基于MATLAB仿真的发电机阻尼绕组负面影响研究

Dynamic simulation using MATLAB for overall evaluation of negative impact of the damper winding of a generator

发电机阻尼绕组的设计理念是为了提高电力系统的动态稳定性,但在超高压、远距离、大电网系统中,发电机阻尼绕组对提高动态稳定性方面的作用不明显.基于MATLAB-S im Power System s的动态仿真结果,从空载情形的发电机机端三相短路、机端相间短路和发电机所连线路远处三相短路的角度,讨论了发电机阻尼绕组对电力系统的负面影响,仿真结果证实了阻尼绕组不仅会导致短路电流幅值成倍地增大,而且会给电力系统带来高次谐波.

The design of the damper winding of a generator was developed in order to increase dynamie stability of power systems. However, in a large power system with high voltage and long distance, the effect of damper winding of a generator on the dynamic stability is not apparent. Based on some results from the dynamic simulation using MATLAB-Sim power systems, the negative impact of the damper winding of a generator on power systems was analyzed by describing symmetrical fault,line-to-line fault at unloaded synchronous machines and symmetrical fault at consumers remoted from synchronous machines. The results show that short-circuit currents may be several orders of magnitude larger than normal operating currents due to the damper winding, and the damper winding may cause harmonics to power systems.