含FACTS元件的电力系统三相潮流分析

摘要

电力网络中加入FACTS元件改变了原有网络三相系统的结构,常规三相潮流应随之变化.该文针对此类问题在对几种典型FACTS元件潮流控制机理及常规三相潮流分析的基础上,建立了分别含TCSC,SVC和UPFC三类典型FACTS元件的三相潮流的三序解耦模型.将TCSC用等效阻抗并经相序变换成序参数,加人到常规三相潮流方程中作为状态变量;根据SVC的潮流控制目标将并有SVC的节点作为PV节点处理;而UPFC采用附加节点注人功率模型.含FACTS元件的三序解耦模型都采用正序约束条件,并结合牛顿-拉夫逊法编制程序,算例验证了含FACTS元件的三相潮流的收敛性.%The structure of the three phase electric power network is changed by the application of FACTS devices, which causes the conventional three-phase power flow to change. Based on the mechanism analysis of typical FACTS devices power flow control and conventional three-phase power flow analysis, this paper presents three-sequence decoupling models of TCSC, SVC and UPFC for typical FACTS devices. The equivalent impedance of TCSC is transferred into sequence parameter by phase-sequence transformation and it is added to the equation of conventional three-phase power flow as state variables. The SVC node was processed as a PV node according to the target of SVC power flow control and an additional nodal injection power model was adopted for UPFC. The positive sequence constraint condition was used for the three-sequence decoupling model of FACTS, and then the three phase load flow programs were compiled by incorporation the Newton-Raphson algorithm. Finally, the convergence of the power flow is proved by the examples.