600 MW机组引风机电机高压变频调速装置利旧增容改造

Retrofit of high voltage variable frequency speed regulating device for induced draft fan motor of 600 MW unit

湖南华电长沙发电有限公司2台600 MW机组4台引风机变频器冷却方式均为开式循环,运行环境温湿度偏差大、粉尘含量过高,功率单元频繁发生故障。2台机组风烟系统均采用"引增合一"方式后,引风机电动机容量由4 000k W增加到6 000 k W,目前配置的4 500 k V·A高压变频调速装置已无法满足其正常运行要求。为降低投资成本,提出变频器冗余并联运行方式,提高供电系统的容量。改造后节能率高达30%~50%,同时大大降低了设施设备的能耗成本和运行成本。

Four units of induced draft fans of Hunan Huadian Changsha Power Generation Company's two units of 600 MW are open cycle type. Due to operation environment of large humidity deviation and high dust content,power unit failed frequently.After reformation of combination of ID fan and booster fan,capacity of ID was increased from 4 000 k W to 6 000 k W. Existing4 500 k V · A high voltage variable frequency device would not satisfy the requirement. To reduce the investment,the operation mode of redundant parallel was indicated. Power supply system capacity was increased. After reformation,fractional energy savings achieved 30% to 50%. At the same time,power consumption cost and operational cost was significantly reduced.