Improved sliding mode observer for FOC control system with discontinuous PWM of sensorless PMSM
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With the increasing number of electric cars worldwide, permanent-magnet synchronous motors (PMSMs) are becoming increasingly popular in the transportation industry. In parallel with the development of PMSM, many novel control strategies have been developed to make PMSM superior and robust. In all control strategies aimed at improving the operation of PMSMs, the control strategy using discontinuous pulse width modulation (DPWM) instead of continuous space vector pulse width modulation (CSVPWM) for field-oriented control (FOC) is widely used to reduce switching and save energy. However, this method has not been applied by researchers to sensorless PMSM control three-phase inverters. Therefore, this study investigated a sensorless PMSM control with a DPWM FOC and a traditional sliding-mode observer to estimate rotor positions. Additionally, a modified sliding-mode observer with a Park phase-locked loop (PLL) was designed experimentally to improve the stability of the PMSM speed and reduce harmonics in the output phase current for the inverter under the FOC with DPWM. The experimental results verified that the sliding-mode observer integrated with the Park PLL can improve the operation of the sensorless PMSMs under FOC with DPWM.
Abstract
With the increasing number of electric cars worldwide, permanent-magnet synchronous motors (PMSMs) are becoming increasingly popular in the transportation industry. In parallel with the development of PMSM, many novel control strategies have been developed to make PMSM superior and robust. In all control strategies aimed at improving the operation of PMSMs, the control strategy using discontinuous pulse width modulation (DPWM) instead of continuous space vector pulse width modulation (CSVPWM) for field-oriented control (FOC) is widely used to reduce switching and save energy. However, this method has not been applied by researchers to sensorless PMSM control three-phase inverters. Therefore, this study investigated a sensorless PMSM control with a DPWM FOC and a traditional sliding-mode observer to estimate rotor positions. Additionally, a modified sliding-mode observer with a Park phase-locked loop (PLL) was designed experimentally to improve the stability of the PMSM speed and reduce harmonics in the output phase current for the inverter under the FOC with DPWM. The experimental results verified that the sliding-mode observer integrated with the Park PLL can improve the operation of the sensorless PMSMs under FOC with DPWM.
참고문헌 (17)
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