A Frequency Estimation Method Based on a Revised 3-Level Discrete Fourier Transform with an Estimation Delay Reduction Technique
Abstract
:1. Introduction
- The revised 3LDFT can improve harmonic and inter-harmonic suppression performance.
- The proposed frequency estimation method by adding four orthogonal components helps to suppress harmonics and inter-harmonics, which increases the frequency estimation accuracy. However, a potential weakness of the proposed method is the estimation delay error caused by three cycles and three samples.
- Therefore, as a final step, the estimation delay error would be decreased tremendously using the estimation delay reduction technique, compensating for the phase delay of the phasor.
2. The Proposed Frequency Estimation Technique
2.1. Sine-Filtered Signals
2.2. The Novel Frequency Estimation Method
2.3. The Estimation Delay Reduction Technique
2.4. A Flowchart of the Proposed Method
3. Performance Evaluation
3.1. Using Computer Generated Signals
3.1.1. Tests for Basic Signals
3.1.2. Tests for Harmonics and Inter-Harmonics
3.2. Using the PSCAD/EMTDC-Generated Signals
3.2.1. Dynamic Condition
3.2.2. The Single Line-to-Ground Fault
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Harmonics order | 1 | 3 | 5 | 7 | 9 |
Percentage | 100 | 20 | 20 | 10 | 10 |
Harmonics order | 1 | 3 | 3.4 | 4.4 | 5 | 7 | 9 |
Percentage | 100 | 20 | 10 | 10 | 20 | 10 | 10 |
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Kang, S.-H.; Seo, W.-S.; Nam, S.-R. A Frequency Estimation Method Based on a Revised 3-Level Discrete Fourier Transform with an Estimation Delay Reduction Technique. Energies 2020, 13, 2256. https://doi.org/10.3390/en13092256
Kang S-H, Seo W-S, Nam S-R. A Frequency Estimation Method Based on a Revised 3-Level Discrete Fourier Transform with an Estimation Delay Reduction Technique. Energies. 2020; 13(9):2256. https://doi.org/10.3390/en13092256
Chicago/Turabian StyleKang, Sang-Hee, Woo-Seok Seo, and Soon-Ryul Nam. 2020. "A Frequency Estimation Method Based on a Revised 3-Level Discrete Fourier Transform with an Estimation Delay Reduction Technique" Energies 13, no. 9: 2256. https://doi.org/10.3390/en13092256