Research on the Influence of Distributed Photovoltaic Grid-Connection on the Operation Characteristics of Distribution Transformer

When distributed photovoltaic systems are integrated into the distribution network, they alter the load characteristics of traditional distribution networks and introduce the characteristics of bidirectional flow. In order to develop the construction and configuration scheme of distribution transformer in active distribution network, firstly, it is necessary to assess how distributed photovoltaic grid connection affects the operational characteristics of distribution transformers by analyzing its impact mechanism. In order to quantify its influence on distribution transformer, a set of probability-based assessment indexes is proposed. On this basis, based on the probability assessment index, the variation of voltage on the low voltage side is studied in this paper, load rate and loss of distribution transformer under different distributed photovoltaic permeability.