Abstract
The grid voltage information such as the phase-angle, the frequency, and the amplitude is crucial for the design of synchronization and control of power converters in the micro-grid. The conventional approach to estimate the grid voltage information is accomplished by phase-locked loop (PLL) techniques. Among various existing PLL techniques, filter-based PLLs can provide more accurate estimations even under adverse grid conditions. In this paper, a new single-phase filtering technique based on multiple delayed signal cancellation (MDSC) is proposed for extracting both in-phase and quadrature components of the selected harmonic order of the single-phase grid voltage signal. This MDSC technique can be realized in both the direct-form and the recursive-form. In comparison with existing single-phase cascaded delayed signal cancellation (CDSC) techniques, this MDSC technique utilizes less memory for the extraction of grid voltage fundamental frequency component. The proposed MDSC filter can be applied as a pre-filter to the enhanced PLL (EPLL) for the prompt and accurate estimations of the grid voltage information under adverse grid conditions. Both frequency adaptive and non-adaptive MDSC-based EPLL schemes are proposed in this paper. To validate the effectiveness of the proposed methods, experiments are conducted on the MDSC-based EPLLs and compared with the CDSC-EPLL under various grid voltage disturbances.
Original language | English |
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Article number | 8709717 |
Pages (from-to) | 7122-7133 |
Number of pages | 12 |
Journal | IEEE Transactions on Industry Applications |
Volume | 55 |
Issue number | 6 |
DOIs | |
State | Published - 01 11 2019 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 1972-2012 IEEE.
Keywords
- Delayed signal cancellation (DSC)
- enhanced phase-locked loop (EPLL)
- grid synchronization
- harmonics
- micro-grid