Control of photovoltaic‐based low‐voltage dc microgrid system for power sharing with modified droop algorithm

Abstract

This study discusses a droop-based proportional load sharing control of parallel connected dc-dc converters in photovoltaic (PV)-based low-voltage dc microgrid. Droop control is the popular scheme for power sharing in dc microgrid. In this study, proportional droop index (PDI) algorithm with droop (R droop) shifting is introduced to improve the load sharing performance of the dc microgrid, which is a function of normalised current sharing difference and voltage deviation in the output side of the converters. This proposed control method calculates adaptive virtual resistance, R droop , and allows the converter to share the load current based on PV power available. By incorporating a new R droop shifting method with PDI, the proposed scheme eliminates the trade-off between current sharing and voltage regulation of the conventional method. The detailed analysis and design procedures are explained, and the effectiveness of the proposed method is verified by detailed simulation and experimental studies.

Effective Management System for Solar PV Using Real-Time Data with Hybrid Energy Storage System

“…The major problems associated with parallel operation of DC-DC converters are proper power-sharing, maximum power tracking for RESs, power loss in the converters, managing energy storage devices, voltage regulation, etc. [11]. µGs have a common advantage to collaborate and exchange control locally inside the given system.…”

Research and Design of Inverter Applied in Solar PV Systems Connected to Distribution Grid

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“…More importantly, most of these methods have focused on seamless transfer for either only a single renewable system or the master unit in a hierarchical system. For paralleled systems, they may have to incorporate droop control, which by far, has been widely utilized for enhancing load sharing and stability when islanded [22]- [24]. Because of that, some studies have expanded the usage of droop control to the grid-connected mode, in order to achieve seamless transfer [25]- [27].…”