Realization of Streamlined Multi-Mode Functionality of Standalone LVDC Microgrid With Modular PV Architecture

Implementation of low voltage DC (LVDC) microgrid in a standalone form comprising of modular photovoltaics (PVs) is evolving as a flexible power distribution architecture for energizing consumer appliances in various small-scale facilities. However, multi-converter architecture along with multi-mode functionality poses complexity in system modeling and regulation approaches. This work outlines a broad yet precise signal perturbation modeling for different viable operating modes for the overall system to facilitate systematized power management. To address economic and smooth functionality, the mode shifting logic is deployed by estimating the magnitude of bus voltage from the output voltage and current information of PV-followed power converters without an additional sensing arrangement. Flexibility in control loop implication is ensured by executing peak inductor current information-based mixed-signal current control algorithm for battery and PV-fed converters. Analytical investigations are evaluated with a developed hardware prototype, accounting for the precise functioning of the designed overall control logic using microcontroller units to demonstrate a practical and reliable solution for consumer needs.