Abstract
It is important to determine the possibility of high risk value of geomagnetic induced current (GIC), accurately define the level of power grid GIC, understand the distribution characteristics of disaster GIC, to prevent, control and evaluate the impact of magnetic storm disturbance on the power grid. Based on the full node model, the long term performance of 2003-2017 geomagnetic disturbances in Ethiopia 400kV-230kV power grid is analyzed. The results show that the probability of GIC high risk value of low voltage power grid in Ethiopia low latitude region is not zero. The GIC values in the northwest, Southeast and central regions are larger, and the GIC values in the northeast and southwest regions are smaller. When evaluating GIC, 400KV substations named S1, S2, and S8, S10, S48 and 230 kV substations such as S42, S43, S17, S16 and S53 should be monitored intensively. To ensure the calculation accuracy of high voltage power grid GIC is a prerequisite for the evaluation and governance of GIC. For GIC node accuracy, it is only need to consider the effect of 230kV grid on 400kV power system; For line GIC precision, it need to consider the influence of 230kV grid on 400kV power system and 400kV grid on 230kV power system.
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