Abstract
This paper introduces the implementation of a DC–AC step up isolated converter from associations of bidirectional Conversion Standard Cells (CSCs). The designed multi-cell converter is an array of standardized converter cells. It is described and then compared to a reference converter with respect to differential mode conducted electro-magnetic interference (EMI). The paper outlines the motivation for developing a generic multi-cell approach before underlining the benefits from the point of view of conducted EMI when implementing power converter arrays (PCAs). In particular, it is shown that in PCAs, the differential mode (DM) EMI filter can advantageously utilize distributed CSCs, making it possible to use very low value AC inductors to filter the AC current ripple. Experimental results are provided to validate the analysis carried out in the paper.
Highlights
Isolated DC-AC step up bidirectional converters are presently of great interest for connecting storage batteries to the grid for many applications, such as electric mobility and remote applications, as well as renewable energy storage [1,2,3]
The paper investigates, from both theoretical and experimental points of view, the benefits of such a power converter array compared to the reference topology, which is the H-bridge plus a dual active bridge (DAB) converter
electro-magnetic interference (EMI) signatures, the combination of lower nominal voltages and/or currents with interleaved control produces switching events with lower magnitudes that are distributed over the switching period, leading to higher apparent switching frequency, equals to the converter cell switching frequency multiplied by the number of Conversion Standard Cells (CSCs) implemented
Summary
Isolated DC-AC step up bidirectional converters are presently of great interest for connecting storage batteries to the grid for many applications, such as electric mobility and remote applications, as well as renewable energy storage [1,2,3]. With a 400 V DC bus, the DC-AC full bridge imposes important electro-magnetic compatibility (EMC) filtering constraints for both differential mode and common mode currents This relatively high voltage level imposes significant constraints on the DAB transformer optimization. In order to reduce these constraints, another way to implement this cascade conversion is to divide the converter into several low voltage conversion stages called conversion standard cells (CSC). The paper investigates, from both theoretical and experimental points of view, the benefits of such a power converter array compared to the reference topology, which is the H-bridge plus a DAB converter. The objective is mainly to identify differential mode (DM) AC side filtering stage optimizations In from both theoretical and experimental points of view, the benefits of such a power converter array compared to the reference topology, which is the H-bridge plus a DAB converter. The last section provides analysis and comments on the obtained results
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