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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。
By independently controlling the active and reactive power of the line, the Unified Power Flow Controller (UPFC) can greatly improve the transmission capacity of the line. To achieve this goal, the device needs the fastest dynamic response speed and stability. In this paper, a nonlinear control strategy suitable for UPFC devices is proposed. The theoretical analysis of the controller is based on the synchronous rotating coordinate system. The nonlinear characteristics of the UPFC model are fully considered and the feedback linearization method is used to analyze the nonlinearity. Based on this, the designed controller has better stability and faster dynamic response than the traditional PI control and decoupling control strategy. The simulation results under the EMTDC / PSCAD platform verify the superior performance of this control strategy.