电流定向旋转坐标下的统一潮流控制器串联侧变流器解耦控制研究

A novel power decoupling control in the current-orient rotating frame for series-side converter of unified power flow controller

文中分析电压定向旋转坐标系下UPFC系统串联侧变流器常规交叉解耦控制方法的有功、无功控制环路耦合问题,提出基于线路电流定向旋转坐标系下的新型交叉解耦控制策略,并采用双二阶广义积分开环相位测量方法加快电流相位测量速度。多场景对比仿真结果表明,该方法有效减弱UPFC系统有功、无功控制环路之间的耦合,提高潮流控制速度和效果。

This paper analyzes the active and reactive power control loop coupling characteristics of the conventional cross decoupling control strategy in the voltage-orient rotating d-q frame for unified power flow controller ( UPFC ). A novel cross decoupling control strategy based on line current-orient d-q rotating frame for series-side converter is proposed in the paper. A dual second order generalized integrator ( SOGI) open loop phase measurement method is introduced to enhance current phase measurement speed. The results of comparative simulations show that the proposed control method can effec-tively weaken the control coupling between active and reactive control loop, and enhance tlie power flow control speed and performance.