Abstract
Aiming at the problem of large magnitude and high frequency of common-mode voltage (CMV) when space vector pulse width modulation (SVPWM) is used in a three-phase motor fed by a two-level voltage source inverter, a common-mode reduction SVPWM (CMRSVPWM) is studied. In this method, six new sectors are obtained by rotating six sectors of conventional SVPWM by 30°. In odd-numbered sectors, only three non-zero vectors with odd subscripts are used for synthesis, while in even-numbered sectors, only three non-zero vectors with even subscripts are used for synthesis. The actuation durations of three non-zero vectors in each switching period in each sector are given. Simulation and experimental results show that, compared with the conventional SVPWM, the CMV magnitude of CMRSVPWM is reduced by 66.67% and the CMV frequency of CMRSVPWM is reduced from the original switching frequency to the triple fundamental frequency. At the same time, the current, torque and speed of the motor are still good.
Highlights
It is well known that the use of AC drives can achieve high efficiency and energy saving [1].In AC drives, a three-phase motor fed by a two-level voltage source inverter has found widespread application [2]
In order to verify the correctness and validity of the CMRSVPWM, we perform simulations and experiments using the CMRSVPWM and the conventional space vector pulse width modulation (PWM) (SVPWM) and compare their results, taking a three-phase cage induction motor fed by a two-level voltage source inverter as the object
The simulation results above show that the CMRSVPWM can effectively reduce the magnitude and frequency of common-mode voltage (CMV), while while other performance indexes have not declined, which is basically the same as the conventional SVPWM
Summary
It is well known that the use of AC drives can achieve high efficiency and energy saving [1]. In this method, null vectors are no longer used, but some equivalent null a previous paperinstead [16] is of the “near state PWM (NSPWM)”. The feature of the that three non-zero vectors closest to a reference vector are used for synthesis, and the synthetic result method that four non-zero vectors closest reference used for (VSVM)”. The feature of the method is that four non-zero vectors closest to the reference vector close to the switching frequency of the inverter. Aiming at the shortcomings of the above methods, this paper studies to the common-mode resonance frequency of the system, the corresponding common-mode currenta common-mode reduction (CMRSVPWM), which can reduce the magnitude, will be significantly amplified, which is dangerous for system reliability. The correctness and validity of the method are verified by simulations and experiments
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