计及功率裕度的FDN模糊下垂控制策略研究

传统下垂控制按照固定下垂系数分配不平衡功率,未能兼顾功率合理分配和直流电压稳定。针对这一问题,提出了一种基于模糊规则的下垂控制策略,该策略根据电压偏差和功率裕度实时优化更新下垂系数,通过在各馈线之间快速、合理地分配不平衡功率维持直流电压稳定,并保证传输功率在换流器功率裕度内。最后,以柔性配电网中的负荷投切和光伏波动为算例,在PSCAD仿真软件中对所提控制策略进行了验证,仿真结果表明所提控制方法能使换流器在功率裕度内快速分配不平衡功率,提高直流电压偏差精度,降低换流器容量过载风险。

Research on FDN Fuzzy Droop Control Strategy Considering Power Margin

Traditional droop control distributes unbalanced power according to fixed droop coefficient,and it failures to balance reasonable power distribution and DC voltage stability.To solve this problem,this paper proposes a droop control strategy based on fuzzy rules.This strategy optimizes and updates the droop coefficient in real time according to the voltage deviation and power margin,maintaining DC voltage stability by quickly and reasonably distributing unbalanced power between feeders,and ensuring that the transmitted power is within the converter power margin.Finally,this paper takes the load switching and photovoltaic fluctuations in the flexible distribution network as an example and the proposed control strategy is verified by PSCAD simulation software.The simulation results show that the proposed control method can enable the converter to quickly allocate unbalanced power within the power margin,improve the accuracy of DC voltage deviation and reduce the risk of inverter capacity overload.