基于模块化功率注入模型的含UPFC电力系统潮流算法研究

Research on Power Flow Algorithm of Power System With UPFC Based on Modular Power Injection Model

文章对统一潮流控制器(UPFC)的稳态模型和含UPFC电力系统潮流算法进行了研究。运用模块化的建模思想,将UPFC的并联端、串联端等效为节点功率注入,将直流耦合关系抽象成串联端和并联端直流功率的代数方程,建立了UPFC的潮流控制模型。基于该模型提出了含UPFC电力系统潮流的交替迭代算法,在求解系统潮流方程时,将UPFC用等效节点注入功率等值,在求解UPFC潮流方程时,将系统用恒定电压源代替。算法在PSD-PF潮流程序中得到了实现,基于IEEE 9系统和南京西环网实际工程的算例验证了文中模型及算法的正确性和有效性。

In this paper, steady-state model of unified power flow controller （UPFC） and power flow algorithm of power system with UPFC were studied. Based on modularized modeling method, parallel and series sides were equivalent to separate power injections, DC link of the parallel and series sides was abstracted into algebraic equations, and UPFC power flow controlling model was established. Then, an alternating iteration algorithm of power flow for power system with UPFC was presented. In solving system equations, the UPFC was equivalent to power injection, and in solving UPFC power flow equation, the system was replaced with constant voltage source instead. The algorithm is implemented in PSD-PF power flow program. Simulation results of IEEE9 system and Nanjing Western Power Grid show that the model and algorithm is correct and effective.