The wavelet method is applied to identify the time-dependent frequency and damping ratio based on the PMU recorded data during Pingwei generator's under-excited operation, and to analyze the relation of oscillation frequency and damping ratio with the variation of reactive power. Furthermore, the damping torque is used to analyze the reasons for the power system's easy oscillation during generator's leading phase operation with an OMIB system. Furthermore the effects of connection line's reactive power variation in magnitude and direction resulted from multi-generator's leading phase operation on regional oscillation damping were also studied and verified by simulating the Anhui network.%根据平圩电厂进相运行到迟相运行期间相量测量单元(PMU)记录的振荡轨线,采用小波方法提取有功功率受扰轨线的振荡频率及阻尼参数,分析发电机振荡频率与阻尼随无功功率变化规律;并采用阻尼转矩的方法分析单机无穷大系统中,发电机进相运行时系统易发生低频振荡的原因.在此基础上,进一步分析了多台发电机组同时进相运行时,可能导致联络线上无功功率大小及方向的变化,及其对区域振荡阻尼的影响,并以安徽电网为例进行了仿真验证.
展开▼
