Assessment of FACTS Devices Nonsinusoidality in Smart Grid

FACTS-devices are the key elements of a Smart Grid. At the same time the nonlinear nature of FACTS devices causes current and voltage waveforms distortion in the electrical network. The article is devoted to the development of methodology for harmonic and interharmonic components assessment generated by FACTS devices. A mathematical model has been developed for harmonics and interharmonics order assessment in electrical network using the method of signal flow graphs. The developed methodology is investigated on the example of a three-phase six-pulse frequency converter with a salient DC link. The result of the research is a dependence diagram of the harmonics and interharmonics order generated by the frequency converter. The considered approach is universal and can be applied to various FACTS devices taking into account the correction of the transfer function.