IEEE PEDG 2023

Tutorial Title: Modeling, Analysis and Suppression of Wideband Oscillations in Wind Farms Integrated with Ac/DC Transmission

With the increasing penetration of wind power generation, the dynamic characteristics of the power system have been witnessed a significant change. When integrating large-scale wind power plants, especially for the offshore wind farms, the high-voltage direct current (HVDC) transmission is preferred and practical projects based on the modular multilevel converter (MMC) for wind farms have been globally put into operation or under construction. In China, several key projects with the capacity of more than 1000 MW are being built. However, the wideband oscillatory phenomena arising from the interactions between the wind farm and the MMC-HVDC system have been frequently observed and reported in practical systems. The issue has become the hot topic and extensive research has been conducted in recent years. This tutorial will discuss how to model, analyze and mitigate the interactive oscillations occurred in the interconnected system of wind farm and AC/DC transmission using the impedance approach.

This tutorial will begin with an introduction to the oscillatory phenomena occurred in several practical systems in China. Then, a systematic introduction to the basic theory of impedance modeling and impedance-based method will be given. Afterward, the detailed impedance modeling of the doubly-fed induction generator (DFIG) based and permanent-magnetic synchronous generator (PMSG) based wind energy conversion systems will be elaborated, and the small-signal stability of them with weak AC grids will be analyzed. Next, the impedance modeling of the MMC including internal dynamics and all control loops will be presented using the harmonic state-space (HSS) modeling method. Subsequently, the factors exhibiting significant impacts on the wideband impedance characteristics of the MMC will then be discussed. For interaction analysis, the aggregation modeling of wind farm for wideband oscillations analysis will be first introduced and discussed. On this basis, the mechanisms of wideband oscillations in the offshore wind farm-MMC interconnected system will then be revealed with special focuses on the discussion of the main influencing factors. Finally, to alleviate the afore-identified oscillation issues, some stabilization control methods for improving the stability of the interconnected system will be discussed.

Presenters’ Information

    Jing Lyu, Shanghai Jiao Tong University, China

    Jing Lyu was a Postdoctoral Research Fellow with the Department of Engineering Cybernetics, Norwegian University of Science and Technology, Trondheim, Norway, from 2016 to 2017. From 2018 to 2021, he was a tenure-track Assistant Professor with the Department of Electrical Engineering, Shanghai Jiao Tong University, where he is currently a tenure-track Associate Professor. His current research interests include dynamic stability of HVDC connected renewable energy and application of artificial intelligence in power electronic systems.

    Dr. Lyu has been closely working with several leading companies in China on the stability and control of MMC-based HVDC systems for wind farms/PV plants, which aims at dealing with the wideband oscillation problems occurred in practical systems. He has published more than 90 technical papers in the field of wind power generation and HVDC transmission. He is the recipient of 2020 Premium Award for Best Paper in IET Generation, Transmission & Distribution.


    Chen Zhang, Shanghai Jiao Tong University, China

    Chen Zhang received his Ph.D. from Shanghai Jiao Tong University (SJTU), Shanghai, China in March 2018. He was respectively with the Norwegian University of Science and Technology and the Technical University of Denmark in 2018 and 2020 as Postdoc. Since 2021, he is a tenure-track Associate Professor with the Department of Electrical Engineering of SJTU. His main research interest relates to the modelling, analysis and control of inverters-based systems including wind power and battery energy storage systems.


    Dr. Zhang have authored and co-authored more than 30 journal papers in the area of impedance analysis of grid-tied converters. Since 2021, he serves as Associate Editor for IEEE Transactions on Energy Conversion.


    Haoxiang Zong, Shanghai Jiao Tong University, China

    Haoxiang Zong received the B.Eng. degree from the Tianjin University, China, in 2017, and the Ph.D. degree from Shanghai Jiao Tong University, China in 2022. Currently, he is a postdoctoral researcher with the Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai, China. From 2019 to 2021, he has been a Ph.D. Visiting Scholar at the Department of Engineering Cybernetics, Norwegian University of Science and Technology, Trondheim, Norway. His current research interest is frequency-domain modeling and stability analysis of the power electronics dominated power system with wind farms, MMCs and BESS systems.





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