|Table of Contents|

 Control strategy of three-phase four-leg inverter using an auxiliary triangle waveform

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[ISSN:1007-449X/CN:23-1 408/TM]

Issue:
2016年01
Page:
14-21
Research Field:
Publishing date:

Info

Title:
 Control strategy of three-phase four-leg inverter using an auxiliary triangle waveform

Author(s):
 MA Hai-xiao1 YE Hai-yun1 GONG Chun-ying2

 ( 1. College of Automation Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China; 2. College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
Keywords:
 three-phase four-leg inverter triangle waveform double closed loop control symmetrical component method zero sequence harmonic
PACS:
TM 464
DOI:
10. 15938 /j. emc. 2016. 01. 003
Abstract:
The common control methods of Three-phase four-leg inverter are open loop control or need a lot of tedious calculation. These methods are not fit for medium-high frequency inverters,which require higher dynamic and static performance. In order to overcome these shortcomings,a control strategy of Three-Phase Four-Leg inverter using an auxiliary triangle waveform was proposed. This control strategy was based on voltage-current double closed loop control principle. Through establishing the voltage and current equations of Three-phase four-leg inverter and deriving the conditions of ensuring the symmetry of three-phase output voltages,the important roles of triangle waveform were found to control all the legs. In this strategy,the first three legs adopted voltage-current double closed loop control method with a triangle wave injection. The modulation ratio could be greater than one,so it can improve the utility ratio of DC voltage. The fourth leg adopted Pulse Width Modulation control method using a composed triangle wave as the modulation signal. The control of this leg ensured that three-phase output voltages were symmetrical when the inverter supply unbalanced loads. A 6kVA prototype was designed. The results of simulation and experiment proved the feasibility of this control strategy.

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Last Update: 2016-03-21