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Control of the Neutral Leg in Three-Phase Four-Wire Inverter Using Proportional-Resonant Controller

PR 제어기를 이용한 3상 4선식 인버터 Neutral Leg 제어 방법

  • Han, Jungho (Dept. of Railway Electrical and Signaling Engineering, Seoul National University of Science and Technology) ;
  • Song, Joongho (Dept. of Electrical and Information Engineering, Seoul National University of Science and Technology)
  • Received : 2014.10.21
  • Accepted : 2014.12.17
  • Published : 2015.02.28

Abstract

In 3-phase 4-wire inverter, the unbalanced loads cause to increase the neutral current which brings the voltage deviation between the split dc-link capacitors to be larger. In order to solve this problem, a neutral leg is provided additively to the ordinary inverter circuit and the associated control methods are devised. This paper proposes a new neutral-leg controller based on a PR controller and shows relatively good performance even under unbalanced linear loads and nonlinear loads. The proposed control strategy illustrates its effectiveness under the various operating conditions through simulation works.

Keywords

Three-Phase Four-Wire Inverter;Dc-Link Balancing Control;Proportional-Resonant Control

Acknowledgement

Supported by : 서울과학기술대학교

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