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Energies 2017, 10(7), 935; doi:10.3390/en10070935

Internal Balance during Low-Voltage-Ride-Through of the Modular Multilevel Converter STATCOM

1
Department of Energy Technology, Aalborg University, 9220 Aalborg East, Denmark
2
Department of Electrical Sustainable Energy, Delft University of Technology, 2628 CD Delft, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 9 May 2017 / Revised: 20 June 2017 / Accepted: 3 July 2017 / Published: 5 July 2017

Abstract

Grid faults are common in power systems and can have a severe impact on the operation of the converters in the system. In this paper, the operation of a Modular Multilevel Converter (MMC)-based Static Synchronous Compensators (STATCOM) is investigated during grid faults. The study focuses on the challenging internal control of the converter to allow the independent control of the energy levels of each arm, with the goal to maintain internal balancing of the MMC during contingencies. Extensive experimental results highlight the need for a sophisticated internal control. Moreover, the experimental analysis verifies that, by using the proposed control structure, the MMC can effectively ride through a fault on the AC side without tripping, while injecting the necessary positive and negative sequence reactive current levels according to the most recent grid codes. View Full-Text
Keywords: arm energy balance; circulating current controller; grid asymmetries; low-voltage ride-through; modular multilevel converter; STATCOM arm energy balance; circulating current controller; grid asymmetries; low-voltage ride-through; modular multilevel converter; STATCOM
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tsolaridis, G.; Kontos, E.; Chaudhary, S.K.; Bauer, P.; Teodorescu, R. Internal Balance during Low-Voltage-Ride-Through of the Modular Multilevel Converter STATCOM. Energies 2017, 10, 935.

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