Comparison of zero-sequence injection methods in cascaded H-bridge multilevel converters for large-scale photovoltaic integration

Title: Comparison of zero-sequence injection methods in cascaded H-bridge multilevel converters for large-scale photovoltaic integration
Creator: Yu, Yifan; Konstantinou, Georgios; Townsend, Christopher D.; Agelidis, Vassilios G.
Relation: IET Renewable Power Generation Vol. 11, Issue 5, p. 603-613
Publisher Link: http://dx.doi.org/10.1049/iet-rpg.2016.0621
Publisher: The Institution of Engineering and Technology (IET)
Resource Type: journal article
Date: 2017
Description: Photovoltaic (PV) power generation levels in the three phases of a multilevel cascaded H-bridge (CHB) converter can be significantly unbalanced, owing to different irradiance levels and ambient temperatures over a large-scale solar PV power plant. Injection of a zero-sequence voltage is required to maintain three-phase balanced grid currents with unbalanced power generation. This study theoretically compares power balance capabilities of various zero-sequence injection methods based on two metrics which can be easily generalised for all CHB applications to PV systems. Experimental results based on a 430 V, 10 kW, three-phase, seven-level cascaded H-bridge converter prototype confirm superior performance of the optimal zero-sequence injection technique.
Subject: bridge circuits; power convertors; power grids; solar power stations
Identifier: http://hdl.handle.net/1959.13/1396039
Identifier: uon:33981
Identifier: ISSN:1752-1416
Language: eng
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