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

Tian, Xu; Li, Xingcheng; Zhou, Zhen-Gong

doi:10.3390/en13030738

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…A detection method of train's pantograph position is proposed in ANS system [15], but its accuracy is easily impacted by mutual impedance, voltage fluctuations and overvoltages of the OCS [16][17][18][19]. A three-leg MMC converter-based uninterruptible power supply solution is proposed [20], and it needs a large number of half-bridge submodules, which results in complex control and expensive cost. Different methods have been proposed to suppress electromagnetic transients.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic transient suppression for thyristor switch‐based auto‐passing neutral section system

Liran,

Mingli,

Qiujiang

et al. 2023

IET Power Electronics

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The auto‐passing neutral section (ANS), applied in the traction substation or section post (SP), is one of the effective methods to improve the continuity of power supply, and the electromagnetic transient is the key issue impacting its application value. An equivalent switching circuit is established to reveal the causes of the electromagnetic transient. The suppression methods for reducing transient overvoltage and inrush current are proposed, adopting an improved RLC filter to suppress the transient overvoltage with low active power loss, and a switching strategy to minimize magnetic flux variation. The correctness of the proposed methods has been confirmed by simulation and experimental results, which can improve the transient performance and increase the practicality of the ANS.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic transient suppression for thyristor switch‐based auto‐passing neutral section system

Liran,

Mingli,

Qiujiang

et al. 2023

IET Power Electronics

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The Improved Unified Power Quality Conditioner with the Modular Multilevel Converter for Power Quality Improvement

Thentral

Palanisamy

Usha

et al. 2022

International Transactions on Electrical Energy Systems

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Nowadays, researchers focus on the modular multilevel converter (MMC), due to its modularity structure, effective sharing of voltages among the submodule switches, and betterment in the quality of the voltage and current waveforms. First, the conventional unified power quality conditioner is developed with two level voltage source converters connected back-to-back, which are proposed to mitigate both the voltage and current related power quality problems. Later, to improve the performances (voltage sag, swell, current harmonics, etc.) of the conventional method, multilevel inverters are used. In this paper, a modified unified power quality conditioner based on a modular multilevel converter is implemented to mitigate the voltage and current related power quality issues. The design of the MMC is very simple with a modular structure, and it also improves the performance of the system compared to the conventional methods. In this proposed topology, the voltage related compensation is implemented with a seven-level MMC, and the current compensation is achieved with a reduced four switch voltage source inverter. The developed system is simulated in the MATLAB platform, and results are validated by hardware implementation with a FPGA controller. It is observed that the developed system has less % of total harmonic distortion and reduction in voltage sag as per the prescribed IEEE 519–2014 standards and practices.

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A Novel Co-Phase Power Supply System for Electrified Railway Based on V Type Connection Traction Transformer

2021

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Power quality and neutral section are two technical problems that hinder the development of electrified railway to high-speed and heavy railway. The co-phase power supply technology is one of the best ways to solve these two technical problems. At present, a V type connection traction transformer is widely used in a power frequency single-phase AC traction power supply system, especially in high-speed railway. In this paper, a new type of co-phase power supply system for electrified railway based on V type connection traction transformer is proposed. One single-phase winding in the V type connection traction transformer is used as main power supply channel, and three ports are used as compensation ports. Neutral section is no longer set with traction substation, and the train is continuously powered through. The independent single-phase Static Var Generators (SVGs) are used to compensate the three-phase imbalance caused by single-phase traction load. When necessary, the power factor can be improved at the same time. The principle, structure, control strategy, and capacity configuration of the technical scheme are analyzed in this paper, and the effectiveness of the scheme is verified by using the measured data of electrified railway. The advantage of this scheme lies in the universal applicability of the V type connection traction transformer, and the flexibility of the SVG device.

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

Cited by 3 publications

References 23 publications

Electromagnetic transient suppression for thyristor switch‐based auto‐passing neutral section system

Electromagnetic transient suppression for thyristor switch‐based auto‐passing neutral section system

The Improved Unified Power Quality Conditioner with the Modular Multilevel Converter for Power Quality Improvement

A Novel Co-Phase Power Supply System for Electrified Railway Based on V Type Connection Traction Transformer

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