下垂控制型微电网孤岛检测盲区通用性求解方法  

General Solution Method for Non-detection Zone of Droop-controlled Islanding Detection in Microgrid

作　　者：吴宇奇 叶雨晴 马啸 李正天[1] 林湘宁[1] 徐海波 WU Yuqi;YE Yuqing;MA Xiao;LI Zhengtian;LIN Xiangning;XU Haibo(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology),Wuhan 430074,China;Guangdong EAST Power Co.,Ltd.,Dongguan 523808,China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074 [2]易事特集团股份有限公司,广东省东莞市523808

出　　处：《电力系统自动化》2021年第10期106-114,共9页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2018YFB0904100);东莞市引进创新科研团队计划资助项目(201536000200036)支持。

摘　　要：目前孤岛检测研究中针对下垂控制策略下过/欠电压检测法与过/欠频率检测法的检测盲区分析尚不完备,相关参数对检测盲区的分布影响不清晰且分析方法难以适用于复杂实际微电网。为此,面向下垂控制型微电网实际运行工况,首先分析得到下垂控制方程、负荷等效方程、线路功率方程、稳态功率平衡方程4类通用性方程,并将其联立采用牛顿-拉夫逊法迭代求解检测盲区。然后,以可视化方式探究了负荷等效模型、线路阻抗参数及下垂控制特性对检测盲区的分布影响,揭示了下垂控制的检测盲区特性。最后,利用仿真软件验证了检测盲区分析的正确性,并证实了检测盲区求解算法适应求解不同工况的优异性能。The problems in existing islanding detection research is that the analysis of the non-detection zone of the over/under voltage detection method and the over/under frequency detection method in the droop control strategy are not complete, the influence of related parameters on the non-detection zone is not clear and the analysis method is difficult to be applied to the complicated actual microgrid. Firstly, four general equations of the droop control equation, the load equivalent equation, the line power equation and the steady-state power balance equation are obtained based on the analysis of actual microgrid operation conditions equipped with distributed resources in the droop control strategy, and solved iteratively by Newton-Raphson method.Then the influence of the load equivalent model, line impedance parameter and droop control performance on the non-detection zone distribution is explored in a visual way, and the characteristics of the non-detection zone are revealed. Finally, using the simulation software, the correctness and accuracy of the analysis of the non-detection zone are verified, and the excellent performance of solving algorithm for the non-detection zone is proven to be suitable for different operation conditions.

关 键 词：微电网(微网) 孤岛检测 检测盲区 下垂控制策略 过/欠电压 过/欠频率 

分 类 号：TM73[电气工程—电力系统及自动化]