基于正序电流故障分量相位比较的电压暂降扰动源分界

Demarcating method for voltage sag source of distribution network

准确判断电压暂降扰动源的相对位置,对界定供用电双方责任以及制定治理措施提高供电质量具有重要意义。文中提出了基于正序电流故障分量相位比较原理的配电网电压暂降扰动源分界方法。通过建立不同位置发生不同类型故障时的正序故障分量等值网络,分析变电站内所有进出线的正序电流故障分量相位分布与故障位置间的关联关系,进而构建基于正序电流故障分量相位比较的电压暂降扰动源分界判据及其动作边界。该方法进行电压暂降扰动源分界时仅利用站端进出线的电流信息,测量信息获取方便,具有很好的工程应用前景。基于PSCAD建模仿真,验证了短路故障、相位跳变以及负荷扰动情况下,文中所提电压暂降扰动源分界方法效果较佳。

Accurately determining the relative position of the voltage sag disturbance source is significant for defining the responsibilities of both the power supplier and the consumer and the subsequent formulation of governance measures to improve power quality.Method for demarcating voltage sag disturbance source of distribution network based on phase comparison principle of positive sequence current fault component is proposed.Positive sequence fault component equivalent networks are established when different types of fault occur in different locations.Then the correlation between phase distribution of positive sequence current fault components and fault locations of all incoming and outgoing lines in substation are analyzed.Finally,the demarcation criterion and action boundary of the method for demarcating voltage sag disturbance source based on phase comparison principle of positive sequence current fault component are constructed.The method divides the disturbance source of the voltage sag,and only uses the current measurement information of the incoming and outgoing lines at the station.The measurement information is easy to obtain and has good engineering application prospect.The effect of voltage sag disturbance source demarcation is verified by modeling and simulating based on PSCAD when short circuit faults,phase jump and load disturbance occur.