基于MM430变频器的空冷风机低电压穿越改造方式

Low Voltage Crossing Modification Mode of Air-cooling Fan based on MM430 Inverter

火力发电厂直接空冷系统是直接空冷机组中的关键设备之一,承担着为汽轮机乏汽降温并调节机组背压的作用,而空冷岛风机是能够达成上述能力的核心设备。空冷岛风机的稳定运行是直接空冷机组安全、可靠、优质、经济运行的重要保证。分析了山西京能吕临发电有限公司空冷岛风机变频器控制系统在运行中产生的问题,以西门子MM430变频器为例,提出了一种可以应对厂用配电系统电压波动导致变频器故障的控制回路改造方式。

The direct air-cooling system of thermal power plant is one of the key equipment in the direct air-cooling unit,which undertakes the role of cooling steam turbine and adjusting the back pressure of the unit,while the air-cooling island fan is the core equipment to achieve the capabilities mentioned above.The stable operation of air-cooling island fan is an important guarantee for the safe,reliable,qualified and economical operation of the direct air-cooling unit.The problems in the operation of the air-cooling island fan inverter control system of Shanxi Jingneng Lvlin Power Generation Co.,Ltd.are analyzed,and taking Siemens MM430 inverter as an example,a control loop modification mode which can deal with the inverter fault caused by voltage fluctuation of the power distribution system in the factory is proposed.