Abstract
This paper describes a harmonic analysis model for CRH2 EMU (Electric Multiple Unit) and provides a harmonic power flow algorithm for its traction power supply system. This algorithm gives full consideration to coupling influence between the traction networks (harmonic voltage), and the fundamental wave results are used as the final convergence condition, aiming to determine modulation characteristics and harmonic current characteristics of SPWM converter for EMU based on results of harmonic power flow, and to calculate harmonic power flow and to update fundamental power of harmonic source for fundamental power flow calculation. Analysis of harmonic power flow with single harmonic source and multi-harmonic sources shows that the algorithm is applicable to traction power supply system of high-speed rail with single harmonic source, multi-harmonic sources, and background harmonic.
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