Study on Experimental System for Three Level Neutral-Point-Clamped Converter

Abstract:

This paper focuses on the digital experimental system for neutral-point-clamped three-level converter. First, SVM’s digital implementation method is studied. As neutral-point voltage unbalance is an inherent problem for this topology, a practical capacitor voltage balance method is present. This method uses a variable factor as the small vectors’ adjustment coefficient, which is calculated by PI controller with capacitor voltage deviation. Then, a digital modular control system is proposed, in which both hardware and software system structures are designed in modular. The digital control system adopts high speed optical-fiber communication between a master controller and multiple sub-controllers, and realized the effective and rapid control of the experimental prototype finally.

• Periodical: Advanced Materials Research (Volumes 986-987)
• Pages: 1858-1863
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.986-987.1858
• Online since: July 2014
• Authors: Gang Han*, Jian Wen Zhang, Xu Cai
• Keywords: Digital Modular Control, Neutral-Point Potential (NP), Optical-Fiber Communication, Three Level Converter

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