四川茂县水电群孤网运行电压控制

摘要

水电群通过长距离超高压通道送电,大扰动后与电网解列而形成水电群孤网,孤网可能产生高压现象.基于四川茂县水电群的实际情况,对孤网高压问题进行研究,分析其主要成因,讨论利用发电机进相运行能力解决问题的可行性,提出了通过发电机励磁控制的方法,充分而合理地利用发电机进相能力.安全、有效地控制水电群孤网电压.%After a large disturbance, the hydropower group connected to main system through a long distance and extra-high voltage power line may split from the system and turn into isolated operation. Over-voltage phenomenon may occur in the isolated network. Based on the actual case of Maoxian hydropower group in Sichuan province, the problem of over-voltage control in the isolated network is studied. The major causes of over-voltage are analyzed and the feasibility of over-voltage suppression by generator leading phase operation is discussed. Methods to adequately and reasonably utilize generator' s leading phase operation capability through excitation control of generator are proposed to control isolated system voltage safely and effectively.