Interconnected islanded microgrid system using smart frequency bus signaling method with PV integration

Abstract

A microgrid is a practical solution for remote areas where the access to public electric grid is technically or economically unattractive. Islanded dc microgrid contains a number of renewable energy sources, local loads, and energy storage systems (ESS). To avoid the over-charging and over-discharging situations of ESS by keeping SoC of ESS in safe range, a coordinated control strategy should be used in islanded dc microgrids. The main objective of this proposed control strategy is to control the SoC of ESS by controlling the power generated by the RESs as well as controlling loads accordingly their priorities. This smart frequency bus signaling uses line frequency of the microgrid as communication link between power sources and their respective converters the amount of power they need to generate and prioritized loads in order to maintain the ESS state of charge below or equal its maximum allowable limit. Proposed system is simple, efficient and more reliable power control technique as it doesn't rely on external communication links and network distribution. Real-time hardware-in-the-loop results of an islanded microgrid are provided under various simulation conditions to validate the proposed expected control strategy in efficient system implementation.