摘要
提出了基于负序功率流方向的电压暂降源定位依据,负序功率为正,电压暂降源位于观测点上游;反之,电压暂降源位于观测点下游。同理,应用叠加定理,将对称扰动下的某两相工频故障分量部分转化为"虚"负序功率,通过虚负序功率流向定位对称扰动源。该方法从原理上不需要故障前信息,适用于各种电网结构,可应用于负序功率继电器,作为报警信号指示电网中暂降扰动的方位。
According to the superposition theorem of linear circuits,using the above characteristics of negative sequence power flow, a method of voltage sag source location based on negative sequence power was proposed. If the negative sequence power calculated at the observation points is positive, a sag source is located at upstream, and on the contrary, a sag origin downstream. Similarly, when the symmetric disturbance occurs, the two-phase power frequency fault component is partly converted to virtual negative sequence power, then, with the polarity of the virtual negative sequence power, the direction of the symmetric disturbance source is confirmed. The benefit of this approach is that there needs no any data before failure in principle, and it is suitable for all kinds of power grid structure.
出处
《电器与能效管理技术》
2016年第1期55-61,共7页
Electrical & Energy Management Technology
关键词
电能质量
电压暂降
源定位
负序功率流
power quality
voltage sag
source location
negative sequence power flow
