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Energies 2019, 12(6), 1023; https://doi.org/10.3390/en12061023

Improved Frequency Locked Loop Based Synchronization Method for Three-Phase Grid-Connected Inverter under Unbalanced and Distorted Grid Conditions

Department of Electric Power, South China University of Technology, Guangzhou 510640, China
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Received: 15 February 2019 / Revised: 10 March 2019 / Accepted: 11 March 2019 / Published: 15 March 2019
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

To quickly and accurately estimate the parameters of the fundamental positive- and negative-sequence under the unbalanced and distorted grid voltage, a synchronization method is presented in this paper. The proposed method is based on both a harmonic decoupling network consisting of multiple dual second-order generalized integrators (MDSOGIs) and an improved frequency locked loop (IFLL), so it is called the MDSOGI-IFLL. Due to the IFLL, the system has the feature that the dynamic performance of estimating the fundamental frequency is independent of the variation of both the fundamental positive- and negative-sequence voltage. In this paper, a first-order linear frequency adaption model is established for the design of the IFLL. Finally, the good performance of the proposed MDSOGI-IFLL is validated by the simulation and experiment. View Full-Text
Keywords: frequency locked loop (FLL); synchronization method; unbalanced and distorted grid voltage; grid-connected inverter frequency locked loop (FLL); synchronization method; unbalanced and distorted grid voltage; grid-connected inverter
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Ma, W.; Ouyang, S.; Xu, W. Improved Frequency Locked Loop Based Synchronization Method for Three-Phase Grid-Connected Inverter under Unbalanced and Distorted Grid Conditions. Energies 2019, 12, 1023.

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