Journal of Modern Power Systems and Clean Energy

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Home > Archive>Volume 9, Issue 2, 2021 >347-355. DOI:10.35833/MPCE.2019.000341
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Decoupling Scheme for Virtual Synchronous Generator Controlled Wind Farms Participating in Inertial Response
Author:
Affiliation:

1.Department of Automation, Tsinghua University, Beijing, China;2.State Grid Economic and Technological Research Institute Co. Ltd., Beijing, China

Fund Project:

This work was supported by Science and Technology Project of State Grid Corporation of China (No. 5102-201956300A-0-0-00).

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    Abstract:

    In this paper, the dynamic coupling between the wind turbine rotor speed recovery (WTRSR) and inertial response of the conventional virtual synchronous generator (VSG) controlled wind farms (WFs) is analyzed. Three distinguishing features are revealed. Firstly, the inertial response characteristics of VSG controlled WFs (VSG-WFs) are impaired by the dynamic coupling. Secondly, when the influence of WTRSR is dominant, the inertial response characteristics of VSG-WFs are even worse than the condition under which WFs do not participate in the response of grid frequency. Thirdly, this phenomenon cannot be eliminated by only enlarging the inertia parameter of VSG-WFs, because the influence of WTRSR would also increase with the enhancement of inertial response. A decoupling scheme to eliminate the negative influence is then proposed in this paper. By starting the WTRSR process after inertial response period, the dynamic coupling is eliminated and the inertial response characteristics of WFs are improved. Finally, the effectiveness of the analysis and the proposed scheme are verified by simulation results.

    图1 Typical processes of frequency response.Fig.1
    图2 Equivalent model of power grid with WFs.Fig.2
    图3 Rotation speed characteristics of WT.Fig.3
    图4 Operation curves under different conditions. (a) Frequency response curves. (b) Output active power. (c) RoCoF curves. (d) Grid frequency comparison of different Hvsg.Fig.4
    图5 Virtual rotor frequency of VSG under different conditions.Fig.5
    图6 Proposed scheme for VSG applied in WFs.Fig.6
    图7 APRC of proposed scheme when grid frequency decreases.Fig.7
    图8 Flowchart of proposed scheme.Fig.8
    图9 APRC of proposed scheme when grid frequency increases.Fig.9
    图10 Operation stage signals of proposed scheme. (a) During frequency response. (b) During MPPT operation.Fig.10
    图11 Results for factors considered in frequency response. (a) Grid frequency response. (b) RoCoF curves.Fig.11
    图12 WT operation curves under different conditions. (a) Output active power. (b) WT rotor speed curves.Fig.12
    图13 Frequency nadir improvement of proposed scheme under different wind speeds.Fig.13
    图14 WT operation curves in this case. (a) Output active power. (b) Grid frequency response. (c) WT rotor speed.Fig.14
    图15 Simulation model of IEEE 4-machine 2-area system.Fig.15
    图16 Simulation results in IEEE 4-machine 2-area system. (a) Frequency drop event occurs. (b) Frequency increase event occurs.Fig.16
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History
  • Received:May 20,2019
  • Online: March 22,2021

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