Three-machine set drive variable-frequency generation system

Abstract

The invention provides a three-machine set drive variable-frequency generation system, which aims at solving the problems of low mechanical speed regulation efficiency, high energy consumption and small application range of existing three-machine set drive. The three-machine set drive variable-frequency generation system comprises three machine sets and a frequency converter, wherein the three machine sets comprise a prime motor, a fan load and a motor. According to the technical main points of the three-machine set drive variable-frequency generation system, the prime motor, the fan load and the motor are coaxially connected with one another; the prime motor is connected with one end of the fan load; the other end of the fan load is connected with the motor; the frequency converter is arranged between the motor and a power grid; an input end of the frequency converter is connected with the power grid; an output end of the frequency converter is connected with the motor; rotating speed regulation is carried out on the three machine sets under the control of the frequency converter; and the three-machine set drive variable-frequency generation system comprises three working conditions of variable-frequency starting, normal operation and fault operation. The three-machine set drive variable-frequency generation system is simple in structural design; the drive efficiency and the operation reliability are improved; the residual mechanical energy and the rated capacity of equipment can be fully utilized; the functions such as rotating speed regulation, motor starting current reduction and power grid impact reduction are realized; the energy-saving effect is significant; and the application range is expanded.

Description

technical field [0001] The invention relates to a structure in which three sets use a frequency converter to drive a motor to realize electric and power generation operation, in particular to a three-unit transmission frequency conversion power generation system suitable for driving fan pump loads by a steam turbine / motor in a power plant. Background technique [0002] In recent years, as the country has intensified efforts in energy conservation and emission reduction, industries such as power plants, mines, metallurgy, and petrochemicals have carried out energy-saving renovations on existing equipment on the one hand, and built new equipment with higher efficiency and better energy-saving effects on the other hand. In the field of motor transmission, frequency converters are widely used in the occasions where the energy can be significantly saved by changing the speed of the motor. At the same time, the advantages of frequency converters, such as large starting torque, sma...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a three-unit transmission frequency conversion power generation system, which solves the problems of low mechanical speed regulation efficiency, large energy consumption, and small application range in the existing three-unit transmission. Its structure design is simple, and the transmission efficiency and operation are reliable It can make full use of the remaining mechanical energy and the rated capacity of the equipment, and realize the functions of speed adjustment, reduce the starting current of the motor and reduce the impact of the power grid. The energy saving effect is remarkable and the scope of application is broadened.

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