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| Analysis and Compensation of Current Harmonics in Symmetrical Multiphase Machines in Fault-Tolerant Operation against Open-Phase Faults |
| 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 |
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Abstract 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.
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Received: 11 August 2021
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2022, Vol. 37 
