统一潮流控制器模型和控制器的设计与仿真

针对电压型逆变器的数学方程的非线性,采取了并联侧和串联侧相结合的系统性的非线性控制方法,构造出了一个以并联、串联侧电流相量为状态变量的间接控制统一潮流控制器(UPFC)的线性系统。同时结合UPFC的控制目标(有功、无功、线路电压),设计线性系统的状态变量的参考值。在线路侧电压和电容器两端电压的控制中采用PI控制,并直接利用公式推导,简洁地求出PI系数。基于EMTP的仿真验证了这种系统性非线性控制方法和PI系数求导的正确性。

The Design and Simulation of the UPFC Model and Controller

Aimed at the nonlinear mathematic equations of voltage-type inverter, adopted the nonlinear control method, by which parallel connection side and series-wound side would be combined to be as a system, a linear system of the indirect control unified power flow controller(UPLC)hasbeen constructed in which the current phasors at parallel connection side andseries-wound side are as state variable, and combined the control aims (active power, reactive power and line voltage) of UPFC, the reference value oflinearsystemstate variable is designed. Used PI control for the voltages inline side and terminals of capacitors andformula derivation directly, the PI coefficients can be deduced pithily.Basedon EMTP simulation results,thecorrectness of nonlinear control method and the derivation of PI coefficients are proved.