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Volume 9 Issue 11
Nov.  2022

IEEE/CAA Journal of Automatica Sinica

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Z. W. Deng and C. Xu, “Frequency regulation of power systems with a wind farm by sliding-mode-based design,” IEEE/CAA J. Autom. Sinica, vol. 9, no. 11, pp. 1980–1989, Nov. 2022. doi: 10.1109/JAS.2022.105407
Citation: Z. W. Deng and C. Xu, “Frequency regulation of power systems with a wind farm by sliding-mode-based design,” IEEE/CAA J. Autom. Sinica, vol. 9, no. 11, pp. 1980–1989, Nov. 2022. doi: 10.1109/JAS.2022.105407

Frequency Regulation of Power Systems With a Wind Farm by Sliding-Mode-Based Design

doi: 10.1109/JAS.2022.105407
Funds:  This work was supported by Ministry of Science and Technology of Peoples Republic of China (2019YFE0104800) and the Joint Funds of the National Natural Science Foundation of China (U1865101)
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  • Load frequency regulation is an essential auxiliary service used in dealing with the challenge of frequency stability in power systems that utilize an increasing proportion of wind power. We investigate a load frequency control method for multi-area interconnected power systems integrated with wind farms, aimed to eliminate the frequency deviation in each area and the tie-line power deviation between different areas. The method explores the derivative and integral terminal sliding mode control technology to solve the problem of load frequency regulation. Such technology employs the concept of relative degrees. However, the subsystems of wind-integrated interconnected power systems have different relative degrees, complicating the control design. This study develops the derivative and integral terminal sliding-mode-based controllers for these subsystems, realizing the load frequency regulation. Meanwhile, closed-loop stability is guaranteed with the theory of Lyapunov stability. Moreover, both a thermal power system and a wind power system are applied to provide frequency support in this study. Considering both constant and variable external disturbances, several numerical simulations were carried out in a two-area thermal power system with a wind farm. The results demonstrate the validity and feasibility of the developed method.

     

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    Highlights

    • A load frequency control (LFC) method based on the derivative and integral terminal sliding mode technology is investigated for multi-area interconnected power systems integrated with wind power. This method guarantees the system with finite-time convergence and avoids the singularity problem during the control design process
    • Considering the flexibility of wind power regulation, wind generators are also applied to provide frequency support by adopting a wind power system model based on the mechanical dynamics of variable speed wind turbines (VSWTs)
    • Numerical simulations are carried out, which indicated that the proposed LFC method has the advantages of fast convergence and small oscillation. Moreover, effective frequency regulation and strong robustness are achieved under external disturbances

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