Distributed Tie-Line Power Flow Control of Autonomous DC Microgrid Clusters

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Abstract
For microgrids owned by different utilities, it is always desirable that the steady state impact of load or generation changes in one microgrid, does not affect the generation cost in another microgrid. To ensure this, the power flow through the tieline is typically regulated at a pre-scheduled value thereby enforcing the individual microgrids to manage their respective load at steady state. To this end, this paper presents a distributed control scheme to regulate tie-line power flow between two autonomous dc microgrid clusters. In this work, a unifying hierarchical control scheme based on distributed communication is proposed where the tie-line power flow control based on a pinning control strategy is unified with the distributed optimization and average voltage regulation control loops. The distributed optimization utilizes economic dispatch to minimize the operating costs of the DG, while the average voltage control regulates the microgrid's average voltage at its nominal value. With the application of this approach, the responsibility of tie-line regulation is distributed in an economic manner without degrading the voltage quality in the system. Time-domain simulations, real-time simulation using Eternet based TCP/IP communication and experimental results are presented to validate the performance of proposed distributed control under normal and faulty system conditions.
Funding Information
  • Department of Science and Technology, Government of India
  • Identification and Demonstration of Cost-effective Technologies to Maximize Habitat Energy self-sufficiency (TMD/CERI/BEE/2016/096(G))

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