Open AccessEnergy storage traction power supply system and control strategy for an electrified railway
Author(s) -
Chen Minwu,
Cheng Yilin,
Cheng Zhe,
Zhang Diya,
Lv Yabo,
Liu Ruofei
Publication year - 2020
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2019.1540
Subject(s) - energy storage , regenerative brake , traction (geology) , automotive engineering , supercapacitor , capacitor , traction power network , control system , controller (irrigation) , power (physics) , computer science , control theory (sociology) , engineering , control (management) , electrical engineering , voltage , mechanical engineering , brake , capacitance , chemistry , physics , quantum mechanics , artificial intelligence , agronomy , electrode , biology
To solve the negative sequence (NS) problem and enhance the regenerative braking energy (RBE) utilisation in an electrified railway, a novel energy storage traction power supply system (ESTPSS) is proposed in this study. In the new system, a power flow controller is adopted to compensate for the NS, and a super‐capacitor energy storage system is applied to absorb and release the RBE. In addition, through the cooperation of each part, the proposed power supply system can provide continuous power without neutral sections. The NS compensation principle of the new system is illustrated. Depending on the operational state of the traction load, the control model is presented for different working patterns, including a regenerative braking pattern, a peak clipping pattern and a valley filling pattern. Moreover, a hierarchical control strategy including upper energy management and low‐layer converter control is proposed, which effectively coordinate switches between the different working patterns. Finally, the validity of the control method and the excellent performance of the system are demonstrated by a case study. The results indicate that compared to a conventional TPSS, the ESTPSS increases the RBE utilisation of the system by 83%.