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Volume 46,Issue 6,2019 Table of Contents
2019, 46(6):1-7, 48.
Abstract:
In view of the poor speed tracking accuracy of permanent magnet synchronous motor (PMSM) under low speed operation, inputoutput precise feedback linearization control was used to explore highprecision PMSM lowspeed operation characteristics. In order to obtain better precise control performance, the decoupling model of PMSM inputoutput precision feedback linearization was obtained by differential homeomorphic transformation and feedback linearization theory. Then, based on this decoupling model, precise control of PMSM at low speed was achieved. Simulation and experimental results applied to PMSM showed that the proposed approach could quickly track load torque and command speed, and the system had advantages of small overshoot, small static error, high robustness and high control accuracy.
In view of the poor speed tracking accuracy of permanent magnet synchronous motor (PMSM) under low speed operation, inputoutput precise feedback linearization control was used to explore highprecision PMSM lowspeed operation characteristics. In order to obtain better precise control performance, the decoupling model of PMSM inputoutput precision feedback linearization was obtained by differential homeomorphic transformation and feedback linearization theory. Then, based on this decoupling model, precise control of PMSM at low speed was achieved. Simulation and experimental results applied to PMSM showed that the proposed approach could quickly track load torque and command speed, and the system had advantages of small overshoot, small static error, high robustness and high control accuracy.
2019, 46(6):8-14.
Abstract:
In order to overcome the disadvantages of large torque and current ripple in direct torque control of induction motor, an improved active disturbance rejection control (ADRC) speed controller was designed to replace the traditional PI controller. According to the mathematical model of induction motor and sliding mode variable structure control theory, a new sliding mode controller based on torque error and stator flux squared error was designed. In order to estimate the applied load torque and reduce the system uncertainties, a load torque observer based on supertwisting algorithm was designed. Supertwisting stator flux observer was designed to improve the observation accuracy. The steadystate optimal stator flux was obtained through optimization calculation and introduced into the speed regulation system. Simulation results showed that this control strategy could effectively reduce torque and current ripple, and had inhibitory effect on external disturbance. At the same time, it could reduce the motor running loss, and had good dynamic and steadystate performances.
In order to overcome the disadvantages of large torque and current ripple in direct torque control of induction motor, an improved active disturbance rejection control (ADRC) speed controller was designed to replace the traditional PI controller. According to the mathematical model of induction motor and sliding mode variable structure control theory, a new sliding mode controller based on torque error and stator flux squared error was designed. In order to estimate the applied load torque and reduce the system uncertainties, a load torque observer based on supertwisting algorithm was designed. Supertwisting stator flux observer was designed to improve the observation accuracy. The steadystate optimal stator flux was obtained through optimization calculation and introduced into the speed regulation system. Simulation results showed that this control strategy could effectively reduce torque and current ripple, and had inhibitory effect on external disturbance. At the same time, it could reduce the motor running loss, and had good dynamic and steadystate performances.
2019, 46(6):15-20.
Abstract:
Based on flux and torque’s expressions of surface permanent magnet synchronous motor (SPMSM) direct torque control (DTC) system using the amplitude and angle of applying voltage vector as variables, 9 voltage vectors with different amplitudes and angles were used as selectable voltage vectors and values of stator flux and torque at next sampling point after applying these voltage vectors were given using predictive control. Object function based on flux and torque’s errors was proposed. The predictive control of the SPMSM DTC system selects the applying voltage vector which aims to minimize object function. Simulation results showed that compared with switching table, the average value of evaluation function was reduced by 60.30% and root mean square errors (RMSEs) of torque and flux’s ripples were reduced by 62.92% and 45.05%. Compared with fixed voltage vector selection strategy, the average value of evaluation function was reduced by 15.93% and RMSEs of torque and flux’s ripples were reduced by 22.40% and 3.85%. Therefore, compared with switching table and fixed voltage vector selection strategy, the proposed strategy could reduce evaluation function, stator flux and torque’s errors.
Based on flux and torque’s expressions of surface permanent magnet synchronous motor (SPMSM) direct torque control (DTC) system using the amplitude and angle of applying voltage vector as variables, 9 voltage vectors with different amplitudes and angles were used as selectable voltage vectors and values of stator flux and torque at next sampling point after applying these voltage vectors were given using predictive control. Object function based on flux and torque’s errors was proposed. The predictive control of the SPMSM DTC system selects the applying voltage vector which aims to minimize object function. Simulation results showed that compared with switching table, the average value of evaluation function was reduced by 60.30% and root mean square errors (RMSEs) of torque and flux’s ripples were reduced by 62.92% and 45.05%. Compared with fixed voltage vector selection strategy, the average value of evaluation function was reduced by 15.93% and RMSEs of torque and flux’s ripples were reduced by 22.40% and 3.85%. Therefore, compared with switching table and fixed voltage vector selection strategy, the proposed strategy could reduce evaluation function, stator flux and torque’s errors.
2019, 46(6):21-26.
Abstract:
Highspeed permanent synchronous motor speed sensorless control had become a trend. When using the traditional model reference adaptive system (MRAS), due to the use of integral calculation, there were problems such as zero drift and phase shift in the flux linkage observation. An improved method was proposed. The voltage model and the current model flux linkage observation results were subtracted, and the error value was adjusted by the PI to compensate the voltage in the voltage model, which solved the above problem well and had excellent control performance. The simulation model was built in MATLAB/Simulink to verify the proposed method. Simulation results showed that the improved MRAS could accurately track the rotor speed and position over the full speed range, and it could still run stably under sudden load changes.
Highspeed permanent synchronous motor speed sensorless control had become a trend. When using the traditional model reference adaptive system (MRAS), due to the use of integral calculation, there were problems such as zero drift and phase shift in the flux linkage observation. An improved method was proposed. The voltage model and the current model flux linkage observation results were subtracted, and the error value was adjusted by the PI to compensate the voltage in the voltage model, which solved the above problem well and had excellent control performance. The simulation model was built in MATLAB/Simulink to verify the proposed method. Simulation results showed that the improved MRAS could accurately track the rotor speed and position over the full speed range, and it could still run stably under sudden load changes.
2019, 46(6):27-32.
Abstract:
The torque response of direct torque control (DTC) was faster than that of vector control. But conventional DTC had the disadvantages of torque ripple, flux ripple and large harmonic current, which may lead to higher copper loss of stator and lower driving efficiency. Based on the basic principle of DTC, a new control strategy, which used flux chain and torque fuzzy controller instead of traditional hysteresis comparator, was proposed to solve this problem. The conventional fuzzy controller may have insufficient fuzzy rules or insufficient application, which led to the deterioration of fuzzy control effect. The torque loop was added to the variable domain fuzzy control. The fuzzy DTC system was simulated by MATLAB/Simulink. The simulation results showed that the fuzzy control system could effectively suppress torque ripple, flux ripple and harmonic current.
The torque response of direct torque control (DTC) was faster than that of vector control. But conventional DTC had the disadvantages of torque ripple, flux ripple and large harmonic current, which may lead to higher copper loss of stator and lower driving efficiency. Based on the basic principle of DTC, a new control strategy, which used flux chain and torque fuzzy controller instead of traditional hysteresis comparator, was proposed to solve this problem. The conventional fuzzy controller may have insufficient fuzzy rules or insufficient application, which led to the deterioration of fuzzy control effect. The torque loop was added to the variable domain fuzzy control. The fuzzy DTC system was simulated by MATLAB/Simulink. The simulation results showed that the fuzzy control system could effectively suppress torque ripple, flux ripple and harmonic current.
2019, 46(6):33-37, 54.
Abstract:
Aiming at the problems of low precision control accuracy, large torque ripple and unstable switching frequency in traditional direct torque control (DTC) method, a DTC method based on second order sliding mode control for permanent magnet motor was proposed. Based on the second order sliding mode control principle, traditional flux controller and torque controller were replaced by sliding mode controller. Vectormodulating method was used to modulate the space voltage and the stability of switching frequency was improved. Also, dynamic and output performances of motor were improved. The simulation and experimental results showed that the control method could effectively reduce the current ripple and torque ripple. The antiinterference ability of control system was enhanced. The fast dynamic response and strong robust performance of motor were realized.
Aiming at the problems of low precision control accuracy, large torque ripple and unstable switching frequency in traditional direct torque control (DTC) method, a DTC method based on second order sliding mode control for permanent magnet motor was proposed. Based on the second order sliding mode control principle, traditional flux controller and torque controller were replaced by sliding mode controller. Vectormodulating method was used to modulate the space voltage and the stability of switching frequency was improved. Also, dynamic and output performances of motor were improved. The simulation and experimental results showed that the control method could effectively reduce the current ripple and torque ripple. The antiinterference ability of control system was enhanced. The fast dynamic response and strong robust performance of motor were realized.
2019, 46(6):38-43.
Abstract:
An improved sliding mode control speed regulator was proposed for permanent magnet linear synchronous motor (PMLSM) direct thrust control system which had the defects such as large overshoot, poor load disturbance resistance, slow response and so on. The weighted integral gain reaching law was combined with the constant speed reaching law to reduce the increase of the switching gain when the system was not in the sliding mode phase. The simulation compared with PI controller showed that the response time of the system speed under load change was shortened, and the antidisturbance ability was improved obviously when the improved sliding mode speed controller was applied to the PMLSM direct thrust control system.
An improved sliding mode control speed regulator was proposed for permanent magnet linear synchronous motor (PMLSM) direct thrust control system which had the defects such as large overshoot, poor load disturbance resistance, slow response and so on. The weighted integral gain reaching law was combined with the constant speed reaching law to reduce the increase of the switching gain when the system was not in the sliding mode phase. The simulation compared with PI controller showed that the response time of the system speed under load change was shortened, and the antidisturbance ability was improved obviously when the improved sliding mode speed controller was applied to the PMLSM direct thrust control system.
2019, 46(6):44-48.
Abstract:
The fixed noise covariance matrix fixed by the traditional extended Kalman filter (EKF) could not accurately satisfy the estimation requirement under dynamic and static conditions when observing the rotational speed of induction motor. Aiming at this problem, a fuzzy adaptive method was proposed. The method could adjust the noise covariance matrix parameters according to the state discriminator output, and solve the problem that the fixed noise covariance matrix could not acquire different parameters in different states at the same time. Simulation showed that the fuzzy adaptive EKF had higher accuracy and improved the antiinterference ability of the system.
The fixed noise covariance matrix fixed by the traditional extended Kalman filter (EKF) could not accurately satisfy the estimation requirement under dynamic and static conditions when observing the rotational speed of induction motor. Aiming at this problem, a fuzzy adaptive method was proposed. The method could adjust the noise covariance matrix parameters according to the state discriminator output, and solve the problem that the fixed noise covariance matrix could not acquire different parameters in different states at the same time. Simulation showed that the fuzzy adaptive EKF had higher accuracy and improved the antiinterference ability of the system.
2019, 46(6):49-54.
Abstract:
Permanent magnet brushless DC motors had been widely used in daily life and industrial fields. With the continuous improvement of control requirements, the traditional doubleclosedloop permanent magnet brushless motor control system had gradually failed to meet the actual needs. Aiming at the control requirements, a driving method combining the internal model control and the fuzzy control was proposed. On the basis of the combination of the internal model control and the doubleclosedloop control, the fuzzy control was added. The current loop was controlled by internal model PI, and the speed loop was controlled by internal model PI and fuzzy. The experimental results showed that the drive system based on fuzzy internal model control had obvious advantages compared with the traditional doubleclosedloop control system in terms of response speed, overshoot and torque fluctuation.
Permanent magnet brushless DC motors had been widely used in daily life and industrial fields. With the continuous improvement of control requirements, the traditional doubleclosedloop permanent magnet brushless motor control system had gradually failed to meet the actual needs. Aiming at the control requirements, a driving method combining the internal model control and the fuzzy control was proposed. On the basis of the combination of the internal model control and the doubleclosedloop control, the fuzzy control was added. The current loop was controlled by internal model PI, and the speed loop was controlled by internal model PI and fuzzy. The experimental results showed that the drive system based on fuzzy internal model control had obvious advantages compared with the traditional doubleclosedloop control system in terms of response speed, overshoot and torque fluctuation.
2019, 46(6):55-61.
Abstract:
In the distributed generation system connected to the inverter circuit, in order to solve the problem that the system dynamic response of the model predictive control (MPC) was poor when the circuit parameters changed, a method based on ABC threephase coordinates was proposed. This scheme was called advanced MPC with disturbance observer (DOB) (AdMPCDOB). It predicted the controlled current in two steps, and a proportional resonant (PR) regulator was used as the feedforward compensator of the MPC. Compensation could eliminate the periodic error of the predicted current and improve the ability to suppress specific harmonics. Taking into account the influence of circuit parameters and uncertain disturbances on the system, the inductive current DOB was used to accurately observe the MPC input signal. The theoretical analysis and simulation experiments showed that the improved control scheme could effectively improve the output power quality of the inverter and reduce the total harmonic distortion (THD) rate of the gridconnected current.
In the distributed generation system connected to the inverter circuit, in order to solve the problem that the system dynamic response of the model predictive control (MPC) was poor when the circuit parameters changed, a method based on ABC threephase coordinates was proposed. This scheme was called advanced MPC with disturbance observer (DOB) (AdMPCDOB). It predicted the controlled current in two steps, and a proportional resonant (PR) regulator was used as the feedforward compensator of the MPC. Compensation could eliminate the periodic error of the predicted current and improve the ability to suppress specific harmonics. Taking into account the influence of circuit parameters and uncertain disturbances on the system, the inductive current DOB was used to accurately observe the MPC input signal. The theoretical analysis and simulation experiments showed that the improved control scheme could effectively improve the output power quality of the inverter and reduce the total harmonic distortion (THD) rate of the gridconnected current.
2019, 46(6):62-65, 83.
Abstract:
Aiming at the development demand of garment industry, the control system of the directdrive discal knife cutter was developed by using brushless DC motor (BLDCM) drive technology to improve the comprehensive performance. The total hardware circuit of the digital controller was composed of the singlechip microcomputer and peripheral circuit, power and drive circuit, Hall position detection circuit, operating circuit and auxiliary power supply. The speed closedloop control strategy and control program were designed according the performance of directdrive BLDCM and the working characteristics of discal knife cutter. The load test experiment proved that the speed regulation performance was accurate and efficient. The blocking test proved that the overcurrent protection during stalling was fast and reliable.
Aiming at the development demand of garment industry, the control system of the directdrive discal knife cutter was developed by using brushless DC motor (BLDCM) drive technology to improve the comprehensive performance. The total hardware circuit of the digital controller was composed of the singlechip microcomputer and peripheral circuit, power and drive circuit, Hall position detection circuit, operating circuit and auxiliary power supply. The speed closedloop control strategy and control program were designed according the performance of directdrive BLDCM and the working characteristics of discal knife cutter. The load test experiment proved that the speed regulation performance was accurate and efficient. The blocking test proved that the overcurrent protection during stalling was fast and reliable.
2019, 46(6):66-71.
Abstract:
In view of the chattering problem which was easily caused by traditional sliding mode control, a fuzzy radial basis function (RBF) neural network sliding mode observer was proposed to realize sensorless control of permanent magnet synchronous motor (PMSM). In order to reduce the chattering of the observer system, the fuzzy RBF neural network algorithm was used to adjust the sliding mode gain dynamically, and the stability of the observer was proved by Lyapunov stability theorem. The phase locked loop (PLL) technology was used to improve the estimation accuracy and reduce the computational noise. A simulation model was built based on the MATLAB/Simulink software platform, and the fuzzy RBF neural network sliding mode observer system was compared with the traditional sliding mode observer system. The results showed that, compared with the traditional sliding mode observer, the new type of sliding mode observer could track the rotor position rapidly and effectively, and accurately estimate the rotor speed, exhibiting good dynamic characteristics.
In view of the chattering problem which was easily caused by traditional sliding mode control, a fuzzy radial basis function (RBF) neural network sliding mode observer was proposed to realize sensorless control of permanent magnet synchronous motor (PMSM). In order to reduce the chattering of the observer system, the fuzzy RBF neural network algorithm was used to adjust the sliding mode gain dynamically, and the stability of the observer was proved by Lyapunov stability theorem. The phase locked loop (PLL) technology was used to improve the estimation accuracy and reduce the computational noise. A simulation model was built based on the MATLAB/Simulink software platform, and the fuzzy RBF neural network sliding mode observer system was compared with the traditional sliding mode observer system. The results showed that, compared with the traditional sliding mode observer, the new type of sliding mode observer could track the rotor position rapidly and effectively, and accurately estimate the rotor speed, exhibiting good dynamic characteristics.
2019, 46(6):72-76, 101.
Abstract:
From the view point of mechatronics, a method to determine the rated voltage of lowpower lowspeed directdrive squirrelcage asynchronous motor (LLDSM) was presented. The relationship among the rated voltage, the maximum torque multiple and the maximum output voltage of variable frequency power supply was researched. The selection principle of pole number and slot number of LLDSM was discussed, and the harmonic content of air gap magnetic field in different poleplot match was simulated and analyzed. Moreover, the prototype of LLDSM was tested, and the relationship curves of motor torque versus current and voltage were measured. The experimental data were studied and analyzed to verify the correctness of the theoretical analysis.
From the view point of mechatronics, a method to determine the rated voltage of lowpower lowspeed directdrive squirrelcage asynchronous motor (LLDSM) was presented. The relationship among the rated voltage, the maximum torque multiple and the maximum output voltage of variable frequency power supply was researched. The selection principle of pole number and slot number of LLDSM was discussed, and the harmonic content of air gap magnetic field in different poleplot match was simulated and analyzed. Moreover, the prototype of LLDSM was tested, and the relationship curves of motor torque versus current and voltage were measured. The experimental data were studied and analyzed to verify the correctness of the theoretical analysis.
2019, 46(6):77-83.
Abstract:
In order to make dual threephase permanent magnet synchronous generator (PMSG) show its characteristics of low inherent voltage regulation, high generating efficiency and low cost, multiobjective optimization design methods were studied considering priority to reduction of inherent voltage regulation. By using analytical method to create fluxlinkage model of unit motor, and taking length of magnetization direction, arc length of permanent magnet and turnsinseries perphase of unit motor as variables, the influences of variables on evaluation indices such as inherent voltage regulation and generator efficiency were analyzed and a multiobjective optimization function with weight coefficients was proposed. Standard genetic algorithm (SGA), differential evolution (DE) and hybrid genetic algorithm (HGA) based on SGA and DE were used to optimize the design parameters, and the optimization results were compared. The results confirmed that HGA optimization results had a good consistency with the design objective, and the output capacity and voltage stabilization of the optimized generator were improved in comparison with the original design.
In order to make dual threephase permanent magnet synchronous generator (PMSG) show its characteristics of low inherent voltage regulation, high generating efficiency and low cost, multiobjective optimization design methods were studied considering priority to reduction of inherent voltage regulation. By using analytical method to create fluxlinkage model of unit motor, and taking length of magnetization direction, arc length of permanent magnet and turnsinseries perphase of unit motor as variables, the influences of variables on evaluation indices such as inherent voltage regulation and generator efficiency were analyzed and a multiobjective optimization function with weight coefficients was proposed. Standard genetic algorithm (SGA), differential evolution (DE) and hybrid genetic algorithm (HGA) based on SGA and DE were used to optimize the design parameters, and the optimization results were compared. The results confirmed that HGA optimization results had a good consistency with the design objective, and the output capacity and voltage stabilization of the optimized generator were improved in comparison with the original design.
2019, 46(6):84-90.
Abstract:
According to the flight profile of the electric aircraft, the system loss of the motor controller was studied, the thermal resistance network model of the IGBT module was established, and the temperature of the IGBT module of the motor controller was calculated. On the premise of meeting the allowable temperature of motor controller, the cooling structure of IGBT module was improved. The results of MATLAB/Simulink simulation and ground bench test showed that the improved aircooled radiator could meet the cooling requirements of electric aircraft motor controller, and the weight of the aircooled radiator was reduced by 5%.
According to the flight profile of the electric aircraft, the system loss of the motor controller was studied, the thermal resistance network model of the IGBT module was established, and the temperature of the IGBT module of the motor controller was calculated. On the premise of meeting the allowable temperature of motor controller, the cooling structure of IGBT module was improved. The results of MATLAB/Simulink simulation and ground bench test showed that the improved aircooled radiator could meet the cooling requirements of electric aircraft motor controller, and the weight of the aircooled radiator was reduced by 5%.
2019, 46(6):91-94.
Abstract:
The design ideas and design characteristics of the vehiclemounted intermediate frequency high speed synchronous generator were elaborated. The test prototype was made according to the design idea and design characteristics. The binding and fixing of magnetic pole coil as well as the internal structure of threephase rotating rectifier were greatly improved in the process of prototype fabrication. Motor performances of the prototype were tested, and the effectiveness of the technical measures to improve the motor performances was verified. This research provided valuable experience for the future design of similar motor.
The design ideas and design characteristics of the vehiclemounted intermediate frequency high speed synchronous generator were elaborated. The test prototype was made according to the design idea and design characteristics. The binding and fixing of magnetic pole coil as well as the internal structure of threephase rotating rectifier were greatly improved in the process of prototype fabrication. Motor performances of the prototype were tested, and the effectiveness of the technical measures to improve the motor performances was verified. This research provided valuable experience for the future design of similar motor.
2019, 46(6):95-101.
Abstract:
Aiming at facilitating the control of two servo motors in the tensiontorsion composite system, a host computer interface based on MFC was designed. Through the serial communication, the corresponding parameters of the servo driver were set by using different button operations to control the operation of two servo motors. The servo driver monitoring data were received by the host computer in real time to draw the speed, displacement and torque curves. For the case where the information frame was received incorrectly during data reception, the method of splicing two adjacent error information frames was used for repair. The results showed that the system function and the monitoring of motor operating conditions could be realized in the host computer interface.
Aiming at facilitating the control of two servo motors in the tensiontorsion composite system, a host computer interface based on MFC was designed. Through the serial communication, the corresponding parameters of the servo driver were set by using different button operations to control the operation of two servo motors. The servo driver monitoring data were received by the host computer in real time to draw the speed, displacement and torque curves. For the case where the information frame was received incorrectly during data reception, the method of splicing two adjacent error information frames was used for repair. The results showed that the system function and the monitoring of motor operating conditions could be realized in the host computer interface.
2019, 46(6):102-105, 111.
Abstract:
Aiming at the shortcomings of the existing motor rotor initial position angle identification method, the mathematical model of permanent magnet synchronous motor (PMSM) was studied, and the mathematical relationship between the rotor position and the inductance of the motor winding was derived. It was proposed to determine the rotor position by using the static inductance value of the threephase winding of the motor, and use the inverter to send the excitation voltage to determine the polarity of the rotor. The rotor prepositioning was not needed during the detection process, and the detection could be realized in mechanical locking or freestop state. The experimental results showed that the method had high detection accuracy and could meet the requirements of vector control of PMSM, which had certain popularization value.
Aiming at the shortcomings of the existing motor rotor initial position angle identification method, the mathematical model of permanent magnet synchronous motor (PMSM) was studied, and the mathematical relationship between the rotor position and the inductance of the motor winding was derived. It was proposed to determine the rotor position by using the static inductance value of the threephase winding of the motor, and use the inverter to send the excitation voltage to determine the polarity of the rotor. The rotor prepositioning was not needed during the detection process, and the detection could be realized in mechanical locking or freestop state. The experimental results showed that the method had high detection accuracy and could meet the requirements of vector control of PMSM, which had certain popularization value.
2019, 46(6):106-111.
Abstract:
Aiming at the problem that the output voltage quality of threephase inverter was easily affected by harmonics when the output side of the threephase inverter was connected with nonlinear load, a voltage control method based on the reducedorder resonant controller (RRSC) was selected. Compared with the resonant controller (RSC), the RRSC could separate the positive and negative order and then deal with them separately. Moreover, the RRSC had less computation and higher efficiency. In order to further reduce the harmonic content of output voltage, the RRSC was further improved and applied to threephase inverter voltage control. Finally, the proposed control method was verified by simulation and compared with the RRSC in detail. The results showed that the proposed control method was effective.
Aiming at the problem that the output voltage quality of threephase inverter was easily affected by harmonics when the output side of the threephase inverter was connected with nonlinear load, a voltage control method based on the reducedorder resonant controller (RRSC) was selected. Compared with the resonant controller (RSC), the RRSC could separate the positive and negative order and then deal with them separately. Moreover, the RRSC had less computation and higher efficiency. In order to further reduce the harmonic content of output voltage, the RRSC was further improved and applied to threephase inverter voltage control. Finally, the proposed control method was verified by simulation and compared with the RRSC in detail. The results showed that the proposed control method was effective.
20 ThreeDimensional Space Vector Pulse Width Modulation Strategy forZSource ThreePhase FourLeg Inverter
2019, 46(6):112-118.
Abstract:
The steadystate operation principle of Zsource threephase fourleg inverter was analyzed, and an improved threedimensional space vector pulse width modulation (3DSVPWM) strategy was proposed. By properly selecting the shootthrough leg, the shootthrough states were inserted into the traditional zerovector state on the premise that the active switching state and output voltage were not affected. At the same time, the coupling relationship between the shootthrough duty ratio and the modulation ratio was analyzed, and the maximum value of the shootthrough duty ratio was obtained. Then the corresponding maximum constant boost strategy was proposed. A simulation model of the Zsource threephase fourleg inverter was built in MATLAB/Simulink and simulated under balanced and unbalanced load conditions. The simulation results showed that the Zsource threephase fourleg inverter could not only achieve boost control under the proposed 3DSVPWM strategy, but also achieve good control results under unbalanced load conditions compared with the traditional Zsource threephase threeleg inverter.
The steadystate operation principle of Zsource threephase fourleg inverter was analyzed, and an improved threedimensional space vector pulse width modulation (3DSVPWM) strategy was proposed. By properly selecting the shootthrough leg, the shootthrough states were inserted into the traditional zerovector state on the premise that the active switching state and output voltage were not affected. At the same time, the coupling relationship between the shootthrough duty ratio and the modulation ratio was analyzed, and the maximum value of the shootthrough duty ratio was obtained. Then the corresponding maximum constant boost strategy was proposed. A simulation model of the Zsource threephase fourleg inverter was built in MATLAB/Simulink and simulated under balanced and unbalanced load conditions. The simulation results showed that the Zsource threephase fourleg inverter could not only achieve boost control under the proposed 3DSVPWM strategy, but also achieve good control results under unbalanced load conditions compared with the traditional Zsource threephase threeleg inverter.
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Electric Machines & Control Application ® 2025
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沪ICP备16038578号-3
Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
