考虑功频静特性及发电机出力分配的静态电压稳定分析

摘要

以连续潮流法( CPF)通过追踪系统中各节点电压随负荷变化的PV曲线确定系统稳定运行轨迹,预测系统在静态电压稳定下的负荷裕度.提出以负荷节点电压和电源电压之间的网络灵敏度并考虑负荷频率静特性和发电机的频率静特性,对系统增加的负荷在各发电机间的分配进行调度.在此方法中平衡节点仅承担频率越限后增长的负荷.用提出的方法分配系统增加的负荷,由于考虑了系统的网络特性和功频特性,符合电力系统的实际运行,对电力系统的电压静态稳定分析有现实意义.经典型IEEE30系统的测试,其结果证明了此方法的有效性及正确性.%This paper focuses on continuation power flow (CPF) method by tracing PV curve of system bus voltages with load change to determine system stable operation and forecast system load margin under static voltage stability. The network sensitivity between load voltages and source voltages, considering static frequency characteristic of load and frequency regulation characteristic of generator, is used to develop an approach for generation dispatch for improving stability margin. In this approach, slack only need to take a balanced growth of the load of over frequency. The proposed approach gives the most desirable generation scheduling for considering power system configuration and static power frequency characteristic, which has practical significance for voltage static stability analysis of power system. The results obtained with IEEE 30-bus show the validity and correctness of the proposed method.