Sequence Impedance Characteristics of Grid-Forming Converter Controls

verfasst von

Marc Dokus, Axel Mertens

Abstract

In this paper, the sequence impedance-based small-signal modelling is exemplarily applied to the synchronverter control approach with three different inner control setups and compared against other popular grid-forming concepts, namely droop control and the virtual synchronous generator (VSG). The synchronverter variations differ in terms of whether an inner dual loop voltage control (DLVC), a single loop voltage control (SLVC) or an open loop voltage control (OLVC) concept is utilised. These models are derived in a common sequence impedance framework which is a suitable approach to analyse the robustness of different converter controls in a generalised form. First, impedance models are derived, which do not only reveal the existence of a mirrored frequency as an image of the disturbance frequency shifted by two times the fundamental frequency, but also predict the effect of the different grid-forming control variations on the system stability. These models are evaluated against other control methods and validated by time-domain simulations and experimental results. The applicability of the models is confirmed by a close correlation between sequence impedance model, time-domain simulations, experimental results as well as based on a case study.

Organisationseinheit(en)

Institut für Antriebssysteme und Leistungselektronik

Typ

Aufsatz in Konferenzband

Seiten

413-420

Anzahl der Seiten

8

Publikationsdatum

2020

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Energieanlagenbau und Kraftwerkstechnik, Erneuerbare Energien, Nachhaltigkeit und Umwelt, Elektrotechnik und Elektronik, Steuerung und Optimierung

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1109/PEDG48541.2020.9244356 (Zugang: Geschlossen)