MODELING AND SIMULATION OF GROUNDING PROTECTION FOR PROTECTING HIGH VOLTAGE DIRECT CURRENT (HVDC) TRANSMISSION LINES FROM LIGHTNING

Dayang Syahirah, Awang Shebli (2023) MODELING AND SIMULATION OF GROUNDING PROTECTION FOR PROTECTING HIGH VOLTAGE DIRECT CURRENT (HVDC) TRANSMISSION LINES FROM LIGHTNING. [Final Year Project Report] (Unpublished)

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Abstract

A very long-distance transmission lines has a high potential of the electrical losses. High Voltage Direct Current (HVDC) transmission systems are considered as an outstanding solution for this problem. However, HVDC transmission lines are vulnerable to lightning strikes. A lightning strike injects electricity into the transmission lines at the location of the contact. Without the used of simulation programmes, understanding lightning performance might be challenging. PSCAD, a capable programme, was used to generate the necessary data to explore this phenomenon. In this study, a 500kV HVDC transmission system is used as a case study to evaluate the impact of lightning strikes on the HVDC transmission tower. A 500kV HVDC transmission system was constructed using the PSCAD software by considering the real parameters of shielding wire and the tower conductors. A complete 500kV HVDC transmission system model consists of tower model, tower grounding resistance, insulator model, back flashover model and transmission lines. A thorough evaluation of the 500kV HVDC transmission line transient performance during lightning strikes is carried out, taking into consideration various technical parameters. In this study, two scenarios are selected for studying the influence of the lightning strikes on the transmission tower. Double exponential model of lightning strike was constructed using the PSCAD software to produce the lightning waveforms. As for the first scenario, the lightning strike was injected to the shielding wire and the impact of changing the tower grounding resistance was investigated on the insulator flashover occurrences. The second scenario where the lightning strike was injected to the phase conductor (A). The insulator flashover occurrences were investigated by changing the values of tower grounding resistance. From the simulation result, increasing the tower grounding resistance results in higher induced voltage across the insulator for both scenarios. This will result in a higher change of the occurrences of the insulator flashover

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