Load management system for tactical microgrids using solid state relays

Abstract

This paper describes a load management system for tactical microgrids that improves load balancing across three phases and provides load shedding capability. A single hardware design comprised of solid state relays enables switching of loads to specific phases during operation or, alternatively, shedding the loads to reduce demand. Load shedding can help alleviate overloading of generators and load balancing can optimize system operation, improve generator efficiency, and facilitate plug and play construction of tactical microgrids without the need to factor in load balancing during design or construction. Laboratory tests of the 208/120V 14.4 kVA prototype system have shown the ability to switch inductive and capacitive loads between phases, or shed load, within a single electrical cycle. The system is designed to operate autonomously for load balancing and have the capability to interface with a hierarchical microgrid controller for load shedding and to provide alternative settings for load balancing.