Research on Control Strategy of DC Microgrid Based on Linear Active Disturbance Rejection Control

Natural resources such as photovoltaic energy are greatly affected by the external environment, and Maximum Power Point Tracking (MPPT) control method can adaptively track changes in the external environment. So that the distributed power supply maintains the maximum output state and improves the utilization rate of natural resources. The complexity and variability of the external environment will lead to DC bus voltage fluctuation, stable DC bus voltage is the key to the stability of DC microgrid. Linear Active Disturbance Rejection Control (LADRC) overcomes the shortcomings of traditional Active Disturbance Rejection Control (ADRC) with many control parameters, and has the advantages of fast response and good stabilization effect. In this regard, this paper firstly utilizes the perturbation observation method to realize the maximum power point tracking. Secondly, a first-order linear model is established for DC bus current, and Linear active disturbance rejection control is used to reduce DC bus voltage fluctuation, and the control effect is compared with PI control to observe the voltage stabilization effect under different conditions and improve the stability of DC microgrid.