基于相关增益的电压稳定关键注入区域识别

Voltage Stability Critical Injection Area Determination via Cross-Relative Gain

提出一种识别影响电力系统电压稳定关键节点的关键注入区域新算法。计算系统各节点的电压稳定指标,确定系统电压稳定关键节点。以电压稳定关键节点为关键注入区域的主导节点,借助相关增益矩阵的相关性质,识别与系统中各电压稳定主导节点存在强电压耦合关系的负荷节点和发电机节点,构建含电压稳定主导节点的电压稳定关键注入区域;针对所得注入区域,给出系统稳态和紧急情况下改善系统电压稳定性的相关控制策略。将所提方法应用于New England 39节点系统中,分析、对比结果验证了所提方法的正确性和有效性。最后将该方法应用于波兰电网中,验证了该方法的实用性。

This paper proposes a novel method for identifying the voltage stability critical injection areas（VSCIA） that impact the voltage stability of critical nodes in power systems.The voltage stability critical nodes are identified through the voltage stability index（VSI）.Considering the voltage critical nodes as the pilot buses of VSCIAs,the load and generator nodes that have strong voltage coupling with the pilot buses are identified according to the cross-relative gain（CRG） and then the VSCIAs containing the voltage stability pilot buses are constructed.Moreover,based on the practical VSCIAs,a voltage control strategy under steady state and emergency conditions is proposed to improve the voltage stability of the system.Finally,the effectiveness of the proposed method is demonstrated in the New England 39-bus system.Besides,the method is further applied in the Polish power grid to verify its feasibility and practicality in bulk power systems.