Research On Maximum Power Point Tracking Technology Of Photovoltaic System Based On Active Disturbance Rejection Controller

In the natural environment of photovoltaic modules,the uncertainty of solar illumination intensity and temperature makes the output power of photovoltaic power generation system have great fluctuation and uncertainty,and the power quality cannot be guaranteed.In this paper,the dynamic performance and steady-state performance of the output grid-connected current under the traditional control strategy are studied and improved,and The maximum power point tracking controller is designed by means of adrc.The specific work contents are as follows:Based on the analysis of the output characteristics of photovoltaic cells,Boost dc converter was selected to build the photovoltaic power generation system model in Simulink.Aiming at the photovoltaic power generation system,the control principle of MPPT is studied,and the traditional PID control algorithm is analyzed.The MPPT controller based on the PID algorithm is designed.It is found that it has the defects of slow response speed and poor anti-interference ability.And then compared the PID algorithm under the outside conditions change performance is poorer,design the MPPT controller based on linear adrc,The unknown disturbance of the photovoltaic system and the external disturbance are summed up into the compensation for the total disturbance of the system,analyzes the tracking differentiator,and the design of the extended state observer and nonlinear error rate structure and presents a simulation model of simulated in Simulink environment,and compares with the traditional PID control algorithm,The simulation results show that the designed linear adrc MPPT controller can guarantee the control accuracy,there is no overshoot and the adjustment time is obviously reduced,the robustness is improved,and the control effect is better than PID control.The dynamic characteristics of the solar cell series circuit are analyzed,and the global maximum power tracking control strategy based on the optimal initial value conductance increment control based on the dynamic interval of the maximum power point is improved,which speeds up the tracking speed of the algorithm.In the simulation experiment,the circuit model of three photovoltaic cells in series was used to verify its tracking performance under the condition of stable and uneven illumination.The final work of this paper is to build a photovoltaic system control platform and applythe designed linear adrc to the actual photovoltaic simulation system.The experiment shows that the controller can resist the disturbance very well for the solar power system which is easy to be influenced by external factors and has poor anti-disturbance ability.