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Modulation strategy for loss balance of three-level ANPC converter

A technology of loss balance and converter, which is applied in the direction of converting AC power input to DC power output, electrical components, high-efficiency power electronic conversion, etc., and can solve problems such as short service life and unbalanced loss of power devices

Active Publication Date: 2020-06-19
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a modulation strategy for three-level ANPC converter loss balance, to solve the existing problems of short service life of each switching device and unbalanced loss of each power device

Method used

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  • Modulation strategy for loss balance of three-level ANPC converter
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  • Modulation strategy for loss balance of three-level ANPC converter

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Embodiment

[0162] Such as figure 1 The schematic diagram of the active clamp type three-level converter in the present invention is shown as shown, including the three-phase AC part (if it is a three-level inverter structure, the three-phase AC part is the load), the three-phase AC part The external part of the flat DC side (if it is a three-level inverter structure, the external part of the DC side is a DC voltage source, which can be an actual power source or a DC source obtained by rectifying an AC power source;), three electric The main circuit part of the flat ANPC converter, voltage sensor, current sensor, A / D conversion chip and digital processor, among which, the voltage sensor detects the voltage of the three-phase AC part and the voltage of each capacitor on the DC side, and the current sensor detects the current of each phase on the AC side , the voltage sensor and the current sensor are connected with the digital processor through the A / D conversion chip, and the digital proc...

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Abstract

The invention discloses a modulation strategy for the loss balance of a three-level ANPC. The modulation strategy is specifically implemented according to the following steps: 1, obtaining three-phasemodulation waves according to a carrier pulse width modulation method, and then solving and outputting a, b and c three-phase switching states and respective action time thereof through a space vector pulse width modulation strategy; 2, adopting seven-stage wave generation and calculating the conduction time of each region, and performing commutation control on a three-level ANPC rectifier; and 3, analyzing the switching loss generated by a current conversion mode, and proposing a converter loss balance strategy. The invention aims to provide the modulation strategy for the loss balance of the three-level ANPC converter, and the problems of short service life of each switching device and unbalanced loss of each power device in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of power electronics and relates to a modulation strategy for loss balance of a three-level ANPC converter. Background technique [0002] Multilevel topology is a more practical solution in high voltage and high power applications. However, as the number of levels increases, the difficulty of control gradually increases. The three-level topology is currently one of the most widely used multi-level topologies, but the traditional three-level neutral point clamped (Neutral Point ClamPed, NPC) topology has the problem of unbalanced loss distribution. Accordingly, the Active Neutral Point ClamPed (ANPC) topology has emerged, which can effectively control the loss balance of the device by selecting redundant switch states and different current paths, but this topology is often compared with traditional For the three-level NPC topology, two power devices are added, so the modulation and control are more complica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M7/5387H02M7/5395
CPCH02M7/487H02M7/53875H02M7/5395H02M1/0054H02M7/53876Y02B70/10
Inventor 李宁田博文陈创曹裕捷李洁聂程
Owner XIAN UNIV OF TECH
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