Energy management and control strategy for DC microgrid based on DMPPT technique

Abstract

In a conventional photovoltaic (PV) DC microgrid system, mismatches among the PV modules due to partial shading will cause power loss. The distributed maximum power point tracking (DMPPT) can effectively solve the mismatch problem and achieve high-efficiency power output. This study proposes a maximum power range estimation method based on the DMPPT technique, which can provide guidance for designing parameters. Moreover, in order to realise seamless switching between different operation modes and ensure the stability of the DC microgrid, this study proposes a modified energy management and control strategy based on the hierarchical method. Simulation and experiment results indicate that the proposed control strategy for the DC microgrid based on the DMPPT technique can switch flexibly among different operation modes of the system, with a variation of environmental conditions and battery states, ensuring the stable bus voltage as well as safe operation.