MODELING AND OPTIMIZATION OF HYBRID DIESEL, SOLAR AND BIOMASS WITH STORAGE POWER SYSTEM IN REMOTE ISLAND

• Main Author: Rizal Falfi, Muhammad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/87609
• Institution: Institut Teknologi Bandung

A hybrid system is a system that combines various power generation sources (thermal and renewable energy). The research is conducted on Gili Ketapang Island, located in Sumberasih Sub-district, Probolinggo Regency, East Java Province. The current condition in Gili Ketapang is that electricity demand is supplied by a Diesel Power Plant (PLTD) system. The PLTD in Gili Ketapang consists of two machines: CUMMINS II and CUMMINS III, each with a capacity of 525 kW, operated alternately. The maximum peak load recorded by the Gili Ketapang system was 474 kW in 2021. On average, in 2024, the load during the off-peak period (LWBP) is 302 kW, and during the peak period (WBP), it is 373 kW. The PLTD system has high operational costs, complex logistical dependencies, and significant environmental impacts. This research aims to provide a solution for Gili Ketapang to ensure reliable and high-quality electricity supply, reduce generation costs, and promote environmentally friendly energy through the implementation of a new system. Through a microgrid structure, the integration of renewable energy-based power generation systems, various types of storage, and diverse loads is explored. Solar PV, as a renewable energy source, is expected to reduce PLTD operational costs because solar PV obtains its primary energy source for free. However, like other renewable energy sources, solar PV has the drawback of being "intermittent," as it cannot continuously supply the system due to dependence on sunlight. Even though solar PV is complemented by a Battery Energy Storage System (BESS), its capacity cannot meet long-term continuous electricity demand. An additional environmentally friendly power generation source is needed, utilizing abundant local energy resources in isolated areas, such as biomass powered by maize stover (corn harvest residues). This biomass power plant is expected to improve the local economy. This thesis presents an optimization study on the design and development of a hybrid renewable energy system for microgrid applications in Gili Ketapang. The system integrates solar PV, biomass, and battery technologies. A Least Cost the optimal sizing of the components in the hybrid system, considering the resource potential and load requirements in Gili Ketapang. The evaluation shows that the most optimal configuration includes 798 kW of PV capacity, 343 kW of biomass, and 3.400 kWh of lithium-ion battery storage. For the hybrid system connected to the grid, the optimal Net Present Cost (NPC) is IDR 167,26 billion, and the cost of electricity generation (COE) is IDR 4.615/kWh. From an environmental perspective, the new system emits 9.543 kg of CO2 per year. In addition to designing a financially optimal system, this study also includes technical analysis using DIGSILENT Power Factory to simulate power losses and stability under specific conditions. The goal is to ensure the system is technically feasible as well as economically viable. The simulation results indicate that power losses decrease to 2,11% after implementing the new system, a 78,92% reduction from the losses in December 2024. This program is crucial as it anticipates rolling blackouts due to supply shortages and reduces generation costs. It aligns with PLN's program to support environmentally friendly energy. Local governments and PT PLN can collaborate to manage renewable energy resources in an integrated manner.