统一潮流控制器的非线性控制

通过独立控制线路的有功和无功功率,统一潮流控制器(UPFC)能够大大提高线路的传输能力。为实现这一目标,装置需要尽可能快的动态响应速度和稳定性。文中提出一种适用于UPFC装置的非线性控制策略,该控制器的理论分析基于同步旋转坐标系,充分考虑了UPFC模型的非线性特点,采用反馈精确线性化的方法进行分析。在此基础上设计得到的控制器较之传统的PI控制和解耦控制策略具有更好的稳定性和更快的动态响应。在EMTDC/PSCAD平台下的仿真结果验证了这种控制策略的优越性能。

A Nonlinear Controller for Unified Power Flow Controller

A unified power flow controller (UPFC) can independently control real power and reactive power in power line, which makes it attractive in increasing the transmission capability of transmission line. This paper presents a nonlinear control law with better stability and dynamic performance in comparison with PI controller and classical decoupled strategy. The analysis is based on the rotating reference frame, and the nonlinear property of UPFC model is partly dealt through the exact linearization via feedback. The control law is tested with the EMTDC/ PSCAD program system.