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This paper presents the design considerations of a five-phase outer rotor interior permanent magnet motor (IPM) for an electric bicycle (e-bicycle). Conventional e-bicycles employ three phase outer rotor surface permanent magnet motors which are less reliable compared to the five-phase IPM motors. Moreover, the traditional electric motors use rare-earth permanent magnet materials such as neodymium...
Industrial and academic interest on multiphase electric machines have been steadily increasing due to the advantages they provide compared to their three phase counterparts. They offer higher efficiency and better fault tolerance. The power is distributed across a larger number of machine phases and inverter legs, which allows the use of semiconductor devices with lower ratings. These advantages are...
In stand-alone brushless doubly fed generator (BDFG) based shaft power generation system, the output voltage of BDFG is strong influenced by the filter of load side converter (LSC) because of the coupling caused by the stator power winding leakage inductance. In order to eliminate the harmonic of the voltage, the LC-L filter based on the leakage inductance is put forward in this paper. The relationship...
This paper proposes a combined control strategy for direct matrix converters (DMC) to stabilize the input side filter without any passive damping, simultaneously realizing the field oriented control (FOC) of an induction machine (IM) at the output. The speed control of the FOC with subsidiary torque control is left untouched. The rotor flux control loop is extended to a cascaded structure that additionally...
The Second-Order Generalized Integrator (SOGI) was used as a building block for the SOGI-Quadrature-Signal Generator (SOGI-QSG) which has been widely used for grid synchronization, frequency estimation, and harmonic extraction over the past decade. This paper further investigates its integration and differentiation characteristics, with four new integrators and differentiators proposed. Theoretical...
This paper proposes a sensorless control method for Wound-Rotor Synchronous Starter/Generator (WSSG) in starting process. It is necessary to identify the initial rotor position when uses sensorless control method to start-up AC machines. However, during the process of initial orientation the excitation current of the main generator contains severe pulsating components, which leads to the ineffectiveness...
Model predictive control (MPC) strategy is a typical optimization predictive control method. MPC can achieve satisfying control performance with lower model parameter dependency, and it has been widely applied in process control systems. To improve the system reliability and reduce the hardware cost, extended Kalman filter (EKF) was introduced to achieve sensorless operation. A novel speed sensorless...
Model predictive current control (MPCC) is widely recognized as a high performance control strategy of permanent magnet synchronous machine (PMSM) drives due to its quick response and simple principle. However, conventional MPCC relies heavily on the model of system to predict the future behavior of stator currents for each voltage vector. The one minimizing the current error is selected as the best...
This paper presents an enhanced strategy for Direct Torque Control (DTC) combining artificial intelligent (AI) and predictive algorithms. The advantages of both methodologies are merged to solve the main problems of closed loop controlled induction machines (IM) and, in particular the drawbacks of the classical DTC. Predictive DTC (P-DTC) methods solve the problems of the high torque ripple and poor...
This paper proposes a novel direct power control (DPC) scheme for doubly-fed induction generator (DFIG). Unlike the conventional DPC using hysteresis comparators, the proposed DPC utilizes nonlinear saturation controllers for the voltage vector selection and duty ratio modulation. This makes the calculation of the duty ratios of the voltage vectors much simpler and independent of DFIG parameters....
For doubly fed induction generator (DFIG)-based wind turbine (WT), large electromotive force will be induced in the rotor circuit under grid faults, and the rotor side of DFIG is prone to suffering from overcurrent and overvoltage. To mitigate this problem, an inductance-simulating control strategy is proposed to enhance its low-voltage ride through (LVRT) capability. In this method, the rotor side...
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