Usually the filter current of an active filter (VSI‐type) is controlled by a two‐step controller and the disturbance (load current) is added to the control circuit. This method becomes unstable, if capacitive loads have to be compensated. It is shown in this paper, that the algorithm can be stabilized by additional filter capacitors. So the control circuit remains stable also at the compensation of capacitive loads.
Abstract-This paper recapitulates an analytic control model for arbitrary island grids and presents findings on the dynamic behaviour of purely inverter driven island grids. Pole zero plots of different grid structures are presented and the influence of several inverter parameters on the grid stability is analysed. Findings show that for improved grid stability the inverter's time constants should also relate to their rated power. Further it is shown how P-Q rotation in the droop control can improve the integration density of renewable power sources in the distribution grid.
Zusammenfassung Der Beitrag beschreibt die Entwicklung eines regelungstechnischen Modells wechselrichtergeführter Inselnetze. Der hier vorgestellte strukturierte Ansatz bildet auf Basis der Zustandsraumdarstellung eines Wechselrichters ein multi-Wechselrichtermodell und verknüpft dieses mit der Strukturinformation der Knoteninzidenzmatrix zu einem geschlossenen Inselnetzmodell. Das Verfahren ermöglicht die Erstellung von Modellen mit beliebig strukturierten Netzen und großer Anzahl unterschiedlicher Wechselrichtermodelle im NSNetz. Abschließend wird eine Stabilitätsanalyse eines Beispielnetzes präsentiert.Summary This paper presents the development of a control model for inverter driven island grids. The herein presented structured approach creates a multi voltage source inverter model from a single inverter state space model and combines this with the node incidence matrix of a network into a compound model of an island grid. The presented approach allows to analyse arbitrary grid structures and different inverter models and it incorporates a large number of inverters. The model can be particularly used for ohmic-inductive low voltage lines. At the end of the article, a stability analysis of a sample network is presented.
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