Case study of stationary energy storage device in a 3 kV DC traction system

Abstract

The paper presents the results of economic study of energy storage system (ESS) implemented in 3 kV DC power supply system. Two conceptions of ESS have been investigated: ESS with supercapacitor (SC) and hybrid ESS (HESS) with SC and LFP battery. The investigated locations of energy storage systems are considered among existing traction substations in two railway lines with different density of train operation. The considered aims of energy storage system implementation are decreasing of energy consumption by maximum regenerative energy utilization and reduction of peak 15min power demand of traction substation. The paper presents a method of regenerative power estimation depending on the location of the considered ESS implementation point. Also the method of optimal location selection of ESS in terms of minimization of Simple Payback Time (SPBT) of investment is presented. Besides the influence of initial cost value as well as energy price on the SPBT value are investigated. The results are compared between two railway lines with different number of trains operating.

Fault-Tolerant Control in a Peak-Power Reduction System of a Traction Substation with Multi-String Battery Energy Storage System

“…For example the author of the article [19] proposes the control and operation of a single-phase 13-stage power conversion system (PCS) which, together with the energy storage (ES), is used to reduce the peak power of a high-speed railway substation (HSRS). In [20] two concepts of ESS implementation and their impact on the 15 min power demand limitation and reduction in energy consumption limitation have been considered. The authors have researched the SC energy storage and the more effective hybrid energy storage system (HESS) consisting of SC and the LFP (lithium iron phosphate battery-LiFePO 4 ), in which the SC is used for the utilization of regenerative energy, while the LFP battery is used to compensate the 15 min power demand of the TS in order to reduce power demand charge Both variants were also researched taking into account the payback time of the ESS investment.…”

Small-Scale Battery Energy Storage System for Testing Algorithms Aimed at Peak Power Reduction

“…Battery energy storage systems implemented in the traction substation and wayside energy storage systems (WESSs) [5][6][7][8][9] contribute to the reduction of peak power and energy consumption [10]. Peak power reduction impacts the 15 min average power reduction [11] and, consequently, reduces the contracted power at the traction substation [12]. The article [12] presents the concept of implementing a hybrid energy storage system (HESS) to reduce the demand for 15 min peak power, while [13] presents the control strategy for this system.…”

“…Peak power reduction impacts the 15 min average power reduction [11] and, consequently, reduces the contracted power at the traction substation [12]. The article [12] presents the concept of implementing a hybrid energy storage system (HESS) to reduce the demand for 15 min peak power, while [13] presents the control strategy for this system. A further effect of such a development is the reduction of fixed operating costs [14][15][16].…”

Experimental investigation of actual situation of using and accounting of recovered energy of regenerative braking mode at the DC traction system

“…The first strategy (stationary ESS) is to arrange the ESS equipment at the traction substations (substation-inside ESS) or other elements of the traction power supply system (wayside ESS). Several literatures deal with the problems of implementations of the stationary ESS systems into DC traction power supply system of metro lines [2][3] and railway lines [6][7][8][9].…”