Voltage source converter in a microgrid

Bharat Chetry (), Adriano Carvalho () and Rui Brito ()
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Bharat Chetry: University of Porto
Adriano Carvalho: FEUP
Rui Brito: ISEP

International Journal of System Assurance Engineering and Management, 2018, vol. 9, issue 5, No 19, 1206-1216

Abstract: Abstract Microgird with higher amount of renewable energy sources interconnected with power electronic devices has many challenges, such as loss of inertia, low short circuit ratio, difficulty in power sharing, problem of storage in an islanded condition, which needs to be handled properly. Among other ones, the power sharing is one of the major problems in a microgrid that leads to the voltage and frequency limits violation and increased losses. This paper demonstrates that the voltage source converter (VSC) can extend its role of interfacing renewable sources to a new role of performing a high dynamic response as a generating unit of the microgrid. A Laplace model of the power converter is presented, which allows to analyze the converter behaviour in supporting the grid. The application of the converter to a weak microgrid is also presented to validate the proper behaviour of the power plant as a generation unit of the microgrid. The approach in controlling the converter operation is based on vector control implemented in a rotating reference frame handling the control variables in the dq domain. The VSC along with its controller is used in this paper to contribute the active and reactive power to stabilize the frequency and the voltage of the grid within the permissible limit.

Keywords: Microgrid; Reactive power; Renewable sources; Thevenin impedance; Voltage source converter (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1007/s13198-018-0741-x

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