中压（6-10kV）感应电动机级联式多电平变频调速的成功应用

Successful Application of Multi-level and Multi-stages Connection Variable Frequency Speed Regulation System for the 10/6 kV Induction Motor in P/P

明珠电厂173 MVA燃气轮机蒸汽轮机联合循环发电厂余热锅炉(HRSG)汽包供水的给水泵(6kV)以50 Hz额定值运行了8年,2004年12月将给水泵改为变速运行,安装了级联式多电平变频调速装置。并按我厂变频改造特点,用最简单快速的处理,从工频转为变频运行,为我厂带来极大的节电经济效益。特别介绍其移相整流变压器,用硬件固定移相,以载波三角波同步调制。详细介绍各功率单元IGBT的参数,级联多电平变频在我厂应用极其稳定和成功。

The HRSG boiler steam drum water feed pump（6 kV） of the MZ 173 MVA gas turbine-steam turbine combine-cycle power plant has been changed to VVVF running in Dee. 2004, using the multi-stages and multi-level speed regulation system after its first installation 8 years ago. A big economical profit has been made, the properties of the main equipment is analyzed such as the phase-shift and rectifier transformer the IGBT is used in the inverster bridge. The parameter of IGBT is presented in detail. The multi-stage and multi- level speed regulation system is used successfully in the MZ power plant.