计及UPFC的电力系统网损优化控制研究

Research of loss optimization in power system considering UPFC installation

将统一潮流控制器(UPFC)等效为节点附加注入功率,控制变量增加了UPFC等值模型中串联电压源电压的幅值和相位,以及并联电流源电流的无功分量等控制参数,建立计及UPFC的无功优化模型。由UPFC控制参数与安装线路的电流和端点电压,推导出UPFC运行容量计算公式,结合UPFC价格与容量函数关系,确立UPFC参数与价格的数学关系,将其应用于无功优化研究,以收益最大为目标函数,分析UPFC的降损经济效益。以IEEE30节点系统为例进行仿真分析,结果表明,UPFC不仅具有良好的降损特性,而且获得的收益能够弥补自身价格昂贵的不足,具有实际应用价值。

This paper has established a reactive power optimization model with Unified Power Flow Controller （UPFC）. The parameters of UPFC, such as amplitude and phase of the voltage source in series and reactive component of parallel current source in the equivalent model, are added into control variables. While UPFC is equivalent to an additional power injection for the nodes, the operational capacity of UPFC is calculated by combining UPFC param- eters and endpoints voltage and current of installation lines. Then the mathematical relationship of parameters and price of UPFC is put forward, which is applied to the reactive power optimization. The price of UPFC is compared with the saving of energy cost by reducing power loss and the economic benefit for UPFC is studied to gain the maximal earnings. Finally simulation results in IEEE30 bus system show that not only UPFC has good features of reducing reactive power loss, but its earning can also make up for the defect of its expensive price. UPFC has practical value.