Control Strategy Research About Condensate Pump Frequency System Of Combine Cycle Unit

9F class single shaft gas-steam combined cycle generator is a new type of generator,Condensate pump is an water supply important equipment for LP(Low Pressure) drum ofHRSG(heater recovery steam generator) and the other nine process system. Condensate pumpis designed run under fifty frequencies; energy consumption of condensate pump is too large.It is plan to increase Frequency converterThis paper describes the construction principle and process of condensate pump variablespeed all process control system, in order to achieve energy-saving and full automatic controlunder all condition. Condensate pump variable speed all process control system is includesthree subsystems, they are the minimum pressure control system, the minimum flow controlsystem and low pressure drum variable speed feed water control system, it has a minimumspeed limit else. The minimum pressure control system is to meet pressure needs of the userand guarantee condensate pump safe operation. The minimum flow control system is toguarantee the safe operation of condensate pump. Low pressure drum variable speed feedwater control system is to meet the demand of low pressure drum feed water.Low pressure drum water level is the control object of low pressure drum water levelautomatic control system for as, the system output signal control valve opening, control valveregulating feed water flow. This paper studies on the low pressure drum variable speed feedwater control system, with low pressure drum water level automatic control system outputsignal as the control object. Low pressure drum variable speed feed water control system andlow pressure drum water level automatic control system are parallel operation, they arecoordination each other, they can accurate control low pressure drum water level.In this paper, during the period of low pressure drum variable speed feed water controlsystem cascade regulator parameter tuning, carry out variable speed feed water control theoryresearch, regulator parameter in order to actual commissioning. Low pressure drum variablespeed feed water control system run for a long time. Control system has good quality andgood energy-saving.Condensate pump variable speed all process control system is reasonable, It is good tocreate more energy-saving. We Gradual increase the given value of low pressure drumvariable speed feed water control system, Research on the relationship of given value andenergy-saving. We also reduce the minimum speed limit value, it produces energy-savingeffect can be obviously observed.