UPFC有功控制引起的交互影响研究

摘要

统一潮流控制器(UPFC)的多个控制器之间存在交互影响,这种交互作用会影响控制器的工作性能.分析了UPFC有功参考值的变化对电压控制器所控电压的影响,阐述了利用数学公式反映其影响的方法的局限性.利用PSCAD/EMTDC时域仿真,得出了电压动态数据,并用来拟合Logistic模型,得到有功补偿度变化量对节点电压变动值影响的数学表达式.该数学表达式能够针对不同有功补偿度变化量进行交互影响程度的预测,有利于分析UPFC有功潮流控制给并联侧电压控制器运行带来的影响.%There are interactions among the sub-controllers of UPFC(Unified Power Flow Controller),which may affect its control performance.The effect of the active-power reference change of UPFC on the controlled voltage of its voltage controller is analyzed and the limitation of applying mathematical formula to reflect this effect is expounded.The time-domain simulation with PSCAD/EMTDC is carried out to obtain the dynamic data of voltage,which are used to fit a Logistic model for deducing a mathematical expression to describe the effect of active-power compensation degree on the nodal voltage variation.The deduced expression is then applied to predict the interaction degree according to the active-power compensation degree,which is then used to analyze the effect of UPFC active power-flow control on the operation of its voltage controller at parallel side.