IMPACT OF INTERMITENCY COSTS DUE TO INJECTION OF SOLAR PHOTOVOLTAICS TO GRID ON ECONOMIC FEASIBILITY OF EXISTING POWER PLANT CASE STUDY OF BELITUNG SYSTEM

• Main Author: RAMADHANI (NIM: 23216090), PUTRI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/30039
• Institution: Institut Teknologi Bandung

<p align="justify"> <br /> <br /> The integration of Solar Photovoltaic (PV) which is one of the intermittent and nondispatchable power plants to the electrical system will result in a number of costs defined as intermittent cost. One of the intermittent cost is the cost to be borne by the existing plants. The occurrence of the costs is due to changes in the generation dispatch in the system. The change in the dispatch affects the change of Capacity Factor (CF) of the power plants from the originally planned. CF is a variable that determines the operational feasibility of a plant. The CF changes will have an impact on changes in the parameters of the plant's sensitivity, ie Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PP) and Benefit-Cost Ratio <br /> <br /> (BCR). The change in the feasibility of the existing power plant is the decrease in the feasibility of the plant and and can even become no longer fisibel to operate. <br /> <br /> Such changes can be a barrier to the integration of Solar PV to the electrical system, although the plant uses environmentally friendly renewable energy as primary <br /> <br /> energy. The problem can be solved if the feasibility changes of existing plants can be compensated by the decrease in system operation costs due to the integration of the Solar PV. <br /> <br /> In Belitung Island system which is a case study in this study, the decrease of feasibility level of existing power plants is indicated by the decrease of NPV, IRR, BCR, and the addition of PP of existing plants. The existing power plants affected by the decrease of the feasibility level are DPP Padang, PLTBg Austindo, and Suge power plant. Due to the integration of intermittent power plant which is Solar PV to Belitung system, the power plant that receives the greatest impact of feasibility decrease is DPP Padang. With 4 MW Solar PV penetration, NPV of DPP Padang <br /> <br /> has dropped dramatically to -2,05% of the original NPV when the Solar PV has not entered the system, yet. DPP Padang is the largest affected power plant because DPP Padang is the power plant that serves the peak loads of the day with the highest operation cost compared BgPP Austindo and Suge steam power plant which operates at the same time as Solar PV operation. This is indicated by the decrease in the NPV of BgPP Austindo and CPP Suge which is not significant, that is 98,17% of the original NPV for BgPP Austindo, and 92,11% of the original NPV for CPP Suge. IRR of DPP Padang has a very drastic decrease, which is only 36,90% left of the original IRR. The IRR of the BgPP Austindo and the IRR of the CPP Suge, is 99,25% and 98,04% of the original IRR. PP of DPP Padang has the addition of 2,77 years from 6,17 years to 8,94 years. While BgPP Austindo and CPP Suge has the addition of PP about 0,03 and 0,04 years, which is not significant. In general, the decrease of BCR of DPP Padang, BgPP Austindo and CPP Suge is not significant, where BCR of DPP Padang is 96,01%, BCR of BgPP Austindo is 99,75% and BCR of CPP Suge is 99.67% from the original BCR. <br /> <br /> Although the integration of Solar PV to Belitung system makes the feasibility of existing power plants that operate at the same time as the Solar PV operation goes <br /> <br /> down, a decrease in system operation costs due to the integration of Solar PV with a capacity of 4 MW can still compensate for the decrese in NPV of existing power plants in the system. However, the ratio of the system operation cost reduction due to the intermittent power plant integration to the Belitung system further decreases with the NPV decrease of existing power plants as the intermittent power plant capacity goes into the system. This is indicated by the rising NPV decrease of existing power plants ratio to the decrease of system operation cost on the Solar PV capacity of 6 MW or 1,5 times that goes into the system. The ratio of NPV decrease of existing power plants to the decrease of operation cost of the system is 31% in Solar PV penetration capacity of 4 MW and 44% in Solar PV penetration capacity of 6 MW. <p align="justify">