Improved Dead-Beat Predictive DPC Strategy of Grid-Connected DC-AC Converters With Switching Loss Minimization and Delay Compensations

• Published in: IEEE transactions on industrial informatics Vol. 9; no. 2; pp. 728 - 738
• Main Author: Hu, Jiabing
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.05.2013; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Compensation; Converters; DC-AC converter; dead-beat; delay compensation; direct power control (DPC); Electric potential; Mathematical analysis; predictive; Reactive power; Strategy; Studies; Switches; Switching; Switching frequency; Switching loss; vector sequence; Vectors; Vectors (mathematics); Voltage; Voltage control
• ISSN: 1551-3203; 1941-0050
• DOI: 10.1109/TII.2012.2223705

This paper presents an improved dead-beat predictive direct power control (DPC) strategy for grid-connected dc-ac converters. In order to minimize switching losses and to alleviate power oscillations, a new voltage vectors' sequence is proposed for the predictive DPC strategy based on the angular location of the required converter voltage vector rather than the grid voltage vector. Thus, low-order harmonics in ac currents and periodic oscillations in the reactive power are removed with the feature of minimum switching losses kept. Further, in order to reduce steady-state errors of active and reactive powers, compensation methods are proposed in practical systems for both power errors and angular shifts caused by sampling delays. Experimental results on a 1.5 kW grid-connected dc-ac converter are provided to validate the feasibility of the proposed voltage vectors' sequence and compensation methods for the predictive DPC strategy.