Economic Retrofitting of Old Transmission Line: An Anti-Galloping Case Study

The construction of the new type power system with high penetration of renewable energy puts forward higher requirements for the reliability of long-distance electricity transmission. However, galloping of the old transmission lines causes flashover, tripping, and even line breakage and tower collapse, which poses a great threat to the power system operation. Promoting the retrofitting of old transmission lines is an important initiative. Thus, the causes and countermeasures of old transmission line galloping are discussed in this paper. According to current regulation rules of electricity transmission price, the investment in anti-galloping projects will inevitably lead to a price increment. For maximum social welfare, a trade-off principle for anti-galloping project scheme formulation is then proposed, which balances technical effect and project economy. The feasibility of the principle is verified by an actual case in Northeast China's power grid.