Consensus-Based Distributed Control for Photovoltaic-Battery Units in a DC Microgrid

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Abstract
In this paper, a distributed cooperative control scheme, considering the State of Charge (SoC) balance and power limits of Battery Storage Units (BSUs) in the consensus protocol, is proposed to achieve average bus voltage consensus in a DC microgrid with photovoltaics (PVs). The state variable defined in the consensus protocol enables all BSUs to charge or discharge together without introducing circulating currents among BSUs. Furthermore, by incorporating power limits of BSUs in the defined state variable, power violation of the BSUs can be prevented. The consensus-based distributed control only utilizes neighbor-to-neighbor communication to realize the global consensus and thus avoids the single point of failure compared to the conventional centralized control. Simulation and experimental results demonstrate the efficacy of the proposed method in an islanded DC microgrid under different testing scenarios.
Funding Information
  • National Basic Research Program of China (2017YFB0903601)
  • National Natural Science Foundation of China (51607075)

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