基于虚拟节点的复杂电网电压跌落随机评估方法

Stochastic Assessment Method of Voltage Dip in Complex Power Grid Based on Virtual Bus

随着电力系统中敏感设备的大量应用,电力用户对供电质量要求不断提高,电压跌落的评估成为现代电能质量研究中的一项重要内容。本文提出了一种在故障点增加虚拟节点的电压跌落随机预估方法。该方法通过求解复杂电网中任意地点发生对称或不对称故障时各节点的电压跌落幅值,计算出不同故障类型下的电压凹陷域。根据待考察的电压跌落幅值范围,推出对应的故障区间,并结合故障分布概率给出各节点年电压跌落频次的评估结果。在标准IEEE-30节点系统中验证了本文电压跌落评估方法的有效性。

With the wide application of sensitive equipment in power system,the requirement of power customers for better power quality is rising.The voltage dip assessment is becoming an important content of power quality study.In this paper,a stochastic assessment method of voltage dip with adding a virtual bus in the fault position is proposed.The remaining voltage expression of each bus is derived after a balanced or unbalanced fault taking place in any position of the complex power grid.The areas of vulnerability are calculated under different fault types.Considering the fault zone according to the remaining voltage amplitude range and the fault distribution probability,the voltage dip times per year of each bus is calculated.The validity of the proposed voltage dip assessment method is proved in the standard IEEE-30 bus system.