Simulation Study On The Influence Of Virtual Inertia Control On Transient Stability Of Power Grid

With the rapid development and application of new energy,the grid-connected capacity and generation capacity of new energy in power grid are increasing rapidly.On the one hand,the large-scale application of new energy reduces the dependence on traditional fossil energy,increases the application of clean energy,and gradually realizes the sustainable development of energy.On the other hand,the proportion of new energy in the power grid is increasing.Due to the randomness and uncontrollability of new energy,which reduces the inertia of the power grid and has a great impact on the stable operation and control of the power grid.It is of great theoretical significance and engineering practical value to study the safety and stability of power grid under the background of large-scale access of new energy such as wind power and the measures and control methods to improve system stability in the process of new energy access.In this paper,the influence of inertia control link on the stability of power grid is studied in double-fed variable speed wind turbine,and the stability of power grid with scale wind turbine is calculated and analyzed by establishing a simulation model,and the large-scale actual power grid is taken as an example for analysis and verification.The specific work is as follows:Firstly,the paper summarizes and summarizes the influence of large-scale wind power access on the safe and stable operation of power grid,especially the influence on the transient stability of the system,and the influence of virtual inertia control of wind motor on the transient stability of the system,which lays a foundation for the later part of the theory.Secondly,the working principle and control system of doubly-fed variable speed wind turbine are analyzed.The control principle of virtual inertia control of doubly-fed variable speed wind turbine based on maximum power tracking is presented.According to the power angular acceleration and the transient characteristics of the feed and receive terminals,different virtual inertial control strategies are discussed when the output power of the interconnected system meets different conditions.Based on the energy method.Secondly,in DIg SILENT/Power Factory simulation software,a simple small wind-fire hybrid power system simulation model is established,and the wind turbine simulation model is simply described.The virtual inertial control system based on power response is simulated and verified.The transient stability of the power system is verified by simulation considering the virtual inertia control of the fan.Finally,in the large-scale power system simulation software ADPSS,the fan inertial control model is built,and the western Liaoning power grid is simulated to make the theoretical results more universal.