Recursive SISO Impedance Modeling of Single-Phase Voltage Source Rectifiers

Abstract

published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User

Unified SISO Loop Gain Modeling, Measurement, and Stability Analysis of Three-Phase Voltage Source Converters

“…As reported in [20]- [26], [29]- [32], the neglect of FCE in the modeling would degrade the model accuracy. Moreover, due to the FCE, additional sideband loops are formed through the grid impedance, which strengthens the converter-grid coupling [26]. In summary, it is necessary to consider the FCE in the system modeling.…”

“…In this case, the complete admittance should be represented by an infinite-dimensional matrix conceptually [31], [32], which is rather complicated to analyze and implement. Thus, from the view of analysis and validation, finding the lowdimensional equivalent admittance model is appealing [26].…”

“…Unlike the first two methods, the HTF method directly linearizes the system around the time-periodic trajectories [4], [25]. Note that the information of the Toeplitz matrix is redundant in describing the FCEs, a general LTP modeling is further proposed in [26] that improves model compactness.…”

“…Overall, the SISO equivalent modeling technique for asymmetric ac grid analysis is still missing here. On the other hand, it was demonstrated in the single-phase system that there is low-order harmonic coupling between the converter and the power grid, and the coupling becomes stronger with the increase of the grid impedance [26]. However, the converter-grid coupling analysis in the three-phase VSC system is not well studied so far.…”

Frequency Coupling Suppression Control Strategy for Single-Phase Grid-Tied Inverters in Weak Grid

“…Recently, it has been reported that neglecting the coupling dynamics will inevitably lead to inaccurate model and stability analysis. Therefore, many studies have been devoted to analyzing the frequency coupling dynamics in single-phase systems [13], [20], [26]- [28]. From these works, it is obtained that the frequency couplings complicate not only the stability analysis but also the physical measurement.…”