Induced Draft Fans case - INVT GD5000 Series High Voltage Inverter

INVT GD5000 Series High Voltage Inverter Applied in Induced Draft Fans in a Power Plant of China Power Investment Corporation

With the development of economy, contradiction of resource limitation has become more and more serious. Establish an energy-saving society, upgrade technology to save energy and reduce consumption are the development directions for all power generation enterprises. The operation result proves that the application of high voltage inverter technology in auxiliary engines in heat-engine plant is of great technology performance and significant economic benefit as well as good promotion value.

Power plant is not only an electric energy producer but also a user and a consumer of electric energy. In the composition of power supply energy in China, thermal power accounts for over 70%. While for the general thermal power generating units, they account for the power generation of 4% to 7%. To drive large capacity fans and water pump auxiliary engines in high voltage factory, the electric motors need to consume 80% of total electricity amount in the factory. Because of the emergence of separation of plant and network and price bidding in electricity system reform, coal consumption of electricity generation and auxiliary power rate in the factory have become important indicators for power factory performance appraisal, which is related to economic benefit and competitive of an enterprise. And energy-saving effect of variable speed control of fan machine and water pump auxiliary engine can significantly reduce factory power consumption and decrease electricity generating cost. Therefore, choosing a proper high voltage factory electric motor speed control system has become the top priority for power plant energy-saving work.

The energy saving effect was very remarkable and the starting frequency was low, the speed was low, the current was small and smooth after the variable frequency upgrading of the induced draft fan, which achieved a soft start and avoided large current impact and high torque influence that the old power frequency brings to motor, cables, switches and mechanical equipment. The application of variable frequency inverter not only extends the life of the motor and other equipment, but also reduces bearing wear and improves the reliability of safe power supply.