基于切换系统的并联型有源电力滤波器指令电流预测控制

SAPF current predictive control based on switch system

并联型有源电力滤波器(SAPF)是一种能有效综合治理电力系统谐波的装置.预测电流控制的方法能进一步提高电流跟踪控制的精度,消除由于采样、计算等引起的延时对于电流控制的负面影响.提出基于切换系统的并联型有源电力滤波器指令电流预测控制,切换系统依据负载发生突变引起电流突变从而做出正确的指令电流控制策略.通过数学证明的方法即引入李雅普诺夫稳定性判别法以及模型仿真实验方法对文中所构建的指令电流切换系统进行了数学理论与仿真实验的证明,结果均证明了文中所建立的切换系统在负载发生突变时具有良好的稳定性,降低了线路中电流的畸变率.

Shunt active power filter is one kind of equipment to manage the harmonic current of power grid efficiently and reasonably. The control strategy of predicting current is able to improve the accuracy of current tracing control further,and wipe out the negative influence of current control which results from delay because of sampling and calculating. The paper adopts a new predictive strategy of instruct current which is a switch system in the control part of instruct current of SAPF. The switch system will choose the right control strategy through comparing the harmonic current relative deviation related to the load current when the load mutate. The paper testifies the strategy of instruct current predictive control through the methods of mathematical proof,Lyapunov stability,and mathematical model simulation experiment,then the results prove the excellent stability of switch system when the load mutate frequently and the low distortion rate of current in the power grid.