Distributed Control Strategy for DC Microgrids of Photovoltaic Energy Storage Systems in Off-Grid Operation

Mingxuan Chen, Suliang Ma, Haiyong Wan, Jianwen Wu and Yuan Jiang
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Mingxuan Chen: School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
Suliang Ma: School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
Haiyong Wan: School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
Jianwen Wu: School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
Yuan Jiang: School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China

Energies, 2018, vol. 11, issue 10, 1-19

Abstract: DC microgrid systems that integrate energy distribution, energy storage, and load units can be viewed as examples of reliable and efficient power systems. However, the isolated operation of DC microgrids, in the case of a power-grid failure, is a key factor limiting their development. In this paper, we analyze the six typical operation modes of an off-grid DC microgrid based on a photovoltaic energy storage system (PV-ESS), as well as the operational characteristics of the different units that comprise the microgrid, from the perspective of power balance. We also analyze the key distributed control techniques for mode transformation, based on the demands of the different modes of operation. Possible reasons for the failure of PV systems under the control of a voltage stabilizer are also explored, according to the characteristics of the PV output. Based on this information, we propose a novel control scheme for the seamless transition of the PV generation units between the maximum PV power tracking and steady voltage control processes, to avoid power and voltage oscillations. Adaptive drooping and stabilization control of the state of charge of the energy storage units are also considered, for the protection of the ESS and for reducing the possibilities of overcharging and/or over-discharging. Finally, various operation conditions are simulated using MATLAB/Simulink, to validate the performance of the proposed control strategy.

Keywords: PV-ESS; microgird; operation mode; PV system; seamless transfer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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