Filter Design for Harmonic Reduction in High-Voltage Booster for Railway Applications

Zanotto, L.; Piovan, R.; Toigo, V.; Gaio, E.; Bordignon, P.; Consani, T.; Fracchia, M.

doi:10.1109/tpwrd.2004.835054

Cited by 21 publications

(9 citation statements)

References 1 publication

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“…In [22,23], strategies are presented to include compensation systems at the end of a traction section feeder. In [24], the 3 kV increase in the minimum voltage in the catenary is highlighted, with further details of this project in [25]. However, this improvement is achieved with a system occupying a very large area.…”

Section: Literature Reviewmentioning

confidence: 99%

New Reactive Power Compensation Strategies for Railway Infrastructure Capacity Increasing

et al. 2020

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In AC railway electrification systems, the impact of reactive power flow in the feeding voltage magnitude is one aspect contributing to the quality of supply degradation. Specifically, this issue results in limitations in the infrastructure capacity, either in the maximum number of trains and in maximum train power. In this paper, two reactive power compensation strategies are presented and compared, in terms of the theoretical railway infrastructure capacity. The first strategy considers a static VAR compensator, located in the neutral zone and compensating the substation reactive power, achieving a maximum capacity increase up to 50% without depending on each train active power. The second strategy adapts each train reactive power, achieving also a capacity increase around 50%, only with an increase of the train apparent power below 10%. With a smart metering infrastructure, the implementation of such compensation strategy is viable, satisfying the requirements of real-time knowledge of the railway electrification system state. Specifically, the usage of droop curves to adapt in real time the compensation scheme can bring the operation closer to optimality. Thus, the quality of supply and the infrastructure capacity can be increased with a mobile reactive power compensation scheme, based on a smart metering framework.

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Section: Literature Reviewmentioning

confidence: 99%

New Reactive Power Compensation Strategies for Railway Infrastructure Capacity Increasing

et al. 2020

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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%

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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“…The PPF consists of a xed capacitor which is connected in series with a reactor. As each harmonic component needs a filtering circuit, the costs will increase and a resonance may be caused (Zanotto et al, 2005). APFs and hybrid active power lters (HAPFs) were developed to solve the above problems (Luo et al, 2009;Herrera and Salmern, 2009;Asiminoaei et al, 2008;Szromba, 2007;Andrzej, 2004).…”

Section: Introductionmentioning

confidence: 99%

A multi-valve controlled saturable reactor and its harmonic optimization

Wang

Chen²

2014

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -As arc suppression coils (ASCs), magnetically controlled reactors (MCRs) are usually operated in the single-phase mode. Due to the lack of a third order harmonic compensation circuit, the current harmonics are high. The purpose of this paper is to propose a novel structure of MCR and a genetic algorithm (GA) to determine the parameters which will result in minimum total harmonics. Design/methodology/approach -This paper proposes the structure and the working principle of the multi-valve controlled saturable reactor (MCSR). There are several sorts of magnetic valves in the iron cores of the MCSR. The saturation degree of each magnetic valve is different when the same direct component of the magnetic flux is generated in the iron core, therefore current harmonics of different phases emerging, i.e. the total harmonics can be reduced. The magnetization characteristics and the mathematical model of the current harmonics of the MCSR are presented by introducing three parameters. The optimal values of the parameters that result in the smallest total harmonic distortion in the output current are calculated by a GA. Findings -The simulation and experimental results are coincident with the theoretical analyses, which prove the effectiveness of the proposed method on harmonic suppression. Practical implications -The method proposed in this paper can successfully reduce the current harmonics of the conventional MCR, including but not limited to the ASC. A prototype MCSR (540 kVA/10 kV) has been designed and constructed. Originality/value -In this paper, a MCSR is proposed. The mathematical model of the MCSR for harmonic analysis is developed. The optimal parameters that result in the smallest THD in the output current are calculated. The mathematical model can be also used for the harmonic analysis of conventional MCRs.

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Filter Design for Harmonic Reduction in High-Voltage Booster for Railway Applications

Cited by 21 publications

References 1 publication

New Reactive Power Compensation Strategies for Railway Infrastructure Capacity Increasing

New Reactive Power Compensation Strategies for Railway Infrastructure Capacity Increasing

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

A multi-valve controlled saturable reactor and its harmonic optimization

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