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| Quasi-Direct Power Control of Dual-Battery Electric Vehicle Integrated Charging System Based on an Open-Winding Motor |
| Guo Lei1, Wei Jiadan1, Wang Yiwei1, Zhou Bo1, Wang Yin2 |
1. Center for More-Electric-Aircraft Power System Nanjing University of Aeronautics and Astronautics Nanjing 211106 China;
2. Ningbo Healthkey Linear Motion Technology Co. Ltd Ningbo 315300 China |
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Abstract Recently, electric vehicle (EVs) charging has mainly relied on DC charging piles, facing challenges such as large space occupation and high construction costs. Scholars have proposed several integrated battery chargers (IBC) based on reconfiguration relays or switches. The driving system with power converters and phase windings of the electric machine can be reused as the charger when the EV is in the standstill status. However, traditional structures of the phase windings require additional switches for reconfiguration topology. The specific open-winding PMSMs (OW-PMSMs) emerge as promising candidates for IBCs due to their high output power, fault tolerance, and other characteristics. This paper proposes an IBC topology and control strategy based on OW-PMSM with dual battery packs for EVs with new energy power. The three-phase grid power is connected to the neutral points of the three-phase windings of OW-PMSMs, enabling simultaneous charging of dual battery packs. When the residual power of dual battery packs is unequal, their equivalent loads are different, and the charging power are imbalanced. Accordingly, in the charging mode, imbalanced currents flowing in the phase windings of OW-PMSM can lead to the output torque, which has a side effect on the proposed IBC system. Therefore, a quasi-direct power control (QDPC) strategy is designed to suppress the torque pulsation.
Firstly, a mathematical model for the dual-battery integrated charging system based on OW-PMSM is carried out. The grid and motor coordinate systems are unified to simplify the electromagnetic torque expression during the charging mode. Then, to eliminate the output torque of the proposed system in the charging mode when the dual channel charging power is equal, a basic control strategy for the balanced charging power is designed. However, the phase-locked loop (PLL) and decoupling of the dq-axis voltage may consume a lot of computing resources and affect the dynamic performance of the proposed system. Thus, the QDPC strategy is derived and designed to obtain the αβ-axis current control directly in the rotating coordinate system. The corresponding parameters in the dual-loop of current and voltage are also designed in detail.
Simulation and experimental results demonstrate that the output torque for the proposed IBC system with imbalanced equivalent loads can be eliminated. Steady-state experiments are conducted at load ratios of 0.75, 1, and 1.5, and dynamic experiments are conducted under variable loads and voltages. With the proposed QDPC strategy, the steady-state charging torque is less than 1.15 N·m under different load ratios, and the dynamic charging torque is less than 1.21 N·m under variable loads and voltages. Moreover, the dynamic charging torque of the proposed system is reduced by 60% compared to the basic control strategy. The proposed QDPC strategy for the proposed OW-PMSM improves dynamic performance.
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Received: 06 April 2023
Published: 07 June 2024
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2024, Vol. 39 
