International Conference on Electrical Engineering, Informatics, and Its Education 2015 B - 31 Management Strategy of Hybrid Microgrid to Reduce Multiple Conversion Hasti Afianti Industrial Technology Faculty Institut Teknologi Sepuluh Nopember Electrical Engineering Study Program, Engineering Faculty University of Bhayangkara Surabaya Ontoseno Panangsang, Adi Soeprijanto Industrial Technology Faculty Institut Teknologi Sepuluh Nopember Surabaya, Indonesia Zenno_379@yahoo.com, adisup@ee.its.ac.id Abstract—In the past few years, renewable energy sources (RES) demand has grown. Distributed generation based on wind, solar energy, biomass, microhydro become alternative power generation sources. Variation of the power generated by each source and the load that connected to microgrid system makes microgrid system become complicated. The application requires variation of power converter, like inverter, rectifier, boost, etc. Power converter is a power electronics equipment that is non linear, so the amount of power transformer equipment will increase the current and voltage harmonics on the microgrid system. This paper proposed management of hybrid microgrid. The concept introduces the reduction of multiple reverse conversions in an individual ac or dc microgrid and also facilitates connection to variable renewable ac and dc sources and loads to power systems. The model and simulation was built with Simulink/Matlab to verify the proposed system. Beside reduce the multiple conversion, DC and AC Microgrids can support each other, they operate togather and share surplus energy. Keywords— Hybrid Microgrid; Renewable Energy Source; Bidirectional Converter I. INTRODUCTION The conventional energy resources are depleting day by day. Soon it will be completely vanished from the earth so we have to find another way to generate electricity. The new source should be reliable, pollution free and economical. The alternative are using renewable energy sources (RES) like geothermal, tidal, wind, solar etc. Some RES has many drawbacks, like tidal energy that can only implemented on sea shores and geothermal energy that needs very larger step to extract heat from earth. Among the various types of RES, solar energy and wind energy have become the most promising and attractive, because it has simple way to generate. Indonesia is a country with abundant renewable energy resources. The existence of Indonesia on the equator provides the opportunity for sun shines all year round. Microhydro, wind and tidal are few types of renewable energy that has great potential to be developed. Even their potential, solar energy has drawback that it could not produce electrical energy in rainy and cloudy season so we need to overcome this drawback we can use two energy resources so that any one of source fails, other source will keep generating the electricity. And in good weather condition we can use both of them. The combination between two or more kind of energy ac or dc source named hybrid microgrid system. Based on the power generated by RES makes hybrid microgrid system becomes complicated, because it contains varying load type. The application requires many power converters[1]. Power converter is a power electronics equipment. That is non linear, so the application amount of power converter equipment not only will increase the harmonics in the microgrid system but olso expensive. This paper proposed management of hybrid microgrid. The aim of this management is to reduce multiple conversion. II. HYBRID MICROGRID SYSTEM A. Hybrid Microgrid Systen Hybrid microgrid system are system that generate energy from two or more raw energy source and units that contribute to each ather correspondingly. The aim of hybrid systems is to increase capacity and to cover an existing shortfall. There are many advantages of hybrid power generation systems. These advantages can be listed as below[2].  The possibility to combine two or more renewable energy source, based on the natural local potential of the users.  Environmental protection especially in terms of CO2 emission reduction.  Low cost – wind energy, and also solar energy can be competitive with nuclear, coal and gas especially considering possible future cost trends for fossil and nuclear energy.