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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: | Electronic archive copy is available via Aalto Thesis Database.
Instructions Reading digital theses in the closed network of the Aalto University Harald Herlin Learning CentreIn the closed network of Learning Centre you can read digital and digitized theses not available in the open network. The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/ You can read theses on the Learning Centre customer computers, which are available on all floors.
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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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