Multilevel direct power control - A generalized approach for grid-tied multilevel converter applications

Journal article (2014)

Authors

Sebastian Rivera Toronto Metropolitan University
Samir Kouro Universidad Técnica Federico Santa María
Bin Wu Toronto Metropolitan University
Salvador Alepuz Universitat Politecnica de Catalunya
Mariusz Malinowski Warsaw University of Technology
Patricio Cortes Universidad Técnica Federico Santa María
Jose Rodriguez Universidad Técnica Federico Santa María
Affiliation
External organisation
Grid connection Direct power control (DPC) Multilevel converters
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Published Date

2014-10

Language

English

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Abstract

This paper presents a generalized multilevel direct power control (ML-DPC) scheme for grid-connected multilevel power converters. The proposed method extends the original DPC operating principle by considering only the closest subset of two-level voltage vectors to the present switching state. The implementation of this principle requires the power derivatives for feedback, which can present numerical problems when applied experimentally, mainly due to high measurement noise sensitivity. Therefore, a derivative estimator is proposed based on the converter-grid model in the synchronous reference frame. In addition, a virtual flux observer is developed to achieve synchronization and improve robustness in the presence of grid voltage harmonics. The proposed method is applicable to any multilevel converter topology of any number of levels. In this paper, simulations and experimental results are presented for a seven-level cascaded H-bridge converter.