光伏高渗透率配电网中三电平电能路由器无功支撑技术研究

Research on Reactive Power Support Technology of Three-Level Power Router in Distribution Grid with High Penetration of Photovoltaics

光伏渗透率越高,配电网电压就越难以保持稳定,且会影响客户侧电能质量。文章针对光伏高渗透率配电网中的三电平电能路由器进行研究,该电能路由器由前端整流器、直流母线、后端逆变器3部分组成,DC-DC直流变换器可直接连到直流母线上。详细介绍了网侧变换器的拓扑结构与控制策略,针对设备的无功支撑能力进行了一系列仿真验证,证实该设备能够向配电网提供无功补偿以稳定电压波动。

As the penetration rate of photovoltaics increases,maintaining stable distribution grid voltages becomes more challenging,and it can also affect the power quality on the user side.This paper focuses on the study of a threelevel power router in distribution grids with high photovoltaic penetration.The power router consists of three main components:a front-end rectifier,a DC busbar,and a back-end inverter,with the DC-DC converter directly connected to the DC busbar.The paper provides a detailed introduction to the topological structure and control strategy of the gridside converter,and a series of simulation validations have been conducted to assess the device's reactive power support capability.The results confirm that the device can provide reactive power compensation to stabilize voltage fluctuations in the distribution grid.