Strategy to Precisely Locate Voltage Sag Source in Active Distribution Grid with Data Measured by Limited Power Quality Observations
Chen Rusi1, 2, Lin Tao1, 3, Bi Ruyu1, Xu Xialing4, Qi Qing5
1. School of Electrical Engineering Wuhan University Wuhan 430072 China; 2. State Grid Hubei Electric Power Research Institute Wuhan 430077 China; 3. Solar Energy Efficient Use Collaborative Innovation Center of Hubei Province Wuhan 430068 China; 4. Central China Branch of State Grid Corporation of China Wuhan 430077 China; 5. State Grid Beijing Electric Power Company Beijing 100031 China
Abstract Precise locating of voltage sag source has important significance in promoting power supply dependability and clarifying responsibilities. As a hot research spot, a series of researches were carried out with the help of power quality (PQ) monitoring system and distribution automation system in recent years. However, existing locating methods fail to distinguish the type of sag source and need to search all the buses. Moreover, they are merely applied to traditional radial distribution grid with single power supply, and the locating accuracy is non-ideal as inaccurate estimation of transition resistance. In this paper, a precise locating strategy applied to active distribution grid with multiple distributed generators, is put forward. Firstly, the potential distribution area of voltage sag source is narrowed by the directions of sequence power increments. Then, type of sag source is identified to guide locating. For voltage sag caused by short-circuit fault, a step-by-step optimization model, which aims at minimizing the differences between the measured data and the calculated data at limited observations, is established. As the basis, impacts of distributed generators and transition resistance are considered in short-circuit calculation. Finally, based on the modified IEEE 34-node benchmark, the validity and superiorities of the proposed strategy are verified.
Chen Rusi,Lin Tao,Bi Ruyu等. Strategy to Precisely Locate Voltage Sag Source in Active Distribution Grid with Data Measured by Limited Power Quality Observations[J]. Transactions of China Electrotechnical Society, 2019, 34(zk1): 312-320.
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2019, Vol. 34 
