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Abstract

In a distributed power system based on power electronics building blocks (PEBBs), it is desirable to use a parallel structure with standardized PEBB modules in order to increase power level, provide redundancy and improve system performance. Nonlinear couplings and interactions, however, may occur among the parallel modules. Compared with their counterpart DC/DC converters, three-phase AC/DC or DC/AC converters exhibit stronger dynamics when they operate in parallel. The objective of this paper is to comprehensively analyze the nonlinear dynamics among two parallel three-phase converters. The paper firstly develops a nonlinear average model in rotating coordinates. Based on the model, the nonlinear dynamics, such as small-signal interaction, zero-sequence circulating current and high frequency noise, are analyzed. To improve the system performance and minimize the interactions, some feedback control strategies are proposed. To deal with high-frequency noise, a feedforward control scheme is proposed. The scheme can significantly reduce both common-mode and differential-mode noise. Simulations and preliminary experimental results are presented.

Keywords

parallel circulating current three-phase converters power electronics building blocks

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Dynamics Analysis of Parallel Three-Phase Converters

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