Abstract：Active neutral-point-clamped five-level (ANPC-5L) is a new topology suitable for medium and high voltage variable frequency drives. The existing floating capacitor pre-charging methods of ANPC-5L inverter are simple and reliable, and do not need external pre-charging circuits. However, there are also shortcomings such as excessive voltage stress on the switch component and forcing complementary switch component pass-through. Therefore, a floating capacitor pre-charging control strategy is proposed. By setting pre-charging resistors on the AC side, the proposed control strategy can charge DC-link capacitors and floating capacitors simultaneously, which can ensure that the neutral point potential of DC-link capacitors is half of the DC-link voltage and floating capacitor voltage is one fourth of the DC-link voltage during the pre-charging process. The equivalent circuits in pre-charging process are analyzed, the time-domain expressions of capacitor voltage are derived and the theoretical basis for parameter design of the pre-charging circuit is obtained. The proposed pre-charging control strategy is verified by circuit simulation. Meanwhile, experimental verification of the proposed strategy is conducted on a 100kW ANPC-5L inverter prototype.
李科峰, 高山, 刘计龙, 肖飞, 麦志勤. 有源中点钳位五电平逆变器悬浮电容预充电控制策略[J]. 电工技术学报, 2022, 37(8): 2064-2075.
Li Kefeng, Gao Shan, Liu Jilong, Xiao Fei, Mai Zhiqin. Floating Capacitor Pre-Charging Control Strategy for Five-Level Active Neutral-Point-Clamped Inverter. Transactions of China Electrotechnical Society, 2022, 37(8): 2064-2075.
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