Abstract
Thanks to the latest developments in energy storage technologies such as secondary batteries and EDLCs, the application of energy storage systems (ESS's) in the DC railway power feeding network is attracting strong interest. The ESS's are expected to mitigate a number of problems of the DC power feeding, especially the occasional loss of line receptivity for the regenerating trains and the large voltage drops. For railways, it can be assumed that the track and speed profiles are already available for all runs of trains before the runs actually take place, and therefore the consumption of energy and power by trains during these runs can be estimated before the runs actually take place. The authors' research group have proposed a simple scheme of estimating line receptivity by using the estimation results of power consumption of trains, with the expectation that this scheme can be applied to devise a cleverer charge/discharge control of onboard ESS's. In this paper, the authors propose to extend this idea to stationary ESS's. After explaining how to estimate the line receptivity of stationary ESS's, the results of the evaluation of the estimated line receptivity by using numerical simulation is shown in this paper, followed by the discussion on how a cleverer charge/discharge control of stationary ESS's can be devised using the estimated line receptivity.
