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Mixing clamping type five-level current transformer and control method thereof

A technology of mixed clamping and control methods, which is applied in the direction of adjusting electric variables, control/regulating systems, converting DC power input to DC power output, etc., can solve the problems of increasing system hardware complexity and cost, and improve voltage utilization , Simple and easy to achieve, easy to digitally realize the effect

Active Publication Date: 2013-08-21
中科海奥(黄山)储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this hybrid clamp topology increases the hardware complexity and cost of the system due to the introduction of devices such as clamp switches and clamp capacitors.

Method used

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  • Mixing clamping type five-level current transformer and control method thereof
  • Mixing clamping type five-level current transformer and control method thereof
  • Mixing clamping type five-level current transformer and control method thereof

Examples

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Embodiment Construction

[0025] see figure 1 , a hybrid clamp-type five-level converter, including three single-phase bridge arms with the same structure, where each phase bridge arm includes: 2 DC bus capacitors C 1 、C 2 ; 2 clamping capacitors C 3 、C 4 ; 4 main switch tubes S 1 , S 2 , S 1’ , S 2’ and 8 clamp switches S c1 , S c2 , S c1’ , S c2’ , S c3 , S c4 , S c3’ , S c4’ ; 2 clamping diodes D c1 and Dc2 ;

[0026] Among them, the DC bus capacitor C 1 and C 2 It is shared by each phase bridge arm;

[0027] The DC link capacitor C 1 and C 2 are connected in series with each other to form a DC bus capacitance branch; the clamping switch tube S c1 , S c2 , S c1’ and S c2’ are connected in series with each other to form the first clamping switch tube branch, and the clamping switch tube S c3 , S c4 , S c3’ and S c4’ are connected in series to form a second clamping switching tube branch; the clamping capacitor C 3 and C 4 connected in series to form a clamping capacitor ...

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Abstract

The invention discloses a mixing clamping type five-level current transformer and a control method of the mixing clamping type five-level current transformer. Six chained type branches of a direct-current bus capacitance branch, two clamping switching tube branches, a clamping capacitance branch, a clamping diode branch and a main switching tube branch are formed by four capacitors, twelve switching tubes and two clamping diodes of a single-phase bridge arm. A harmonic elimination PWM method is adopted to obtain a level section signal and a level signal, a switching state of the switching tubes is directly obtained through the obtained level section signal and the obtained level signal according to a preset switching state, dead zones are added among switching elements which are mutually complemented and conducted, and PWM driving signals of the twelve single-phase switching tubes are obtained. The mixing clamping type five-level current transformer and the control method of the mixing clamping type five-level current transformer have the advantages of outputting in a boosting mode, achieving balance of all capacitor voltage periods once by only needing two carrier periods, lowering switching frequency of a main switching tube, being simple in implement method and the like.

Description

technical field [0001] The invention relates to a power electronic converter, in particular to a hybrid clamp type five-level converter and a control method thereof. Background technique [0002] Due to the increase in the number of output levels, multilevel converters have the advantages of low harmonic content in output waveforms and small voltage stress on devices. These advantages make multilevel converter technology especially suitable for high-voltage and large-capacity power electronics applications. At present, multilevel converters can be mainly divided into the following three types: diode-clamped, capacitor-clamped, and H-bridge cascaded. Among them, the diode-clamped multilevel topology has become the most widely used multilevel topology due to its simple and reliable main circuit structure and bidirectional energy flow. However, there is a problem of DC capacitor voltage balance in this topology. For the three-level topology, it can be solved by a certain contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M7/5387H02M3/155H02M1/088
CPCH02M7/487H02M1/007
Inventor 张兴任康乐王付胜谢韦伟
Owner 中科海奥(黄山)储能科技有限公司
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