Study on the Impact of Renewable Energy Power Generation Transient Characteristics on System Stability in Weak Grid

Abstract

With the large-mount access of renewable energy to the electric power grid, the unique seasonal and day and night output fluctuation of renewable energy power generation has brought new challenges to the stable and safe operation of the power system. These challenges mainly include the impact on power grid voltage stability, frequency stability and power angle stability. Therefore, the impact of renewable energy power generation on the stable and safe operation of power system should be be paid enough attention. Due to the characteristics of long-distance, large-scale and high concentration of grid connected renewable energy, the ability of AC system to connect to power grid is relatively weak, which is a typical weak current network. With the continuous expansion of renewable energy grid connection scale, the dynamic characteristics of weak current power grid become more complex, which brings great challenges to the stability and security of power grid. However, in the calculation of power system security and stability, more conservative renewable energy generation model parameters are often used to fix the power grid operation reliability. For better improve the renewable energy acceptance capacity of the system, the proportion of renewable power generation will be further increased. Therefore, establishing an accurate and reasonable renewable energy model is the basis of large-scale renewable energy grid connection security and stability calculation. Further study on the control strategy and parameter adaptability of renewable energy model could be reduced stability risk of high proportion of renewable energy connected to weak current network.