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This paper proposes a phase-locked loop (PLL) structure, which is composed of non-autonomous adaptive filters (AFs) and a positive sequence detector (PSD), both operating in conjunction with the PLL based on synchronous reference frame (SRF-PLL). The AFs are used to extract the fundamental components of the utility voltages, whereas the PSD extracts the positive sequence components at fundamental...
The energy transfer between Power Electronic Converters (PEC) and grid is improved by proper design of synchronization techniques. Phase Lock Loop (PLL) is used to estimate the grid phase angle. The challenges associated with the design of PLL are how fast the phase angle and frequency are estimated and synchronized under ideal as well as non-ideal grid conditions. Synchronous Reference Frame (SRF)...
This paper proposes an advanced controller suitable for three-phase phase-locked loops (PLLs), which are employed in grid-connected power converters. This controller is formed of one or more lead compensators cascaded to the main proportional integral regulator. The proposed lead compensators are second order with pure imaginary roots: they have both a notch peak and a resonant peak (the notch frequency...
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