Abstract
This paper proposes a novel state estimation based permanent magnet synchronous motor (PMSM) control method for electric vehicle (EV) driving. Firstly, a state feedback decoupling control with disturbance feed-forward (SFDCDF) is described. As motor angular speed and rotary angle are key information for the proposed control algorithm and park’s transformation, a novel observer based angular speed estimator (OBASE) is proposed for angular speed estimation. Moreover, an extended Kalman filter (EKF) based rotary angle estimator (EBRAE) is used for rotary angle estimation with information of the estimated angular speed. The convergence of angular speed estimation is proven through Lyapunov stability theory. Simulation results also indicate that the proposed algorithms can control PMSM torque, current, and angular speed to accurately follow reference values without severe fluctuation. In addition, in order to provide SFDCDF with load torque information, the OBASE is slightly modified to work as a vehicle load estimator (VLE) so PMSM responds more rapidly and speed fluctuates more slightly when the load suddenly changes. Then a series of hardware in the loop (HIL) simulations are carried out. Results indicate that the proposed control strategy can precisely estimate PMSM’s angular speed and rotor angle. Also, it can improve the driving performance of PMSM used on EVs.
Highlights
Permanent magnet synchronous motor (PMSM) is widely used in various areas
Light weight, high efficiency, high power factor, fast response, wide speed range, and good accuracy make it replace DC motor to be broadly used in electric vehicles (EV) including pure electric vehicles (PEV) as well as hybrid electric vehicles (HEV)
This paper proposes a series of algorithms to estimate parameters, to observe states, and to control PMSM to drive EVs
Summary
Light weight, high efficiency, high power factor, fast response, wide speed range, and good accuracy make it replace DC motor to be broadly used in electric vehicles (EV) including pure electric vehicles (PEV) as well as hybrid electric vehicles (HEV). Few of them focuses on applications on EVs. EVs usually possess characteristics of large range of and high changing frequency of speed and load torque. In some active safety systems, such as antilock braking system (ABS), traction control system (TCS), and electric stability program (ESP), accurate speed control is required.[1] Sun and Mills,[2] focuses only on high-speed system. Sivaprakasam and Manigandan[5] focuses on low load torque (maximum 5 N m) system. Shah et al.[6] assumes the load torque as constant value
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