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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
