1 引言发电厂既是电能的生产者,又是电能的用户和消费者,我国的发电能源构成中,火电占70％以上,而一般的火电机组,其厂用电一般占发电量的40％～70％,而拖动大容量风机、水泵类辅机的高压厂用电动机的耗电量占厂用电的80％左右。由于电力体制改革中厂网分开、竞价上网等新举措的 1 Introduction Power plants are not only the producers of electric energy, but also the users and consumers of electric energy. In our power generation, the thermal power accounts for more than 70% of the total power generation. However, the average power consumption of the thermal power plants accounts for 40% 70%, while dragging large-capacity fans, pumps, auxiliary power plant high-voltage motors account for about 80% of electricity consumption. Due to the power system reform in the factory network separate, bidding and other new initiatives