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Keywords = series multi-pulse rectifier

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27 pages, 12524 KB  
Article
The Study of Multi-Terminal DC Systems in an Offshore Wind Environment: A Focus on Cable Ripple Analysis
by Xiaoyun Rong, Jonathan K. H. Shek, D. Ewen Macpherson and Phil Mawby
Energies 2024, 17(8), 1978; https://doi.org/10.3390/en17081978 - 22 Apr 2024
Viewed by 1447
Abstract
This paper studies the THD and AC losses on the DC cables of offshore wind farm-based multi-terminal HVDC systems when they extract and deliver power from and to more than one connection point. In the paper, the study of a full system PLECS [...] Read more.
This paper studies the THD and AC losses on the DC cables of offshore wind farm-based multi-terminal HVDC systems when they extract and deliver power from and to more than one connection point. In the paper, the study of a full system PLECS + Simulink model with two branches, including a wind resource, a wind turbine, a Permanent Magnet Synchronous Generator (PMSG), a Pulse Width Modulation (PWM) rectifier, a Single Active Bridge (SAB) DC–DC converter, an Input Parallel Output Series (IPOS) DC–DC converter, HVDC cables, and a simplified onshore system, is presented. It focuses on the investigation of the output ripple content of multiple DC–DC converters on DC cables under different wind conditions with different voltage and power ratings. The importance of the study is providing a general understanding of the operation of the innovative offshore wind farm-based DC system, as well as the interaction between different DC–DC converters and their influence on cable ripple content under different situations. Full article
(This article belongs to the Collection Women's Research in Wind and Ocean Energy)
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15 pages, 5446 KB  
Article
A Novel Series 24-Pulse Rectifier Operating in Low Harmonic State Based on Auxiliary Passive Injection at DC Side
by Xiaoqiang Chen, Tun Bai, Ying Wang, Jiangyun Gong, Xiuqing Mu and Zhanning Chang
Electronics 2024, 13(6), 1160; https://doi.org/10.3390/electronics13061160 - 21 Mar 2024
Cited by 5 | Viewed by 2837
Abstract
To reduce the current harmonics on the input side of a multi-pulse rectifier, this paper proposes a low harmonic current source series multi-pulse rectifier based on an auxiliary passive injection circuit at the DC side. The rectifier only needs to add an auxiliary [...] Read more.
To reduce the current harmonics on the input side of a multi-pulse rectifier, this paper proposes a low harmonic current source series multi-pulse rectifier based on an auxiliary passive injection circuit at the DC side. The rectifier only needs to add an auxiliary passive injection circuit on the DC side of the series 12-pulse rectifier, which can change its AC input voltage from 12-step waves to 24-step waves. We analyzed the working mode of the rectifier, optimized the optimal turn ratio of the injection transformer from the perspective of minimizing the total harmonic distortion (THD) value of the input voltage on the AC side, and analyzed the diode open circuit fault in the auxiliary passive injection circuit. Test verification shows that, after using the passive harmonic injection circuit, the THD value of the input voltage of the AC side of the rectifier is reduced from 14.03% to 4.86%. The THD value of the input current is reduced from 5.30% to 2.16%. The input power factor has been increased from 98.86% to 99.83%, and the power quality has been improved. Full article
(This article belongs to the Special Issue Advanced Technologies in Power Electronics and Electric Drives)
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14 pages, 5974 KB  
Article
Hybrid Harmonic Suppression Method at DC Link of Series-Connected 18-Pulse Rectifier
by Quanhui Li, Xinyu Yin, Fangang Meng, Xiao He, Gaojie Wang and Changxing Guo
Appl. Sci. 2022, 12(11), 5544; https://doi.org/10.3390/app12115544 - 30 May 2022
Cited by 4 | Viewed by 2473
Abstract
To suppress the harmonics of series-connected 18-pulse rectifier, a hybrid harmonic suppression method is proposed in this paper. According to the structure of the converter and the KVL, the injection voltages are expressed. According to the injection voltages, the relation between the input [...] Read more.
To suppress the harmonics of series-connected 18-pulse rectifier, a hybrid harmonic suppression method is proposed in this paper. According to the structure of the converter and the KVL, the injection voltages are expressed. According to the injection voltages, the relation between the input voltage THD and the injection transformer turn ratio is obtained. Based on the relationship, when the THD of the input voltage researches the lowest value, the optimal injection transformer turn ratio is determined. Testing result shows that after using the proposed reduction method, the input side THD values of the converter are reduced. The capacity of the suppression circuit is only about 2% of the load power. The proposed converter is qualified for the interface between the AC generator and the DC bus of the aircraft electrical system. Full article
(This article belongs to the Special Issue Challenges for Power Electronics Converters)
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