INNOVATIVE ENERGY SOLUTIONS FOR PARK MICROGRIDS: AN IN-DEPTH ANALYSIS OF HYBRID STORAGE TECHNOLOGIES

Abstract

Amid the escalating global energy crisis and heightened environmental concerns, clean and sustainable energy sources such as solar, wind, and nuclear energy have garnered increased attention and significance. Microgrids, serving as pivotal technology for integrating renewable distributed generation systems, energy storage devices, and loads into controllable subnetworks, offer versatility in both on-grid and off-grid applications. Among microgrid configurations, the DC microgrid has emerged as a promising choice, offering a straightforward structure, high efficiency, superior power quality, and circumventing issues such as frequency deviations, phase synchronization, and reactive power compensation. However, the inherently intermittent nature of distributed generation and variable loads can introduce voltage fluctuations, power imbalances, and jeopardize system reliability in DC microgrids. The paper presents a comprehensive control method that coordinates the interaction between photovoltaics, hybrid energy storage, and the larger power grid to stabilize the DC bus voltage. The approach ensures power balance within the system. In grid-connected scenarios, a dedicated grid-connected conversion module facilitates energy exchange between the DC microgrid and the main power grid, preserving power equilibrium. For off-grid operations, the method incorporates the operational characteristics of various energy storage units, setting thresholds for supercapacitors and lithium batteries to manage photovoltaic and hybrid energy storage output effectively, enhancing system dynamics and prolonging the life of power electronic devices.