A three-phase DC high voltage power supply intermittent power supply circuit for electrostatic precipitator

Abstract

The invention relates to a three-phase DC high-voltage intermittent power supply circuit for electric dust removal, which includes a main circuit, the main circuit includes a three-phase bridge rectifier circuit composed of six thyristors, and a microcomputer controller; the microcomputer controller Connected to the main circuit, collect the three-phase synchronous signal of the main circuit and the voltage and current signals output by the main circuit, obtain the delayed firing angle signals of six thyristors based on the voltage and current signals, and according to the three-phase Obtain the respective synchronous signals of the six thyristors with the phase synchronous signal; obtain the respective trigger pulse signals of the six thyristors based on the synchronous signal and the delayed trigger angle signal; send the respective trigger pulse signals of the six thyristors to the corresponding thyristors respectively In order to realize the intermittent power supply of the three-phase DC high-voltage power supply for electrostatic precipitator. The invention realizes the intermittent power supply of the three-phase DC high-voltage power supply for electric dust removal by separately adjusting the output of the trigger pulse signals of the six thyristors.

Description

technical field [0001] The invention relates to the technical field of electric dust removal power supply, and more specifically relates to an intermittent power supply circuit of a three-phase DC high-voltage power supply for electric dust removal. Background technique [0002] Three-phase high-voltage silicon rectifier power supply, which uses three-phase grid power input directly, three-phase thyristor full-control phase-shift voltage regulation, boosted by a three-phase transformer, and obtains a 0-150KV high-voltage DC signal after secondary rectification. Widely used in coal-fired power plants, steel, cement, building materials and other dust removal systems. The existing three-phase DC high-voltage power supply output mode for dust removal mostly adopts full-wave three-phase balanced output, and then adjusts the output voltage and output power by controlling the size of the trigger angle. However, because the environmental protection department is becoming increasing...

AI Technical Summary

Problems solved by technology

However, because the environmental protection department is becoming increasingly strict on dust removal and emission, the existing full-wave power supply method cannot meet the emission requirements. Increasing the output power can indeed improve the dust removal efficiency under certain dust removal conditions, but when the output power increases to a certain value, the dust removal effect increases. Significantly weakened, in the dust removal system such as medium and high specific resistance, it will reduce the dust removal effect

Therefore, the existing power supply method not only wastes energy, but also fails to meet the requirements under certain working conditions.

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