Robust and Improvised Enhanced Phase Lock Loop Structure for its Application with Electric Spring

International Journal of Electrical and Electronics Engineering

© 2024 by SSRG - IJEEE Journal

Volume 11 Issue 7

Year of Publication : 2024

Authors : Mehul Dansinh Solanki, Satish K. Joshi

10.14445/23488379/IJEEE-V11I7P127

How to Cite?

Mehul Dansinh Solanki, Satish K. Joshi, "Robust and Improvised Enhanced Phase Lock Loop Structure for its Application with Electric Spring," SSRG International Journal of Electrical and Electronics Engineering, vol. 11,  no. 7, pp. 302-311, 2024. Crossref, https://doi.org/10.14445/23488379/IJEEE-V11I7P127

Abstract:

Phase-Locked Loops (PLL) are an integral part of grid-tied Power Frequency Applications (PFA) and play a crucial role in their proper operation and control. This work proposes an update in the available Enhanced Phase Lock Loop structure (E-PLL) by introducing an adaptive integral gain, which adapts a value depending on the error that it processes to give it more robustness. The basic function of PLLs for PFA is to synchronize the apparatus with the grid’s phase, and additionally, it may function as an orthogonal function generator, may deduce phase angle, and may give out harmonic free pure sinusoidal signal perfectly in tandem with the input. An Electrical Spring (ES) is a grid connected Voltage Source Inverter (VSI) acting in tandem with the noncritical load of a consumer and provides voltage regulation to critical loads. Synchronization of the converter (ES) with the grid parameter is a must, and hence a PLL, for the grid connected inverters. Further, ES is required to function amidst dynamically challenging conditions, viz., sag, swell, transients, under voltages, unbalance, and in the presence of harmonics. PLL is crucial to ES’s proper functioning and must stand robust against the mentioned odds and provide synchronization with the greatest possible speed and accuracy. To demonstrate the might of the proposed Improvised Enhanced PLL structure (IEPLL) as an ancillary component of ES, its performance has been compared with that of another robust PLL structure employing a Second Order Generalized Integrator (SOGI).

Keywords:

Electric spring, PLL, Synchronous reference frame, Second order generalized integrator, Voltage regulation.

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