针对高渗透率分布式光伏配电网,因直接改变配电网的物理结构而导致母线电压波动严重,甚至发生电压越限问题,提出一种基于分布式可重构模型预测控制的分布式光伏配电网电压调节控制策略。首先,相互耦合电站之间交换各自参考轨迹,将邻居的状态也纳入自身的优化问题之中。然后,光伏电站因检修或恶劣天气影响需改变物理拓扑,设计3种不同的重构策略,保证电压能稳定在一定范围内。同时设计切换条件,判断要移出或移入的电站是否满足条件,不满足条件时求解对应的控制策略,更新参考轨迹,待满足条件时改变拓扑结构。最后,在Matlab/Matpower中进行仿真,验证所提模型和算法可有效降低配电网重构时的电压波动,提升电能质量。
Abstract
In distribution networks with high penetration of distributed photovoltaic sources, significant bus voltage fluctuations and even voltage overruns can result from direct alterations in the network’s physical structure. A voltage regulation control strategy for distribution network based on distributed reconfigurable model predictive control is proposed to solve this problem. The power stations incorporate the states of their neighbors into their own optimization problems by exchanging their reference trajectories with each other. Moreover, three distinct reconfiguration strategies are devised to adapt to changes in physical network topology stemming from maintenance or adverse weather conditions, ensuring stable node voltages. Concurrently, switching conditions are formulated to determine the feasibility of power station reconfiguration. Should reconfiguration not be viable, the corresponding control strategy is computed, reference trajectories are updated, and topology adjustments can be made only if the conditions are met. Finally, simulations are conducted using Matlab/Matpower to verify the effectiveness of the proposed model and algorithms in reducing voltage fluctuations and enhancing power quality during distribution network reconfiguration.
关键词
分布式光伏 /
配电网 /
高渗透率 /
电压控制 /
分布式可重构模型预测控制
Key words
distributed photovoltaic /
distribution network /
high penetration /
voltage regulation /
distributed reconfigurable model predictive control
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