Improved grid voltage sensorless control strategy for railway power conditioners

Bozorgi, Amir Masoud; Sanatkar-Chayjani, Majid; Nejad, Reza Mohammad; Monfared, Mohammad

doi:10.1049/iet-pel.2014.0673

Cited by 26 publications

(15 citation statements)

References 27 publications

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“…The main objective of the compensation principle is to calculate the compensation current references irx * , iry * which the SRPC should inject for both load sections (x) and (y) to compensate the NSCs of currents and harmonics [10]. As in the case of RPC, the SRPC is also able to carry half of the load sections currents difference, from the highly loaded section to the lightly loaded one [3].…”

Section: Srpc Compensation Principle and Analysismentioning

confidence: 99%

“…(11) and after considering a modulation index value m equals to 0.75, the MMC DC-bus voltage has the value of 3.8 kV and it is divided between N SMs. Considering the voltage drop across the arm buffer inductance, MMC SM voltage has the value around 900 V. Buffer inductance and SM capacitor values could be estimated from equation (9) and (10) respectively. Then, the SRPC model parameters have the values in TABLE II.…”

Section: B Sm Capacitor and Dc-bus Capacitors Designmentioning

confidence: 99%

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Simplified rail power conditioner based on a half-bridge indirect AC/DC/AC Modular Multilevel Converter and a V/V power transformer

Tanta

Monteiro

Exposto

et al. 2017

IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society

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This paper presents a comprehensive study about a Simplified Rail Power Conditioner (SRPC) based on a half-bridge indirect AC/DC/AC Modular Multilevel Converter (MMC) and a V/V traction power transformer. The proposed system with a half-bridge MMC can decrease the costs, reduce the control complexity, and require less hardware devices in comparison with the rail power conditioner based on a full-bridge indirect AC/DC/AC MMC. Moreover, the SRPC with a half-bridge MMC is able to compensate current harmonics, reactive power, and the Negative Sequence Components (NSCs) of currents, which are caused by the unbalance loads between power grid phases. This paper explains the system architecture and its control algorithms based on a pulse-width modulation and a proportional-integral controller, which is used to control the compensation currents. The simulation results of the SRPC show the submodule voltage balancing control and the DC-bus voltage control in order to verify its effectiveness. The compensation strategy based on the NSCs detection is described and evaluated through simulation results.

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Section: Srpc Compensation Principle and Analysismentioning

confidence: 99%

Section: B Sm Capacitor and Dc-bus Capacitors Designmentioning

confidence: 99%

Simplified rail power conditioner based on a half-bridge indirect AC/DC/AC Modular Multilevel Converter and a V/V power transformer

Tanta

Monteiro

Exposto

et al. 2017

IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society

View full text Add to dashboard Cite

show abstract

“…This energy storage system is useful for reducing the peak power demand and the operation costs in a railway substation. In [12], an improved grid voltage sensorless control strategy for the RPC system is proposed to replace the AC voltage sensors by a virtual flux method based on second-order low-pass filters. .…”

Section: Introductionmentioning

confidence: 99%

Topologies and Operation Modes of Rail Power Conditioners in AC Traction Grids: Review and Comprehensive Comparison

et al. 2020

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Electric locomotives in AC traction power systems represent a huge single-phase non-linear load and, detrimentally, affect the power quality and the efficiency of the three-phase power grid. Nevertheless, along the last decades, power electronics are being used to mitigate power quality problems in the three-phase power grid. In particular, Rail Power Conditioner (RPC) helps to increase the loading capacity of traction substations and improve the power quality of three-phase power grids. As the main characteristics, an RPC can supply reactive power, suppress current harmonics and overcome currents imbalance of the three-phase power grid. On the other hand, the traction substations may be constituted by different types of power transformers. For instance, single-phase power transformers and open-delta (V/V) power transformers are widely used, while Scott power transformers are less frequently used, since they are more complex and expensive. In this framework, this work presents a review study of RPC topologies, including their operation modes, and a comprehensive comparison between the characteristics of the RPC topologies when using different types of AC traction substations and power transformers. This helps to ensure the correct selection of the RPC topology for a specific application, according to the main structure of the traction substation. Consequently, and based on the established review, it is possible to sort and allocate each RPC topology for limited or wider applications.

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“…In order to overcome this problem, proportional resonant current controller (PRCC) techniques have been successfully investigated and validated [18,19]. In the present paper, a two-stage inverter will be adopted in terms of the grid current quality and steady-state error of the output voltage.…”

Section: Introductionmentioning

confidence: 99%

Design and control of an LCL-type single-phase grid-connected inverter withinverter current feedback using the phase-delay method

Evran¹

2019

Turk J Elec Eng & Comp Sci

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In this study, a novel single-phase grid-connected microinverter system and its control applications are introduced for solar energy systems. The proposed system consists of two stages to transfer solar power to the grid. In the first stage, an isolated high-gain DC/DC converter is used to increase low solar panel output voltage. In the second stage, an inverter is used to supply a sinusoidal current to the grid. Moreover, a proportional resonant controller is adopted to reduce grid current total harmonic distortions (THDs) and an LCL filter is used to provide better harmonic attenuation. However, the ratio between the sampling frequency fs and the resonance frequency fres should be greater than 6 in the LCL filter with the inverter current feedback for a stable system. In order to obtain higher phase margins, the sampling frequency should be increased, which increases the inverter switching frequency. The present study shows that fs/fres can be lower than 6 by placing a phase delay on the inverter current feedback path to guarantee adequate stability margins. The effectiveness and feasibility of the proposed method are confirmed by the experimental test results based on a 300-W laboratory prototype.

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Improved grid voltage sensorless control strategy for railway power conditioners

Cited by 26 publications

References 27 publications

Simplified rail power conditioner based on a half-bridge indirect AC/DC/AC Modular Multilevel Converter and a V/V power transformer

Simplified rail power conditioner based on a half-bridge indirect AC/DC/AC Modular Multilevel Converter and a V/V power transformer

Topologies and Operation Modes of Rail Power Conditioners in AC Traction Grids: Review and Comprehensive Comparison

Design and control of an LCL-type single-phase grid-connected inverter withinverter current feedback using the phase-delay method

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