A Network Partition-based Method for Voltage Control in Distribution Networks with Distributed PV

With a large number of distributed photovoltaic (PV) systems being integrated into distribution networks, there are increasingly serious voltage issues. Partition voltage control combines the advantages of centralized voltage control and local voltage control, so it has a good application prospect. However, due to the randomness and fluctuation of PV output, it is hard to form a stable network partition for voltage control. In view of this, this paper proposes a method for partition voltage control based on AP clustering. The discrete probability distribution is considered to deal with the PV output, and the electrical distance expectation matrix of nodes is established as the partition basis. AP clustering is used to partition all nodes except slack bus. For the voltage control of each cluster/region, an optimal reactive power control strategy based on the voltage control capability of PV inverter is proposed. Case studies on the modified IEEE 33-node system are carried out to verify the feasibility and effectiveness of the proposed method.