{"title":"Wide-Band Harmonic Resonance Damping Strategy for Grid-Connected Digitally Controlled LCL-Type Inverter","authors":"Jinhong Liu, Xiaobing Zhang, Baohua Wang","doi":"10.1049/pel2.70126","DOIUrl":null,"url":null,"abstract":"<p>Digitally controlled LCL-type inverter is widely applied in grid-connected renewable energy generation system, and its harmonics resonance damping performance is critical to the stable operation and output power quality of system. Considering the low power loss and simple structure, an equivalent impedance model of digitally controlled LCL-type inverter with a widely deployed capacitor-current active damping feedback structure is built first. Then, according to the obtained model, the effects of digital time delay of control system and equivalent grid impedance on active damping performance of inverter, including effective damping region and harmonics resonance characteristics mainly, are investigated in detail. In order to improve the damping performance of digitally controlled LCL-type inverter under the action of digital time delay and grid impedance, a wide-band harmonic resonance damping strategy is proposed based on capacitor-voltage active damping structure finally. A prototype grid-connected digitally controlled LCL-type inverter system is built to verify the correctness of theoretical analysis results and effectiveness of proposed active damping strategy.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"18 1","pages":""},"PeriodicalIF":1.9000,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.70126","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IET Power Electronics","FirstCategoryId":"5","ListUrlMain":"https://ietresearch.onlinelibrary.wiley.com/doi/10.1049/pel2.70126","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
Digitally controlled LCL-type inverter is widely applied in grid-connected renewable energy generation system, and its harmonics resonance damping performance is critical to the stable operation and output power quality of system. Considering the low power loss and simple structure, an equivalent impedance model of digitally controlled LCL-type inverter with a widely deployed capacitor-current active damping feedback structure is built first. Then, according to the obtained model, the effects of digital time delay of control system and equivalent grid impedance on active damping performance of inverter, including effective damping region and harmonics resonance characteristics mainly, are investigated in detail. In order to improve the damping performance of digitally controlled LCL-type inverter under the action of digital time delay and grid impedance, a wide-band harmonic resonance damping strategy is proposed based on capacitor-voltage active damping structure finally. A prototype grid-connected digitally controlled LCL-type inverter system is built to verify the correctness of theoretical analysis results and effectiveness of proposed active damping strategy.
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
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
