考虑集群划分的分布式光伏无功电压控制策略

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

针对含分布式光伏配电网的电压越限问题,提出一种考虑分布式光伏集群划分的无功电压控制策略。首先提出了基于无功电压灵敏度的模块度指标,考虑集群内的无功平衡度及耦合度,得到改进模块度指标并以此进行集群划分;然后提出越限集群内的无功电压控制策略与集群间的协调控制策略,当越限集群无法恢复集群内电压至安全水平时,通过主导节点选取具有可调无功容量的安全集群向越限集群分配剩余无功可调容量;最后以IEEE 33节点配电网系统为例进行仿真,验证了所提无功电压控制策略的有效性。

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 clus⁃ters,an improved modularity index is obtained and used for cluster segmentation.Then,a strategy for reactive volt⁃age control within over-limit clusters and a coordinated control strategy between clusters are proposed.When over⁃voltage 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.