Hybrid Power Quality Compensation System for Electric Railway Supplied by the Hypotenuse of a Scott Transformer

Zhao, Leilei; Wang, Mingli; Liu, Qiujiang; Peng, Peng; Li, Jing

doi:10.1109/access.2020.3045158

Cited by 13 publications

(6 citation statements)

References 30 publications

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“…In contrast, the microcomputer differential voltage protection is digital, which can eliminate the influence of high harmonics by software, and it has high sensitivity, a wide protection range, etc. [8]. The microcomputer-type differential pressure protection has an anti-false-action mechanism, so most of the new substations are put into use with microcomputer-type differential pressure protection.…”

Section: Microcomputer-type Differential Pressure Protectionmentioning

confidence: 99%

Causes and Solutions for the Mal-operation of Differential Pressure Protection of Substation

Liu

Yang

2023

J. Phys.: Conf. Ser.

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The capacitor compensation circuit of the traction substation is affected by high-harmonics and the differential voltage protection is frequently mal-operation, which causes serious disturbance to the railroad transportation order. In this paper, the effect of parasitic inductance of capacitor banks and the parameter characteristics under high harmonics are analyzed by establishing the high-frequency circuit structure of capacitor banks. Then, a fitting formula describing the differential voltage is established based on the measured data to describe the frequency variation characteristics of the differential voltage value. Finally, a solution to the problem of differential voltage protection mal-operation of capacitor banks is discussed, a Resistance-Capacitance filter circuit is designed, and the effectiveness is verified by simulation.

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Section: Microcomputer-type Differential Pressure Protectionmentioning

confidence: 99%

Causes and Solutions for the Mal-operation of Differential Pressure Protection of Substation

Liu

Yang

2023

J. Phys.: Conf. Ser.

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“…The hysteresis band method has been used to provide switching pulses; therefore, the precise switching frequency cannot be found, but the range of frequency variations is considered to be 4.5-15 kHz. In order to cover all possible frequencies in (8)…”

Section: Lcl Filter Design In Hpqcmentioning

confidence: 99%

“…Especially connected balancing transformers (e.g. Scott, Leblanc, modified Woodbridge and ABTT) are utilised to moderate unbalanced problems [7][8][9]. The appropriate function of mentioned connections is highly load-dependent such that the grid current balancing occurs whenever two output supplied phases are equal to each other.…”

Section: Introductionmentioning

confidence: 99%

Using C‐type filter with partial compensation method for capacity reduction of hybrid power quality conditioner in co‐phase traction power system

Habibolahzadeh

Roudsari

Jalilian

et al. 2021

IET Power Electronics

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Hybrid power quality conditioner (HPQC) has been utilised in a co-phase electrified railway system with the aim of improving power quality indices. A C-type filter is designed as an auxiliary device alongside the HPQC for high-order harmonics mitigation in this paper. Alternatively, the C-type filter compensates a selected portion of load reactive power, while the HPQC compensates for the left required power. Furthermore, the HPQC mitigates grid side unbalance and other harmonics in a co-phase supplied system simultaneously. In addition, a design procedure of LCL filters is proposed to suppress high-order harmonic contents induced by the HPQC converters to achieve lower grid-side total harmonic distortion (THD). Moreover, a flexible partial compensation (PC) method considering the C-type filter effect on the HPQC performance is adapted to maintain the grid-side power quality indices in an acceptable range. The C-type filter and PC method provide VA rating reduction of the HPQC without applying any complication to the compensation control system. Finally, simulation and experimental results are presented to validate the feasibility and functionality of the proposed configuration.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…The advanced co-phase traction power supply system (ACTPSS) based on three-phase to single-phase cascaded converter is proposed in reference [8], which can solve problems caused by the output transformer and improve the interface voltage of the converter. Reference [9] proposes a Scott transformer based hypotenuse hybrid traction power system (Scott-HHPS), which could achieve the same compensation objective with smaller active compensation capacity.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Compensation Method for Co-phase Power Supply in Electrified Railways Based on V/v Transformer and Single-phase Rotating Var Compensator

Yan,

Wu,

Shao

et al. 2024

Preprint

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To solve the problem of negative-sequence and reactive power in electrified railway, this paper proposes a comprehensive compensation method based on V/v transformers and electromagnetic single-phase var compensator (ESVC) for co-phase power supply. First, based on the principles of static var generator (SVG) and single-phase rotary phase shifting transformer (SRPST), the topology and model of ESVC have been established, and the compensation mechanism has been analyzed. Second, the topological structure and mathematical model of co-phase power comprehensive compensation device (CPCD) are put forward based on the principles of V/v transformers and ESVC, and the operation mode of CPCD in multiple scenarios is designed. Then the strategy of CPCD with double closed loop control is analyzed: corresponding compensation mode is selected according to negative-sequence unbalance degree and expected power factor value. In this strategy, the compensated current output by ESVC is taken as the quantity of external loop control, and the rotation angle of ESVC is taken as the quantity of internal loop control to realize double-closed loop control of CPCD. Finally, the comprehensive CPCD compensation model is built on the simulation platform and validated the accuracy of the mathematical model and the effectiveness of the control strategy.

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Hybrid Power Quality Compensation System for Electric Railway Supplied by the Hypotenuse of a Scott Transformer

Cited by 13 publications

References 30 publications

Causes and Solutions for the Mal-operation of Differential Pressure Protection of Substation

Causes and Solutions for the Mal-operation of Differential Pressure Protection of Substation

Using C‐type filter with partial compensation method for capacity reduction of hybrid power quality conditioner in co‐phase traction power system

Comprehensive Compensation Method for Co-phase Power Supply in Electrified Railways Based on V/v Transformer and Single-phase Rotating Var Compensator

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