Uninterruptible power systems (UPS)

2021 ◽  
Keyword(s):  
Power Systems ◽  
Uninterruptible Power

scholarly journals Novel Uninterruptible Phase-Separation Passing and Power Quality Compensation Scheme Based on Modular Multilevel Converter for Double-Track Electrified Railway

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 738
Author(s):  
Xu Tian ◽  
Xingcheng Li ◽  
Zibo Zhou
Keyword(s):  
Phase Separation ◽  
Power Systems ◽  
Power Quality ◽  
Control Method ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Electrified Railway ◽  
Uninterruptible Power ◽  
Negative Sequence Current ◽  
Double Track

Over-voltage and over-current problems of locomotives when passing phase separation and negative sequence current penetration seriously influence the safety of double-track electrified railway and public power systems. In order to solve these problems, this paper proposes a novel uninterruptible power supply phase separation passing and power quality compensation (UPSP-PQC) scheme for double-track electrified railway. Three working modes of UPSP-PQC are put forward, including uninterruptible phase separation passing mode, power quality compensation mode and uninterruptible phase separation passing priority, and power quality compensation optimum mode. A three-leg modular multilevel converter (MMC) topology of UPSP-PQC is proposed and the corresponding control strategy has been studied. PSCAD/EMTDC simulation is performed to verify the correctness and effectiveness of the proposed scheme and its control method.

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