Abstract : This paper compares and analyzes the energy consumption of high-voltage frequency converter speed regulation with traditional speed regulation methods, proving that the high-voltage frequency converter speed regulation has significant energy-saving effect and has great promotional value for the selection of high-voltage frequency converters.
Keywords : thermal power plant, high-voltage frequency converter, energy saving analysis
introduction
Currently, major electrical equipment in thermal power plants generally suffers from severe energy waste. Equipment such as induced draft fans, forced draft fans, and feedwater pumps consume a significant amount of electricity. These devices require constant flow rate adjustments as the unit load changes, but the output power of their drive motors cannot be adjusted accordingly, resulting in substantial energy losses. Traditionally, there are two methods for adjusting fan and pump flow rates: one involves changing the opening of dampers or valves, which requires the fan to operate at full power, leading to low efficiency and rapid fan damage. The other method involves changing the motor speed, previously primarily using hydraulic couplings. This method also suffers from low efficiency, poor accuracy, and unreliable operation.
High-voltage frequency converters , as a new type of AC drive, are favored by power companies due to their advanced technology, wide speed range, high speed control accuracy, significant energy saving effect, reliable operation and high degree of automation. They are a good way for thermal power plants to save energy, reduce consumption and improve their competitiveness in the grid.
1. Energy-saving principle of high-voltage frequency converters
The speed n of an AC asynchronous motor is related to the power supply frequency f, the slip S, and the number of pole pairs P of the motor.
For details, please click: Discussion on the Energy-Saving Principle of High-Voltage Frequency Converters
