Journal
2022 20TH INTERNATIONAL CONFERENCE ON MECHATRONICS - MECHATRONIKA (ME)
Volume -, Issue -, Pages -Publisher
IEEE
DOI: 10.1109/ME54704.2022.9983301
Keywords
SOGI; frequency selectivity; frequency response analysis; symmetrical components
Funding
- Ministry of Education, Youth and Sports of the Czech Republic under the project OP VVV Electrical Engineer-ing Technologies with High-Level of Embedded Intelligence [CZ.02.1.01/0.0/0.0/18_069/0009855, SGS-2021-021]
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The Fortescue theorem is a valuable technique for transforming three-phase systems into symmetrical components, but it is not suitable for real-time systems. This paper proposes a solution by combining the Fortescue theorem with a second-order generalized integrator (SOGI). The proposed algorithm can identify voltage vectors and process systems with multiple harmonics.
The Fortescue theorem is a well-known transformation technique for parameter identification in three-phase systems. It is a valuable tool that transforms an unbalanced system into symmetrical components. This method itself can not be used in a real-time system because it needs to identify individual vectors of the voltage. The solution proposed in this paper is to combine the Fortescue theorem with a second-order generalized integrator (SOGI). The SOGI algorithm provides two functions. Firstly, it identifies voltage vectors. Secondly, it works as a band-pass filter. This means it can deal with the systems containing multiple harmonics, processing them individually. This paper evaluates the performance of the proposed algorithm, with a focus on harmonic selectivity and speed of the reaction during transients.
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