The Contrastive Analysis of Control of Microgrid Inverter

The relationship between the rising reproducible energy and the power system is becoming closer, which promote the generalization and employ of microgrid. The access of distributed power brings a series of technical problems to the operation of the system. This paper builds up a mathematical model which can reflect the working principle of the inverters. Based on the physical mechanism, the relationship between electrical signals is analyzed. Through the voltage loop, given two control schemes of microgrid distributed power supply inverters, PID and ADRC (Active Disturbance Rejection Control), especially LADRC (Liner Active Disturbance Rejection Control). Meanwhile ESO is used to control and deal with the state variables. Two typical states of microgrid, isolated island start and abrupt load change, are simulated and compared under the two controls. The simulation results show that the comprehensive control effect of LADRC in microgrid system is better than that of PID.