An Integrated Interlinking Converter with DC link Voltage Balancing Capability for Bipolar Hybrid Microgrid

Document Type : Research Paper

Authors

1 Power systems group- Computer and electrical engineering faculty- K. N. Toosi University- Tehran- Iran

2 Electrical Engineering Department, Islamic Azad University, East Tehran Branch, Tehran, Iran

Abstract

Interlinking converter topology on bipolar hybrid microgrid is gaining increasing attention during last years. The heart of bipolar hybrid microgrid structure is the interlinking converter that plays the primary role in this structure. This interlinking converter has decisive tasks in the microgrid control system and controlling the dc-bus is one of the critical ones. This paper investigates application of a 10 switch inverter as an interlinking converter for a bipolar hybrid microgrid and aims to increase the power quality on both AC and DC side, and enhance efficiency in such systems. The 10 switch converter costs less in comparison to other multilevel converters and also diminishes volume and application costs. A modified modulation method and a novel control system is proposed for this converter which results in reducing computations for modulation, and adds the ability to control the dc-bus independently in unbalance dc bus conditions. Unlike conventional converters used for these microgrid types, this converter does not need any additional DC/DC converter to act as a balancer converter to balance dc-link pole voltages. The superiority of the proposed modulation and control strategy of 10 switch converter is studied in a simulation system, and the 10 switch converter results are compared to conventional topologies. The costs and semiconductor power loss of studied interlinking converters are evaluated and compared to prove the advantages of the proposed interlinking converter.

Keywords

References

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Journal of Modeling in Engineering
Volume 18, Issue 60
June 2020
Pages 201-216

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History

  • Receive Date: 03 February 2019
  • Revise Date: 03 June 2019
  • Accept Date: 04 September 2019

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