Modeling and Coordinate Control of Circulating Currents in Parallel Three-Phase Boost Rectifiers

• Published in: IEEE transactions on industrial electronics (1982) Vol. 54; no. 2; pp. 825 - 838
• Main Authors: Pan, Ching-Tsai, Liao, Yi-Hung
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2007; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Circuit faults; Circulating; Circulating current; Circulation; Control systems; Costs; Differential equations; Impedance; Inductors; Industrial electronics; Mathematical models; parallel system; Power supplies; Pulse width modulation; Rectifiers; Simulation; Space vector pulse width modulation; Strategy; Support vector machines; Switching converters; three-phase boost rectifiers
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2007.891776

In this paper, definition of the circulating currents of multiphase paralleled converters is first presented, and the circulating-current-generating mechanism is clearly explained. Thus, based on this definition, an averaged model of the circulating current is proposed. It is seen from this model that the circulating current consists of not only the zero-sequence but also the nonzero-sequence components. The governing differential equation also shows explicitly the relation between the circulating currents and the affecting factors such as different pulse width-modulation strategies. With this understanding, a simple coordinate control is then presented to reduce the circulating current. The phenomenon of the intrinsic circulating current is also explained. Furthermore, a prototype system is constructed, and the proposed control is implemented using TMS320F2812 DSP. Both simulation and experimental results verify the validity of the proposed theory and control