随着高渗透率分布式光伏的接入,配电网的过电压问题愈发严重,传统集中式的电压优化控制方法因为变量维数过多而无法满足控制时间的要求。基于此,该文提出一种主动配电网电压分区协调优化控制的方法。首先提出无功/有功分区质量函数作为分区指标,并以网络快速分区算法对配电网进行无功、有功分区。在无功分区内,以无功调节量最少为目标建立光伏逆变器无功优化二阶锥模型,在有功分区内,以光伏有功剪切最少为目标建立光伏逆变器有功剪切二阶锥优化模型,采用并行计算方式对各分区内二阶锥优化模型同时求解,然后将各分区优化结果作为其他分区优化约束再进行迭代优化,直至所有分区内目标函数值不再发生变化,达到各分区之间协调控制的目的。最后以某实际馈线系统为例,验证所提方法能对配电网过电压进行快速有效的控制。
Abstract
The higher the penetration level of PVs in distribution networks, the greater the overvoltage issues would be. Due to the extremely high dimension of control variables, the traditional centralized control methods are getting too complex, which would barely satisfy the operational requirements of future active distribution networks. In order to address this crucial issue, this paper presents a voltage control method based on a network partitioning technique. A community detection algorithm based on a reactive/active quality function is introduced to divide a distribution network into reactive/active power sub-networks. For the reactive power sub-networks, a second-order cone programming （SOCP） based model for PV inverters is established with the objective of minimizing the regulated reactive power. For the active power sub-networks, a SOCP based model is also proposed for PV inverters with the objective of minimizing the curtailed active power of PVs. The proposed models in each sub-networks are solved by a parallel way. After the optimization, the results of the optimization are exchanged among each sub-network, and the constraints in each sub-network are then updated accordingly. A new optimization process is then started until the stopping criterion is met. Finally, an actual feeder is employed to verify the feasibility and effectiveness of the proposed approach.
关键词
分布式光伏 /
配电网 /
高渗透率 /
电压调节 /
网络分区
Key words
distribution photovoltaic /
distribution network /
high penetration /
voltage reyulation /
network partition
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基金
国网山东省科技项目（52062518000P）
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