The characteristics of excitation system

摘要

The improvement of the power stability is now strongly required because it plays a key role for the enhancement of power supply reliability. This requirement has become particularly urgent one as power plants have expanded in their size and as their locations are getting more and more remote from populated areas. In this situation, the excitation system is also required to achieve various improvements such as smaller floor occupancy, quick response, etc. Among others, the quick response excitation system is especially of great importance, because it improves the stability of a power system and also because it is more reliable and more cost-effective than expensive reinforcement of power transmission systems. The authors discuss the relation between a recently developed excitation system and its improved stability, and the evaluation of the system stability. As a result, they reach the conclusion that in case the ceiling voltage is the same, the quick response brushless excitation system improves transient stability more effectively than the thyristor excitation system. And finally, the improvement of the power system stability by replacing a DC exciter with a brushless exciter is described as an example of the above application.