Research Of Power Complementary System Of Fan And Asynchronous Generator

China’s current energy structure is still dominated by coal-fired thermal power generation.Thermal power generation occupies eighty percent of the total generating capacity.So reducing the loss of auxiliary power is an important way to help the energy saving and emissions reduction of thermal power generation.This paper proposes an energy-saving program of power complementary system of turbine-driven fan and asynchronous generator.This energy-saving program attempts to make the fan and the asynchronous generator as a pair of complementary power devices while maintain steam valve of the small turbine constant.Changes of the requirement of fan load are adjusted by absorbing or outputting power of asynchronous generator/motor,which reduces the energy loss of frequently changes of steam valve caused by the changing of fan load.As the basis for the analysis,this paper describes the working principle of the operation of energy-saving system,and builds up a mathematical model of the fan and asynchronous generator.It also points out the effect of impulse current and reactive power absorption of grid connecting of the power complementary systems,whether it can cause voltage fluctuations and power quality deterioration.Then by making a small capacity system experiment and Simulink software simulation The feasibility and safety of power complementary energy-saving program shall be demonstrated.Firstly experiments verificate automatic adjustment of power of the fan and asynchronous generator and the automatic switch of the latter between the motor and generator with the change of fan load.All of these mentioned above demonstrates feasibility of this energy-saving system.This paper then investigates the some factors of the energy saving system that may affect the safety of the grid.This paper conducts a sudden load removal transient simulation of the impact on the grid when the power complementary system is on operation,fact which proves that asynchronous generator will not have the additional impact on voltage fluctuations of the grid.Transient impact simulation of the sudden removal of asynchronous generator proves fluctuations in the voltage and current are limited at this circumstances.Simulates the transient influence of connecting between the asynchronous generator and the grid proves the connecting will not cause the grid voltage fluctuations.In summary,this power complementary energy-saving system will not cause security problems to the grid.