Impact Analysis And Adaptability Evaluation Of Distributed Photovoltaic In Substation Area On Distribution Network

At present,distributed photovoltaic is more and more widely used,however,it also has many impacts on the distribution network.The instability of photovoltaic power generation will greatly affect the power quality of users.Therefore,the evaluation method of distributed photovoltaic access ed to lowvoltage station area has attracted the attention of relevant departments.This thesis studied and analyzed the principle of distributed photovoltaic,its impact on station area and the establishment of evaluation model.This thesis analyzed the principle and structure of distributed photovoltaic.At first,the thesis introduced the structure of distributed photovoltaic,including DC/DC converter and DC/AC converter,and explain ed the maximum power point tracking method of distributed photovoltaic and the control strategy of inverter grid connection.Finally,the distributed photovoltaic structure was simulated by Simulink and instructed the working mode of distributed photovoltaic with examples.Distributed photovoltaic has many impacts on distribution network,among which the impact on voltage is one of the most important.There fore,the impact of distributed photovoltaic on distribution network voltage was discussed in this thesis.This thesis introduced the basic situation of the distribution network connected to the distributed photovoltaic,and then through the theoretical analysis of the principle of distributed photovoltaic effect on power distribution network,used the power flow calculation model to get the voltage change of distributed photovoltaic access to distribution network,and get the influence of distributed photovoltaic grid after analysis.Based on the impact of distributed photovoltaic on distribution network,this thesis designed a quantitative evaluation model of distributed photovoltaic access to distribution network.Firstly,this thesis designed the evaluation indexes of photovoltaic consumption rate,voltage fluctuation rate,voltage deviation,harmonic distortion rate and opposite tide quantity,and defined the weight of the five indexes by the combination weight method of comprehensive analytic hierarchy process and entropy weight method,and displayed the evaluation results and quantitative results through radar map and radar map area.Studying the impact and evaluation methods of distributed photovoltaic connected to the distribution network will help the power company better plan the installation scheme of distributed photovoltaic,and help the power company evaluate the areas where distributed photovoltaic has been installed.