Abstract
This chapter deals with the basic enhanced phase-locked loop (EPLL) structure. The EPLL enhances the standard PLL by removing its main drawback, which is the presence of double-frequency errors. EPLL achieves this task by means of estimating the amplitude of the input signal and using it within a new loop to remove the error. The EPLL provides an estimate of the input signal magnitude and also provides a filtered version of the input signal. It serves as a core and a building block for numerous developments. The chapter focuses on the derivation, principles of operation, linear model, and design guidelines pertaining to the EPLL. The droop control method (DCM) is widely used to control the operation of synchronous generators (SGs) in a power system. Three scenarios are considered to study the dynamic performance of the EPLL: the step jumps in the input signal variables, amplitude modulations, and phase-angle modulations.
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