由于共直流母线的开绕组永磁同步电机系统存在零序电流回路，变流器调制产生的共模电压和永磁体自身反电动势零序分量构成的零序电压源会在电机绕组内产生零序电流，影响开绕组永磁同步电机的运行效率和稳定性。因此，提出一种基于比例谐振控制的零序电流抑制方法，在建立开绕组永磁同步电机及其零序回路数学模型基础上，通过设计基于比例谐振控制的零序电流闭环系统来控制变流器输出电压的零序分量，达到对零序电流的抑制目的。同时深入分析了所提零序电流抑制策略在开绕组永磁同步电机不同运行工况下的稳定运行能力。最后，通过构建开绕组永磁同步电机实验系统，验证了所提出零序电流抑制策略的有效性。%Due to the existence of zero sequence circuit when the open winding permanent magnet synchronous motor (PMSM) is supplied by a single DC bus, the common voltage generated by two converters and the triple frequency harmonic component of back EMF would produce zero sequence current. It might deteriorate the efficiency and operation stability of open winding PMSM. In order to solve this problem, a zero sequence current suppression strategy based on a proportional-resonant (PR) controller was proposed with one common DC bus in this paper. According to the mathematical model of the open winding PMSM and its zero sequence circuit, a closed-loop system with PR controller was designed to regulate the common voltage produced by the converters so as to suppress the zero sequence current. The stable operation capabilities of the proposed strategy on the different operation conditions were analyzed. Finally, the experimental system of open winding PMSM system was developed to validate the proposed zero sequence current suppression strategy.
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