基于有限控制集模型预测控制的APF控制策略仿真

为提高三相四线制电容中分型有源电力滤波器(APF)的稳态和动态补偿特性,引入有限控制集模型预测控制(FCS-MPC)作为其电流控制策略。首先建立并推导了系统在三维αβγ坐标系下的离散预测模型,使得三相耦合和不平衡电流问题得以解决;并根据预测模型,计算出所有预测电流,通过遍历法找到最优开关状态作为输出,达到快速跟踪指令电流的目的,无需调制环节,控制十分简单;同时采用双环PI控制实现直流侧电容电压的稳定和平衡。最后,通过与复合控制方法的仿真比较,验证了该策略在APF系统控制中的可行性和有效性。

Simulation of Control Strategy for Active Power Filter Based on Finite Control Set Model Predictive Control

A control strategy based on finite control set model predictive control (FCS-MPC) is introduced as its current control strategy in order to improve both steady and dynamic compensation feature of mid-point active power filter (APF) of three-phase four-wire capacitor. Firstly,the discrete prediction model of system is established and derived at three-dimensional coordinate system to solve the problem of three-phase coupling and unbalanced current. Then,all the prediction currents are calculated in accordance with the pre-diction model and the optimal switching state is found as output by way of traversal method,with purpose of fast tracking the command current and the control is very simple without modulation link. At the same time,double loop PI control is adopted to achieve the stability and balance of capacitor voltage at DC side. Finally,the feasibility and effectiveness of the strategy in APF system control is verified through the simulation comparison with compound control method.