对称型多相电机断相容错运行下的电流谐波分析与补偿  

Analysis and Compensation of Current Harmonics in Symmetrical Multiphase Machines in Fault-Tolerant Operation against Open-Phase Faults

作　　者：孙嘉伟 郑泽东[1] 李驰 王奎[1] 李永东[1] Sun Jiawei;Zheng;Zedong;Li Chi;Wang Kui;Li Yongdong(State Key Lab of Control and Simulation of Power System and Generation Equipment Tsinghua University,Beijing 100084 China)

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学),北京100084

出　　处：《电工技术学报》2022年第21期5424-5434,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金山东联合基金资助(项目名称:大容量高性能多相永磁直驱电力推进系统关键科学问题研究项目编号:U2016217)。

摘　　要：多相电机驱动系统可靠性高、容错能力强、控制灵活。该文对断相容错运行下,多相电机中低频奇数次电流谐波的特性和补偿方法进行了研究。利用广义Clarke变换,可将电机定子电流变换到各个子空间当中。研究发现,断相容错时,各次谐波电流以正负序分量同时存在的形式分布在所有子空间当中。传统谐波补偿方法只在特定子空间下进行补偿,在断相容错工况下性能有较大恶化。该文提出一种改进电流谐波补偿方法,利用广义对称分量变换和正负序PI控制器实现各子空间内正负序谐波电流补偿,保证了断相容错时良好的补偿效果。在九相感应电机平台上对提出方法进行验证,实现了断相容错时对选定电流谐波的完全补偿,并降低了谐波带来的额外损耗和转矩脉动。Multiphase machines have the advantages of high reliability,high fault-tolerant ability and high control flexibility.This paper studies the characteristics and compensation of low order current harmonics in multiphase machines during open-phase fault-tolerant operation.For a specific order current harmonic,positive and negative sequence components exist at the same time in all the subspaces in open-phase fault-tolerant operation.Traditional current harmonic compensation methods only compensate the selected order current harmonic in a specific subspace,therefore have seriously degraded performance in fault-tolerant operation.This paper proposes an improved current harmonic compensation method.With the Generalized Symmetrical Components Transformation and double PI controllers,positive and negative sequence current harmonics can be compensated in all the subspaces,which guarantees the good compensation performance in fault-tolerant operation.Finally,experiments were done on a nine-phase induction machine to verify the effectiveness of the proposed method and experimental results show the selected current harmonics can be completely compensated.Additional losses and torque ripple caused by current harmonics are reduced.

关 键 词：多相电机 断相故障 容错控制 电流控制 谐波补偿 

分 类 号：TM301.2[电气工程—电机]