Reduction Of Harmonic Distortion And Improvement Of Voltage Form Factor In Compensated Railway Systems by Means of a Single Arm Filter

Hu, Lei; Morrison, Robert E.; Young, D.J.

doi:10.1109/ichps.1992.559001

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…To prevent this unwanted phenomenon, several techniques are proposed to attenuate harmonic currents generated by traction converters or background harmonics coming from the three-phase upstream power grid by the research community. These include traditional passive filtering through a combination of single-tuned filters and high pass filters [5,14,21,22] or active filtering [2], an active compensation techniques using a static VAR compensator to improve power factor and regulate the voltage level, combined with filtering to attenuate the resulting harmonics [12,42], hybrid solutions consisting of a combination of active and passive filters [16,17] or from the locomotive traction drive itself by using one LCL filter to attenuate characteristic harmonics generated by the PWM locomotive converter [15]. Despite the proposed solutions, limiting the harmonic distortions in 25 kV 50 Hz rail networks still remains a challenge.…”

Section: Voltage and Current Harmonic Analysismentioning

confidence: 99%

“…It has been also possible to identify characteristic harmonics emission levels produced by traction units and quantify their influence on the excitation of network components natural resonance frequencies [5,10,11]. The latter considerations have been particularly important for network planning, decision making or proposing relevant harmonic and resonance mitigation techniques on actual running rail networks [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Power Quality Measurement and Active Harmonic Power in 25 kV 50 Hz AC Railway Systems

et al. 2020

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Railway electrical networks rated at 25 kV 50 Hz are characterised by significant levels of voltage and current harmonics. These frequency components are also time varying in nature due to the movement of trains and changing operational modes. Processing techniques used to evaluate harmonic results, although standardised, are not explicitly designed for railway applications, and the smoothing effect that the standard aggregation algorithms have on the measured results is significant. This paper analyses the application accuracy of standardised power quality (PQ) measurement algorithms, when used to measure and evaluate harmonics in railway electrical networks. A shorter aggregation time interval is proposed for railway power quality measurement instruments, which offers more accurate estimated results and improved tracking of time varying phenomena. Harmonic active power present in railway electrical networks is also evaluated in order to quantify the impact it has on the energy accumulated by electrical energy meters installed on-board trains. Analysis performed on 12 train journeys shows significant levels of non-fundamental active power developed for short periods of time. As an energy meter will inadvertently absorb the financial cost of non-fundamental energy produced by other trains or other external power flows, results are provided to support recommendations for future standards to measure only fundamental frequency energy within train energy measurement meters.

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Section: Voltage and Current Harmonic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Power Quality Measurement and Active Harmonic Power in 25 kV 50 Hz AC Railway Systems

et al. 2020

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“…To effectively alleviate the impact of electrified railways on the power quality of the utility grid, various techniques have been proposed [7][8][9][10][11][12][13][14]. Although some methods can be helpful to improve the power quality to some extent, they cannot be considered as a comprehensive approach for power quality compensation.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the compensation of reactive power and harmonics remain unsolved. Passive power quality compensators, for example, reactive power compensation capacitors and passive filters, are only able to eliminate some specific harmonics or a limited spectrum of harmonics [9].…”

Section: Introductionmentioning

confidence: 99%

Improved grid voltage sensorless control strategy for railway power conditioners

Bozorgi

Sanatkar-Chayjani

Nejad

et al. 2015

IET Power Electronics

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Rapid development of high-speed trains confronts the power grid with serious power quality problems. In this study, to compensate power quality, an improved grid voltage sensorless control method for the railway power conditioner (RPC) is proposed. The proposed control strategy utilises a moving average filter to better detect the compensating currents and a proportional-resonant controller to control the compensating currents. Moreover, a sensorless virtual flux method based on second order low-pass filters is presented to replace the AC voltage sensors. Using the proposed strategy, the dynamic and steady-state characteristic of the RPC is significantly enhanced. Through simulation tests, the effectiveness of the proposed methods is confirmed.

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“…A single tuned arm passive filter may provide average voltage compensation [7]. By applying the filter the voltage form factor may be reduced to levels close to 1.1 1 which is the form factor of a sine wave.…”

Section: Control Of the Voltage Form Factormentioning

confidence: 99%

Power quality issues on AC traction systems

Morrison

Ninth International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.00EX441)

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It is proposed that power quality in AC railway systems should consider low voltage, high voltage form factor and resonant overvoltage rather than the parameters normally considered for public utilities. Each of the 3 system aspects has a conventional means of compensation and a solution using power electronic systems. The paper describes the potential power quality problem areas on AC traction systems and possible means of compensation. The conclusion is drawn that disturbance levels on AC traction systems are likely to remain higher than disturbance within public electricity supplies to achieve lower capital cost for railway networks.

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Reduction Of Harmonic Distortion And Improvement Of Voltage Form Factor In Compensated Railway Systems by Means of a Single Arm Filter

Cited by 8 publications

References 2 publications

Power Quality Measurement and Active Harmonic Power in 25 kV 50 Hz AC Railway Systems

Power Quality Measurement and Active Harmonic Power in 25 kV 50 Hz AC Railway Systems

Improved grid voltage sensorless control strategy for railway power conditioners

Power quality issues on AC traction systems

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