用于电压稳定分析的配电网动态等值

Dynamic Equivalents of Distribution Systems for Voltage Stability Studies

为了在电压稳定分析中既计入配电网的影响又不增加大量计算 ,提出对配电网进行动态等值处理。针对典型的辐射状配电网 ,提出了两种等值模型 ,即分段等值模型和全段等值模型。分段等值模型只处理了并联有载调压变压器组 ,全段等值模型同时处理了并联和串联有载调压变压器组。提出了配电网等值的方法 ,推导了等值有载调压变压器和等值负荷模型的参数。将等值模型应用于小干扰电压稳定和大干扰电压稳定研究 ,比较了等值模型的精度。

To include the distribution system in voltage stability studies simply and accurately,this paper develops a methodology for dynamic equivalents of distribution networks Two equivalent models are presented,i e equivalent in section and equivalent in total The equivalent model in section simplifies on load tap changers (OLTCs)which operate in parallel The equivalent model in total reduces OLTCs which operate in series and in parallel at the same time The principles and formulas for the equivalent parameters are worked out The entire (distribution system)model and the equivalent models are applied to both small and large disturbance voltage stability studies It is shown that the equivalent model in section has acceptable accuracy,and the equivalent model in total is less accurate than equivalent model in section