用于大功率电流源型永磁同步电机系统LC谐振抑制的动态电容电压控制策略.docVIP

  用于大功率电流源型永磁同步电机系统 LC 谐振抑制的动态电容电压控制策略# 王政，樊英* 5 10 15 20 25 30 35 40 （东南大学电气工程学院，南京 210096） 摘要：本文提出了一种动态电容电压控制策略，可用于大功率电流源型永磁同步电机(PMSM) 驱动系统的谐振抑制。其关键是采用闭环控制方法使得电容电压动态地跟踪基波电压参考 值。其中一个控制带宽较窄的闭环定子电流控制器提供了电压环的基波参考值，并且也实现 了电流调节。因此本文所提出的动态电容电压控制方法具有如下优点：首先，当变换器输出 电流的低次谐波和 LC 网络谐振频率相近时，该控制方法可以有效抑制 LC 振荡；其次，当 电机系统中发生暂态干扰时，动态电容电压控制方法可以很好地抑制暂态 LC 谐振；再次， 该方法可以保证定子电流得到准确控制，对系统参数自适应能力强。本文通过搭建实验室样 机对所提出的电容电压控制策略进行了实验验证。 关键词：电机驱动系统；电流源型逆变器；大功率电机驱动；动态电容电压控制；LC 谐振 中图分类号：请查阅《中国图书馆分类法》 Dynamic Capacitor Voltage Control for LC Resonance Suppression in High Power CSI Fed PMSM Drives WANG Zheng, FAN Ying (School of Electrical Engineering, Southeast University, Nanjing 210096) Abstract: A dynamic capacitor voltage control (DVC) is newly proposed to suppress the harmonics in the high power current source inverter (CSI) fed permanent magnet synchronous motor (PMSM) drives. The key is to force the capacitor voltage to follow the fundamental voltage reference by using the closed-loop control. A closed-loop stator current control with narrow bandwidth is applied to provide the fundamental voltage reference as well as the function of current regulation. In this way, the proposed DVC affords some attractive features: Firstly, it can suppress the steady-state resonance when the low order harmonics overlaps the resonant frequency of LC network in the drive; Secondly, it can suppress the transient resonance resulting from the perturbation introduced into the drive; Thirdly, it can compensate the steady-state deviation resulting from the delaying effect of power converters, which is even worse under high speed operation; Fourthly, it is insensitive to the system parameters. By simulation on a practical high power CSI fed PMSM drive, the validity of the DVC is verified. Key words: Electric drive system; Current source inverter; High power drive; DVC; LC resonance. 0 引言 电流源型电机驱动系统具有结构简单、输出波形好、四象限运行、可靠性强的特点[1]。 所以电流源型电机驱动系统广泛地应用在大功率电机系统中[2]。但是由于滤波电容和电机 电感存在，电流源型电机系统遇到了 LC 谐振问题[3-4]。当电机驱动系统的低次谐波接近