Circuits and Systems, 2016, 7, 1106-1112 Published Online May 2016 in SciRes. http://www.scirp.org/journal/cs http://dx.doi.org/10.4236/cs.2016.77094 How to cite this paper: Sathishkumar, R., Malathi, V. and Premka, V. (2016) Optimization and Design of PV-Wind Hybrid System for DC Micro Grid Using NSGA II. Circuits and Systems, 7, 1106-1112. http://dx.doi.org/10.4236/cs.2016.77094 Optimization and Design of PV-Wind Hybrid System for DC Micro Grid Using NSGA II R. Sathishkumar, V. Malathi, V. Premka Department of Electrical and Electronics Engineering, Anna University Regional Campus Madurai, Madurai, India Received 21 March 2016; accepted 24 May 2016; published 27 May 2016 Copyright © 2016 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract The world is heading towards renewable energy, but the two key disputes that stop its well-known adoption are the power production level and the price of the production. Distributed generation (DG), and hybrid systems with battery backup are the solution for uninterrupted power supply. It is obtained using the Multi-Objective Genetic Algorithm (NSGA II). Techno-economic methodology is used in this proposed system for the size optimization. The result is based on the system cost, in order to meet the load requirements. The effect of temporal sampling is optimized using low-rate temporal data. It is compared with hybrid DC microgrid, which has been optimized using high temporal resolution data. Keywords Microgrid, Optimization, Photovoltaic, Wind Turbine, Storage System, Genetic Algorithm, NSGA II 1. Introduction DC distribution systems have been making popularity owing to the high efficiency of power supply and high re- liability in operation. The renewable energy sources interconnect with utility grid due to improved energy de- mand and decreasing fossil energies. Very random and intermittent power is generated using RES. Renewable energy sources along with storage system gives a continuous power supply. PV, wind generation and battery storage system in a DC microgrid system are illustrated in Figure 1. To avoid integration problems present in the hybrid energy systems, DC distribution system is the one way of solution [1] [2]. Usage of renewable energy improves because conventional sources are depleting rapidly. Anyway, two main limits exist: power production and cost of apparatus. DC schemes are becoming more and more important due to the high effectiveness, com- pared to AC systems [3] [4]. For the energy storage, a battery bank is used to mitigate fluctuations in the generation. This will absorb the