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논문 기본 정보

자료유형
학술저널
저자정보
Yaoqin Jia (Xi’an Jiaotong University) Daoyang Li (Xuji Group Corporation) Zhen Chen (Xi’an Jiaotong University)
저널정보
전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.19 No.1
발행연도
2019.1
수록면
234 - 243 (10page)

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초록· 키워드

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Studying the control strategy of a microgrid under the load unbalanced state helps to improve the stability of the system. The magnitude of the power fluctuation, which occurs between the power supply and the load, is generated in a microgrid under the load unbalanced state is called negative sequence reactive power Ǫ⁻. Traditional power distribution methods such as P-f, Q-E droop control can only distribute power with positive sequence current information. However, they have no effect on Ǫ⁻ with negative sequence current information. In this paper, a stationary-frame control method for power sharing and voltage unbalance compensation in islanded microgrids is proposed. This method is based on the proper output impedance control of distributed generation unit (DG unit) interface converters. The control system of a DG unit mainly consists of an active-power-frequency and reactive-power-voltage droop controller, an output impedance controller, and voltage and current controllers. The proposed method allows for the sharing of imbalance current among the DG unit and it can compensate voltage unbalance at the same time. The design approach of the control system is discussed in detail. Simulation and experimental results are presented. These results demonstrate that the proposed method is effective in the compensation of voltage unbalance and the power distribution.

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Abstract
Ⅰ. INTRODUCTION
Ⅱ. INNER CONTROL DESIGN
Ⅲ. TRADITIONAL DROOP CONTROL
Ⅳ. Q-Z CONTROL
Ⅴ. SIMULATION RESULTS
Ⅵ. EXPERIMENTAL RESULTS
Ⅶ. CONCLUSIONS
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