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Advanced Synchronous Reference Frame Controller for three-Phase UPS Powering Unbalanced and Nonlinear Loads  

Hyun Dong-Seok (한양대 전기공학과)
Kim Kyung-Hwan (한양대 대학원 전기공학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.10, no.5, 2005 , pp. 508-517 More about this Journal
Abstract
This paper describes a high performance voltage controller for 3-phase 4-wire UPS (Uninterruptible Power Supply) system, and proposes a new scheme of synchronous reference frame controller in order to compensate for the voltage distortions due to unbalanced and nonlinear loads. Proposed scheme can eliminate the negative sequence voltage component due to unbalanced loads and also reduce the harmonic voltage component due to non-linear loads, even when the bandwidth of voltage control loop is a very low. In order to compensate for the effects of unbalanced loads, the synchronous reference frame controller with the positive and negative sequence computation block is proposed, and the synchronous frame controller with a bandpass filter is proposed to compensate for the selected harmonic frequency of output voltage. The effectiveness of the proposed scheme has been investigated and verified through computer simulations and experiments by a 30kVA UPS.
Keywords
Three phase inverter; Voltage controller; UPS; Unbalance and nonlinear load; Control bandwidth; Synchronous reference frame; Voltage distortion;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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