Integration of PV and Battery Storage for Catenary Voltage Regulation and Stray Current Mitigation in MVDC Railways

Abstract

Innovative advancement in power electronics is reshaping the conventional high-voltage transmission systems and has also opened a new paradigm for researchers to consider its benefits in the railway electrification system (RES). In this regard, the medium-voltage direct current RES (MVDC-RES) is a key area of interest nowadays. In this paper, a secondary energy source (SES) consisting of renewable energies (REs) and energy storage systems (ESSs) is proposed to solve the issues of catenary voltage regulation, rail potential, and stray current in the MVDC-RES. Some of the major integration topologies of the SES are analyzed for MVDC-RES and the most effective one is proposed and implemented. The voltage at the point of connection (PoC) of the SES is used as a reference for controlling different operation modes of REs and ESSs. Moreover, feedforward control is used at the ESS converter to attain the quick response from the batteries for the desired operation. The proposed scheme improves the catenary voltage, and reduces the rail potential and stray current. Besides, the scheme provides higher energy density and reduces line losses. Simulation results are provided to validate the operation modes and advantages of the proposed scheme.

Medium‐voltage DC electric railway systems: A review on feeding arrangements and power converter topologies

“…While control schemes [69][70][71], stability analysis [72,73], and corrosion issues [74,75] in MVDC railways have been investigated in the literature, interaction between the power electronic converters and signalling system, developing suitable protection equipment (e.g. high-current MVDC circuit breakers), and economic analysis need more attention from the researchers.…”

Using PSO algorithm for power flow management enhancement in PV-battery grid systems

“…The existence of a bidirectional converter (BUCK-Boost DC/DC) is necessary to interconnect the battery with the other equipment of the system. Because of its dual functionality, it functions as a boost converter in charge mode and a buck converter in discharge mode [8] , [9].…”

“…Chettibi and Mellit [21] using PSO optimization, we were able to determine the best choice variables 𝑥 * = (𝑘 1 * , 𝑘 2 * , 𝛽 * ) 𝑇 to represent the scale factors of a certain FLC structure that is similar to a PID and minimises the desired cost function based on the maximum overshoot (MO) and integral of absolute error (IAE) performance criteria (IAE). Overshoot D, steady state error Ess, rise time tr and settling time ts of the system step response are among the time domain control requirements shown in (8), which also include other needs. PSO is a meta-heuristic algorithm that draws inspiration from migrating bird behaviour.…”

“…Farhat et al [7] suggested to use a fractional proportional-integral (FO-PI) controller to decouple control of a grid-connected PV system. According to the power produced by the solar systems and the power consumed by the electrical network, this decoupled control method enables separate control of the actual [8] presented a PI-GA controller was used to improve the performance of a 3-phase grid-connected PV system by adjusting the KP and Ki values of the PI controller of the current regulator that was used to control the P and Q powers of the system . In this paper, the FLC tuned by PSO is introduced into two regulation loops.…”

Catenary overvoltage stabilization of DC railway electrical system by integrating EV charging stations

“…Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works." stabilization and energy savings [8], [9]. However, large costs are needed to purchase these storage devices.…”