A reactive voltage control strategy for distributed PV based on cluster segmentation

Abstract

In response to the voltage over-limit in distributed photovoltaic （PV） distribution networks， a reactive voltage control strategy considering cluster segmentation of distributed PV is proposed. Firstly， a modularity index based on reactive voltage sensitivity is introduced； taking account of the reactive balance and coupling within clusters， an improved modularity index is obtained and used for cluster segmentation. Then， a strategy for reactive voltage control within over-limit clusters and a coordinated control strategy between clusters are proposed. When overvoltage clusters cannot restore voltage to a safe level internally， the strategy involves selecting lead nodes from safe clusters with adjustable reactive power capacity to allocate the remaining adjustable reactive power capacity to the overvoltage clusters. Finally， simulations are conducted using an IEEE 33-bus distribution network to validate the effectiveness of the proposed strategy.

Keywords

• distributed pv
• cluster segmentation
• reactive voltage control
• improved modularity index
• cluster voltage control