单相统一电能质量调节器的H_∞控制策略研究

Study on the H_∞ Control Strategy of Single Phase Unified Power Quality Conditioner

基于H∞控制理论,对单相统一电能质量调节器的优化控制问题进行了研究。根据三桥臂单相统一电能质量调节器的拓扑结构,建立系统的周期平均模型,并在平衡流形领域对原模型进行状态重构。针对重构后的系统模型,采用线性矩阵不等式的鲁棒控制处理方法,设计了单相统一电能质量调节器的最优H∞输出动态反馈控制器。仿真结果验证了该控制器不仅有良好的动态响应和补偿效果,而且对负载变化有较强的鲁棒性。

Based on H∞ control theory, the optimization control strategy for single phase unified power quality conditioner （ UPQC ） is researched. In accordance with the topological structure of three bridge arm single phase UPQC, the system cycle average model is built, and the state reconstruction of original model is conducted in equilibrium manifold area. For the reconstructed system model, by adopting linear matrix inequality robust control processing method, the optimal H∞ output dynamic feedback controller for single phase unified power quality conditioner is designed. The result of simulation verifies that the control strategy offers excellent dynamic response and compensation effect, and more powerful robustness to load variation.