| As a kind of new energy saving technology, the frequency conversion speed regulation technology has been continuously expanded in our country. Especially in the power generation enterprises in the country, with the gradual consumption of coal energy,the national environmental protection requirements of the increasingly strict, the cost of power generation increased dramatically. So to reduce the power consumption of the auxiliary power, reduce the power consumption rate has become an important indicator to reduce the cost of power generation. 350 MW unit boiler fan in the power plant is the main object of the application of high voltage inverter for energy saving. Induced draft fan with variable frequency device, air adjustment relative to the original operation mode has great changes, due to fan a wide speed range, energy saving potential is big, to reduce turbine load and low load operation condition of plant consumption can achieve higher economic and technical. The main auxiliary equipment of thermal power plant are traditional frequency operation, when the load is low power consumption. Frequency conversion device can be applied to the power plant reduce auxiliary power, plant electricity rate,reduce the standard coal consumption, so as to achieve purpose of reducing the cost of power generation. The enterprise will be more profitable investment to environmental transformation, clean power generation. Meet the national energy-saving emission reduction and environmental protection requirements.Firstly, this paper describes the situation of the development of frequency converter at home and abroad, foreign developed countries in the high and low voltage variable frequency technology has advantage, in recent years the domestic high voltage inverter through the introduction of foreign technology has also been rapid development. Followed by the introduction of the basic situation of the power plant and the general situation of the fan system, the plant original cited fan for power frequency operation mode, unit operation under low load, wind machine consumes a lot of electric energy and often stall in the static vane is low fan, the normal operation of the threat to the unit and regulatory is poor. Again through an overview of the basic principle of high voltage frequency converter leads to the research on the particular application of VVVF technology in the production field, the thermal power plant lead fan selection of 6kV cell series multi-level structure of the high voltage inverter using multiple automatic switching of a trailer for a frequency bypass overall control, and is equipped with overload, overcurrent, overvoltage, overheating protection. This paper also introduces the inverter in the actual field environment and daily operating conditions of the maintenance and overhaul program. Finally with the help of test data are calculated and analyzed, after the thermal power plant in 2 units cited fanfrequency conversion transformation, not only the fan performance has been the largest,and every year to save electricity 19.12 million kWh and 7.168 million yuan economic benefits.Studies draft fan of high voltage inverter in the application of thermal power plant helps to expand the variable frequency speed control technology in the scope of application of the power plant and accumulated in the actual production of converter installation maintenance operation experience,energy-efficient power plant provided efficiency improvement project for other high energy consuming equipment installation frequency conversion device provided the reference basis and energy saving data. |
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