Abstract: The large-scale access of distributed generation (DG) has brought serious challenges to the protection and self-healing of medium-voltage distribution networks. To solve this problem, it is first necessary to determine the specific access location and capacity of distributed generation in active distribution networks. Based on Kirchhoff’s current law, this paper firstly introduces the current relation between switchgear current and medium-voltage distributed photovoltaics and distribution transformers in medium-voltage active distribution network. Aiming at the function of voltage acquisition is not put into the distribution switchgear in some areas at present, which it is not possible to telemetry the direction of the current, established a mathematical model of topology identification of active distribution network and proposed an improved Newton’s iteration method to solve the topology recognition model. Then, the identification of the correlation relationship between photovoltaics, and the on-off feed switch is realized, and the effectiveness of the proposed model and algorithm is verified by simulation examples.

    Key words: active distribution network; telemetry data; topology identification; Newton’s iteration method; distributed generation; switchgear