Modeling of renewable rich AC-DC hybrid microgrid system

Abstract

With the huge penetration of renewable-based sources into the distribution grid, analysis of distributed generation-based grid is becoming more difficult. In Microgrid systems, technologies such as converters with bidirectional flow capability, generations with interfaces having synchronization capability, loads with monitoring features, and advanced metering infrastructures have gained prominence. For the detailed analysis of Hybrid Microgrid (HMG), proper mathematical modeling is required. In this paper, mathematical modeling of the hybrid microgrid has been presented. An HMG contains both AC and DC buses. DC bus is connected with a solar photovoltaics system and battery storage system and maintains a constant voltage. AC subgrid is connected with a diesel generator which also maintains the constant voltages at its terminals. The advantage of AC Microgrid is its ability to utilize existing infrastructure for operation and DC Microgrid is its lack of reactive power and synchronization requirements. The developed model of HMG can be utilized to analyze such a system with varying degrees of generation and load dynamics and stability analysis.