Linear Active Disturbance Rejection-Based Load Frequency Control In Isolated Microgrid

Electricity is the main power in the modern industry. Microgrid as one of the development direction of electric power, the power quality of which is higher, the requirement of control quality is also becoming higher and higher. The widespread application of PID controller is difficult to obtain satisfactory control effect as the features such as strong random, turbulent, nonlinear of microgrid load frequency control problems becoming more and more outstanding.Therefore, people are always looking for better control technology, Linear Active Disturbance Rejection Control is one of the control technologies.This dissertation is based on the normal LADRC, it combined the algorithm of particle swarm, which is based on the nature selection, and make LADRC controller easier to be fulfilled and more popular. Based on the method above, and focused on a traditional problem of isolated microgrid load frequency control, according to its block diagram, this dissertation deduce its certain transfer function model, and research LADRC four-level extended state observer. Compared with the simulation result of the method of traditional PI controller, it shows that, for certain condition, LADRC can make a good tracking performance at a low control power, and it had a distinct advantage of resisting the disturbance of the noise. Furthermore, by modifying the parameters, LADRC will be more robust, which fulfills the purport of all-regime control by using single controller. The LADRC method is also suitable for using at other microgrid control systemThis article preliminary studied microgrid load frequency control problems which contain the large-scale wind power, Introduced the control principle of the doubly-fed induction wind turbine which support microgrid frequency adjustment, For the control model containing large-scale wind power,compared with PI control-ler and fuzzy PI, this study analyze the performance of LADRC controller Analysis and simulation results consistently show that the LADRC effective wind permeability increase influence on microgrid frequency control, and has a robustness performance to some degree.The research result of this article shows that LADRC have a certain bright future in the control problem of microgrid load frequency control problems.