New algorithm for grid synchronization based on Fourier series

Abstract-Dual active bridge (DAB) is a topology that is receiving more and more attention as a potential solution to interface dc grids of different voltage levels. From a system level, the implications of DABs on the stability of complex power systems are addressed in this work. Dynamics modeling and stability assessment for a DAB implementation aimed to interface low-voltage energy resources with a medium-voltage dc (MVDC) collection and distribution grid are presented. The DAB admittance is analytically derived and assessed in order to describe its dynamics and anticipate its behavior when integrated in a complex MVDC grid. The model considers the low frequency range, mostly dominated by the controller action, and the high frequency range, described by a non-linear operation. The theoretical analysis is verified by hardware-in-the-loop emulation, with the controller running on a digital signal processor. The proposed implementation is proved to achieve passivity in the whole spectrum, which undoubtedly is a desired feature for a massive power electronics integration in the future MVDC grids.

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“…b) Response to a negative command step (from rated to half power). time by recursive Fourier transform (RFT) [45], which is depicted in Fig. 10.…”

Section: Passivity Compliancementioning

confidence: 99%

Stable and Passive High-Power Dual Active Bridge Converters Interfacing MVDC Grids

Freijedo

Rodriguez-Diaz

Dujić

2018

IEEE Trans. Ind. Electron.

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“…In [14], [15] it is proposed a method for fundamental component identification based on MAFs, which is shown in Fig. 1.…”

Section: B Equivalence To Srf Schemes Based On Mafsmentioning

confidence: 99%

“…In this paper, it is analytically demonstrated that the method based on Synchronous Reference Frame (SRF) and Moving Average Filters (MAFs) of [14], [15], for which the transient lasts half a cycle, actually implements the DCT in a recursive manner. However, when considering fixed point implementations, FIR digital filters based on DCT have some advantages with respect to SRF-IIR based structures: recursive schemes feature a larger quantization error due to the finite word length [13], [16].…”

Section: Introductionmentioning

confidence: 99%

Harmonic detection methods for active power filters based on discrete cosine transform and dithering

Yepes

Freijedo

Doval-Gandoy

et al. 2009

2009 35th Annual Conference of IEEE Industrial Electronics

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Harmonic detection is a very important factor in control of active power filters, since it generates the reference signal for the current controller. The performance of the whole system will be affected by the suitability of the implemented harmonic identification method. In this work, the equivalences and advantages of the discrete cosine transform with respect to other Fourier based algorithms are demonstrated. It is proved in this paper that both the transient length and the phase error in presence of grid frequency deviations are halved in comparison to DFT. Therefore, it is convenient to provide a frequency adaptation feature to the discrete cosine transform. In this work it is proposed to adjust the window width to the grid fundamental frequency, and to enhance the frequency resolution by means of dithering. The theoretical approach is verified by experimental results in an APF lab prototype.

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“…Recently, the authors in [6] applied the digital approach of a moving average comb filter (MVA) in processing the PCC voltage measurements to obtain the fundamental PSCs, which will be used to compute the phase angle directly. (7) and (8) Besides having the capability of synchronising individual PCC phase voltages, this scheme works well when they become distorted, unbalanced and are no longer 120 o degrees from each other, as shown in Figure 7.…”

Section: Fourier Series + Moving Average (Fs + Ma)mentioning

confidence: 99%

“…All these have been well-studied by either the researchers who introduced the schemes or those who have worked on these schemes for their applications [3,[5][6][7]. In this paper, a coherent investigation is performed for these schemes and this leads to a comparative study which has been done according to the aforementioned criteria using both MATLAB-SIMULINK simulation results and practical on-line tests.…”

Section: Introductionmentioning

confidence: 99%

Voltage Synchronisation Techniques for Grid-Connected Power Converters

Chong

Lee

Zhang

2014

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)

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Standard synchronisation scheme for grid-connected power converters has been known to fail to correctly estimate the instantaneous phase angle of the grid voltages which are unbalanced and corrupted with harmonics. There are other advanced schemes which have been proposed to address this issue but a thorough comparison among the schemes is lacking. This paper presents a detailed review on five advanced grid voltage synchronisation schemes. A coherent investigation is performed to compare their merits and limitations considering a wide range of voltage distortions. This is verified through simulation and practical results.

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New algorithm for grid synchronization based on Fourier series

Cited by 14 publications

References 6 publications

Stable and Passive High-Power Dual Active Bridge Converters Interfacing MVDC Grids

Stable and Passive High-Power Dual Active Bridge Converters Interfacing MVDC Grids

Harmonic detection methods for active power filters based on discrete cosine transform and dithering

Voltage Synchronisation Techniques for Grid-Connected Power Converters

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