Overmodulation is frequently required during the transient interval at high speed operations of IPMSMs （interior permanent magnet synchronous motors）. In this work, an overmodulation method is developed in the synch...Overmodulation is frequently required during the transient interval at high speed operations of IPMSMs （interior permanent magnet synchronous motors）. In this work, an overmodulation method is developed in the synchronous reference frame with a provision of assigning different priorities to d- and q-axes currents. During the current boosting in motoring, the d-axis current is increased by priority for a fast current response, and to minimize the overmodulation period. However in the regeneration process, the q-axis current is decreased by priority during a load reduction. Simulation and experimental results show that the proposed method, compared with the existing minimum-phase error method, is better for a fast current response, and in shortening the overmodulation period.展开更多
Three-level Neutral-Point-Clamped(NPC)voltage source inverters(VSIs)have been widely used in application of medium-voltage high-power induction motor drives.Due to the limitation of a switching frequency of several hu...Three-level Neutral-Point-Clamped(NPC)voltage source inverters(VSIs)have been widely used in application of medium-voltage high-power induction motor drives.Due to the limitation of a switching frequency of several hundred Hz in the high-power drive application,a 4-segment synchronized SVPWM scheme is adopted to reduce output current ripple.However,in the overmodulation region,the 4-segment synchronized SVPWM scheme shows high computation complexity and high current THD.Thus,this paper presents an optimized 4-segment synchronized overmodulation scheme with the advantages of low current harmonics and simple digital realization.Optimized and conventional 4-segment synchronized SVPWM schemes are compared and verified in experimental tests.Experimental results prove the proposed scheme can achieve lower current harmonics and computational burden in the overmodulation region,compared with traditional schemes.展开更多
Due to high power density,high efficiency,and accurate control performance,permanent magnet synchronous motors(PMSMs)have been widely adopted in equipment manufacturing and energy transformation fields.To expand the s...Due to high power density,high efficiency,and accurate control performance,permanent magnet synchronous motors(PMSMs)have been widely adopted in equipment manufacturing and energy transformation fields.To expand the speed range under finite DC-bus voltage,extensive research on field weakening(FW)control strategies has been conducted.This paper summarizes the major FW control strategies of PMSMs,which are categorized into calculation-based methods,voltage closed-loop control methods,and model predictive control related methods.The existing strategies are analyzed and compared according to performance,robustness,and execution difficulty,which can facilitate the implementation of FW control.展开更多
文摘Overmodulation is frequently required during the transient interval at high speed operations of IPMSMs （interior permanent magnet synchronous motors）. In this work, an overmodulation method is developed in the synchronous reference frame with a provision of assigning different priorities to d- and q-axes currents. During the current boosting in motoring, the d-axis current is increased by priority for a fast current response, and to minimize the overmodulation period. However in the regeneration process, the q-axis current is decreased by priority during a load reduction. Simulation and experimental results show that the proposed method, compared with the existing minimum-phase error method, is better for a fast current response, and in shortening the overmodulation period.
文摘Three-level Neutral-Point-Clamped(NPC)voltage source inverters(VSIs)have been widely used in application of medium-voltage high-power induction motor drives.Due to the limitation of a switching frequency of several hundred Hz in the high-power drive application,a 4-segment synchronized SVPWM scheme is adopted to reduce output current ripple.However,in the overmodulation region,the 4-segment synchronized SVPWM scheme shows high computation complexity and high current THD.Thus,this paper presents an optimized 4-segment synchronized overmodulation scheme with the advantages of low current harmonics and simple digital realization.Optimized and conventional 4-segment synchronized SVPWM schemes are compared and verified in experimental tests.Experimental results prove the proposed scheme can achieve lower current harmonics and computational burden in the overmodulation region,compared with traditional schemes.
基金supported by the Research Fund for the National Natural Science Foundation of China(52125701).
文摘Due to high power density,high efficiency,and accurate control performance,permanent magnet synchronous motors(PMSMs)have been widely adopted in equipment manufacturing and energy transformation fields.To expand the speed range under finite DC-bus voltage,extensive research on field weakening(FW)control strategies has been conducted.This paper summarizes the major FW control strategies of PMSMs,which are categorized into calculation-based methods,voltage closed-loop control methods,and model predictive control related methods.The existing strategies are analyzed and compared according to performance,robustness,and execution difficulty,which can facilitate the implementation of FW control.
