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논문 기본 정보

자료유형
학술저널
저자정보
Hongpeng Liu (Harbin Institute of Technology) Jiajie Zhou (Harbin Institute of Technology) Wei Wang (Harbin Institute of Technology) Dianguo Xu (Harbin Institute of Technology)
저널정보
전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.18 No.4
발행연도
2018.7
수록면
1,245 - 1,254 (10page)

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초록· 키워드

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The stability of a grid-connected system (GCS) has become a critical issue with the increasing utilization of renewable energy sources. Under grid faults, however, a grid-connected inverter cannot work efficiently by using only the traditional droop control. In addition, the unbalance factor of voltage/current at the common coupling point (PCC) may increase significantly. To ensure the stable operation of a GCS under grid faults, the capability to compensate for grid imbalance should be integrated. To solve the aforementioned problem, an improved voltage-type grid-connected control strategy is proposed in this study. A negative sequence conductance compensation loop based on a positive sequence power droop control is added to maintain PCC voltage balance and reduce grid current imbalance, thereby meeting PCC power quality requirements. Moreover, a stable analysis is presented based on the small signal model. Simulation and experimental results verify the aforementioned expectations, and consequently, the effectiveness of the proposed control scheme.

목차

Abstract
I. INTRODUCTION
II. VECTOR ANALYSIS OF VOLTAGE AND CURRENT UNDER AN UNBALANCED GRID CONDITION
III. ANALYSIS DROOP CONTROL IN GRID-CONNECTED MODE
IV. IMPROVED VOLTAGE-TYPE UNBALANCE COMPENSATION CONTROL
V. SIMULATION AND EXPERIMENTAL RESULTS
VI. CONCLUSIONS
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