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介绍一种新的适用于一般结构非线性多输入多输出系统的输出反馈控制理论,提出该理论的一种改进形式,从而扩展其应用范围,并进而应用于电力系统励磁控制。针对单机无穷大系统,采用角速度、机端电压及电流为反馈信号,首次推导出系统的可观域,并基于上述改进理论设计一种新的非线性输出反馈励磁控制器。该控制器不需要转子角信号,从而比一般的非线性状态反馈励磁控制器实践性强。最后利用PSCAD/EMTDC对该控制器进行暂态仿真,以验证其对电力系统扰动的抑制效果。
A new output feedback control theory suitable for general structure nonlinear multiple input multiple output system is introduced. An improved form of this theory is proposed to extend its application scope and then to the excitation control of power system. For the single machine infinite system, the angular velocity, terminal voltage and current are used as the feedback signals, the observable domain of the system is deduced for the first time and a new nonlinear output feedback excitation controller is designed based on the above improved theory. The controller does not need the rotor angle signal, which is more practical than the general nonlinear state feedback excitation controller. Finally, PSCAD / EMTDC transient simulation of the controller to verify its suppression of power system disturbances.