摘要
暂降源定位对于查找暂降源、划分暂降责任有重要作用。为了确定暂降源的上下游位置,从线性电路的叠加原理入手,通过分析故障过程中电气特征变化规律,提出了基于扰动无功功率变化特征的电压暂降源定位方法。当发生三相对称故障时,如果监测点的正序扰动无功功率方向与规定正方向一致,电压暂降源在上游,反之则在下游;当发生不对称故障时,如果监测点的负序扰动无功功率方向与规定正方向一致,电压暂降源在下游,反之则在上游。大量仿真与实测数据表明,研究结果不受暂降持续时间影响,能够实现电压暂降源的上下游定位,具有较高准确率。
Voltage sag location plays an important role in seeking voltage sag source and dividing the responsibility.To determine the location of a voltage sag source,a voltage sag location approach was proposed based on the variation in disturbance reactive power in the superposition principle of linear circuit,and the variation of electrical characteristics during faults were analyzed.Results show that when a three-phase symmetric fault occurs,the voltage sag source can be determined in the upstream if the direction of positive-sequence disturbance reactive power is in accord with the regulated positive direction at a monitoring point;otherwise,in the downstream.When an asymmetric fault occurs,the voltage sag source is determined in the downstream if the direction of negative-sequence disturbance reactive power is in accord with the regulated positive direction at a monitoring point;otherwise,in the upstream.A large quantity of simulation and measured data indicates that the proposed approach is not susceptible to sag duration and can make it possible to determine the upstream or downstream location of a voltage sag source.The approach has high accuracy of location.
作者
胡安平
陶以彬
庄俊
瞿科
胡畔
丁凯
HU An-ping;TAO Yi-bin;ZHUANG Jun;QU Ke;HU Pan;DING Kai(National Key Laboratory on Operation and Control of Renewable Energy and Energy Storage, China Electric Power Research Institute Co., Ltd., Nanjing 210003, China;Jiangsu Engineering Technology Research Center for Energy Storage Conversion and Application, China Electric Power Research Institute Co., Ltd., Nanjing 210003, China;College of Electrical Engineering, Sichuan University, Chengdu 610065, China;State Grid Hubei Electric Power Research Institute, Wuhan 430077, China)
出处
《科学技术与工程》
北大核心
2020年第30期12415-12422,共8页
Science Technology and Engineering
基金
国家电网公司总部科技项目(NY71-18-027)。
关键词
电压暂降
定位
扰动
无功功率
负序
voltage sag
location
disturbance
reactive power
negative sequence
