NDLI: Four-port solid-state transformer based on hybrid MMC with enhanced dual half-bridge submodules

Content Provider	IET Digital Library
Author	Li, Dongye Ji, Zhendong Sun, Yichao Zhao, Jianfeng Zhang, Chi
Abstract	This study presents a novel solid-state transformer (SST) with four ports that can connect the medium-voltage (MV) DC bus, the MV AC bus, the low-voltage (LV) DC bus, and the LV AC bus, respectively. This SST is suitable for application in the hybrid AC/DC power grid that functions as an energy router between AC and DC systems. Furthermore, the SST submodule is enhanced with two types of dual-half bridge converters, namely DHSM1 or DHSM2, depending on if an additional active switch is used to block the possible short circuit. Thanks to the designed structure of the proposed SST that combines DHSM1 and DHSM2 as the front-end stage, it achieves reduced hardware complexity with the remaining capability to handle the DC short-circuit fault that may occur at the medium- or high-level voltage DC grid. In addition, an optimised overall control strategy that can reduce the measurement demand and control complexity is proposed, with the possible power flow path inside the SST fully analysed. Simulation and experimental results validate the feasibility of the proposed SST and the effectiveness of the overall control scheme with the DC fault handle capability.
Starting Page	2432
Ending Page	2441
Page Count	10
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 12, Sep (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.1304
Journal	IET Power Electronics
Publisher Date	2020-05-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC-DC Power Converter Additional Active Switch Bridge Circuit Control Complexity Control of Electric Power System DC Fault Handle Capability DC Short-circuit Fault DC-DC Power Converter DHSM1 DHSM2 Dual-half Bridge Converter Enhanced Dual Half-bridge Submodules High-level Voltage DC Grid Hybrid MMC Load Flow Control Low-voltage DC Bus LV AC Bus Measurement Demand Medium-voltage DC Bus MV AC Bus Novel Solid-state Transformer Port Solid-state Transformer Possible Power Flow Path Possible Short Circuit Power Converter Power Electronics Power Grid Power Supplies to Apparatus Power Supply Power System Control Power Transformer Power Transmission Fault SST Submodule Supervisory Circuit Switching Converter Transformer And Reactors
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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