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A Bipolar AC-AC Converter Topology and Modulation Method

A bipolar, converter technology, applied in the direction of converting AC power input to AC power output, output power conversion devices, electrical components, etc., can solve the problems of low utilization rate of converter modulation ratio and unipolar voltage output, etc. , to achieve the effect of improving conversion efficiency, improving reliability and reducing the number of power transmission stages

Active Publication Date: 2020-11-13
NORTHEAST DIANLI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a bipolar dual-buck type direct AC-AC converter topology, which solves the inherent commutation problem, unipolar voltage output problem and converter of the existing AC-AC converter structure. The problem of low modulation ratio utilization caused by the need to set dead time

Method used

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  • A Bipolar AC-AC Converter Topology and Modulation Method
  • A Bipolar AC-AC Converter Topology and Modulation Method
  • A Bipolar AC-AC Converter Topology and Modulation Method

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Embodiment

[0064] It can be seen from the output of the positive and negative bridge arms of the topology structure of the present invention that there are various schemes for controlling the output bipolar voltage. Here is a special example when d 1 = d 1x , d 2 = d 2x and d 1 >d 2 When , the actions of each switch tube are as follows: image 3 Shown:

[0065] The working principle of the output positive polarity voltage of this structure is analyzed as follows:

[0066] a) When the AC positive half-wave is input, working stage 1: such as Figure 4 As shown, the full-controlled power switch tube T of the positive bridge arm 2 , full-control power switch tube T 2c Normally open, fully controlled power switch tube T 1 Turn-on, full-control power switch tube T 1c Turn off, fully controlled power switch tube T of negative polarity bridge arm 2 , full-control power switch tube T 2c Normally open, fully controlled power switch tube T 1p Turn off, fully controlled power switch tu...

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Abstract

The invention discloses a topology structure of a bipolar AC-AC converter, comprising a single-phase system AC power supply, a dual-buck power conversion unit, an LC low-pass filter unit and a signal control unit. The power conversion unit includes a positive polarity bridge arm and a negative polarity bridge arm, the output end A of the positive polarity bridge arm and the output end B of the negative polarity bridge arm are connected to the LC low-pass filter, and the output end of the LC low-pass filter is connected to the load . The converter of the present invention can better output the voltage in the same phase or in the opposite phase with the input voltage, and works in the same buck / boost working mode when the output voltage is in the same phase or in the opposite phase with the input voltage, so that the conversion The device can maintain the continuous current on the output side without using large-capacity capacitors. The invention also discloses a modulation method of the structure, which enables the least number of switching tubes to perform high-frequency switching actions in each half cycle of the input voltage, thereby reducing the total switching loss and improving the efficiency of the converter.

Description

technical field [0001] The invention belongs to the technical field of electric energy conversion, and specifically relates to a bipolar dual-buck type direct AC-AC converter topology, and also relates to a bipolar dual-buck type direct AC-AC converter topology modulation method. Background technique [0002] Voltage is one of the core indicators of power quality, and its stability plays a vital role in both the safe and stable operation of the power system and the normal operation of user-side electrical equipment. With the continuous increase of the grid-connected capacity of renewable energy represented by distributed photovoltaics and wind power, the power flow of the original power grid is changed, and the reverse flow of the power flow may occur, causing the grid overvoltage problem; in addition, the load The continuous increase is easy to cause the problem of low voltage. With the continuous development of technology, sensitive loads represented by high-precision ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/293
CPCH02M5/293H02M5/2932
Inventor 刘闯蔡国伟汪鹏郭东波王艺博
Owner NORTHEAST DIANLI UNIVERSITY
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