下垂控制型微电网孤岛检测盲区通用性求解方法

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...

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

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.