Power Management and Power Quality Control in Hybrid Unified-MIMO System Based Microgrid

Low voltage next-generation unified multi-input multi-output (U-MIMO) system-based AC-DC microgrids (MGs), equipped with distributed renewable resources (DERs), significantly contribute to sustainable development by offering reliable, decentralized and scalable electricity. It alleviates the burden on the main grid and promotes socio-economic development. However, challenges persist in power management, power quality and the high installation costs of battery management systems (BMS). To address these issues, this study introduces a modified hybrid U-MIMO system to optimize MGs. This system provides an all-weather synchronized solution, integrating multi-located PV nanoarrays and single-phase grid supply as multi-input sources for AC-DC multi-output loads with a bi-directional BMS. Grid interaction reduces the required battery capacity and thus lowers installation costs. The modified U-MIMO system enhances power management by accounting for BMS state of charge (SOC) and power generation from DERs. This study uses a single-phase induction motor and a rectifier with inductive load as non-linear AC loads, while an EV battery serves as the DC load. Multi-control structures within the hybrid U-MIMO system ensure a constant DC bus voltage, adhering to IEEE 519 standards. A comprehensive analysis with two modes and one scenario demonstrates effective power management, synchronization and power quality control, validating the system's capability to support diverse loads and applications efficiently.