Journal of Modern Power Systems and Clean Energy

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Home > Archive>Volume 9, Issue 3, 2021 >585-594. DOI:10.35833/MPCE.2019.000155
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Integration of PV and Battery Storage for Catenary Voltage Regulation and Stray Current Mitigation in MVDC Railways
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1.School of Electrical Engineering, Southwest Jiaotong University, Chengdu, China;2.Department of Electrical Engineering (Bannu Campus), University of Engineering & Technology (UET), Peshawar, Pakistan

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    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.

    表 3 Table 3
    表 1 Table 1
    图1 活化后的AWC中的多孔结构以及AWC内部的垂直孔道[40]Fig.1 The porous structure in the activated AWC (a, b), the vertical pores (c, d) inside the AWC [40]
    图3 不同放大倍数下LFW@PANI纵截面的SEM图[43]Fig.3 SEM images of LFW@PANI longitudinal section under different magnifications[43]
    图4 木炭N、S掺杂制备工艺流程图[39]Fig.4 Process flow chart of N and S doping preparation of charcoal [39]
    图5 制备MnO2/C多孔导电支架流程示意图和沉积不同含量MnO2样品的CV曲线[66]Fig.5 Schematic diagram of the preparation process of MnO2/C porous conductive scaffold , the CV curve of samples with different contents of MnO2 [66]
    图6 全固态木材ASC的制备流程图以及ASC在20 mV/s扫描速率下获得的CV曲线和GCD曲线[76]Fig.6 Preparation flow chart of all solid wood ASC and CV curve 、GCD curve obtained by ASC at a scanning rate of 20 mV/s[76]
    图7 (CLFW)@Ni-NiS/vitrimer(V)制备流程示意图[82]Fig.7 (CLFW)@Ni-NiS/vitrimer(V) preparation process schematic diagram[82]
    图1 Layout of considered MVDC traction line.Fig.1
    图2 Load voltage profile of a single moving train along considered traction line.Fig.2
    图3 An ideal grounded traction model of DC-RES.Fig.3
    图4 Equivalent circuit of an ideal grounded traction line in DC-RES.Fig.4
    图5 Rail potential profile of train load for a single moving train.Fig.5
    图6 Stray current profile of train load for a single moving train.Fig.6
    图7 Major schemes of battery storage in RES. (a) Onboard ESS. (b) ESS at primary VSC-based TSSs. (c) ESS at mid-section between two primary VSC-based TSSs. (d) ESS along with PV at mid-section between two primary VSC-based TSSs.Fig.7
    图8 Layout of SESs at mid-section between primary VSC-based TSSs in MVDC-RES.Fig.8
    图9 Control mechanism for primary VSC-based TSS.Fig.9
    图10 MPPT control along with constant voltage control for PV system.Fig.10
    图11 Charging mode control (buck operation) of bi-directional DC-DC converter.Fig.11
    图12 Battery discharging mode control (boost operation) of bi-directional DC-DC converter.Fig.12
    图13 A 310 km line with four primary TSSs and three SESs.Fig.13
    图14 Load voltages of a single moving train along traction line.Fig.14
    图15 Eight trains randomly distributed along traction line.Fig.15
    图16 Catenary voltages for train loads as located in Fig. 15.Fig.16
    图17 New train locations along traction line.Fig.17
    图18 Catenary voltages after changing train locations as mentioned in Fig. 17.Fig.18
    图19 Shift in catenary voltages at PoC2 and PoC3 after changing train locations (without FFC).Fig.19
    图20 Shift in catenary voltages at PoC2 and PoC3 after changing train locations (with FFC).Fig.20
    图21 Catenary voltages with and without SES when a TSS is lost at end-section.Fig.21
    图22 Rail potential profile at load for a single moving train along traction line between TSS1 and TSS2 in Fig. 4.Fig.22
    图23 Stray current profile at load for a single moving train along traction line between TSS1 and TSS2 in Fig. 4.Fig.23
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  • Received:November 13,2019
  • Online: May 19,2021

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