Review on Bi-directional Converters for Battery Management System

Now days there is increasing interest in generating electricity from renewable energy sources .More renewable energy sources must be connected in the majority of applications. The sources come in a variety of forms (wind, solar, etc.) and have varying capacities for connecting to the power grid or load. Multiport bidirectional AC-DC converters have been proposed to improve grid integration and power management for numerous energy sources at the same time. More input ports allow a non-isolated AC-DC converter to connect several sources, such as fuel cells, wind turbine generators, and photovoltaic panels. The low level DC voltages from renewable sources are raised by the multiport AC-DC converter to the set high level voltage needed by the inverter or load. For renewable energy sources, the converter can provide essential control tasks like MPPT. In past, to connect a greater number of renewable energy sources of various types to grid or load a greater number of separate AC-DC converters are used to boost low level voltage to high level source voltage required by grid inverter or load. Instead of using separate converter for each sources AC-DC converter which has multiple ports are used, it has advantage of low cost, high efficiency and high power density. For the battery energy storage system, the summary suggests a bidirectional single-stage grid-connected inverter (BSG inverter). A dc-ac inverter and several bidirectional buck-boost type dc-dc converters (BBCs) make up the suggested BSG-inverter.