Non-critical Demands Managed Load Frequency Stabilization of Dish-Stirling-Biodiesel Based Islanded Microgrid System Using FF Optimized Controller

Abstract

The frequency stability of microgrid towards its reference value is very much important to provide uninterrupted quality power supply. This paper describes the use of demand side management particularly, direct control of controllable loads along with generation control to stabilize system frequency of an islanded microgrid consisting of dish-sterling solar Thermal system (DSTS), and biodiesel engine generator (BDEG) as the electricity generating sources where plug-in hybrid electric vehicle (PHEV), heat pump (HP), refrigerator (REFG) as controllable loads and a non-controllable load. Direct load control scheme for demand side management is analyzed. PI/PID controllers are used for demand response control and generation control. Particle swarm optimization (PSO) and firefly algorithm (FF) are used to optimize the controller’s parameters. The islanded microgrid is simulated for three different case studies and compares their system dynamics under PSO and FF based controller.