Research On Virtual Synchronous Generator Oscillation Control Method Based On Adaptive Control

With the reduction of fossil energy sources and the worsening of environmental pollution,people have begun to pay more and more attention to the development and utilization of new clean energy sources such as solar energy and wind energy in the power grid,increasing the proportion of new energy generation in the world's total power generation.But since new energy generation has almost no rotational momentum,the inertia of the entire power system will continue to decline as it is integrated into the grid on a large scale.This results in the failure of the whole system to ensure normal and stable output when the power grid is subject to external interference or large fluctuation of load,resulting in system disconnection in severe cases.To solve this problem,virtual synchronous generator technology was born.Based on the technology of virtual generator,the structure and parameters are studied and improved,and a new adaptive control strategy is proposed to improve the stability of the system.First,the topological structure of the virtual synchronous generator is analyzed,and the function and role of each structure are clarified.Based on this,the main control module and its mathematical model are established,and the energy transfer between the models is analyzed.In addition,the main parameters of the system are analyzed for its stability performance,and the effects of the changes of the parameters on the system are described.Then,by analyzing the change of the oscillation power angle of the system,a cooperative adaptive relationship between the virtual inertia and the damping factor and the frequency deviation is constructed,which can effectively reduce the oscillation amplitude and oscillation time of the system.Then,the optimal value of each adaptive parameter is selected by using chaotic particle swarm algorithm,and the model was built in MATLAB/Simulink software,so as to verify the effectiveness of the strategy in optimizing the stability of the system.Finally,the control characteristics of the DC side and the AC side are comprehensively utilized,and the combination of adaptive droop power and adaptive DCside capacitive inertia control greatly reduces the power transient impact,thereby preventing the system from oscillating due to weak bearing capacity.Then the theoretical analysis of the system parameter setting and stability is carried out,and the effectiveness and superiority of the strategy are verified by comparing the simulation results under various operating conditions.