NDLI: Multi-scale transient modelling and simulation for distribution network-interactive CHB multilevel converters

Content Provider	IET Digital Library
Author	Ye, Hua Kong, Li Tang, Yanan Pei, Wei Deng, Wei
Abstract	This study presents a multi-scale transient model of cascaded H-bridge (CHB) converter for distribution network-interactive studies, which is capable of simulating slow-changing dynamics up to high-frequency switching transients. The switching pulse behaviours of H-bridges are described using the waveform propagation theory. By taking individual H-bridge sub-modules into account, a semi-analytic function (SAF) model of the CHB multilevel converter is developed. It allows for accelerated simulation of switch-type electromagnetic transients (EMTs). During slow-changing dynamics, the developed SAF is converted to a shifted-frequency phasor (SFP) model using the Fourier series expansion. Due to the consistent modulation and complex analytical signal processes, smooth transitions between the SAF and SFP are achieved for different running stages. Moreover, the proposed model is readily integrated with external multi-scale models of the distribution network. The validity of the proposed multi-scale model is performed through case studies that include the CHB internal fault, distribution network faults, and also interactive dynamics between them. The accuracy and efficiency of the multi-scale model is verified through comparisons of the results with those obtained from the full EMT-type programmes.
Starting Page	330
Ending Page	338
Page Count	9
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 2, Jan (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.0535
Journal	IET Generation, Transmission & Distribution
Publisher	The Institution of Engineering and Technology
Publisher Date	2019-11-11
Access Restriction	Open
Rights License	Creative Commons Attribution-Non Commercial-No Derivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Subject Keyword	Bridge Circuit Cascaded H-bridge Converter CHB Internal Fault Complex Analytical Signal Process Distribution Network Distribution Network Fault Distribution Network-interactive Study EMT-type Programmes External Multiscale Model Fourier Series Fourier Series Expansion High-frequency Switching Transients Individual H-bridge Sub-modules Interactive CHB Multilevel Converter Multiscale Transient Model Power Converter Power Distribution Fault Power Electronics Power Supplies to Apparatus Power Supply Power System Power System Simulation Power System Transients Semianalytic Function Model Shifted-frequency Phasor Model Slow-changing Dynamics Supervisory Circuit Switch-type Electromagnetic Transients Switching Pulse Behaviour Waveform Propagation
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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