Zheng Zedong

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This paper proposed a state observer based on extended Kalman Alter (EKF) for the rotor speed and load torque observation of permanent magnet synchronous motor (PMSM). This observer can be used to estimate the precise rotor position and rotor speed in the servo systems with only optical encoder of limited accuracy. By using the observed rotor speed and(More)
The AC-AC converters (such as matrix converter) gains increasingly attention in recent years due to their merit in compact design, regeneration capability and no large energy store elements. These advantages make the matrix converter attractive in industrial applications. The multilevel topologies are advantages in high voltage, large volume, high power(More)
This paper proposed a novel flux weakening scheme based on model predictive control (MPC) for induction motor applied in electric wheel. This control method is implemented based on the voltage control strategy, where model predictive control (MPC) algorithm other than traditional PI regulators is adopted to adjust the flux current component. Experimental(More)
A load torque observer based on Kalman filter is proposed which can observe the load torque, rotor speed and position of permanent magnet synchronous motors (PMSM) with only very low accuracy mechanical position sensor. With the observed rotor position and speed instead of the values measured directly from mechanical sensor, control performance can be(More)
A novel hybrid cascade H-bridge converter is presented in which cascaded H-bridge cells and one three-phase two-level converter with a flying capacitor are connected together. The output voltage will be increased while the number of isolated DC bus can be reduced. PWM control method and flying capacitor voltage balancing algorithm are analyzed. Simulation(More)
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