OPTIMIZATION OF RENEWABLE ENERGY BASED SMART MICROGRID SYSTEM FOR ICE BLOCK MACHINE POWER SUPPLY

• Main Author: Musfirin
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/46623
• Institution: Institut Teknologi Bandung

This research was conducted with the purpose of optimizing the smart microgrid system based on renewable energy in the Kemujan Village, Karimunjawa District. From this optimization the system become more reliable and efficient to supply the electrical energy consumption for the ice block making machine. The results of the optimization of smart microgrid system will be analyzed to determine the performance, power distribution and production cost of making ice block and also analyzing performance rasio of photovoltaic. This smart microgrid is designed by utilizing components that have been installed on site, such as 5 kWp Photovoltaic, 4 kW generator and 12 V batteries, 80 Ah, 20 pieces. Optimization is conducted by using software simulation, Pvsyst, Homer and Etap. From the simulation results of PVsyst, the annual production of solar energy can supply 30% of the power consumption of ice block making machine. From the Homer simulation results, the optimal value for batteries with a capacity of 12 V, 80 Ah is 12ea, the optimal value for the generator is 4 kW and the optimal value for PV is 13 kWp, while from the simulation result of ETAP the initial motor current is around 43 Amperes. For testing on a sunny day, the smart microgrid system is able to supply the power load by solar energy and batteries, with an inverter efficiency of 81.18% and system performance 100%. For testing on cloudy day, the smart microgrid system supplies the power load by solar energy, batteries and grids (PLN /generator), with an inverter efficiency of 81.38% and system performance of 98.70%. For testing at night, the smart microgrid system supplies the power load by batteries and the grid (PLN/generator), with an inverter efficiency of 89.39% and a system performance of 98.33%. The smart mirogrid system testing for one production cycle of ice block at sorrounding temperature required is around 62.5 hours with a total energy requirement of 121.591 kWh. The electricity supply from PV is 18.462 kWh and supply from PLN is 99.709 kWh with electricity PLN cost about Rp146.301,00. For testing at low temperature (-7 o C), it takes about 30 hours to produce ice blocks, with a total energy requirement of 54.568 kWh. The electricity supply from PV is 4,965 kWh and supply from PLN is 48.510 kWh with electricity PLN cost about Rp71,177,00. Total production ice blocks for one cycle is 6 pieces with a selling price of Rp 20.000,00/piece, so total income for one production cycle is Rp120,000,00. From two tests, it can be concluded that the operation of the ice block machine must be continuously to keep the brine at low temperature and produce a profit margin. In photovoltaic testing, efficiency monocrystalline PV was 8.20% and polycrystaline PV was 7.23% with performance ratio 50.12% and 52.74%.