基于有限控制集模型预测控制的SAPF的研究

摘要

在并联型有源电力滤波器（ SAPF）动态补偿电网谐波过程中，为了快速准确地跟踪并补偿谐波电流，对基于中点箝位三电平逆变器拓扑结构的SAPF进行了分析，提出一种有限控制集模型预测控制策略。首先通过重复预测器对负载电压和电流进行超前两拍的预测，在此基础上利用p⁃q理论计算出补偿电流超前两拍的参考值，然后根据参考电流值与补偿电流值之间的误差，运用有限控制集模型预测控制器进行反馈校正和滚动优化。仿真及实验结果表明：采用该控制策略的SAPF能有效降低电网电流的总谐波畸变率，具有很好的补偿效果和鲁棒性。%In order to track and compensate the grid harmonic current quickly and accurately in the process of dy⁃namic compensation harmonic for shunt active power filter ( SAPF) , the SAPF that based on the topology structure of neutral point clamped three⁃level inverter is analyzed, and a finite control set model predictive control strategy is proposed. Firstly, the load voltage and current are predicted in two steps ahead by the repetitive predictor, and then according to these predictions, the reference value of compensation current is computed in two steps ahead through p⁃q theory. The simulation results show that the SAPF controlled by the finite control set model predictive control strategy can reduce the total harmonic distortion of grid current effectively, and has good compensation per⁃formance and robustness.