Grid-forming control for power converters based on matching of synchronous machines
(2018) In Automatica 95. p.273-282- Abstract
We consider the problem of grid-forming control of power converters in low-inertia power systems. Starting from an average-switch three-phase power converter model, we draw parallels to a synchronous machine (SM) model and propose a novel converter control strategy which dwells upon the main characteristic of a SM: the presence of an internal rotating magnetic field. In particular, we augment the converter system with a virtual oscillator whose frequency is driven by the DC-side voltage measurement and which sets the converter pulse-width-modulation signal, thereby achieving exact matching between the converter in closed-loop and the SM dynamics. We then provide a sufficient condition asserting existence, uniqueness, and global... (More)
We consider the problem of grid-forming control of power converters in low-inertia power systems. Starting from an average-switch three-phase power converter model, we draw parallels to a synchronous machine (SM) model and propose a novel converter control strategy which dwells upon the main characteristic of a SM: the presence of an internal rotating magnetic field. In particular, we augment the converter system with a virtual oscillator whose frequency is driven by the DC-side voltage measurement and which sets the converter pulse-width-modulation signal, thereby achieving exact matching between the converter in closed-loop and the SM dynamics. We then provide a sufficient condition asserting existence, uniqueness, and global asymptotic stability of a shifted equilibrium, all in a rotating coordinate frame attached to the virtual oscillator angle. By actuating the DC-side input of the converter we are able to enforce this condition and provide additional inertia and damping. In this framework, we illustrate strict incremental passivity, droop, and power-sharing properties which are compatible with conventional power system operation requirements. We subsequently adopt disturbance-decoupling and droop techniques to design additional control loops that regulate the DC-side voltage, as well as AC-side frequency and amplitude, while in the end evaluating them with numerical experiments.
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- author
- Arghir, Catalin ; Jouini, Taouba LU and Dörfler, Florian
- publishing date
- 2018-09-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Automatica
- volume
- 95
- pages
- 10 pages
- publisher
- Pergamon Press Ltd.
- external identifiers
-
- scopus:85047901736
- ISSN
- 0005-1098
- DOI
- 10.1016/j.automatica.2018.05.037
- language
- English
- LU publication?
- no
- id
- 8232d426-e91e-4240-afcd-be9a5f7ef9eb
- date added to LUP
- 2019-08-02 13:49:26
- date last changed
- 2022-04-26 03:31:22
@article{8232d426-e91e-4240-afcd-be9a5f7ef9eb,
abstract = {{<p>We consider the problem of grid-forming control of power converters in low-inertia power systems. Starting from an average-switch three-phase power converter model, we draw parallels to a synchronous machine (SM) model and propose a novel converter control strategy which dwells upon the main characteristic of a SM: the presence of an internal rotating magnetic field. In particular, we augment the converter system with a virtual oscillator whose frequency is driven by the DC-side voltage measurement and which sets the converter pulse-width-modulation signal, thereby achieving exact matching between the converter in closed-loop and the SM dynamics. We then provide a sufficient condition asserting existence, uniqueness, and global asymptotic stability of a shifted equilibrium, all in a rotating coordinate frame attached to the virtual oscillator angle. By actuating the DC-side input of the converter we are able to enforce this condition and provide additional inertia and damping. In this framework, we illustrate strict incremental passivity, droop, and power-sharing properties which are compatible with conventional power system operation requirements. We subsequently adopt disturbance-decoupling and droop techniques to design additional control loops that regulate the DC-side voltage, as well as AC-side frequency and amplitude, while in the end evaluating them with numerical experiments.</p>}},
author = {{Arghir, Catalin and Jouini, Taouba and Dörfler, Florian}},
issn = {{0005-1098}},
language = {{eng}},
month = {{09}},
pages = {{273--282}},
publisher = {{Pergamon Press Ltd.}},
series = {{Automatica}},
title = {{Grid-forming control for power converters based on matching of synchronous machines}},
url = {{http://dx.doi.org/10.1016/j.automatica.2018.05.037}},
doi = {{10.1016/j.automatica.2018.05.037}},
volume = {{95}},
year = {{2018}},
}