Application Of Active Disturbance Rejection Control In Photovoltaic Microgrid

Photovoltaic power generation is a renewable clean energy power generation.It is widely distributed throughout the country and has strong applicability.It is a new energy power generation method that is easy to implement and easy to install.Solar energy is converted into electrical energy by photovoltaic power generation units and output to the load and grid.Of course,it also needs to go through the filtering link and the converter link.Correspondingly,the control link of the entire system is also essential.This article focuses on traditional control methods.The power oscillation is too large,the dynamic response is too slow,the Active disturbance rejection control(ADRC)control algorithm is studied and improved.In this paper,a simulation experiment is performed on the Simulink platform,and different control methods and Active disturbance rejection control are tested.Control effect,the specific content of this article is as follows.First,model each module of the photovoltaic microgrid and design the topology of the entire system.The photovoltaic microgrid system uses a photovoltaic array at the front end,followed by a boost chopper circuit with a maximum power point tracking algorithm,and then Connect the three-phase inverter circuit and LC filter circuit.The three-phase inverter circuit is controlled by the svpwm signal.Each parameter of each module is reasonably designed,and the output characteristics of the photovoltaic array under different light are considered.Secondly,the active disturbance rejection controller is researched,the working principle of active disturbance rejection control and the effects of each order of active disturbance rejection control are studied.The applicability of the first order adaptive disturbance rejection controller in the microgrid system is discussed.The control system selects the most suitable Active disturbance rejection controller.Aiming at the shortcomings of the traditional disturbance observation method,a first-order auto-disturbance control is applied to the maximum power tracking.For the problem of excessive output power oscillation,a variable gain active disturbance rejection control is adopted.Compared with the disturbance observation method,it has obtained The better control effect proves that the active disturbance rejection control algorithm is effective.Combining a linear first-order active disturbance rejection controller with a virtual synchronous generator(VSG),for the problem of power oscillation,not only active disturbance rejection control but also additional current compensation control are added.The results show that the proposed control method is superior.Finally,combining the active disturbance rejection control technology and Unified power quality conditioner(UPQC),a left-series right-parallel UPQC with active disturbance rejection control is designed.The active disturbance rejection control is used instead of the simple PI control.The comparison of control strategies proves that the active disturbance rejection control technology is effective in UPQC,which improves both dynamic performance and steady-state performance.