Frequency Response Characteristic Analysis of Wind-Solar-Thermal-Nuclear-Storage Systems Based on Refined Nuclear Power Modeling

With the increasing proportion of renewable energy installations, the inertia of the power system decreases. There is an urgent need to investigate the impact of nuclear power units and renewable energy units participating in frequency regulation on the power system. However, the current high-order models of nuclear power units are not suitable for frequency regulation analysis. In this paper, the existing models are simplified to establish detailed mathematical models of nuclear power units that are suitable for the frequency response characteristics analysis. Subsequently, based on the frequency regulation control principles of renewable energy units, electromagnetic transient models for wind turbine units, photovoltaic power units, and energy storage units are developed. Finally, an advanced IEEE nine-bus power grid simulation model incorporating wind, solar, thermal, nuclear, and energy storage units is established on the MATLAB/Simulink platform, and the impact of nuclear power and renewable energy participation in frequency regulation on the frequency response characteristics of the power system is analyzed. The results indicate that the participation of nuclear power and renewable energy in frequency regulation can provide additional regulation capability, significantly improving the frequency response characteristics of the system.