Full Degree of Freedom Based Control Scheme of the Single-Phase Direct AC–AC Modular Multilevel Converter for Railway Power Conditioning Under Asymmetric Branch Conditions

Lei, Ming; Li, Yaohua; Zhao, Cong; Li, Zixin; Xu, Fei; Gao, Fanqiang; Wang, Ping

doi:10.1109/tie.2019.2903771

Cited by 11 publications

(8 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(7) where H i hss are the frequency-shifted copies of the H i (s) = k pi + k ii s ⁄ . Substituting ( 5) and ( 6) into ( 7) yields (8), and by applying the Park transformation at fundamental frequency to (8), the three-phase modulation voltage ∆u gx hss* can be obtained in (9)…”

Section: ) Hss Model Of the Power Controlmentioning

confidence: 99%

“…What's more, extreme unbalanced branch conditions are very common in the distribution system. For example, Ref [9] reported an asymmetric MMC case with Aphase inductance nearly 3 times smaller than the B-/C-phase, which happened in a railway electrical system.…”

Section: Casementioning

confidence: 99%

“…However, most of them are focused on the three-phase symmetric operating states, while the asymmetric operating states have not been paid much attention. Typical asymmetric issues [9] of the MMC family include discrepancy of branch inductor parameters, asymmetry of branch submodules (SM) numbers in case of SM failures, inequality of capacitor voltage, dynamic load condition, unbalanced ac-grid condition, etc. Under asymmetric conditions, the internal dynamics of the MMC will become much more complicated, because of current waveform distortion, voltage ripple aggravation and multi-frequency couplings [10]- [12], etc.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Block Diagonal Dominance-Based Model Reduction Method Applied to MMC Asymmetric Stability Analysis

Zong

Zhang

Lyu

et al. 2021

IEEE Trans. Energy Convers.

View full text Add to dashboard Cite

General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

show abstract

Section: ) Hss Model Of the Power Controlmentioning

confidence: 99%

Section: Casementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Block Diagonal Dominance-Based Model Reduction Method Applied to MMC Asymmetric Stability Analysis

Zong

Zhang

Lyu

et al. 2021

IEEE Trans. Energy Convers.

View full text Add to dashboard Cite

show abstract

“…The modular multilevel converter is one of the efficient converters as compared to other multilevel converters due to the presence of submodules. These submodules reduced the cost of converter as well as reduced the size of converter [Lei, M. et al, 2020]. There are different types of submodule used in MMC such as half-bridge submodule, full-bridge submodule, flying capacitance, neutral point clamp, etc.…”

Section: Mathematical Analysis Of Modular Multilevel Converter (Mmc) Fed Bldc Motormentioning

confidence: 99%

Design and Development of Experimental Based Phase Modulated Model Predictive Control for Torque Ripple Reduction of MMC Fed BLDC Motor

Jaiswal

Agarwal²,

Negi³

et al. 2021

JER is an international, peer-reviewed journal that publishes f

View full text Add to dashboard Cite

This article represents the torque ripple performance of modular multilevel converter (MMC) fed brushless dc (BLDC) motor using different current control technique. For reducing the ripple current in BLDC motor, a phase-modulated model predictive control (PMMPC) technique has been proposed. The stator ripple current is almost negligible using PMMPC. This PMMPC current control method is a significant minimization of torque ripple in BLDC motor. A comparative torque ripple behaviour of MMC fed BLDC motor has been done using phase-modulated model predictive control, model predictive control (MPC) and proportional integral (PI) control at different switching frequency. It has been observed that a PMMPC current control technique is more efficient as compared to the MPC as well as PI current control technique. It has also been observed that the torque ripple performance is improved while using PMMPC as compared to the MPC and PI controller. Simulation results have been verified with the help of experimental result and these results are obtained in good agreement to the simulated results.

show abstract

“…[24], RPCs with different topologies are compared for an optimal selection. In addition to the back-to-back converter, a direct single-phase AC/AC modular multilevel converter, in which full bridge submodule is used, is also developed to solve the issues caused by unbalanced traction loads [25]. For the 16.7Hz railway system in Germany, a direct three-phase to single-phase AC/AC MMC scheme is proposed [26].…”

Section: Introductionmentioning

confidence: 99%

Novel double‐layer DC/AC railway traction power supply system with renewable integration

Zhang

et al. 2020

IET Renewable Power Generation

View full text Add to dashboard Cite

Back-to-back converter based railway traction power supply system (TPSS) can eliminate neutral sections in the traction side and improve power quality in the grid side, but it still has some drawbacks such as low reliability, difficulty in accepting largecapacity renewable energy, and power mismatches. In this paper, a double-layer DC/AC TPSS with renewable integration is proposed to address these challenges and to improve system performance. The proposed topology breaks the limit of back-toback structure and enables more flexible free energy flow. A top-down system design method is proposed in this paper. Firstly, the characteristics of the proposed TPSS for integration with renewable power are described and compared with the traditional back-to-back topology. Secondly, a DC droop controller and a AC droop controller are designed for DC layer grid and AC layer grid respectively to control the power flow in each layer. The traditional AC droop control is based on the inductive transmission impedance, but the resistance of traction transmission line cannot be ignored. Thus a modified droop control strategy with the consideration of line resistance is also proposed in this paper. Subsequently, the voltage control strategy for the single MMC converter is designed to track the reference signal from the upper droop controller. Finally, a general double-layer DC/AC TPSS is designed from bottom to top, and the simulation results confirm that the proposed TPSS with renewable integration is capable of delivering desirable performance.

show abstract

Full Degree of Freedom Based Control Scheme of the Single-Phase Direct AC–AC Modular Multilevel Converter for Railway Power Conditioning Under Asymmetric Branch Conditions

Cited by 11 publications

References 29 publications

Block Diagonal Dominance-Based Model Reduction Method Applied to MMC Asymmetric Stability Analysis

Block Diagonal Dominance-Based Model Reduction Method Applied to MMC Asymmetric Stability Analysis

Design and Development of Experimental Based Phase Modulated Model Predictive Control for Torque Ripple Reduction of MMC Fed BLDC Motor

Novel double‐layer DC/AC railway traction power supply system with renewable integration

Contact Info

Product

Resources

About