OLTC和OXL的动态特性对电力系统长期电压稳定性的影响研究

在MATLAB/SIMULINK环境下,通过考虑慢动装置(有载分接头变压器OLTC、过励限制器OXL)的动态特性来研究一个简单电力系统长期动态电压稳定性。经过研究发现:对于某些干扰,系统可能不会遭遇短期电压稳定性问题,但是由于发电机过励限制器等的作用,却会遭遇长期电压稳定性问题。同时还发现:向负荷节点提供大量无功功率可以提高系统的长期和短期电压稳定极限。

Under the MATLAB/SIMULINK environment,this paper investigated the long-term dynamic voltage stability of a simple power systemby considering the dynamic performance of slow-acting devices（on-load tap changer,over excitation limiter）. We observed that for some disturbances,the system may not face any voltage instability problem in short-term but it may suffer fromvoltage instability problem in long-term because of the activation of generator over excitation limiters.It was also observed that both the short-term and long-term voltage stability limits can be improved by providing adequate reactive power support at load buses.