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Control system and method for reducing current distortion at boundary of three-phase Smith circuit

A current distortion and control system technology, applied in the direction of high-efficiency power electronic conversion, AC power input conversion to DC power output, electrical components, etc., can solve problems such as THD increase, phase current distortion, power factor reduction, etc., to achieve reduction Effects of current distortion, improving power factor, and reducing total harmonic distortion

Active Publication Date: 2021-03-19
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the switching point of the low-frequency tube, the phase current has obvious distortion, the THD increases, and the power factor decreases accordingly

Method used

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  • Control system and method for reducing current distortion at boundary of three-phase Smith circuit
  • Control system and method for reducing current distortion at boundary of three-phase Smith circuit
  • Control system and method for reducing current distortion at boundary of three-phase Smith circuit

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Embodiment Construction

[0052] The specific embodiment of the present invention is described now in conjunction with accompanying drawing

[0053] A kind of control system of the present invention that reduces current distortion at the boundary of three-phase Schweiss circuit comprises signal sampling and processing circuit, digital processing and control circuit and driving unit;

[0054] The signal sampling and processing circuit includes a voltage sampling and processing circuit, a current sampling and processing circuit; the voltage sampling and processing circuit includes three phase voltage sampling and processing circuits with the same structure and different input / output corresponding to the three-phase voltage Va , Vb, Vc, each phase voltage sampling and processing circuit includes an independent series resistor step-down network and an independent ADC chip, the input of the three-way phase voltage sampling and processing circuit is respectively connected to the three-phase input source Va, V...

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Abstract

The invention relates to a control system for reducing current distortion at the boundary of a three-phase Switch circuit and a control method thereof. The control system comprises a signal sampling and processing circuit, a digital processing and control circuit and a driving unit. The signal sampling and processing circuit comprises a voltage sampling and processing circuit and a current sampling and processing circuit; the digital processing and control circuit comprises a digital comparator 1, a digital comparator 2, a latch unit and a control unit, the digital comparator 1 and the digitalcomparator 2 take a digital computing unit as a core, and the driving unit receives a control signal from the control unit and drives three low-frequency bidirectional power tubes Qa, Qb and Qc. According to the invention, the phase value of the current lead voltage can be effectively obtained, the moment of entering the boundary region is detected according to the calculated value, and the current distortion of the boundary region is effectively reduced by optimizing the conduction state of the bidirectional harmonic injection switching tube, so that the power factor is improved.

Description

technical field [0001] The present invention relates to a control strategy, which uses digital control technology to alleviate the problem of serious current distortion at the boundary in three-phase Swiss and its extended topology, thereby reducing THD and improving power factor Background technique [0002] With the rapid development of power electronics technology, the power level of power supply equipment continues to increase, and the power factor requirements for electrical equipment are getting higher and higher. In order to reduce the pollution of high-order current harmonics to the grid and electrical equipment, reduce reactive power, and improve grid utilization efficiency, various topologies including PFC functions have emerged as the times require. In recent years, the three-phase PFC topology and its control strategy have been continuously developed and improved, and are more and more widely used in high-power applications. [0003] The three-phase Swiss topolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M1/12H02M7/219
CPCH02M1/4216H02M1/4233H02M1/12H02M7/219Y02B70/10
Inventor 钱钦松毛世源许胜有杨兰兰孙伟锋时龙兴
Owner SOUTHEAST UNIV
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