A Decentralized Control Method for Islanded Microgrids Under Unbalanced Conditions

作者：Golsorkhi Mohammad S^*; Lu Dylan Dah Chuan

来源：IEEE Transactions on Power Delivery, 2016, 31(3): 1112-1121.

DOI：10.1109/TPWRD.2015.2453251

• Distributed energy resources (DERs)
• droop control
• microgrids
• model predictive control
• overcurrent
• unbalanced load
• V-I droop

Unbalanced load currents not only give rise to unbalanced voltages but also adversely affect the performance of the conventional current-limiting mechanisms. The latter might result in overcurrent stress on the distributed energy resources (DERs) or current harmonics. In this paper, a novel decentralized control method is proposed to improve the power quality and protect DERs from overload. The proposed controller makes use of the model predictive control (MPC) technique to minimize the voltage unbalance, improve current limiting, and prevent active power overload. The MPC is combined with the V-I droop method to realize coordinated operation with fast dynamic response. The proposed method is tested on the CIGRE benchmark microgrid. Simulation results demonstrate that the proposed method improves power quality but also allows for operation close to the maximum load capacity without imposing DERs to overload.

• 出版日期2016-6