Resilient Synchronization of Grid Converters at Low Sampling Frequencies
| Autor: | Vladimir Blasko, Vlatko Miskovic, Michael C. Harke, Thomas M. Jahns |
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| Rok vydání: | 2020 |
| Předmět: |
Computer science
020208 electrical & electronic engineering 05 social sciences 02 engineering and technology Grid synchronization Converters Grid Phase-locked loop Control theory Harmonics 0202 electrical engineering electronic engineering information engineering 0501 psychology and cognitive sciences Performance improvement 050107 human factors Decoupling (electronics) |
| Zdroj: | 2020 IEEE Applied Power Electronics Conference and Exposition (APEC). |
| Popis: | The phase-locked loop (PLL) is a critical component for synchronization of power converters to the grid. To improve positive sequence detection during nonideal operating conditions including grid faults, high-voltage unbalance, high-frequency harmonics, and DC offsets, the introduction of harmonic decoupling networks (DN) as PLL pre-filters has been proposed in the literature. These DNs exhibit satisfactory performance at high sampling frequencies (i.e., 10 kHz and above). In some applications such as medium-voltage converters, low sampling/control frequency is necessary, and available harmonic decoupling solutions do not perform satisfactorily. Delay-compensated decoupling networks (DCDN) are proposed in this paper, which, in combination with a linear PLL (L-PLL), exhibit excellent performance improvement at low sampling frequencies. Both simulation and experimental results are presented to verify the effectiveness of the proposed DCDN combined with an L-PLL. |
| Databáze: | OpenAIRE |
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