{"title":"Hybrid-Frequency Power Loop to Eliminate Negative-Sequence Current for Star-Connected Cascaded H-Bridge STATCOM","authors":"Zhendong Ji, Kangli Liu, Wei Liu, Yichao Sun, Dongye Li, Jianhua Wang, Xiaodan Wu, Jianfeng Zhao","doi":"10.1049/pel2.70060","DOIUrl":null,"url":null,"abstract":"<p>Since the power grid frequently experiences asymmetric operation caused by the unbalanced power load, the current compensation for the negative-sequence component is typically required to control the star-connected cascaded H-bridge STATCOM. However, the compensation range of the negative-sequence current injection is usually limited. This paper proposes a novel STATCOM topology by adding an interphase high-frequency power loop to extend the compensation range. It only adds two groups of RLC resonators, upon which the extra high-frequency resonant voltage is injected to transfer and redistribute power among the three phases. A control strategy considering the hybrid-frequency power loop is further proposed by analysing the proposed working principle of the proposed structure. In addition, comprehensive quantitative assessments, including the compensation capability for the negative-sequence current, the added volume/weight, and system efficiency, are conducted and compared. Finally, the comparative experimental results verify the effectiveness of the proposed analysis and method.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.9000,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70060","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IET Power Electronics","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1049/pel2.70060","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
Since the power grid frequently experiences asymmetric operation caused by the unbalanced power load, the current compensation for the negative-sequence component is typically required to control the star-connected cascaded H-bridge STATCOM. However, the compensation range of the negative-sequence current injection is usually limited. This paper proposes a novel STATCOM topology by adding an interphase high-frequency power loop to extend the compensation range. It only adds two groups of RLC resonators, upon which the extra high-frequency resonant voltage is injected to transfer and redistribute power among the three phases. A control strategy considering the hybrid-frequency power loop is further proposed by analysing the proposed working principle of the proposed structure. In addition, comprehensive quantitative assessments, including the compensation capability for the negative-sequence current, the added volume/weight, and system efficiency, are conducted and compared. Finally, the comparative experimental results verify the effectiveness of the proposed analysis and 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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