Regulation of DC Bus Voltage for DC MicroGrid Using PSIM

Today the DC Microgrid has achieved popularity due to its easy interconnection with renewable energy resources and high reliability. This paper presents the voltage regulation of DC microgrid using a solar photovoltaic module, Li-ion Battery and AC grid as an input source. The outputs of these three inputs are interconnected with help of buffer circuit and are fed to dc bus. The voltage across DC bus is maintained to a certain desired value, which is being further regulated to four different lower voltages with help of buck converters. Buffer circuits are used to monitor the instantaneous power imbalance between source and load of the entire circuit. The boost converter is connected along the PV module and Li-ion battery respectively to regulate the output voltage of these sources to the desired value which is being fed to dc bus. The Maximum Power Point Tracking is also connected to the PV module which is essential to drive the system to the maximum power point to obtain the much efficiency. The system is modelled and simulated in the PSIM working environment. The dc bus voltage is also regulated to four different voltages levels so that the different dc household loads can be connected through it.