统一定点坐标变换及其在有源电力滤波器电流控制中的应用  

Unified Fixed Point Coordinate Transformation and Its Application to APF Current Control

作　　者：谢冰若[1] 陈乔夫[1] 

机构地区：[1]华中科技大学电气与电子工程学院,湖北省武汉市430074

出　　处：《中国电机工程学报》2009年第S1期210-216,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50477047)~~

摘　　要：提出一种统一定点坐标变换和基于该变换的有源电力滤波器零稳态误差电流控制方法。统一定点坐标变换可以将静止a-b-c坐标系下含多个频率正弦分量的三相电流指令一次变换为统一定点δ-ξ坐标系下的恒直流指令,处于静止a-b-c坐标系和统一定点δ-ξ坐标系下的有源电力滤波器状态空间平均模型是不同的,后者比前者多了一个包含自干扰和耦合干扰的干扰项。为实现零稳态误差跟踪谐波电流指令,在统一定点δ-ξ坐标系下不仅需要采用PI控制器和系统电压前馈控制,还需进行自干扰和耦合干扰前馈以克服这两类干扰对输出的影响。仿真实验表明:提出的电流控制方法可实现零稳态误差跟踪谐波电流指令,且动态特性良好。Unified fixed point coordinate transformation (UFP-CT),and a novel zero steady-state error current control method for active power filter(APF) based on UFP-CT were proposed.UFP-CT can convert the three-phase current commands of APF in a-b-c stationary frames,which contain multiple sinusoidal components,into constant DC quantities inδ-ξUFP frames.In addition,the state space average models of APF in a-b-c stationary frames andδ-ξUFP frames are different.Compared with the former,the latter has additional self disturbance and coupling disturbance.In order to realize zero steady-state error current control of APF,not only PI controller and source voltage feed-forward control should be used inδ-ξUFP frames,but also self disturbance and coupling disturbance feed-forward controls are required to cancel out the influences of these two types of disturbances.Simulation results demonstrate that the proposed current control method has zero steady-state error and good dynamic response.

关 键 词：统一定点坐标变换 有源电力滤波器 电流控制 谐波电流 零稳态误差 动态特性 

分 类 号：TN713.8[电子电信—电路与系统]