电动汽车用新型多相永磁电驱重构型车载充电系统研究

Aiming at realizing technical and economic performance and high reliability in the electric vehicles, we will develop a new multiphase permanent magnet electric-drive-reconstructed onboard charger (EDROC) system, inherently possessing the merits of high power density, high reliability, which will be a desired solution for the increasing capacity, fast charging and high reliability demand in the onboard chargers. The research aspects include the work principle of the EDROC system, electromagnetic characteristics such as loss, inductance, and electromagnetic torque in the permanent magnet motor during the charging process, grid-side modular parallel technology and fault tolerant control. Focused on the following key techniques: 1) Explore the fully-decoupled transformation matrix to deal with the charging torque problem; 2) Built the mathematical model to determine zero-sequence circulating current due to parameter asymmetry or control nonlinearity among paralleling modules; 3) Investigate control degree of freedom in the EDROC system, and the torque-producing current in the fundamental plane under the phase-loss operation; 4) Implement a digital drive and control experimental platform based on DSP28335; 5) Build a 22kW laboratory prototype, which is capable of unity power factor operation, low current harmonic and fault-tolerant operation; 6) Provide technical basis for further study. Finally, the success of this project will supply theoretical and practical value in the electric vehicles.

针对电动汽车车载充电系统容量不断增大、快速充电及可靠性要求越来越高等新要求，以提高车载充电系统技术经济性能和可靠性为目标，提出并研究一种具有大功率及高可靠性特征的电动汽车用多相永磁电驱重构型车载充电（EDROC）系统。本项目主要研究该EDROC系统工作原理，充电过程中绕组通电对永磁电机损耗、电感及电磁转矩等电磁特性的影响、网侧模块并联控制及容错控制等基础问题。将用矢量空间解耦的研究方法，拟解决充电转矩的问题；建立因硬件参数不匹配及控制效果不同产生零序环流的数学模型；深入探讨EDROC系统的控制自由度，以及缺相运行时基波转矩电流分量等关键问题；构建以DSP28335为核心的硬件控制平台，优化系统控制策略与算法；根据QC/T895-2011研制一套22kW实验样机，使具备单位功率因数充电、谐波含量低及可靠性高等技术特征，进而为电动汽车大功率车载充电系统的发展提供理论基础和技术支持。

针对电动汽车车载充电系统容量不断增大、快速充电及可靠性要求越来越高等新要求，以提高车载充电系统技术经济性能和可靠性为目标，提出并研究一类具有大功率及高可靠性特征的电动汽车用多相永磁电驱重构型车载充电（EDROC）系统。本项目主要研究了该类EDROC系统的工作原理，充电过程中绕组通电对永磁电机损耗、电感及电磁转矩等电磁特性的影响、网侧模块并联控制及容错控制等基础问题。分析了现有EDROC系统，总结了设计原则与规律，提出了多种EDROC系统拓扑结构；利用有限元仿真软件研究了EDROC系统充电工况下电机内部磁场分布情况，研究了转子位置对电感与电磁转矩的影响；针对并联系统存在的环流问题，提出了三种环流抑制策略；从控制自由度的角度出发，将多相电驱的容错控制拓展至充电模式，研究了绕组开路故障条件下的容错控制策略；构建了多套小功率实验平台与样机，用于验证理论分析的正确性；根据QC/T895-2011研制了一套22kW工程样机，具备单位功率因数充电、谐波含量低及可靠性高等技术特征，进而为电动汽车大功率车载充电系统的发展提供理论基础和技术支持。