Research on distributed photovoltaic access capacity based on electricity information collection

The application of distributed photovoltaic has been an important mean to solve crisis of oil supplies and environment protection pressure. With the large-scale access of distributed photovoltaic in distribution networks, operation stability of power grid, power quality and system protection are significantly affected. As a result, how to accurately assess regional power grid for the acceptance of distributed photovoltaic ability level has also become a research hotspot at this stage. The purpose of the paper is researching the method to establish a scheme of evaluation index system for photovoltaic access capacity. Firstly, technological development trends of distributed photovoltaic are analyzed. Secondly, a scheme of evaluation index system for photovoltaic access capacity is proposed by considering multiple dimensions such as transformer capacity, source-load matching degree, line loss, three-phase imbalance, and low voltage situation. At the same time, the method of flexible control based on energy controller is provided in this paper. Thirdly, are conducted in the city of Wuling with 1068 residential districts. According to the experimental results, it can be found that the total photovoltaic access capacity of Wuling is 119000 kVA.