The report, titled "The Development of New Approaches for Improved Stability and Robustness of PHIL Simulations," presents the findings of the DevA-PHIL project during the laboratory visits by the JRC team to the RSE (Ricerca sul Sistema Energetico) laboratory in Milan. This project aimed to enhance real-time simulations, particularly those involving Power Hardwarein-The-Loop (PHIL) setup, which is essential within the European ERIGrid 2.0 project. The primary objective was to study the behaviour of complex power systems through real-time simulations, addressing operational challenges posed by the rise of renewable energy sources. The project focused on conducting delay analysis, characterizing harmonic spectrums, developing transfer functions for real systems, and validating models to assess PHIL simulations' sensitivity to delays and disturbances. The report highlights the importance of these simulations in the backdrop of the EU's decarbonization targets, which require enhanced operational capabilities in the electricity network. PHIL and CHIL simulations represent an asset for testing new technologies and predicting their real-world performance. This collaborative effort included experiments to address PHIL setups' stability and accuracy, involving delay analysis, Fast Fourier Transform (FFT) analysis, and developing transfer functions. The experimentation provided crucial insights into time delays affecting PHIL simulations, influenced by the simulator and the hardware. By refining loop delays, the project achieved enhanced reliability, a critical advancement for efficiently deploying new energy strategies. The significant reduction of time delays and development of reliable mathematical models improved system stability and sensitivity assessment. Accurate transfer functions ensured reliable system behaviour representation and the use of low-pass filters has been considered crucial for more robust energy systems. In conclusion, the project underscores the critical role of PHIL and real-time digital simulations in the EU's decarbonization efforts. The ERIGrid 2.0 programme collaboration achieved significant progress in managing the variability introduced by renewable energy sources in electricity systems. As scenarios grow more complex, ongoing research in PHIL simulations is vital for developing resilient and efficient energy solutions. Ultimately, precise PHIL simulations can significantly influence the successful integration of renewable energy sources into the grid, crucial for Europe's energy transition. Continued exploration will deepen understanding and improve PHIL technique applications.