Design and Implementation of Energy Management System With Fuzzy Control for DC Microgrid Systems

Abstract—This paper presents the design and implementation of an energy management system (EMS) with fuzzy control for a dc microgrid system.Modeling, analysis, and control of distributed power sources and energy storage devices withMATLAB/Simulink are proposed, and the integrated monitoring EMS is implemented with LabVIEW. To improve the life cycle of the battery, fuzzy control manages the desired state of charge. The RS-485/ZigBee network has been designed to control the operating mode and to monitor the values of all subsystems in the dc microgrid system.

(Index Terms—Energy management system (EMS), fuzzy control, microgrid.)

Bridgeless SEPIC Converter With a Ripple-Free Input Current

Abstract—Conventional power factor correction (PFC) singleended primary inductor converter (SEPIC) suffers from high conduction loss at the input bridge diode. To solve this problem, a bridgeless SEPIC converter with ripple-free input current is proposed. In the proposed converter, the input bridge diode is removed and the conduction loss is reduced. In addition, the input current ripple is significantly reduced by utilizing an additional winding of the input inductor and an auxiliary capacitor. Similar to the conventional PFC SEPIC converter, the input current in a switching period is proportional to the input voltage and near unity power is achieved. The operational principles, steady-state analysis, and design equations of the proposed converter are described in detail. Experimental results from a 130Wprototype at a constant switching frequency of 100 kHz are presented to verify the performance of the proposed converter.

(Index Terms—Bridgeless converter, coupled inductor, power factor correction (PFC), single-ended primary inductor converter (SEPIC).)