A TSO Perspective on PMU Based Oscillation Monitoring in PEDs Dominated Grid

The growing penetration of power electronic devices (PEDs), such as wind and solar power plants, has introduced new dynamics into power systems, leading to the emergence of oscillatory phenomena that challenge traditional approaches to grid stability. Simultaneously, the increasing deployment of Phasor Measurement Units (PMUs) in power systems has enabled detailed monitoring of system dynamics, offering critical insights into these oscillatory behaviors. Specifically, the installation of PMUs at points of connection (POC) for PEDs provides valuable information about their operational dynamics. This capability has revealed various oscillatory phenomena, the origins of which often remain unidentified, underscoring the need for advanced analytical methods to better understand and address these challenges. This paper focuses on several oscillatory phenomena recorded in the Croatian transmission system by PMUs installed at or near the POCs of new wind and solar power plants. These phenomena include oscillations whose origins are difficult to specify or pinpoint. PMUs, in such cases, have proven to be a valuable resource, but the observed oscillations demand deeper analysis. The paper provides an overview of methods for detecting different types of oscillations and emphasizes the importance of leveraging existing technologies, such as waveform recording, to identify emerging instability phenomena. By capturing high-resolution, synchronized measurements, PMUs equipped with both synchrophasor and waveform capturing functionalities represent a significant advancement in power system monitoring. This paper also discusses novel approaches for configuring these PMUs to optimize data acquisition and transfer, ensuring the efficient delivery of high-fidelity measurement data to central monitoring facilities without overloading communication infrastructure. Additionally, strategies for processing and integrating this data into centralized analysis systems are presented, demonstrating how these advancements can enhance grid stability and operational efficiency.