PMSM Sensorless Vector Control System Based on Single Shunt Current Sensing
To reduce the cost and volume of permanent magnet synchronous motor (PMSM) drive system fed by pulse width modulation (PWM) inverter, this paper presents a single shunt current sensing with rotor-position sensorless control method of PMSM vector control s
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Abstract To reduce the cost and volume of permanent magnet synchronous motor (PMSM) drive system fed by pulse width modulation (PWM) inverter, this paper presents a single shunt current sensing with rotor-position sensorless control method of PMSM vector control system. The reference voltage of space vector pulse width modulation (SVPWM) inverter is researched to implement the requirements by AC-link phase current reconstruction with single shunt current sensing. By model reference adaptive system (MRAS), speed estimation method is investigated to satisfy rotor-position sensorless control. Simulations are tested on a PMSM vector control system fed by SVPWM inverter. Simulation results demonstrate the feasibleness and the effectiveness of the single shunt current sensing with MRAS sensorless control method. Keywords Single shunt current sensing • MRAS sensorless • PMSM • PWM inverter
1 Introduction For permanent magnet synchronous motor (PMSM) having many advantages such as high ratio of torque to weight and high efficiency, PMSM vector control systems, which supplied by pulse width modulation voltage source inverters (PWM-VSI), are widely used in many applications [1]. High performances PMSM vector control systems depended on the precise information of AC-link currents by AC-link current sensors and the rotor position by mechanical sensor. To reduce the cost and volume of inverter, no current sensors control methods based on a single shunt current sensing to reconstruct three phase AC currents have been proposed by H. Ma (*) Department of Electrical Engineering, Beijing University of Civil Engineering and Architecture, Beijing, China e-mail: [email protected] W. Wang (ed.), Mechatronics and Automatic Control Systems, Lecture Notes in Electrical Engineering 237, DOI 10.1007/978-3-319-01273-5_81, © Springer International Publishing Switzerland 2014
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researchers [2–4]. The sensorless rotor-position estimation methods like the Extended Kalman Filter (EKF) algorithm combining with single shunt sensing and the model reference adaptive method combining with no AC-link current sensor have been developed [5, 6]. In sensorless AC drive systems, the practical rotor position/speed estimation method is based on model reference adaptive system (MRAS). In this paper, single shunt current sensing with the MRAS sensorless method is researched in PMSM vector control systems supplied by space vector PWM voltage source inverter (SVPVM-VSI). The validity and feasibility of the researched method are verified by simulation results of PMSM vector control systems supplied by three phase voltage source inverter.
2 Single Shunt Current Reconstruction Based on DC-Link Single shunt current sensing control scheme is reconstructed the AC-link currents by the measured DC-link current values with single shunt. The voltage vector diagram of SVPWM-VSI shown as Fig. 1, there are six sectors in the voltage vector diagram of SVPWM and six active voltage vectors (V1 ~ V6) and two zero vectors V0 (000) and V7 (111). The reference voltage
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