多机系统励磁与UPFC非线性协调控制策略研究

Research on Nonlinear Coordination Control Strategy of Multimachine System Excitation and UPFC

装设有统一潮流控制器(UPFC)的大电网是一个复杂且易受扰动的非线性系统。为此推导出了装设有UPFC装置的多机电力系统数学模型,在此基础上构造了系统的Hamilton能量函数,进而将此系统表示成含参数扰动的Hamilton系统形式。根据边界函数法和干扰抑制控制法得到了考虑转移电导的多机励磁与UPFC的协调控制器。在PSCAD/EMTDC仿真平台搭建四机两区域系统,对比仿真结果表明,所设计的非线性协调控制器具有良好的控制效果和较强的鲁棒性。

The large grid with a unified power flow controller(UPFC)is a complex and susceptible nonlinear system.The mathematical model of multi-machine power system equipped with UPFC device was derived.Based on this,the Hamilton energy function of the system was constructed,and then the system was represented as a Hamilton system with parameter disturbance.According to the boundary function method and the interference suppression control method,a coordinated controller of multimachine excitation and UPFC considering transfer conductance was obtained.The four-machine two-area system was built on the PSCAD/EMTDC simulation platform.The simulation results show that the designed nonlinear coordination controller has good control effect and strong robustness.