INTERNATIONAL JOURNAL of RENEWABLE ENERGY RESEARCH A.K. Yadav et al., Vol.7, No.3, 2017 Low-Voltage DC Microgrid Network: A Case Study for Standalone System Abhimanyu Kumar Yadav*‡, Abhijit Ray **, Makarand M. Lokhande *** * Department of Electronics and Telecommunication, SITRC, Nashik, India **Department of Solar Energy, PDPU, Gandhinagar, India ***Department of Electrical Engineering, VNIT, Nagpur, India (abhimanyu.yadav@sitrc.org, abhijit.ray@sse.pdpu.ac.in, mml@eed.vnit.ac.in) ‡ Corresponding Author; Abhimanyu kumar yadav, abhimanyu.yadav@sitrc.org Received: 18.01.2017 Accepted:20.03.2017 Abstract- In this paper a novel technique is used to aggregate power of the distributed renewable energy sources, especially the photovoltaic energy. The DC/DC converter is the main instrument for extracting the energy from these direct current (DC) renewable energy sources like solar photovoltaic module (PV), wind turbine, and fuel cell, etc. The reason for using DC/DC boost converter in this case of PV energy is for two reasons. Firstly, the maximum output voltages of PV modules at standard test condition (STC) are low in range of 30 to 45 volts. Secondly, DC voltages are being considered as standard by corporates like Emerge-alliance for lighting systems in green energy building. The paralleling of DC/DC converter boost converters helps in aggregation of varying power from these converters connected to different power rating PV modules under varying irradiation and in regulation of 48 volts DC at load terminal. To obtain the aggregate power from the parallel DC converters, this paper proposes a systematic approach for power sharing between converters under varying irradiance. The integrated circuit (IC) UC3843 is based on current mode control and it is the heart of the DC converters used in this proposed work. The cable resistance is another disturbing factor in regulation of the set standard DC voltage. With above mentioned factors, PV module of low power with current mode boost controlled DC converters is implemented and the simulation and experimental results are discussed. Keywords- Current Mode Control, Pulse Width Modulation, Power Sharing, Voltage Regulation, Direct Current, Linear Voltage Regulator.. 1. Introduction The DC distributed generation power can be directly used in DC appliances via the DC microgrid. The reason behind the gaining popularity of DC microgrid is the distributed renewable energy sources [1]. The different existing distributed energy sources that are contributing to the conventional grid are photovoltaic, micro turbine, fuel cell and wind power turbine etc. The demand of DC power for DC appliances in the years to come will be huge, merely based on the fact that the inherently DC nature of the renewable source and less conversion losses. Currently, world’s energy demand of 17-20% is being fulfilled by renewable energy [2]. In Nigeria, a detailed study suggested on design of energy efficient buildings for energy sustainability [3]. The domestic DC industry is currently in a nascent stage of its development when compared with its counterparts. In a case study at Virginia Tech’s Center for Power Electronics systems, it is found that 80% of all electricity goes through AC-DC conversions and losses occurred at each conversion stage are not additive, but multiplicative [4]. The priority of using DC power in residential appliances use and elimination of AC-DC conversions in the restructured DC distribution network is favored in [5-7,18]. The selection of 380 VDC for power distribution is approved by several organizations such as Emerge Alliance, European Telecommunications Standards Institute (ETSI), International Electrotechnical Commission (IEC) and EPRI [8]. A feasibility study of the DC electrical distribution system in Korean houses for various DC voltage supply is reported in [19]. Several research groups have studied the low voltage DC microgrid and concluded that 48 V DC distribution systems for residential area located near the DC power resources with optimized cable area could be a more economical system [20-22]. A low-voltage DC microgrid with various safety measures such as grounding methods and fault-detection are discussed [23]. The modular