电力系统保护与控制2016，Vol.44Issue(24)：17-23,7.DOI:10.7667/PSPC152217
基于LIBSVM识别并网PV系统阻抗的输电线电流保护自适应策略研究
Research on adaptive strategy for overcurrent protection based on identifying the equivalent impedance of grid-connected PV system by LIBSVM
摘要
Abstract
To solve the problem refusal/incorrect tripping of overcurrent protection caused by power fluctuations of the distribution grid-connected photovoltaic (PV) system, this paper proposes an adaptive strategy based on the LIBSVM for overcurrent protection. The PV system dynamic model which combines with low voltage ride through (LVRT) control strategy is built on the platform of Matlab/Simulink. It also simulates and analyses the characteristics of the short-circuit and the influence on overcurrent protection with the different fault at different locations during the normal operation of PV power output fluctuations. A method is proposed to identify equivalent impedance of the grid-connected PV system during different output based on support vector machines (SVM), a line current adaptive protection criterion is developed, which dynamically adjusts the setting value under the PV system output power and operating modes. The simulation shows that the adaptive strategy can avoid the problem refusal/incorrect tripping of overcurrent protection and improve protection’s performance.关键词
并网光伏/低电压穿越控制策略模型/故障特性/电流保护影响/自适应保护判据Key words
grid-connected PV/LVRT control strategy/characteristics of the short-circuit/influence on overcurrent protection/adaptive protection criterion引用本文复制引用
孟龙,刘清贵,晁勤,王一波,李育强..基于LIBSVM识别并网PV系统阻抗的输电线电流保护自适应策略研究[J].电力系统保护与控制,2016,44(24):17-23,7.基金项目
国家自然科学基金资助项目(51367017)；科技部国家国际科技合作专项资助(2013DFG61520) This work is supported by National Natural Science Foundation of China (No.51367017) and International S&T Cooperation Program of China (ISTCP)(No.2013DFG61520) （51367017）
