基于负序电流注入的光伏并网逆变器孤岛检测方法

发布时间：2018-04-11 21:58

本文选题：孤岛检测 + 电压不平衡度　；参考：《电力系统保护与控制》2014年24期

【摘要】：孤岛运行时光伏电源继续向负载供电,会给检修人员和用户设备带来安全隐患,快速有效地实现孤岛检测具有重要意义。提出了一种通过并网逆变器注入负序电流并检测公共连接点电压不平衡度的快速孤岛检测方法。通过合理投切负序电流注入降低了对电网的干扰,不受电网不对称故障的影响且无检测盲区。在光伏电源功率与负荷功率匹配、公共连接点电压和频率基本不发生偏移的情况下对该方法进行了仿真验证,结果表明即便在这种最不利于孤岛检测的情况下,该方法仍能快速准确地检测出孤岛运行状态。
[Abstract]:Photovoltaic power supply continues to supply power to the load while the isolated island is running, which will bring safety hidden trouble to the maintenance personnel and the user equipment. It is of great significance to realize the detection of isolated island quickly and effectively.A fast islanding detection method by injecting negative sequence current into grid-connected inverter and detecting the voltage imbalance of common connection points is presented.The negative sequence current injection can reduce the interference to the power network, and it is not affected by the asymmetric fault of the power network and has no detection blind area.When the power of photovoltaic power is matched with load power and the common connection voltage and frequency are not offset, the simulation results show that the proposed method is most unfavorable to islanding detection.This method can detect the running state of isolated islands quickly and accurately.
【作者单位】：华北电力大学电力工程系;
【基金】：国家自然科学基金项目(51307059) 中央高校基本科研业务费专项资金资助(2014MS86)~~
【分类号】：TM464

【共引文献】