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Keywords = double-carrier phase-disposition pulse width modulation

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25 pages, 2822 KB  
Article
An Improved Phase-Disposition Pulse Width Modulation Method for Hybrid Modular Multilevel Converter
by Fayun Zhou, Xinxing Xiang, Fujun Ma, Yichao Wang, Fangyuan Zhou and Peng Peng
Energies 2023, 16(3), 1192; https://doi.org/10.3390/en16031192 - 21 Jan 2023
Cited by 4 | Viewed by 2856
Abstract
The hybrid modular multilevel converter (MMC) consisting of half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs) is a promising solution for overhead lines high-voltage direct current systems (HVDC) due to the advantages of direct current short circuit fault ride-through (DC-FRT) capability. This paper proposes [...] Read more.
The hybrid modular multilevel converter (MMC) consisting of half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs) is a promising solution for overhead lines high-voltage direct current systems (HVDC) due to the advantages of direct current short circuit fault ride-through (DC-FRT) capability. This paper proposes an improved phase-disposition pulse width modulation (PDPWM) method for the hybrid modular multilevel converter. The number of carriers can be reduced from 3N (N is the number of submodules in each arm) to 6. The theoretical harmonic analysis of the improved PDPWM method for hybrid MMC is performed by using double Fourier integral analysis. The influence of three carrier displacement angles between HBSMs and FBSMs in the upper and lower arms on harmonic characteristics is investigated. The output voltage harmonics minimization PDPWM scheme and circulating current harmonics cancellation PDPWM scheme can be achieved by selecting the optimum carrier displacement angles, respectively. The proposed method for hybrid MMC is verified by the simulation and experimental results. Full article
(This article belongs to the Special Issue Power Quality Analysis and Control of Railway Power Supply Systems)
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23 pages, 3707 KB  
Article
Double-Carrier Phase-Disposition Pulse Width Modulation Method for Modular Multilevel Converters
by Fayun Zhou, An Luo, Yan Li, Qianming Xu, Zhixing He and Josep M. Guerrero
Energies 2017, 10(4), 581; https://doi.org/10.3390/en10040581 - 23 Apr 2017
Cited by 8 | Viewed by 6156
Abstract
Modular multilevel converters (MMCs) have become one of the most attractive topologies for high-voltage and high-power applications. A double-carrier phase disposition pulse width modulation (DCPDPWM) method for MMCs is proposed in this paper. Only double triangular carriers with displacement angle are needed for [...] Read more.
Modular multilevel converters (MMCs) have become one of the most attractive topologies for high-voltage and high-power applications. A double-carrier phase disposition pulse width modulation (DCPDPWM) method for MMCs is proposed in this paper. Only double triangular carriers with displacement angle are needed for DCPDPWM, one carrier for the upper arm and the other for the lower arm. Then, the theoretical analysis of DCPDPWM for MMCs is presented by using a double Fourier integral analysis method, and the Fourier series expression of phase voltage, line-to-line voltage and circulating current are deduced. Moreover, the impact of carrier displacement angle between the upper and lower arm on harmonic characteristics is revealed, and further the optimum displacement angles are specified for the circulating current harmonics cancellation scheme and output voltage harmonics minimization scheme. Finally, the proposed method and theoretical analysis are verified by simulation and experimental results. Full article
(This article belongs to the Special Issue Distribution Power Systems and Power Quality)
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15 pages, 1981 KB  
Article
A Traction Three-Phase to Single-Phase Cascade Converter Substation in an Advanced Traction Power Supply System
by Xiaoqiong He, Aiping Guo, Xu Peng, Yingying Zhou, Zhanghai Shi and Zeliang Shu
Energies 2015, 8(9), 9915-9929; https://doi.org/10.3390/en8099915 - 11 Sep 2015
Cited by 40 | Viewed by 10308
Abstract
The advanced traction power supply system (ATPSS) is a new directional development for traction power supply systems, which can totally remove the neutral sections and effectively promote power quality. However, the existing converters suffer from small substation capacity. In this paper, a new [...] Read more.
The advanced traction power supply system (ATPSS) is a new directional development for traction power supply systems, which can totally remove the neutral sections and effectively promote power quality. However, the existing converters suffer from small substation capacity. In this paper, a new configuration based on a three-level neutral point clamped (3L-NPC) three-phase to single-phase cascade converter in a substation is proposed for ATPSS, which can be used to match the capacity of the converter for high voltage and large power applications. The control strategy of the proposed converter is analyzed in depth, and the phase disposition sinusoidal pulse width modulation (PD-SPWM) with phase shift carrier SPWM (PSC-SPWM) is employed in the inverters. Then, the inductance equalizing circuit is applied for the voltage balance on the DC-link. Besides, a LC filter circuit is designed to eliminate the double line-frequency ripple of DC voltage. Afterwards, a simulation model and an experimental prototype are developed, respectively. The simulation results show that the proposed converter in this paper can not only meet the requirements of voltage and capacity for the traction network, but also improve power quality. Finally, the experimental results verify the correctness and feasibility of the proposed control strategy. Full article
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