Coordinated control of PVs in medium and high voltage distribution network based on voltage partitioning and pilot nodes selection

Abstract

High penetration of intermittent photovoltaic (PV) generation in medium and high voltage distribution network (DN) has caused uncertainty in power flow. Under this circumstance, great challenges have been put on reactive power control and voltage regulation in DN. In this paper, focusing on reactive power control of PVs and voltage regulation, a coordinated control of PVs in medium and high voltage DN is proposed based on voltage partitioning and pilot nodes selection. Firstly, three indices are introduced to evaluate performance of voltage partitioning, that is, redundancy rate of reactive power within a partition, strong coupling within a partition and weak coupling within partitions. Secondly, indices of observability and controllability are adapted to select pilot nodes. Then the control strategy of PVs in medium and high voltage DN is proposed according to results of voltage partitioning and pilot nodes selection. Case study results verified the feasibility and effectiveness of proposed control strategy.