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Phase-looked Loop (PLL) is a critical component for the control and grid synchronization of grid-connected power converters. This paper presents a benchmarking study on the small-signal dynamics of three commonly used PLLs for single-phase converters, including enhanced PLL, second-order generalized integrator based PLL, and the inverse-PLL. First, a unified small-signal model of those PLLs is established...
A relative-error identification method for stable minimum phase systems is introduced. Using this identification method, the L∞-norm of the relative-error between the original system and the identified system can be bounded a priori. Extensions to the case of non-minimum phase systems are discussed.
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