power conversion units connected to the stator winding of the B-phaseThe upper and lower switching tubes are connected by direct signal injection, and diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein A, B two-phase windings are connected in series to follow current, and the system is in a direct-through mode;
when theta isoffA≤θ<θonCWhen the phase A is turned off, the phase B is conducted, an upper switch tube of the power conversion unit connected with the neutral line and a lower switch tube of the power conversion unit connected with the stator winding of the phase B are conducted simultaneously, and a quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, the B-phase winding is separately excited, the A-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, a through signal is injected into the upper and lower switching tubes of the power conversion unit connected with the neutral line to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein the A-phase winding independently flows current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the neutral line and the upper switch tube of the power conversion unit connected with the B-phase stator winding are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, the B-phase winding is separately excited, the A-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, a through signal is injected into the upper and lower switching tubes of the power conversion unit connected with the B-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein the B-phase winding independently flows current, and the system is in a direct-through mode;
when theta isonC≤θ<θoffBWhen the power conversion unit is in a power conversion state, the upper switch tube of the power conversion unit connected with the stator winding of the phase C is connected with the lower switch tube of the power conversion unit connected with the stator winding of the phase B, and the quasi-Z source diode D is connected with the power conversion unit of the phase CZForward conducting quasi-Z source switch tube SZThe power supply is switched on, and forms a complete loop with the output end of the quasi-Z source circuit, at the moment, B, C two-phase windings are connected in series for excitation, and the system is in a non-direct excitation mode; at this time, direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the C-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein B, C two-phase windings are connected in series to follow current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the C-phase stator winding and the upper switch tube of the power conversion unit connected with the B-phase stator winding are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe power supply is switched on, and forms a complete loop with the output end of the quasi-Z source circuit, at the moment, B, C two-phase windings are connected in series for excitation, and the system is in a non-direct excitation mode; at this time, direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the B-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein B, C two-phase windings are connected in series to follow current, and the system is in a direct-through mode;
when theta isoffB≤θ<θonAWhen the phase B is turned off, the phase C is conducted, an upper switch tube of the power conversion unit connected with the phase C stator winding and a lower switch tube of the power conversion unit connected with the neutral line are conducted simultaneously, and a quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, the C-phase winding is separately excited, the B-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, direct signals are injected into the upper and lower switching tubes of the power conversion unit connected with the C-phase stator winding to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein the C-phase winding independently flows current, and the system is in a direct-through mode; or the lower switch tube of the power conversion unit connected with the C-phase stator winding and the upper switch tube of the power conversion unit connected with the neutral line are conducted simultaneously, and the quasi-Z source diode DZForward conducting quasi-Z source switch tube SZThe system is switched on and forms a complete loop with the output end of the quasi-Z source circuit, the C-phase winding is separately excited, the B-phase winding is demagnetized, and the system is in a non-direct excitation mode; at this time, a through signal is injected into the upper and lower switching tubes of the power conversion unit connected with the neutral line to conduct the power conversion unit, and the diode DZCut off by bearing back pressure, quasi-Z source switch tube SZTurning off, wherein the C-phase winding independently flows current, and the system is in a direct-through mode;
the three-phase switch reluctance motor system based on the quasi Z source modular converter comprises a three-phase switch reluctance motor, the quasi Z source modular converter, a position sensor, a stator winding current sensor, an output power supply current sensor, a bus voltage sensor and a controller for providing a driving signal for the quasi Z source modular converter;
the controller is respectively connected with the quasi Z source modular converter, the position sensor, the stator winding current sensor, the output power supply current sensor and the bus voltage sensor; the quasi Z-source modular converter is respectively connected with the three-phase switched reluctance motor, the output power supply current sensor, the bus voltage sensor and the direct current power supply; the three-phase switched reluctance motor is respectively connected with the position sensor and the stator winding current sensor;
the quasi-Z source modular converter consists of a front-end quasi-Z source circuit and four groups of power conversion units connected in parallel, wherein phase stator windings of a three-phase switched reluctance motor are connected among the four groups of power conversion units and used for providing excitation for each phase stator winding of the switched reluctance motor;
wherein, the front-end quasi-Z source circuit comprises a diode D with an anti-parallel connectionZSwitch tube SZA first capacitor C1Second capacitor C2First inductor L1A second inductor L2(ii) a Wherein the first inductor L1One end of (1) and a DC power supply VinPositive pole connected, first inductor L1The other end of the switch tube SZOne terminal of (1), a first capacitor C1Negative electrode of (D) and anti-parallel diode (D)ZAre connected with the anode of a diode D in anti-parallel connectionZAnd a second capacitor C2And the second inductor L2Is connected to one end of a second capacitor C2Negative electrode of and DC power supply VinNegative pole connected to the first capacitor C1And the second inductor L2The other end of (a) is connected;
in the four groups of parallel power conversion units, each power conversion unit comprises two serially connected switch tubes with anti-parallel diodes, namely the first group of power conversion units comprises two switches with anti-parallel diodesPipe S1，S2(ii) a The second group of power conversion units comprises two switching tubes S with anti-parallel diodes3，S4(ii) a The third group of power conversion units comprises two switching tubes S with anti-parallel diodes5，S6(ii) a The fourth group of power conversion units comprises two switching tubes S with anti-parallel diodes7，S8；
Upper switch tube S of four groups of power conversion units1，S3，S5，S7And a first capacitor C1The positive poles of the three groups of power conversion units are connected, and the upper switch tubes S of the front three groups of power conversion units1，S3，S5The other end of the first three groups of power conversion units and a lower switch tube S2，S4，S6Are all connected with the non-common end of the three-phase stator winding A, B, C, the three common ends are simultaneously connected, and the lower switch tubes S of the four groups of power conversion units2，S4，S6，S8And the other end of the second capacitor C2The negative electrodes are connected; upper switch tube S of fourth group power conversion unit7The other end of the upper switch tube and the lower switch tube S8And to a common terminal N of all phase stator windings.
2. The method of claim 1, wherein the through control signal is a fixed-frequency PWM signal generated by voltage closed-loop control, and the switch S in the pseudo-Z source circuit is a switch SZThe control signal of (2) is the inversion of the through signal; and the switching tube signal of the rear-end modular converter is generated according to the three-phase stator winding current, the rotor position and the operation mode requirement, and the through signal and the rear-end modular converter signal are subjected to phase comparison to obtain a control signal of a final switching tube.
3. The method of claim 1, wherein the through signal injection path in the pseudo-Z source based three-phase switched reluctance motor power converter comprises: when the A-phase stator winding is conducted in the forward direction, the through signal is injected into a power conversion unit switching tube connected with the A-phase stator winding; when the B-phase stator winding is conducted in the forward direction, the through signal is injected into a power conversion unit switching tube connected with the B-phase stator winding; when the C-phase stator winding is conducted in the forward direction, the through signal is injected into a power conversion unit switching tube connected with the C-phase stator winding; otherwise, the through signal acts on the power conversion unit switch tube connected with the neutral line.
4. The method according to claim 1, wherein in the quasi-Z source modular converter based three-phase switched reluctance motor system, the switched reluctance motor phase stator windings are connected in a star shape and lead out neutral lines, that is, one end of the three-phase stator windings is connected to a common terminal N;
the position sensor is used for detecting the position of the rotor of the three-phase switched reluctance motor;
the current sensor is used for detecting the corresponding three-phase stator winding current on the three-phase stator winding and outputting the power supply current;
the voltage sensor is used for detecting the voltage of the direct current bus;
the controller provides control signals to the power converter based on the rotor position, current and voltage signals.
5. The method according to claim 1, wherein in the three-phase switched reluctance motor system based on the pseudo-Z source modular converter, all the switch tubes with anti-parallel diodes are CoolMOS tubes or IGBTs with anti-parallel fast recovery diodes.
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