离相封闭母线动-热稳定性分段联合仿真分析方法

As an important part of power generation system, the dynamic and thermal stability of enclosed isolated phase bus (EIPB) under extreme working condition such as short-circuit current. The analysis of dynamic-thermal stability for EIPB becomes a key point in the design process for cooling system. For the large size and complex structure of EIPB, especially the thin shell and plenty of Sharp body, mesh results seems to be poor at most situation in FEM calculation. A method of bus segment joint simulation method is proposed. The whole bus model is divided into several sub-segments. The temperature rise and temperature gradient distribution of the transfer interface are adopted among the sub-models cased on the unified matrix. The key parameters such as conduction convection coefficient are obtained by experimental verification based on theoretical calculation. The evaluation method of the model linkage simulation is studied. This simulation method is applied to the analysis of a type of EIPB. Moreover, the temperature rise under cooling condition are calculated using this method. The temperature rise distribution of bus in natural cooling condition and certain air cooling condition is obtained. On this basis, the calculation model of bus dynamic stability under short circuit condition is established, and the electrodynamic force under short circuit current is verified, which proves the feasibility of this analysis method.