Abstract: The energy saving principle of pump controlled by variable frequency speed control technology was introduced, the application of converter in power plant service water supply system with constant pressure was presented. Aiming at the problems occurred in service water pump system of Huaibei Guoan Electric Power Corporation Limited, some concrete measures for variable frequency energy saving reformation were put forward, and obvious energy saving effect was obtained after the reformation.

Key words: variable frequency speed control, energy saving, water supply system with constant pressure, benefit analysis