Novel Harmonic Emission Limit Concept for Series-connected Distorting Installations Connected to Transmission Systems

The current technical standards for allocating harmonic emission limits in transmission systems do not consider series-connected distorting installations (like TCSC, HVDC links, etc.). This paper introduces a novel approach for the calculation of harmonic emission limits for series elements. The approach is developed based on the results of simulations of a test network with TCSCs connected in different lines, which showed that TCSCs have a considerable effect on the harmonic emission, and therefore series elements should be considered in the allocation process. Different global and local approaches for the harmonic emission limits allocation are proposed and applied exemplarily to the considered test network.