Research On Virtual Inertia Control In Load Frequency Control Of Renewable Power System

Due to the reduction of fossil fuel reserves and the high price of fossil fuels,energy security and environmental impact have attracted more and more attention.Replacing traditional energy output with clean energy power generation has now become the most popular development direction.As one of the renewable energy sources,wind power generation has become the most concerned new energy generation mode due to its economic benefits and development prospects.With the gradual increase in the penetration rate of wind power,the integration of wind power into the grid will pose new challenges to the stability of the power system.Research on the load frequency control problem of power system with high penetration rate wind power has become a subject of great research significance.Based on the study of load frequency control of interconnected power system with high permeability wind power.The article establishes a load frequency control model for traditional thermal power plants and wind farms,and analyzes that when the penetration rate of wind power in the grid is increasing,the inertia response ability of the power system is reduced,which brings new challenges to the stable operation of the power system.So it is proposed concept of virtual inertia is followed by the establishment of a multi-area interconnected power system with the intervention of wind turbines based on virtual inertia control,to improve the inertial response capability of wind turbines.The article establishes two different interconnected power system models on whether to implement virtual inertia control for wind power.Distributed model predictive control is used to design the controller.Since both thermal power and wind power systems have non-linear links,they are transformed into system constraints,and constrained optimization problems are solved through quadratic programming,and through information exchanges between regions,the current time of each subsystem is iteratively obtained optimal solution.Two mathematical models of wind power system load frequency control with virtual inertia control and without virtual inertia control are used for simulation analysis.The results show that the load frequency control of the power system under the intervention of wind power based on virtual inertia control has good dynamic characteristics,and its application in the actual power system has important practical significance.