Inhibiting mains current distortion for SWISS Rectifier - a three-phase buck-type harmonic current injection PFC converter

Abstract

In this paper, a competitive three-phase buck-type PFC converter named SWISS Rectifier is comprehensively researched to inhibit mains current distortion. The control structure which would realize PFC function but also introduce harmonic components to mains current is illustrated and improved to achieve better performance. The origin of the mains current distortion occurred at the sector boundaries is analyzed. Advance modulation scheme and damping strategy are proposed to improve mains current quality. A 10kW-100KHz hardware prototype is designed and experiments results are presented to verify theoretical analysis.

SWISS rectifier structure sector boundary current distortion suppression based on multi‐step predictive control

“…Assuming an initial AC capacitor voltage of 0 and taking into account the symmetry of the three-phase input, the sum of the three capacitor voltages is also 0, as is the sum of the threephase supply voltages. As a result, the mathematical model of the AC-side inductance can be represented by Equation (10).…”

“…In the literature [9], the causes of this phenomenon are described in detail, and the modulation method is improved by applying an algorithm to reduce the current distortion, and the improvement of the current distortion by the improved modulation method is discussed in the case of an asymmetric grid voltage input, but the implementation of the algorithm is slightly complicated and some problems caused by the backward shift of the filter capacitor are not clearly solved. In the literature [10], an improvement of the control structure was made for the SWISS rectifier current distortion problem, and a modulation scheme and a damping strategy were proposed to eliminate the grid current distortion at the sector boundary, but the specific modulation implementation was not described and has some limitations.…”

AC Grid–DC Microgrid Coupling with High-Performance Three-Phase Single-Stage Bidirectional Converters

“…An ultra-high efficiency-interleaved Swiss converter with Silicon Carbide (SiC) devices is demonstrated in [21]. Modified modulation techniques for the Swiss converter are presented in [22,23] to improve grid current distortions. Moreover, an isolated Swiss converter is reported in [24], which employs full-bridge topology to the Swiss rectifier to attain both the soft switching and the high-frequency galvanic isolation.…”