文档介绍：
多逆变器并联型永磁同步电机系统优化控
制策略研究#
郑杨,王政**
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(东南大学电气工程学院,南京 201196)
摘要:在大功率电机调速系统中,常需要并联逆变器来增加系统容量。并联逆变器馈电电机
调速系统同时具有容错性强、等效开关频率高和功率易扩展的优点。但由于实际系统中各逆
变器模块开关器件动作不一致和电路参数存在差异,系统会遇到并联逆变器模块间环流问
题。如何协调控制不同并联逆变器模块实现电机总电流波形优化、并有效抑制并联逆变器模
块间环流是系统高性能运行的关键。为解决该问题,本文研究分析了并联逆变器馈电永磁同
步电机(PMSM)调速系统的电路结构及并联逆变器环流的等效电路模型,结合移相空间矢量
脉宽调制(SVPWM)技术和随机开关频率 SVPWM 技术,提出了针对并联逆变器馈电 PMSM
调速系统的随机移相 PWM 策略,可有效减小电机电流中的谐波。本文还通过在 SVPWM 中
动态分配零矢量作用时间来抑制各逆变器模块间的环流。论文通过实验验证了所提出的控制
策略的有效性。
关键词:并联逆变器;电机调速系统;谐波;环流;空间矢量脉宽调制
Improved Control Strategy for Paralleled Inverters Based
Permanent Synchronous Machine System
ZHENG Yang, WANG Zheng
(School of Electrical Engineering, Southeast University, Nanjing 210096)
Abstract: The power inverters are usually connected in parallel to increase system capacity for
high-power motor drive systems. Paralleled inverters fed motor drive system has various
advantages such as high fault tolerance capability, high equivalent switching frequency and easy
extension in the system power rating. Due to the difference in device switching instants and
system parameters, the circulating current will be induced between the paralleled inverters. Thus,
it es a challenging issue to optimize the motor current waveforms by collaborating
operation of paralleled inverters while avoiding the possible circulating current. To mitigate this
problem, the system configuration and equivalent model of the paralleled inverters fed permanent
synchronous motor (PMSM) drive system have been analyzed in this paper. Based on that,
a phase shifted space vector pulse width modulation (SVPWM) scheme and a random SVPWM
bined to suppress the harmonics in motor current. An additional control loop is also
designed to suppress the possible circulating current by tuning the dwelling time of zero vectors
dynamically. Experimental results have been given to validate the effectiveness of the proposed
control strategies.
Key words: Paralleled inverters; motor d