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Current Balancing Control Methods Using Advanced Carrier-Based Modulation for Five-Level Current Source Rectifiers | IEEE Journals & Magazine | IEEE Xplore

Current Balancing Control Methods Using Advanced Carrier-Based Modulation for Five-Level Current Source Rectifiers


Abstract:

In an ideal ac-dc five-level current source multilevel converter, the dc current is equally divided between the two converters connected in parallel. However, current imb...Show More

Abstract:

In an ideal ac-dc five-level current source multilevel converter, the dc current is equally divided between the two converters connected in parallel. However, current imbalances occur due to the nonidealities of the system, making the current balancing control to improve the multilevel converter performance. This article proposes two different methods for dc current balancing control for a five-level current source rectifier using an advanced carrier-based modulation strategy implemented through three different modulation patterns. A 6-kW prototype is constructed to demonstrate the current balancing control and a comparison among the methods is presented.
Published in: IEEE Transactions on Power Electronics ( Volume: 35, Issue: 10, October 2020)
Page(s): 10213 - 10226
Date of Publication: 19 March 2020

ISSN Information:


I. Introduction

Power electronics has undergone much evolution in the last decades [1]. The trends of higher electrification levels and control for commercial, industrial, transportation, and medical applications created a significant increase in its role [2]. Three-phase ac–dc current source converters (CSCs) have been gaining attention in several applications, typically where a single-stage nonisolated converter is able to perform active power factor correction and tight control of the dc-side current. An example of a five-level CSC (5L-CSC) circuit is shown in Fig. 1, where higher performance than a three-level topology can be achieved regarding physical dimensions and efficiency mainly due to potentially lower current efforts and better losses distribution. It can be seen that two conventional three-level six-switch CSCs are connected at their dc ports through two interphase transformers , with . This transformer is used with the aim of dividing the current between the two converters and limit the circulating currents among them. The polarity of the transformer is reversed in order to cancel the local average transformer core flux. Fully separated inductors could also be used in place of the interphase transformers (IPTs) and dc-side inductors while resulting in similar waveforms at the ac- and dc-side ports.

References

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