定子绕组暂态过程对电力系统大扰动特性的影响

Influence Study of Stator Winding Transient on Large Disturbance Characteristics of Power Systems

为了研究发电机3种机电暂态模型定子电压方程中定子绕组暂态(p)和转速变化(ω)对大扰动特性的影响,通过单机变压器双回线无穷大系统对3种模型在定子绕组暂态和转速单独作用以及共同作用等情况下的大扰动特性进行计算,得出定子绕组暂态对发电机大扰动的影响较大;在此基础上,将上述条件下3种模型的大扰动特性和暂态稳定极限与经过试验验证的时步有限元模型进行了对比。结果表明,计及定子绕组暂态和转速变化的3种机电暂态模型的大扰动特性和暂态稳定极限均与时步有限元结果更接近,并且在一定程度上提高了电网的最大传输功率计算值,为电力系统仿真中发电机的建模提供了重要的理论基础。

In order to study the influence of the stator winding transient process （pφ） and the rotate speed （ω） in stator equations of electromechanical transient models on Large Disturbance Characteristics, the large disturbance characteristics of three electromechanical transient models are simulated under considering stator winding transient process only, considering rotate speed only, and considering both or not through a single generator-transformer- double lines-infinite system. On the basis, the large disturbance characteristics and the transient stability limits simulated by electromechanical transient models considering the stator winding transient process and the rotate speed or not are compared with Time Step Finite Element Method （TSFEM）. The result indicated that the stator winding transient process has a big influence on large disturbance characteristics. It is closed to the results of TSFEM that the large disturbance characteristics and transient stability limits which are calculated by electromechanical transient models considering above two kinds of conditions. The calculated value of maximum transmission power is increased with two kinds of conditions considered. The result provides theoretic basis to generator modeling in power system simulations.