三电平逆变器中点电位平衡电路的设计与仿真

Design and Simulation of Novel Circuit for Neutral-Point Voltage Balance in Three-Level Inverter

多电平逆变器在中高压大功率场合得到了广泛的研究和应用 .二极管中点箝位三电平逆变器是一种简单实用的多电平逆变器 ,但是三电平逆变器直流侧中点电位偏移问题影响着逆变器及其电机调速系统的可靠性 .为此提出了一种用于三电平逆变器中点电位平衡的硬件电路 ,详细介绍了其工作原理以及参数设定 ,并用Matlab/Simulink仿真工具对系统进行了研究 ,给出了较好的仿真结果 .

The multilevel inverter has been studied and used widely in high power applications for medium or high voltage.Diode-clamped three-level inverter is a simple and practical kind of inverter.But the deviation of neutral point voltage is one of the key aspects that affects the reliability of the three-level inverter and its electric drive system.This paper presents a novel circuit for neutral-point voltage balance in the three-level inverter.The operation principle and parameters setting are analyzed in detail.Simulation results based on Matlab/Simulink are supplied to confirm the validity of the proposed circuit.