有源中点钳位五电平逆变器悬浮电容预充电控制策略  

Floating Capacitor Pre-Charging Control Strategy for Five-Level Active Neutral-Point-Clamped Inverter

作　　者：李科峰 高山 刘计龙[1] 肖飞[1] 麦志勤[1] Li Kefeng;Gao Shan;Liu Jilong;Xiao Fei;Mai Zhiqin(National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering,Wuhan 430033 China)

机构地区：[1]海军工程大学舰船综合电力技术国防科技重点实验室,武汉430033

出　　处：《电工技术学报》2022年第8期2064-2075,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51807200);国防科技卓越青年科学基金(2018-JCJQ-ZQ-002)资助项目。

摘　　要：有源中点钳位五电平(ANPC-5L)拓扑是一种适用于中高压变频驱动的新型拓扑结构。现有ANPC-5L逆变器悬浮电容预充电方法具有简单可靠、不需要外部充电电路等优势,但也存在开关管电压应力过大、强制互补的开关管直通等不足。针对此问题,该文提出一种悬浮电容预充电控制策略,通过在交流侧布置预充电电阻,即可实现直流侧支撑电容和桥臂内悬浮电容同时预充电,预充电过程中既可以确保支撑电容中点电位为母线电压的一半,也可以确保各桥臂悬浮电容电压为母线电压的四分之一。该文分析预充电过程的等效电路,推导预充电过程中电容电压的时域解析表达式,得出预充电电路参数设计的理论依据。通过电路仿真,对所提预充电控制策略进行了验证,同时在一台功率等级为100kW的ANPC-5L逆变器样机上对所提控制策略进行了实验验证。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.

关 键 词：有源中点钳位 五电平 悬浮电容 预充电 电容电压控制 

分 类 号：TM464[电气工程—电器]