Synchronization Capability and Frequency stability Improvement of PLL based GFLI using E-PIRC Connected to Weak and Distorted Grid

Barau Inuwa¹ , Ahamed Shehu Timta²

Section:Research Paper, Product Type: Journal-Paper
Vol.11 , Issue.3 , pp.27-34, Sep-2024

Online published on Sep 30, 2024

Copyright © Inuwa Barau Inuwa, Ahamed Shehu Timta . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Voltage source converter-based phase locked loop (PLL) grid following inverters (GFLI) are one of the technologies used in inverter-based resources (IBR) for integration of clean and renewable energy to an energized grid. However, PLL-based GFLI have drawback of synchronization instabilities when connected to an energized weak grid or a grid low short circuit ratio (SCR). The factor responsible for the synchronization difficulties which results to frequency instability is due to vector current control (VCC) loop interaction between the current controller PLL dynamics. The traditional PIRC (T-PIRC) harmonics compensation and disturbance rejection capability in the VCC deteriorates under weak grid, thus resulting in cascading effect on PLL dynamics. To improve the synchronization capability, a voltage feedforward control is proposed and enclosed within the T-PIRC, the enhanced PIRC (E-PIRC) is able to reject the disturbance under varying SCR conditions. Simulation results using MATLAB/Simulink shows the frequency stability and synchronization capability is improved under varying SCR conditions. Conclusively, the proposed method is robust in terms of grid weakness and its implementation does not require additional controller.

Key-Words / Index Term :
IBR, Weak grid, GFLI, PLL, T-PIRC, E-PIRC, voltage disturbance

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