Research On Droop Control Method Of Microgrid Based On Virtual Power

The National 14 th Five-Year Plan and the 2035 Vision outline point out the need to build a clean,low-carbon,safe and efficient energy system,improve the energy supply guarantee capability and accelerate the construction of microgrids.The droop control method is an important method to control the operation of microgrid shunt inverters,which has a prominent role in improving the safety and stability of microgrid,but this method has the problem of power equalization and loop current formation due to the line impedance mismatch.In this paper,the above problems of microgrid droop control are investigated.In this paper,a mathematical model of microgrid shunt inverter is established and the characteristics of traditional droop control methods are analyzed.For the coupling relationship between active and reactive power,a coordinate decoupling matrix is established,which can reduce the influence of reactive power on frequency and active power on voltage.For the line impedance mismatch problem,based on the traditional droop control,virtual impedance is introduced to eliminate the influence on power distribution when the line is resistive.This paper proposes an adaptive droop control method based on virtual impedance,which can adjust the droop control coefficient adaptively according to the load change of load microgrid.A parallel inverter simulation model is established on Matlab/Simulink,and the results show that the method can optimize the droop control coefficient and improve the power quality.In this paper,PSO position and velocity based droop control method is proposed.By introducing influence factors to the search position and speed of the particle swarm algorithm,it can avoid the particles from blindly seeking the best,optimize their search direction and position,and improve the search speed and accuracy.The PSO droop control simulation model is established on Matlab/Simulink,and the simulation verifies that the power is proportionally distributed and the loop flow between inverters is suppressed.In addition,this paper designs a distributed power monitoring system based on Labview,and establishes a friendly human-computer interaction interface,which can realize data query and fault alarm functions.Finally,the testing of each function is completed on the basis of PV and doubly-fed wind power generation models,which can realize the monitoring of microgrid.