DC-DC converters application in fuel-cell stack grid integration

In this paper different Fuel-Cell Implementation possibilities to power network are provided and accordingly will discuss considerations for grid connection of renewable energy resources using power electronic resources particularly Fuel-Cell Stacks and will study methods to connect output power of these sources to the system. The basis of network connection of stacks is mostly complex due to the fact that output voltage of these types of sources is usually in minimum of 40 to a maximum of 80 Volts and hence connection of these sources to power networks and heavy high current loads without interference of different types of DC-DC Converters in DC part and PWM Inverters in the AC part of connection is impossible. The sequence of DC-DC-AC should be considered in advance for these systems to prevent faults and separation of these low-voltage sources from the higher voltage networks. So a study on various types of DC-DC converters and different techniques used to connect fuel-cell stacks to grid is done and considerations of separation for network connection of these low voltage DC sources of fuel-cell stack energy to provide adequate energy for both single and three phase loads is studied. Analyses are done to verify the results of connection methods in power electronic equipments.