Design and control strategy of solid state transformer using CHB, MMC and 5-L ANPC multilevel converters

Sotoodehkia, Mohammad Saber; Arasteh, Mohammad; Soleymani Mucheh Khorti, Soodabeh; Hoseinpour, Majid

doi:10.22075/ijnaa.2022.28249.3844

Design and control strategy of solid state transformer using CHB, MMC and 5-L ANPC multilevel converters

Document Type : Research Paper

Authors

Mohammad Saber Sotoodehkia ¹

Mohammad Arasteh ²^{, 2}

Soodabeh Soleymani Mucheh Khorti ³

Majid Hoseinpour ⁴^{, 1}

¹ Department of Electrical Engineering, Kish International Branch, Islamic Azad University, Kish Island, Iran

² Department of Electrical Engineering, University of Science and Culture, Tehran, Iran

³ Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.

⁴ Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

10.22075/ijnaa.2022.28249.3844

Abstract

In this paper, the process of designing and comparing cascaded H-bridge (CHB) converter, modular multilevel converter (MMC), and five-level active neutral-point clamped (5L-ANPC) converter as a solid-state transformer (SST) utilized in the distribution network was investigated. The design was based on 1.7 kV IGBT modules (for CHB and MMC converters) and 3.3 and 4.5 kV IGBT modules (for 5L-ANPC converter). The converters were compared at voltage levels of 6.9, 11, and 20 kV and power levels of 0.5 and 2 MW. As well, when the number of MC voltage levels increases, the complexity of the control system, as well as the control algorithm, increases largely. In order to simplify the control system, a hierarchical control system is designed for these MCs. In the process of designing converters, thermal analysis and selecting smaller parts with lower losses due to enhanced efficiency were considered.

Keywords

Active NPC (ANPC)

Cascaded H-bridge (CHB)

Modular multilevel converter (MMC) efficiency

Modular multilevel converter (MMC)

Solid state transformers (SST)

Control systems

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