多变量统一潮流控制器最佳变量配对选择的研究

利用控制理论中的相对增益矩阵（RGA）方法对统一潮流控制器（UPFC）的多个控制回路间的耦合程度进行了定量分析，确定了UPFC的最佳变量配对关系。在此配对方案下UPFC控制回路间的耦合程度非常薄弱，因而不需采取解耦措施即可实现协调控制，简化了UPFC控制规律的设计。分析结果表明最佳变量配对关系对运行方式的变化不敏感，因而具有固定性和可行性。仿真结果验证了UPFC最佳变量配对关系的合理性和有效性。

APPLICATION OF RELATIVE GAIN ARRAY METHOD TO POWER FLOW CONTROL OF UPFC

Using relative gain array (RGA) method in control theory, the interaction among multiple control loops of unified power flow controller (UPFC) is quantitatively analyzed and the best variable pairs of UPFC are determined. Under the best variable pairs the interaction among control loops of UPFC is very weak, so the coordinated control can be implemented without taking decoupling measures and the design of control law for UPFC is simplified. Analysis results show that the best variable pairs are not sensitive to the change of operating modes, thus they are fixed and feasible. Simulation results verify that the best variable pairs for UPFC are reasonable and effective.