基于开绕组电机的电动汽车双电池集成充电系统准直接功率控制

doi:10.19595/j.cnki.1000-6753.tces.230426

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Abstract

Recently, the charging of electric vehicles (EVs) has mainly relied on DC charging piles, which have the problems of large space occupation and high construction cost. Thus, the scholars have proposed several approaches of integrated battery charger (IBC) based on the reconfiguration relays or switches, the driving system with power converters and phase windings of electric machine could be reused as the charger when the EV is in the standstill status. However, the traditional structure of the phase windings of the electric machine needs more switches to achieve the reconfiguration topology, while the specific open-winding PMSMs (OW-PMSMs) could be a good candidate for the IBC of EVs due to the properties of high output power, fault tolerance and other characteristics. In this paper, the IBC topology and control strategy based on OW-PMSM with the dual battery packs are proposed for EVs with the new energy power. The three-phase grid power are connected to the neutral points of the three-phase windings of OW-PMSM, and the dual battery packs can be charged simultaneously. When the residual power of the dual battery packs is unequal, their equivalent loads are different and the charging power of them are imbalanced, then in the charging mode, the unequal currents flowing in the phase windings of OW-PMSM will lead to the output torque, and it will have side effect on the proposed IBC system. Therefore, a quasi-direct power control (QDPC) strategy is designed to suppress the torque pulsation caused by the imbalanced charging power of the dual channel.
Firstly, mathematical model of the dual-battery integrated charging system based on OW-PMSM is carried out, and the grid coordinate system and the motor coordinate system are unified to simplify the expression of the electromagnetic torque of the motor during the charging mode. Then, in order to achieve the output torque elimination 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, as the basic strategy is performed in the rotated coordinate system, the phase-locked loop (PLL) and decoupling of the dq-axis voltage should be employed herein, it may consume a lot of computing resources and has side effect on the dynamic performance of the proposed system. Thus, the QDPC strategy is derived and designed to obtain theαβ-axis current control directly in the rotating coordinate system to achieve high dynamic performance. The corresponding parameters in the dual-loop of current and voltage are also designed in detail.
Finally, the simulation and experiment results are implemented, it can be seen that the output torque could be eliminated for the proposed IBC system with the imbalanced equivalent loads. The steady-state experiments are conducted at load ratios of 0.75, 1, and 1.5, and the dynamic experiments are also divided into different cases of variable loads and variable voltages condition. 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 could be reduced to be 60% compared to that with the basic control strategy. It can be seen that the proposed QDPC strategy for the proposed OW-PMSM for EVs could achieve a better dynamic performance.

Key words： integrated dual-battery charging topology open-winding permanent magnet synchronous motor dual batteries quasi-direct power control

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TM351

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	Guo Lei
	Wei Jiadan
	Wang Yiwei
	Zhou Bo
	Wang Yin

Cite this article:

Guo Lei,Wei Jiadan,Wang Yiwei等. Quasi-direct power control of dual-battery electric vehicle integrated charging system based on an open-winding motor[J]. Transactions of China Electrotechnical Society, 0, (): 9022-22.

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