Modulation and Voltage Balancing Control of Dual Five-level ANPC Inverter for Ship Electric Propulsion Systems  

作　　者：Xiaohui Xu Xingchi Song Kui Wang Nianzhou Liu Wenfeng Long Zedong Zheng Yongdong Li 

机构地区：[1]Science and Technology on Ship Integrated Power System Technology Laboratory,Wuhan Institute of Marine Electric Propulsion,Wuhan 430070,China [2]China State Key Laboratory of Power System,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Journal of Electrical Engineering》2021年第4期78-92,共15页中国电气工程学报（英文）

摘　　要：Open-end winding motors are used extensively in ship electric propulsion systems,in which medium-voltage high-power inverters are a critical component.To increase the system voltage and power density,a dual five-level active neutral-point clamped(ANPC)inverter is proposed herein to drive medium-voltage open-end winding motors for ship electric propulsion.Each phase of this inverter comprises two five-level ANPC bridges and all the phases are powered by a common direct-current link.A hybrid modulation method is proposed to control this inverter.The series-connected switches in all the five-level ANPC bridges are operated at the fundamental frequency,and the other switches are controlled with a phase-shifted pulse-width modulation(PWM),which can achieve a natural balance between the neutral-point voltage and flying capacitor voltages in a carrier period.A closed-loop capacitor voltage balancing method based on adjusting the duty ratios of the PWM signals is proposed.The neutral-point voltage and flying capacitor voltages can be controlled independently and balanced without affecting the output phase voltage.Simulation and experimental results are presented to demonstrate the validity of this method.

关 键 词：Multilevel inverter active neutral-point clamped(ANPC) capacitor voltage balance open-end winding motor drive 

分 类 号：U66[交通运输工程—船舶及航道工程]