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Line voltage cascaded three-phase diode high-power factor converter and control strategy thereof

A technology with high power factor and control strategy, applied in the direction of converting AC power input to DC power output, output power conversion device, high-efficiency power electronic conversion, etc., can solve the problem of no obvious advantages, and achieve convenient control and low switching loss , the effect of simple structure

Pending Publication Date: 2019-07-23
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of converter has no obvious advantages in the field of energy-saving speed regulation of fans and pump motors that do not require energy feedback, which is also one of the key factors restricting the practical use of this type of converter

Method used

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  • Line voltage cascaded three-phase diode high-power factor converter and control strategy thereof
  • Line voltage cascaded three-phase diode high-power factor converter and control strategy thereof
  • Line voltage cascaded three-phase diode high-power factor converter and control strategy thereof

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Embodiment Construction

[0045] Embodiment and working principle of the present invention are further described below in conjunction with accompanying drawing:

[0046] Such as image 3 As shown, the three-phase line voltage cascaded three-phase diode high power factor converter of the present invention includes a two-stage cascaded structure, and is characterized in that three three-phase diode high power factor converter modules pass through the line voltage stage on the input side join together;

[0047] The three-phase diode high power factor converter module such as figure 2 shown, including the three-phase diode rectifier bridge, the boost inductor L K (K=1,2,3) and N power switch units, where N is a positive integer;

[0048] The three-phase diode rectifier bridge includes 6 ordinary diodes D aK+ 、D bK+ 、D cK+ and D aK- 、D bK- 、D cK- (K=1,2,3), wherein, the cathode of the diode of the lower bridge arm in each phase bridge arm is connected in series with the anode of the diode of the up...

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Abstract

The invention discloses a topological structure of a line voltage cascaded three-phase diode high-power factor converter and a control strategy of the topological structure, and belongs to an AC / DC converter. The converter comprises three three-phase diode high-power factor converter modules with cascaded line voltages, wherein each module is composed of a three-phase diode rectifier bridge, a boost inductor and N power switch units. The purposes of reducing the voltage stress of a switch tube and improving the voltage application level are achieved by utilizing a line voltage cascading connection mode and a power switch unit cascading mode, so that the converter can be applied to high-voltage and high-power occasions; according to the circuit topology provided by the invention, the wholesystem can truly realize unit power factor operation; and the number of used fully-controlled power switching devices is reduced to the maximum extent, so that the manufacturing cost, the size, the switching loss and the control complexity of the converter are effectively reduced.

Description

technical field [0001] The present invention relates to a novel circuit topology and control strategy of an AC / DC converter, in particular to a three-phase cascaded line voltage that can be applied to high-voltage and high-power occasions and can supply power to multiple loads at the same time. Diode high power factor converter. Background technique [0002] In recent years, "Multilevel Converter" (Multilevel Converter) has been successfully applied in the fields of high voltage and high power frequency conversion speed regulation, active power filter, high voltage direct current (HVDC) transmission and power system reactive power compensation. The basic circuit topology of multilevel converters can be roughly divided into two categories: clamping type and unit cascading type: such as the diode clamping type three-level converter produced by Siemens or ABB which is widely used in industry. Medium and high voltage inverters, and cascaded H-bridge medium and high voltage inve...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M1/42
CPCH02M7/217H02M1/4216Y02B70/10
Inventor 王聪程红刘霞田长庚孔佳仪陈婷赵志浩邹甲卢其威
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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