{"title":"采用LLC谐振变换器的海上直流风力发电机不同时间尺度模型的构建与比较","authors":"Yujie Ning, Yijing Chen, Dawei Zhao, Chunhua Li, Xiaojiang Guo, Dongdong Zhou","doi":"10.1049/rpg2.70116","DOIUrl":null,"url":null,"abstract":"<p>Constructing an all-DC offshore wind farm with DC power generation, DC collection, and DC transmission is an important direction for the development of offshore wind power. The offshore DC wind turbine generator is the core equipment of the all-DC wind farm, and establishing its simulation models at different time scales is of great significance for conducting source-grid coordinated research. Currently, worldwide, the all-DC offshore wind farm is still in the research and development stage, with no actual engineering applications yet. Existing research mostly focuses on the topology of high-capacity DC/DC converters suitable for offshore DC wind turbines, often only paying attention to the control characteristics of the DC/DC converter, lacking research on the overall control strategy and the simulation model of the offshore DC wind turbine. This paper first compares several typical schemes of DC collection for offshore DC wind farms, pointing out that the parallel two-stage voltage boost scheme is the most technically and economically viable at this stage. It then selects a modular combination-type DC/DC converter topology based on the LLC resonant converter, presents the complete structure of the offshore DC wind turbine using this topology, establishes an electromagnetic transient model of the offshore DC wind turbine based on the LLC resonant converter, and designs its control strategy under small and large disturbances. Through simulation examples, the model's ability to maximize wind energy capture during normal operation and ensure safe and stable operation during faults is verified. Subsequently, based on the average models of the AC/DC converter and the DC/DC converter, an electromechanical transient model of the offshore DC wind turbine is established, its control strategy is designed, and the accuracy of the electromechanical transient model is verified by comparing the simulation results with those of the electromagnetic transient model. Finally, the paper presents the different application scenarios of the two established models at different time scales in the grid-connected operation research of the offshore DC wind power system and looks forward to the future research focus. The research in this paper can provide a certain reference for the field of modelling and analysis techniques for grid-connected offshore DC wind power systems.</p>","PeriodicalId":55000,"journal":{"name":"IET Renewable Power Generation","volume":"19 1","pages":""},"PeriodicalIF":2.9000,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.70116","citationCount":"0","resultStr":"{\"title\":\"Construction and Comparison of Models With Different Time Scales For Offshore DC Wind Turbine Using LLC Resonant Converter\",\"authors\":\"Yujie Ning, Yijing Chen, Dawei Zhao, Chunhua Li, Xiaojiang Guo, Dongdong Zhou\",\"doi\":\"10.1049/rpg2.70116\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Constructing an all-DC offshore wind farm with DC power generation, DC collection, and DC transmission is an important direction for the development of offshore wind power. The offshore DC wind turbine generator is the core equipment of the all-DC wind farm, and establishing its simulation models at different time scales is of great significance for conducting source-grid coordinated research. Currently, worldwide, the all-DC offshore wind farm is still in the research and development stage, with no actual engineering applications yet. Existing research mostly focuses on the topology of high-capacity DC/DC converters suitable for offshore DC wind turbines, often only paying attention to the control characteristics of the DC/DC converter, lacking research on the overall control strategy and the simulation model of the offshore DC wind turbine. This paper first compares several typical schemes of DC collection for offshore DC wind farms, pointing out that the parallel two-stage voltage boost scheme is the most technically and economically viable at this stage. It then selects a modular combination-type DC/DC converter topology based on the LLC resonant converter, presents the complete structure of the offshore DC wind turbine using this topology, establishes an electromagnetic transient model of the offshore DC wind turbine based on the LLC resonant converter, and designs its control strategy under small and large disturbances. Through simulation examples, the model's ability to maximize wind energy capture during normal operation and ensure safe and stable operation during faults is verified. Subsequently, based on the average models of the AC/DC converter and the DC/DC converter, an electromechanical transient model of the offshore DC wind turbine is established, its control strategy is designed, and the accuracy of the electromechanical transient model is verified by comparing the simulation results with those of the electromagnetic transient model. Finally, the paper presents the different application scenarios of the two established models at different time scales in the grid-connected operation research of the offshore DC wind power system and looks forward to the future research focus. The research in this paper can provide a certain reference for the field of modelling and analysis techniques for grid-connected offshore DC wind power systems.</p>\",\"PeriodicalId\":55000,\"journal\":{\"name\":\"IET Renewable Power Generation\",\"volume\":\"19 1\",\"pages\":\"\"},\"PeriodicalIF\":2.9000,\"publicationDate\":\"2025-08-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/rpg2.70116\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IET Renewable Power Generation\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://ietresearch.onlinelibrary.wiley.com/doi/10.1049/rpg2.70116\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IET Renewable Power Generation","FirstCategoryId":"5","ListUrlMain":"https://ietresearch.onlinelibrary.wiley.com/doi/10.1049/rpg2.70116","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
Construction and Comparison of Models With Different Time Scales For Offshore DC Wind Turbine Using LLC Resonant Converter
Constructing an all-DC offshore wind farm with DC power generation, DC collection, and DC transmission is an important direction for the development of offshore wind power. The offshore DC wind turbine generator is the core equipment of the all-DC wind farm, and establishing its simulation models at different time scales is of great significance for conducting source-grid coordinated research. Currently, worldwide, the all-DC offshore wind farm is still in the research and development stage, with no actual engineering applications yet. Existing research mostly focuses on the topology of high-capacity DC/DC converters suitable for offshore DC wind turbines, often only paying attention to the control characteristics of the DC/DC converter, lacking research on the overall control strategy and the simulation model of the offshore DC wind turbine. This paper first compares several typical schemes of DC collection for offshore DC wind farms, pointing out that the parallel two-stage voltage boost scheme is the most technically and economically viable at this stage. It then selects a modular combination-type DC/DC converter topology based on the LLC resonant converter, presents the complete structure of the offshore DC wind turbine using this topology, establishes an electromagnetic transient model of the offshore DC wind turbine based on the LLC resonant converter, and designs its control strategy under small and large disturbances. Through simulation examples, the model's ability to maximize wind energy capture during normal operation and ensure safe and stable operation during faults is verified. Subsequently, based on the average models of the AC/DC converter and the DC/DC converter, an electromechanical transient model of the offshore DC wind turbine is established, its control strategy is designed, and the accuracy of the electromechanical transient model is verified by comparing the simulation results with those of the electromagnetic transient model. Finally, the paper presents the different application scenarios of the two established models at different time scales in the grid-connected operation research of the offshore DC wind power system and looks forward to the future research focus. The research in this paper can provide a certain reference for the field of modelling and analysis techniques for grid-connected offshore DC wind power systems.
期刊介绍：
IET Renewable Power Generation (RPG) brings together the topics of renewable energy technology, power generation and systems integration, with techno-economic issues. All renewable energy generation technologies are within the scope of the journal.
Specific technology areas covered by the journal include:
Wind power technology and systems
Photovoltaics
Solar thermal power generation
Geothermal energy
Fuel cells
Wave power
Marine current energy
Biomass conversion and power generation
What differentiates RPG from technology specific journals is a concern with power generation and how the characteristics of the different renewable sources affect electrical power conversion, including power electronic design, integration in to power systems, and techno-economic issues. Other technologies that have a direct role in sustainable power generation such as fuel cells and energy storage are also covered, as are system control approaches such as demand side management, which facilitate the integration of renewable sources into power systems, both large and small.
The journal provides a forum for the presentation of new research, development and applications of renewable power generation. Demonstrations and experimentally based research are particularly valued, and modelling studies should as far as possible be validated so as to give confidence that the models are representative of real-world behavior. Research that explores issues where the characteristics of the renewable energy source and their control impact on the power conversion is welcome. Papers covering the wider areas of power system control and operation, including scheduling and protection that are central to the challenge of renewable power integration are particularly encouraged.
The journal is technology focused covering design, demonstration, modelling and analysis, but papers covering techno-economic issues are also of interest. Papers presenting new modelling and theory are welcome but this must be relevant to real power systems and power generation. Most papers are expected to include significant novelty of approach or application that has general applicability, and where appropriate include experimental results. Critical reviews of relevant topics are also invited and these would be expected to be comprehensive and fully referenced.
Current Special Issue. Call for papers:
Power Quality and Protection in Renewable Energy Systems and Microgrids - https://digital-library.theiet.org/files/IET_RPG_CFP_PQPRESM.pdf
Energy and Rail/Road Transportation Integrated Development - https://digital-library.theiet.org/files/IET_RPG_CFP_ERTID.pdf
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