Key points are not available for this paper at this time.
An inverter-based-resource (IBR) power plant can consist of several hundred individual inverters which are collectively controlled by a power plant controller (PPC). The PPC dispatches set points to individual inverter's to achieve the control objective as demanded by a supervisory controller at the point of interconnection (POI). Due to the differences in measurements between the inverter terminals and the POI, there could be some interactions between the PPC and the inverter controllers. One such interaction is reported in this work, which caused voltage fluctuations and inverter trips in operational power plants. These fluctuations are studied, and the mechanism of such interactions are analyzed. The observed fluctuations are caused by the PPC pushing the inverter into fault ride-through (FRT) mode and the inverters shuttling between normal operation and FRT. Approaches to mitigate such oscillations from the plant side and the inverter side are proposed. Simulations results are presented to validate the proposed control approaches.
Pattabiraman et al. (Mon,) studied this question.