HESS Based Hybrid Microgrid for Islanded and Grid Connected Operation

Abstract

Hybrid micro grid system consisting of diesel generator, PV array, wind energy units using HESS including SMES, Li/Ion battery, SC is presented in this paper. Also, grid connection of DC bus is achieved by using NPC. Grid connected, islanded, mode operation is investigated for microgrid system. Although such operation is not presented in literature for SMES, this paper examines not only SMES but also Li/Ion, SC. Furthermore, MPPT including P O algorithm through Cuk converter is used for transmission of PV power to dc bus. Moreover, Li/Ion battery, SC and SMES have bidirectional converters separately providing bidirectional power flow. In addition, produced energy by wind, diesel generator units using synchronous generator is transferred to DC bus via buck converter connected to output of the rectifier. Besides, supervisory controller carries out the charge/discharge of battery, SC, power transmission of SMES and enables diesel generator, according to SOC of Li/Ion and SC, PV energy existence, wind speed, grid power. Supervisory controller also realizes load shedding of non-critical loads on the condition of non-existing enough power. Presented system is analyzed for islanded mode and grid connected operation through Matlab/Simulink. Owing to the simulation, SMES, SC, Li/Ion battery, wind, PV, diesel generator and grid power transmissions are presented. Seamless operation of proposed system is achieved, fast transients under few cycles are acquired regarding to operation mode. THD of phase voltages, currents provide the limit in standards which is not given in other papers in the literature in detail.