Abstract
The ambient factors significantly influence the maximum ampacity of the overhead transmission lines (OTL), therefore the load shedding model allowing for the constraint of line maximum ampacity calculated in the typical ambient condition may be inaccurate. Here we propose an improved load shedding model that considers the impact of ambient factors on electro-thermal behaviours of OTL. Based on the thermal balance equation of OTL, the influence of the electro-thermal resilient effect of the lines on the transmission capacity of OTL is analyzed. A steady-state electro-thermal coupling power flow (ETC-PF) model considering the influence of ambient parameters is established where the line temperature and serial resistance are treated as the system state variables. Then, the load shedding model taking the minimum power outage loss as the objective is proposed based on the ETC-PF model, which takes the line’s maximum allowable operating temperature as its safety constraint and considers various control measures. To simplify the solution process, an improved iterative linear programming (LP) algorithm is adopted to solve the proposed model. Case study demonstrate that the proposed method can fully exploit the electro-thermal resilient effect of the OTL while ensuring line safety according to the different ambient parameters of OTL, and obtain a more reasonable load shedding scheme with the minimum power outage loss.
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