Abstract
Low carbon emission transportation is attracting global attention where electric railway power systems (ERPS) and electric vehicles (EVs) act as a load. Besides the main utility grid, renewable energy sources (RES) including photovoltaic (PV) panels and wind turbines are implemented to supply the loads fully or partially. In this paper, a novel smart DC catenary system is proposed in which renewable sources, storage systems, and DC fast-charging stations are connected to the overhead DC catenary line of the high-speed railway power system. The generated power from renewable sources and consumed power by charging stations are processed by their dedicated DC-DC power electronics converters. Furthermore, a storage system is used as a backup system not only for the case of blackouts but also because of the intermittent nature of renewable energy sources to supply the loads continuously. The paper presents an optimal power control for various parts and a power management system (PMS) that manages the power flow from wind-PV-storage system to EV-ERPS system. The proposed system has been investigated using a real Italian Rome-Florence 3 kV high-speed line as a case study with real data of ERPS load. The EV fast-charging station power demand, wind speed, solar irradiance, and temperature were recorded for 24 h in order to provide us with realistic output data. The simulation results obtained by MATLAB/Simulink are presented to validate the effectiveness of the proposed system.
Highlights
Nowadays, countries are in great need of green and low carbon emission transportation; transportation electrification has been given worldwide consideration [1].The evolution to electrified transportation has been reflected by the emergence of electric vehicles (EV), hybrid electric vehicles (HEV), electric railway systems, etc. [2], and new technologies such as Digital Twin (DT) are currently being introduced into this market for better implementation [3]
Electric railway power systems (ERPS) have been introduced to the market from the beginning of the 20th century and they have been developed over time; they are operating in the form of high-speed trains, regional trains, subways, tramways, electric buses, etc
EV fast-charging infrastructure is connected to the DC catenary system through a dual active bridge (DAB) converter which provides the system with bi-directional power flow that is grid to vehicle (G2V) and vehicle to grid (V2G) where the latter one is considered for future developments
Summary
Countries are in great need of green and low carbon emission transportation; transportation electrification has been given worldwide consideration [1]. An integration scheme to reduce the subscribed power and to remove the related overrun by the RES has been evaluated in [12] for the metro system These researches are discussed in AC or low-voltage DC ERPSs considering one type of renewable resource. The authors of [13] have presented a medium-voltage dc (MVDC) multiterminal ERPS with the capability of transferring energy in 24 KV DC hub This system has been discussed as a paradigm or suggested model and the power flow control has not been mentioned. The main contributions of this paper can be defined as follows: the possibility of the integration of large-scale renewable energy sources (wind turbines and PV panels), charging infrastructures, and storage units with novel configuration into the DC catenary system of the ERPS is evaluated.
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