AUTHOR=Hao Xiaoliang , Fu Lijun , Ma Fan , Hu Liangdeng , Zhang Xueyan 

TITLE=Real-Time Simulation Modeling Method of Multiphase Converters Based on High-Order Approximation in Micro-grid

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 9 - 2021

YEAR=2022

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2021.829382

DOI=10.3389/fenrg.2021.829382

ISSN=2296-598X

ABSTRACT=As more and more distributed energy resources accesed in micro-gird, the electromagnetic transient simulation of the whole system becomes extremely comlicated due to the increase of multiphase converters. The traditional real-time simulation models of multiphase converter are low in efficiency for their large number of electronic switches and power system nodes. To solve this problem, an efficient real-time simulation modeling method based on high-order approximation is proposed. Starting with the symmetry of structure, the twelve-phase converter and induction motor are equivalent to three-phase converter and induction motor, thus reducing the order of the model. The switching function model of three-phase converter is derived, and the mathematical expressions of switching functions are calculated by high-order approximation expansion of the Fourier series, then the dc input current of three-phase converter is formulated theoretically. Counteracting the harmonics by means of phase-shifting, and the high-order approximation model of twelve-phase converter is constructed. Finally, the real-time simulation platform and experimental platform of twelve-phase frequency converter and induction motor are built, the simulation results verify the high efficiency and accuracy of the proposed real-time simulation model compared with traditional models of multiphase frequency converter.