Browsing by Subject "Photovoltaic"
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Item Impact of Photovoltaic Generation in the System Stability: A Case Study with Nuwakot PV(I.O.E. Pulchowk Campus, 2022-09) Chaudhary, PravinAs innovation drives costs lower and begins to fulfill the promise of a clean energy future, renewable energy is rising. Renewable energy sources like PV and wind are taking on greater significance as a source of power as we discover more inventive and affordable ways to capture and store wind and alternative energies. Due to sunlight's accessibility, solar PV systems may be used practically anywhere in the world. Traditionally it was assumed that, the grid inertia is sufficiently high with some small variations with respect to time. But this is not valid for the power system with high Renewable Energy Sources (RES) shares composed of PV and wind generations. The increase in the generation of the inertia-less system can cause different synchronization and stability issues along with the implication over frequency dynamics. So, the size of PV system to be injected to the system should be studied. In this study, the simulation has been performed for the interconnected system encapsulating the Kathmandu valley, considering the scenario of injection of PV generation at Nuwakot. The load flow analysis before and after the placement of PV infers that the generation being placed away from the load center increases the overall network loss with minor change in the voltage at the nearby substations. The loss of the existing loss with 3.47%, with the placement of the PV at Nuwakot has increased to 3.97%. The transient analysis indicates that when the PV suddenly isolates from the INPS, the voltage of the terminal bus of Devighat substation drops down to 0.954pu from existing 1.008pu. For the higher value of generation considered, the impact on the frequency and voltage is severe however is within the limits for the case of Nuwakot PV. In case of the synchronous system, with the increase in the generation voltage, for certain generation limits, the stabilization time reduces and the transient response would be gradual. Finally, the small signal stability analysis with 0.1pu torque added in the generator at the Devighat confirms that the existing system is stable even due to the small disturbances. When the PV system was increased to 46MW capacity, the eigen value for the Mode 00046 and Mode 00047 was on the positive real axis with negative damping ratio indicating the system is unstable with some disturbances. However, the system with synchronous generator is stable at 46MW generation. This indicates that the size of inertia-less PV generation needs to be studied for the integration with the INPS and the stability with the synchronous machine is higher as compared to the PV generations.Item Potential determination, performance and voltage profile analysis of grid connected roof-top solar PV at Bishnumati Distribution Feeder(Pulchowk Campus, 2022-03) Poudel, Padam RajThis thesis presents the solar roof-top photo-voltaic generation capacity at Bishnumati feeder of Balaju Distribution Control System (DCS) with its performance and voltage profile analysis during grid connection by considering eleven potential commercial and non-commercial buildings. The Building Foot-Print Area (BFA) obtained is 8915.13 m2 and the actual photo-voltaic area (PVA) is 4190.11 m2, which is used to install the solar module in the roof of the selected buildings. PVsyst is used for performance analysis, the energy generated by solar array (E_array) and energy supplied to the grid (E_grid) is 1018.319 MWh and 982.039 MWh per year respectively. The performance ratio over the year is 0.74. The average capacity factor of overall installation is obtained as 17 %. ETAP is used for feeder modeling and load flow analysis. Form load flow analysis the minimum grid voltage before solar PV injection is 10.32 kV at a nominal bus voltage of 11 kV. After injection of solar PV into the grid, the minimum bus voltage is improved to 10.53 kV.Item Techno-financial Analysis of Floating Solar Photovoltaic System in Nepal(I.O.E. Pulchowk Campus, 2022-09) Sah, ShwetaFloating Solar photovoltaic system is one of the fast growing PV technology in Asia. It is fairly new technology with development of less than 10 years. This system helps in cooling down of solar PV modules which ultimately increases the efficiency and energy production of the solar PV system. This research includes experimental technical and financial analysis of a floating solar PV system and its comparison with the land based Solar PV system. A solar panel was installed on the pond behind center of energy studies (CES) which is inside Pulchowk Campus. Another Solar panel of same capacity was installed on land on the same site. For their comparison, measurements of temperature, open circuit voltage and short circuit current were taken for 10 days. The temperature around the floating solar photovoltaic system was always less in compared to the landbased photo voltaic system. The result shows increase in the power of floating solar PV system by approximately 12% in comparison to the land based solar PV system. The irradiance absorbed by floating solar PV system was nearly 1.5% more than the land based solar system. The structural stability of the floating structure of the floating solar photovoltaic system was analyzed to determine its feasibility.