Control strategy for microgrid under three-phase unbalance condition

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• 作者：Hongtao SHI ; Fang ZHUO ; Hao YI ; Zhiqing GENG
• 关键词：Microgrid ; Inverter ; Three ; phase unbalance ; Negative compensation
• 刊名：Journal of Modern Power Systems and Clean Energy
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：4
• 期：1
• 页码：94-102
• 全文大小：3,517 KB
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• 作者单位：Hongtao SHI (1)
  Fang ZHUO (1)
  Hao YI (1)
  Zhiqing GENG (1)
  
  1. School of Electrical Engineering, Xi’an Jiaotong University, Xi’an, 710000, China
  
• 刊物主题：Energy Systems; Renewable and Green Energy; Power Electronics, Electrical Machines and Networks;
• 出版者：Springer Berlin Heidelberg
• ISSN：2196-5420

文摘

Microgrid (MG) is generally developed at utility terminal which contains lots of unbalanced loads and distributed generations (DGs). The interaction between MG and the unbalance loads or DGs will degrades the control performance of interfaced inverter in MG and dramatically leads to MG voltage unbalance. In this paper, a negative-sequence compensation based three-phase voltage unified correction strategy is proposed. While MG operates in islanded mode, a positive virtual impedance control is used to eliminate the negative voltage resulted from the negative-sequence current, and then a positive-sequence voltage control loop and negative-sequence control loop are used to improve the inverter control performance. While MG operates in grid-tied mode, the inverter operates as a negative-sequence current source to compensate the negative-sequence currents of loads to guarantee the point of common coupling (PCC) voltage balance. By using the proposed strategy, the voltage control performance of inverter can be improved; the MG power quality can be enhanced significantly. Simulation and experimental results verify the effectiveness of the proposed method. Keywords Microgrid Inverter Three-phase unbalance Negative compensation