Journal of Modern Power Systems and Clean Energy

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Home > Archive>Volume 12, Issue 2, 2024 >561-570. DOI:10.35833/MPCE.2022.000773
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Torque Limit-based Inertial Control Method Based on Delayed Support for Primary Frequency Control of Wind Turbines
Author:
Affiliation:

1.the School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China;2.the State Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 211103, China

Fund Project:

This work was supported by the National Natural Science Foundation of China (No. 51977111), the “Six Talent Peaks” High-level Talent Project in Jiangsu Province (No. XNY-025), the Special Fund of Jiangsu Province for Transformation of Scientific and Technological Achievements (No. BA2019045), and the Jiangsu Qinglan Project.

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    Abstract:

    To avoid the secondary frequency dip caused by the steep drop of the electrical power of wind turbines (WTs) at the end of frequency support stage, the torque limit-based inertial control (TLIC) method sets the power reference as a linear function of rotor speed, rather than the step form for the stepwise inertial control. However, the compensation effect on the frequency nadir (FN) caused by the load surge is weakened as the TLIC power is no longer in the step form. Specifically, the maximum point of the frequency response component (FRC) contributed by TLIC occurs earlier than the minimum point of FRC corresponding to the load surge, so that the FN cannot be adequately raised. Therefore, this paper first investigates the relation between the peak and nadir times of FRCs stimulated by the TLIC and load power. On this basis, with the compensation principle of matching the peak and nadir times of FRCs, the improved TLIC method based on delayed support is proposed. Finally, the effectiveness of the proposed method is validated via the experiments on the test bench of wind-integrated power system.

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History
  • Received:November 25,2022
  • Revised:February 24,2023
  • Online: March 27,2024

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