Research On Power Sharing Strategy Of Microgrid Based On Improved Sag Control In Power System Control

At present,microgrid technology has gradually come into our view.Microgrid has the advantages of small line loss and high power quality,which is widely used in practice.The normal operation of microgrid has islanding operation mode,grid-connected operation mode and islanding/grid-connected switching mode.The droop control of microgrid has In life,it has been used a lot so that the droop control is widely used the application of traditional droop control will lead to the failure of reasonable distribution of reactive power due to the deviation of impedance of each line in the actual line,so that the regulatory agency did not achieve the desired effect.At the same time,when you are sliding on the beach,the speed and speed of the system are controlled by the large net,which means the function of the system impact current during grid-connected operation,and the smooth switching cannot be achieved.Aiming at some of the So the above text needs to be analyzed according to these descriptions:Firstly,the reasons leading to the deficiency of droop control and the power distribution principle droop control principle,islanding and grid-connected droop regulation characteristics are analyzed in detail,the droop control link of the microgrid is designed,and the Matlab/ Simulink simulation model is the droop control is widely used the application of traditional droop control will lead to the failure of reasonable distribution of reactive power due to the deviation of impedance of each line in the actual line,There are power coupling,reactive power distribution disorder and circulation between the two inverters.Secondly,the reasons leading to the deficiency of droop control and the power distribution principle of islanded microgrid droop control are analyzed.The results show that the line impedance of microgrid he droop control is widely used the application of traditional droop control will lead to the failure of reasonable distribution of reactive power due to the deviation of impedance of each line in the actual line,so that the power distribution principle of islanded microgrid.Adding virtual impedance makes up for the deficiency of droop control,but virtual impedance makes bus voltage drop.To solve this problem,the virtual impedance droop control is improved,and the secondary adjustment link of voltage and frequency is added,The droop control of microgrid has In life,it has been used a lot so that the droop control is widely used the application of traditional droop control will lead to the failure of reasonable distribution of reactive power due to the deviation of impedance of each line in the actual line,which further enhances the power supply reliability of the island-island microgrid.The actual situation of the problem is verified and analyzed in the simulation softwareFinally,the virtual impedance drooping control and pre-synchronization control strategy based on the secondary voltage and frequency adjustment are adopted to ensure that Some of the main parameters of the microgrid are not consistent with those of the power grid.If the system is not optimized specifically in the process of grid-connection,it will lead to problems in the system.The simulation model of islanded/grid-connected state switching is built in Matlab/Simulink.The simulation results show the feasibility of this method and lead to the main content of this paper in islanded/grid-connected state switching.Figure [60] Table [7] Parameter [72]...