浅谈自并励励磁系统在大容量机组中的应用

发电机的励磁系统是同步发电机的重要组成部分,其主要任务是根据发电机运行状态,向发电机的励磁绕组提供一个可调节的直流励磁电流,以满足发电机各种运行方式的需要。励磁系统直接影响发电机的安全运行,其技术性能低下将给机组的运行造成了极大的安全隐患。为满足电力系统对发电质量高标准的要求,确保发电机组长期安全、稳定地运行,必须采取先进科学的励磁系统。通过介绍目前国内外600 MW及以上机组的主要励磁方式,对发电机自并励励磁系统和无刷旋转整流器励磁系统的特点进行了分析比较,提出自并励励磁系统具有接线简单、主机轴系短、造价低、运行维护方便、反应速度快等特点,并分析了大容量机组采用自并励励磁系统的可行性,可供工程设计参考。

Application of self-excitation mode in large capacity generator unit

The excitation mode is one important component part of synchronous generator.Its major objective is to maintain generator terminal voltage and improve power system stability.If there are low technical performance and automation to the excitation,it will cause enormous hidden danger on the operation of unit.In order to satisfy the high standard of generator quality for the power system needs,advanced excitation system should be adopted,and so it can ensure that the power supply unit shall be done in the safe and stable condition at long time.This paper mainly introduces the different excitation modes of 600MW or above power generator unit.With a further discussion on characteristics of different types of excitation mode,this paper suggests potential source brushless excitation mode should be adopted in great capacity generator.