Transmission Network Expansion and Reduction Planning considering Integration of Renewable Energy and Decline in Future Power Demand based on Cost-benefit Analysis and Robustness Evaluation

Abstract

It is expected that future power demand in Japan may decrease because of depopulation. In such case, it may be better to remove some transmission facilities to improve the utilization of remaining transmission network. At the same time, further penetration of renewable generation in the future makes it necessary to reinforce transmission network. Therefore, for the planning of future transmission network, planning method is necessary, which can satisfy simultaneously these requirements of network reduction and network expansion. This paper proposes a novel transmission network planning method considering both the expansion and the reduction of transmission lines. The proposed method utilizes a stochastic planning method to determine the investment and removal of transmission lines. Cost-benefit analysis and robustness evaluation are utilized to evaluate the obtained plans. The effectiveness of the proposed method is shown by a numerical example.