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Author:Fuad, Khaled
Title:Grid-voltage Synchronization Algorithms Based on Phase-locked Loop and Frequency-locked Loop for Power Converters
Publication type:Master's thesis
Publication year:2014
Pages:x + 45      Language:   eng
Department/School:Sähkötekniikan korkeakoulu
Main subject:Electrical Drives   (S3016)
Supervisor:Hinkkanen, Marko
Instructor:
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201406272262
OEVS:
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Location:P1 Ark Aalto  1603   | Archive
Keywords:decoupling network
frequency-locked loop
grid-connected converter
phase-locked loop
second order generalized integrator.
Abstract (eng):The purpose of this thesis is to study and find the appropriate grid-voltage synchronization method for grid-connected converters under different kinds of faults like phase unbalancing, harmonics, offset and voltage sags.
The main purpose of grid-synchronization algorithms is to estimate the positive- and negative-sequence components of the utility voltage under unbalanced and distorted condition.
The existing most advanced phase-locked loop (PLL) and frequency-locked loop (FLL) methods are well known method for grid-synchronization.
The fundamental variable estimated by the PLL is the grid-phase angle, whereas the grid frequency is the one for the FLL.
The most extended technique used for grid synchronization in three-phase three wire system is a synchronous reference frame PLL (SRF-PLL).
The SRF-PLL works accurately during balanced condition, but cannot estimate voltage components during unbalanced condition.
The Decoupled Double Synchronous Reference Frame PLL (DDSRF-PLL) is might be a substantiation solution for the estimation of the sequence components of the utility voltage under unbalanced condition.
Another method based on the FLL, a double second-order generalized integrator FLL (DSOGI-FLL) has also the ability to detect the positive- and negative-sequence components of the utility voltage under unbalanced condition.
DDSRF-PLL and DSOGI-FLL algorithms are tested under different kinds of faults and compared with each other.
The results show that their performance under harmonic-distorted condition is not really acceptable.
A new algorithm based on SRF-PLL, decoupled multiple synchronous reference frame PLL (DMSRF-PLL) might be a better solution for accurate detection of the positive- and negative-sequence voltage components under unbalanced and harmonic distortion condition.
ED:2014-08-03
INSSI record number: 49398
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