Research On Maximum Power Tracking And Islanding Detection Technology Of Photovoltaic Power Generation System

At this stage,with the country's vigorous development of green and clean energy,the photovoltaic solar industry has developed rapidly in China,not only in terms of quantity,but also in terms of technical support.For photovoltaic solar power generation systems,due to the grid-connected control technology,if there is a problem with the control strategy,it will affect the overall power generation efficiency of the system.The most critical factors in the grid-connected control technology include maximum power point tracking control and islanding detection technology.For these two control technologies,scholars at home and abroad have made systematic research over the years and have achieved gratifying results.Based on the 20 MW photovoltaic power station and the actual situation of the photovoltaic power generation system,this paper further optimizes the maximum power point tracking control and islanding detection technology.First,in the actual operation process,the maximum power point tracking control of the photovoltaic power generation system may be excessively oscillated(INC).In order to reduce the occurrence of this situation,it can track the maximum power point when the external environment changes drastically.This paper uses the variable step size conductance increment method to improve it.In order to make the system more stable and reduce the occurrence of misjudgment,the superiority of the control method can be improved by adding a power prediction module.In this paper,the feasibility of each method is verified by using MATLAB simulation software.The simulation results show that if the light intensity changes suddenly,the algorithm can quickly track the maximum power point of the photovoltaic cell,whether it is dynamic performance or static performance.Achieve the desired goals.Secondly,in the research process of this paper,an active island detection method is selected,and the simulation analysis of the island detection technology is carried out.The test steps and methods of the island detection test platform are described in detail.The test results are consistent with the theoretical analysis.Achieved the desired effect.In this paper,based on the actual situation of photovoltaic grid-connected power generation control system,the maximum power point tracking control and islanding detection technology are deeply studied.The simulation software proves that the proposed control strategy is correct and enhances the reliability of the system.