Dynamic Characteristics Analysis of Gas-steam Combined Cycle System
With the adjustment of energy structure,higher requirements are put forward for the environ-mental protection performance of power equipment.The gas-steam combined cycle unit using clean en-ergy natural gas as fuel has become the main equipment for clean energy power generation.Therefore,it is necessary to study and analyze the dynamic characteristics of the combined cycle system.In this paper,a gas-steam combined cycle system model including surge margin and NOx emission is built.At the same time,the performance changes of the system under different fuel flow,adjustable inlet guide vane(IGV)and ambient temperature were studied.The results show that the output power of the system is most affected by the change of fuel flow.The surge margin is most affected by the change of IGV.The temperature before the turbine is most affected by the change of ambient temperature.NOx emissions are greatly affected by fuel flow,IGV and ambient temperature.This study provides a theoretical basis and technical support for the performance optimization of combined cycle generating units.
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