Analysis of high frequency harmonics in distribution networks : 9 - 150 kHz

Improvement of power electronic technologies can also introduce various new types of distortions in electrical power systems due to high switching frequency of power converters. The emissions from one device can create noticeable impact on other devices connected to the same system, which may raise immunity concerns. Moreover, power line communication and ripple control signaling may have implications due to the presence of these harmonics. This paper demonstrates analysis of harmonic distortions in the frequency range of 9 - 150 kHz in low voltage distribution networks. Detailed study of voltage and current harmonics is performed based on field measurements with different load characteristics and solar inverter integration. A simulation study of 5 kW inverter control is shown to demonstrate the effect of controller strategy for current harmonics. The results could be useful in development of high frequency harmonic regulations for grid connected inverters in distribution networks.