Mine main ventilation fan high-voltage inverter device with energy feedback

Abstract

The invention discloses a mine main ventilation fan high-voltage inverter device with energy feedback. The mine main ventilation fan high-voltage inverter device comprises a pulse-width modulation (PWM) rectifier, a current source type high-voltage inverter and a PWM inverter, the input end and the output end of the current source type high-voltage inverter are respectively connected with the PWM rectifier and the PWM inverter, the output end of the PWM inverter is connected with a main ventilation fan, and simultaneously alternating current power output by the PWM inverter is fed back to a power grid to achieve feedback of electric energy. Electric energy output by the power grid is converted by a special power supply to supply power for the PWM rectifier and the main ventilation fan M. The mine main ventilation fan high-voltage inverter device adjust the voltage of the PWM rectifier and the PWM inverter through PWM technology, accordingly removes an input transformator and an output transformator and achieves purposes of simplifying system structures and improving system operation efficiency and reliability.

Description

technical field [0001] The invention relates to a frequency conversion speed regulating device for a coal mine main ventilator, in particular to a high-voltage frequency conversion device for a mine main ventilator with energy feedback. Background technique [0002] At present, the main ventilator in coal mines mainly adopts high-voltage AC frequency conversion speed regulation technology. By changing the frequency, the speed of the main ventilator is adjusted in real time, so that the main ventilator always runs in the high-efficiency zone. After more than 20 years of development of AC frequency conversion speed regulation technology, the commonly used solution is the "high-low-high" type high-voltage inverter using a step-down transformer, that is, an indirect high-voltage frequency conversion device. The input step-down transformer, the output step-up Composed of transformers and low-voltage frequency converters. Due to the use of two transformers for input and output in...

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Problems solved by technology

Due to the use of two transformers for input and output in this scheme, the system structure is complicated, the reliability is reduced, and the operating efficiency of the system is reduced, which affects the energy saving effect.

Moreover, the low-voltage frequency converter used in this scheme is a voltage source type frequency converter, which can only conduct in one direction. Therefore, it is necessary to use pairs of anti-parallel switching devices. The number of devices used is large, which affects the reliability of the system and the output waveform. The output waveform contains More high-frequency components, the damage to the follow-up equipment (main fan) is more obvious, affecting the service life, and the heat and noise are more serious

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