{"title":"A capacitance reduction method of hybrid modular multilevel converter based on multi-harmonic voltage injection","authors":"Hongxu Li, Qin Wang, Qunfang Wu, Lan Xiao, Jinbo Li, Qi Chen","doi":"10.1049/pel2.12722","DOIUrl":null,"url":null,"abstract":"<p>In a modular multilevel converter (MMC) system, the sub-module (SM) capacitors account for a large proportion of cost, volume and weight. Increasing modulation index (<i>m</i>) is an effective method to reducing the capacitance. Traditional MMC based on half-bridge SM (HBSM) cannot boosting <i>m</i> while the hybrid MMC composed of HBSMs and full-bridge sub-modules (FBSM) can increase the <i>m</i>. The negative voltage is required when hybrid MMC works at the boosted <i>m</i>, which is only provided by the FBSMs because the HBSMs cannot output negative voltage. Therefore, appropriate control strategies are needed to achieve the normal operation of hybrid MMC under boosted <i>m</i>. This paper presents a control method suitable for hybrid MMC with high <i>m</i> based on multi-harmonic voltage injection. The <i>m</i> is increased to 1.41 with the proposed multi-harmonic voltage injection. Compared with the HBSM-MMC, the proposed method reduces the total capacitance by more than 32%. Boosting <i>m</i> also reduces the RMS and peak value of the arm current by 18%. A comprehensive comparison was presented to demonstrate the cost and effect. Simulation and experiment verified the proposed method.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"17 13","pages":"1645-1654"},"PeriodicalIF":1.9000,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12722","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IET Power Electronics","FirstCategoryId":"5","ListUrlMain":"https://ietresearch.onlinelibrary.wiley.com/doi/10.1049/pel2.12722","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
In a modular multilevel converter (MMC) system, the sub-module (SM) capacitors account for a large proportion of cost, volume and weight. Increasing modulation index (m) is an effective method to reducing the capacitance. Traditional MMC based on half-bridge SM (HBSM) cannot boosting m while the hybrid MMC composed of HBSMs and full-bridge sub-modules (FBSM) can increase the m. The negative voltage is required when hybrid MMC works at the boosted m, which is only provided by the FBSMs because the HBSMs cannot output negative voltage. Therefore, appropriate control strategies are needed to achieve the normal operation of hybrid MMC under boosted m. This paper presents a control method suitable for hybrid MMC with high m based on multi-harmonic voltage injection. The m is increased to 1.41 with the proposed multi-harmonic voltage injection. Compared with the HBSM-MMC, the proposed method reduces the total capacitance by more than 32%. Boosting m also reduces the RMS and peak value of the arm current by 18%. A comprehensive comparison was presented to demonstrate the cost and effect. Simulation and experiment verified the proposed method.
期刊介绍：
IET Power Electronics aims to attract original research papers, short communications, review articles and power electronics related educational studies. The scope covers applications and technologies in the field of power electronics with special focus on cost-effective, efficient, power dense, environmental friendly and robust solutions, which includes:
Applications:
Electric drives/generators, renewable energy, industrial and consumable applications (including lighting, welding, heating, sub-sea applications, drilling and others), medical and military apparatus, utility applications, transport and space application, energy harvesting, telecommunications, energy storage management systems, home appliances.
Technologies:
Circuits: all type of converter topologies for low and high power applications including but not limited to: inverter, rectifier, dc/dc converter, power supplies, UPS, ac/ac converter, resonant converter, high frequency converter, hybrid converter, multilevel converter, power factor correction circuits and other advanced topologies.
Components and Materials: switching devices and their control, inductors, sensors, transformers, capacitors, resistors, thermal management, filters, fuses and protection elements and other novel low-cost efficient components/materials.
Control: techniques for controlling, analysing, modelling and/or simulation of power electronics circuits and complete power electronics systems.
Design/Manufacturing/Testing: new multi-domain modelling, assembling and packaging technologies, advanced testing techniques.
Environmental Impact: Electromagnetic Interference (EMI) reduction techniques, Electromagnetic Compatibility (EMC), limiting acoustic noise and vibration, recycling techniques, use of non-rare material.
Education: teaching methods, programme and course design, use of technology in power electronics teaching, virtual laboratory and e-learning and fields within the scope of interest.
Special Issues. Current Call for papers:
Harmonic Mitigation Techniques and Grid Robustness in Power Electronic-Based Power Systems - https://digital-library.theiet.org/files/IET_PEL_CFP_HMTGRPEPS.pdf
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