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

Abstract

As more and more distributed energy resources accessing in a micro-grid, the electromagnetic transient simulation of the whole system becomes extremely complicated due to the increase of multiphase converters. The traditional real-time simulation models of multiphase converters 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 a three-phase converter and induction motor and thus reducing the order of the model. The switching function model of the 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 the three-phase converter is formulated theoretically. Counteracting the harmonics by means of phase-shifting, the high-order approximation model of the twelve-phase converter is constructed. Finally, the real-time simulation platform and experimental platform of the 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 the multiphase frequency converter.

HIL real-time simulator based 3D-space vector pulse width modulation for performance analysis of 3-phase matrix converter

“…Among that, Sinusoidal PWM, phase disposition, phase opposes disposition, single and multicarrier PWM, nearest state vector control, and Space vector modulation (SVM) was developed for MC circuits (Palanisamy et al, 2022). In these methods (McGrath et al, 2013;Muktiadji et al, 2022), SVM provides superior recital compared to other classical PWM strategies in terms of reduced harmonics, more utilization of applied ac voltage, minimized switching losses, better selection of switching state vectors, reduction in common mode voltage, avoids filter circuit utilization, and low EMI issues (Hao et al, 2022)- (Palanisamy and Krishnasamy, 2017).…”