Power System Study on 25 kW Solar and Diesel Generator based Micro Grid

Abstract

In recent years, there has been a worldwide growth in the exploitation of renewable energy considering its capacity of generating safe and clean energy. India is also taking renewable energy resources as alternative for future energy needs either grid inter- acted or as stand-alone system. Among the available renewable resources the most promising and reliable distributed generation is photovoltaic due to excess amount of presence of solar radiation in various parts of India, absence of moving parts in the generation system, less maintenance requirement and possibility of installation using utilized space on rooftops and wastelands around buildings. The thesis consisting the power system studies of the 25kW Solar system with battery storage system and diesel generator which are connected to make DC grid maintained at 500 ± 1 %Vdc. The DC grid is connected to an inverter which was synchronised with the Utility grid maintained at 415 Vac. The simulations performed contains the control strategy and algorithm for load sharing between the photovoltaic, battery storage, diesel generator and Utility Grid for varying weather conditions , and load fluctuations for deciding the power intake from the distributed energy resources(DER). In case of the failure of the Solar system and the battery storage, if it is unable to satisfy the load the diesel generator can be used as a backup to feed the load in standalone grid. In grid connected system the utility grid was used to feed the load in the case failure of all distributed Energy resources. The thesis represents Standalone DC microgird as well as Grid interactive. The coordinated control of AC-DC Hybrid grid has been presented. Harmonics Analysis has been done at Point of common coupling accordingly filter has been designed for harmonics compensation.