Power-saving device for large-size power equipment

Abstract

The invention discloses a power-saving device and method for large-size power equipment. The power-saving device comprises a machine case, wherein a plurality of support frameworks are uniformly distributed in the machine case, an integrated control unit is arranged at one side of an upper part of each support framework, a control loop circuit box is arranged at one side of the integrated control unit, a proportional integral differentiation (PID) closed-loop detection extraction unit is arranged at the other side of the control loop circuit box, a speed regulation box is arranged at a lower side of the control loop circuit box, a power-saving main loop box is connected with a lower side of the speed regulation box, three groups of first connection lines are connected with a lower side of the power-saving main loop box, the other ends of the first connection lines are connected with a voltage stabilization unit, a line outlet of the voltage stabilization unit is connected with bypass control units through the three groups of first connection lines, a surge processing device is arranged at one side of the voltage stabilization unit, a reactive power compensation device is arranged at a lower side of the surge processing device, a line outlet of the reactive power compensation device is connected with a third connection line, and the other end of the third connection line is connected with a harmonic compensation device. By the power-saving device, harmonics can be eliminated, and power-saving operation is completed better.

Description

technical field [0001] The invention relates to the technical field of power-saving equipment, in particular to a power-saving device for large-scale power equipment. Background technique [0002] At present, the known equipment for saving power for large-scale electrical equipment is a frequency converter device. The frequency converter is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the motor's working power supply. The inverter is mainly composed of rectification, filtering, inverter, braking unit, drive unit, detection unit and micro-processing unit. The inverter adjusts the voltage and frequency of the output power supply by switching off the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. However, the frequency converter is also a large so...

AI Technical Summary

Problems solved by technology

However, the frequency converter is also a large source of harmonic generation. When the frequency converter is used to transform large-scale power equipment, it will cause the equipment to generate different levels of harmonic voltage and harmonic current during operation, so that ordinary asynchronous motors Running under non-sinusoidal voltage and current will cause a significant temperature rise of the electrical equipment, causing severe local overheating of the electrical equipment, affecting the service life of the equipment, until the electrical equipment is damaged

The harmonics generated by the frequency converter in the process of transformation will cause the resonance of the power grid, which may amplify the harmonic current several times or even dozens of times, which will pose a major threat to the system, especially for capacitors and reactors connected in series. It often burns it; so a new type of large-scale power-saving device is needed on the market

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