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Double Wye Modular Multilevel Converter Direct Dc-dc Topology

IP.com Disclosure Number: IPCOM000235992D
Publication Date: 2014-Apr-01

Publishing Venue

The IP.com Prior Art Database

Related People

Pawel Klimczak: INVENTOR [+2]

Abstract

MMC (Modular Multilevel Converter) is still interesting solution for some medium voltage and high power (10-100 MVA or more) applications, like STATCOM, hydro pump, grid interties or energy storage. Existing topologies cover ac-dc, direct ac-ac, delta and wye. By connection of ac-dc and dc-ac stages (dc side connected) so called indirect ac-ac is achieved. Alternatively, connection of dc-ac and ac-dc stages (ac side connected) will result in dc-dc converter (indirect dc-dc). In this publication new topology for direct dc-dc converter is proposed. This is so called double wye (double Y, YY) MMC direct dc-dc. The proposed topology is derived from indirect dc-dc (dcac- dc). Compared to the original one, the new topology consists lower number of PEBBs (Power Electronic Building Blocks) for the same voltage and current rating. The new topology operation is described for buck and boost operation and key formulas are provided. Also extension of the new topology is proposed. Finally, key references are provided to the reader.

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Page 01 of 29

Date 2014-03-26

Double Wye MMC Direct Dc-dc Topology

Page 1

Double Wye Modular Multilevel Converter Direct Dc-dc Topology

Abstract

MMC (Modular Multilevel Converter) is still interesting solution for some medium voltage and high power (10-100 MVA or more) applications, like STATCOM, hydro pump, grid interties or energy storage. Existing topologies cover ac-dc, direct ac-ac, delta and wye. By connection of ac-dc and dc-ac stages (dc side connected) so called indirect ac-ac is achieved. Alternatively, connection of dc-ac and ac-dc stages (ac side connected) will result in dc-dc converter (indirect dc-dc).

In this publication new topology for direct dc-dc converter is proposed. This is so called double wye (double Y, YY) MMC direct dc-dc. The proposed topology is derived from indirect dc-dc (dc- ac-dc). Compared to the original one, the new topology consists lower number of PEBBs (Power Electronic Building Blocks) for the same voltage and current rating. The new topology operation is described for buck and boost operation and key formulas are provided. Also extension of the new topology is proposed. Finally, key references are provided to the reader.

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Page 02 of 29

Date 2014-03-26

Double Wye MMC Direct Dc-dc Topology

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TABLE OF CONTENTS

 Abstract.............................................................................................................................................................................. 1
Table of Contents ................................................................................................................................................................2
1 Introduction .................................................................................................................................................................. 3
2 Prior art ......................................................................................................................................................................... 5
2.1 A Methodology for Developing "Chainlink" Converters (1) ......................................................................5
2.2 A Versatile dc-dc converter for energy connection and distribution using the modular multilevel converter (2) ..................................................................................................................................................................... 5
3 The proposed topology deriviation .........................................................................................................................7
3.1 Number of PEBBs required comparison ...................................................................................................... 8
4 Operation principles...........................................