ISSN: 2278 – 909X International Journal of Advanced Research in Electronics and Communication Engineering (IJARECE) Volume 2, Issue 12, December 2013 927 All Rights Reserved © 2013 IJARECE A CO-ORDINATION CONTROL OF A NEW HYBRID MICRO GRID SYSTEM FOR AC/DC WITH REDUCED MULTIPLE CONVERSIONS T.Pardhu 1 , K.Chakravardhan Reddy 2 , B.Nagi Reddy 3 1. Asst.Prof, Dept of E.C.E, Brilliant Group of Technical Institutions, Hyderabad 2,3. Asst.Prof, Dept of EEE, Brilliant Group of Technical Institutions, Hyderabad Abstract — This thesis first proposes a hybrid ac/dc micro-grid and its coordination control for reducing the processes of multiple conversions in an individual ac or dc grid. Renewable energy based distributed generators (DGs) play a dominant role in electricity production, with the increase in the global warming. Distributed generation based on wind, solar energy, biomass, mini-hydro along with use of fuel cells and micro- turbines will give significant momentum in near future. Advantages like environmental friendliness, expandability and flexibility have made distributed generation, powered by various renewable and nonconventional micro-sources. The micro-grid concept introduces the reduction of multiple reverse conversions in an individual AC or DC grid and also facilitates connections to variable renewable AC and DC sources and loads to power systems. The interconnection of DGs to the utility/grid through power electronic converters has risen concerned about safe operation and protection of equipment’s. To the customer the micro-grid can be designed to meet their special requirements. In the present work the performance of hybrid AC/DC micro-grid system is analyzed in the grid tied mode. Here photovoltaic system, wind turbine generator and battery are used for the development of Micro- grid. A small hybrid grid has been modeled and simulated using the Simulink in the MATLAB. The simulation results show that the system can maintain stable operation under the proposed coordination control schemes. Index Terms— Hybrid ac/dc micro-grid, RES, Distributed generators (DGs), Photovoltaic system, Wind turbine generator and Battery. I. INTRODUCTION As electric distribution technology steps into the next century, many trends are becoming noticeable that will change the requirements of energy delivery. These modifications are being driven from both the demand side where higher energy availability and efficiency are desired and from the supply side where the integration[2] of distributed generation and peak shaving technologies must be accommodated. Power systems currently undergo considerable change in operating requirements mainly as a result of deregulation and due to an increasing amount of distributed energy resources. Fig.1 Micro-grid power system The micro-grid often supplies both electricity and heat to the customers by means of combined heat and power plants (CHP), gas turbines, fuel cells, photovoltaic (PV) systems, wind turbines, etc. The energy storage systems usually include batteries and flywheels. The storing device in the micro-grid [1] is equivalent to the rotating reserve of large generators in the conventional grid which ensures the balance between energy generation and consumption especially during rapid changes in load or generation. Recently more renewable power conversion [3] systems are connected in low voltage ac distribution systems as distributed generators or ac micro grids due to environmental issues caused by conventional fossil fueled power plants [5]-[7]. On other hand, more and more dc loads such as light-emitting diode (LED) lights and electric vehicles (EVs) are connected to ac power systems to save energy and reduce CO emission. When power can be fully supplied by local renewable power sources, long distance high voltage transmission is no longer necessary. AC micro grids have been proposed to facilitate the connection of renewable power sources to conventional ac systems. However, dc power from