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The purpose of this paper is to study power electronic device harmonic models for multi-phase network simulation.Among the most popular frequency domain analysis methods, harmonic injection and harmonic power flow become in widespread use.But the key point of frequency domain simulation is the non-linear harmonic source modelling.This paper presents a new concept for non linear load modelling.Here each harmonic or inter-harmonic source is individually considered in order to take into account interactions between sources.Thus for a given harmonic source model, when the simulation frequency is determined by this source, it will work as an active current injection with infinite impedance.While the frequency is given by other sources, this model will work as impedance depending on the frequency in order to obtain harmonic effects due to other disturbance sources.Keywords: Frequency domain modelling, advanced static converter model, power electronic device, harmonic source modelling, load flow, harmonic impedance, inter harmonic, multi cycle symmetrical control (MCSC).Another contribution of this paper is to study inter-harmonics generated by multi cycle symmetrical control system which is used in heating control device.This kind of system doesn t generate harmonies, but it causes inter harmonic issues.The inter-harmonic may deteriorate grid communication system used in smart grid.A number of multi phase harmonic source models have been created for common industrial and residential power electronic devices.These models have been successfully used for grid and embedded system harmonic analysis in a number of case studies.