高功率因数无电解电容IPMSM驱动系统电流跟踪控制策略  

Current tracking control strategy for high power factor electrolytic capacitor-less IPMSM drive system

作　　者：梁晨[1] 章玮[1] LIANG Chen;ZHANG Wei(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《电机与控制学报》2021年第10期1-8,共8页Electric Machines and Control

基　　金：浙江省自然科学基金(LY19E070005)。

摘　　要：针对传统无电解电容永磁同步电机驱动系统中功率环引起的控制器参数整定困难、系统稳定性低等问题,提出一种无需功率环直接计算电机电流指令以实现网侧高功率因数的方法:基于系统方程的收敛性分析,将系统方程离散化处理后在线计算电机q轴最优电流指令轨迹。针对采用PI控制器跟踪q轴周期电流指令存在跟踪误差的问题,提出一种电流指令补偿方法:通过分析电流环传递函数,计算出实际电流与电流指令间幅值与相位的误差,并利用误差数值对电流指令进行补偿。对控制策略进行仿真与实验验证,结果表明:电流指令补偿策略有效提高了PI控制器对周期最优电流指令的跟踪效果,最优电流指令控制策略在实现了网侧高功率因数运行的情况下简化了控制系统并提高了系统稳定性。In order to solve the problems of difficult controller parameter setting and low system stability caused by power loop in traditional electrolytic capacitor free permanent magnet synchronous motor drive system,a method of directly calculating motor reference current without power loop is proposed to achieve high power factor at grid side.Based on the convergence analysis of system equation,the system equation was discretized to calculate the optimal reference current of motor q・axis on-line.To solve the problem of tracking error in tracking q-axis periodic reference current by PI controller,a reference current compensation method was applied.By analyzing the current loop transfer function,the amplitude and phase error between actual current and reference current was calculated,and the error value was used to compensate the reference current.The simulation and experimental verification of the control strategy show that the reference current compensation strategy effectively improves the tracking effect of the PI controller on the periodic optimal reference current.The optimal reference current control strategy simplifies the control system and improves the system stability under the condition of realizing the operation of high power factor at the grid side.

关 键 词：无电解电容 永磁同步电机 高功率因数 电流跟踪 PI控制器 电流指令补偿 

分 类 号：TM351[电气工程—电机]