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Analysis and Enhancement Method for Transient Synchronization Stability of Phase-locked Loop Considering Damping and Angular Velocity
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Affiliation:

College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Abstract:

The increasing penetration of power electronic devices in power grids has led to a decrease in grid strength and inertia, the transient synchronization stability problem under grid faults is becoming more and more prominent. To address the transient loss problem of grid-connected inverters during weak grid faults, a transient synchronization model for grid-connected inverters is developed considering the phase-locked loop damping and the initial angular velocity at the moment of fault occurrence. The impact of variations in phase-locked loop damping and initial angular velocity on transient synchronization stability is analyzed. Furthermore, an additional damping control method of phase-locked loop based on the feedback correction of frequency deviation is proposed to enhance the transient synchronization stability of grid-connected inverters. To address the transient loss problem posed by serious grid faults without stable equilibrium points, a dynamic compensation method for output angular velocity of phase-locked loop is proposed to achieve the stable operation of the system after fault recovery. Finally, a hardware-in-the-loop experimental platform is constructed to verify the theoretical analysis and control methods.

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Foundation:

This work is supported by National Natural Science Foundation of China (No. 52325702).

Get Citation
[1]ZHAN Ling, HU Bin, WANG Yaoxin, et al. Analysis and Enhancement Method for Transient Synchronization Stability of Phase-locked Loop Considering Damping and Angular Velocity[J/OL]. Automation of Electric Power Systems, http://doi. org/10.7500/AEPS20230717007.
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History
  • Received:July 17,2023
  • Revised:January 26,2024
  • Adopted:November 20,2023
  • Online: February 07,2024
  • Published: