考虑通信工况的主动配电网多层级协作电压控制方法

Hierarchically Coordinated Voltage Control Method for Active Distribution Networks Considering Communication Conditions

随着主动配电网的发展,通信工况对电压控制的影响更加显著。主站与光伏逆变器的通信中断会影响逆变器的无功出力调整,进而导致配电网电压越限。文中提出一种考虑通信工况的主动配电网多层级协作电压控制方法,其对配电网信息侧进行建模以描述控制过程的各轮信息交互,再通过协作集中层级与就地层级,实现了在不同通信工况下对各逆变器无功出力的合理调整。集中层级建立了考虑通信工况的逆变器下垂出力约束、配电网潮流约束以及考虑网络损耗和电压偏差的多目标函数,并对其构建的线性优化问题进行求解。就地层级根据逆变器通信状态来选用经集中层级决策的或提前预设的下垂参数。通过基于IEEE 118节点系统的仿真分析,验证了所提方法能在逆变器通信中断时段内保证配电网电压不越限,并能实现网络损耗与电压分布的全局优化。

With the development of active distribution networks,the impact of communication conditions on voltage control becomes more significant.The interruption in communication between the main station and photovoltaic inverters will affect the adjustment of inverter reactive power,resulting in voltage violations in the distribution network.This paper proposes a hierarchically coordinated voltage control method for active distribution networks considering the communication conditions which models the cyber side of the distribution network to describe the information interaction during the control process.Then,the reasonable adjustment of the reactive power output for each inverter in different communication conditions is realized through the coordination of the central and local hierarchies.The central hierarchy establishes the droop output constraint for inverters considering communication conditions,the power flow constraints of distribution networks,and the multi-objective function considering both network loss and voltage deviation,and the linear optimization problem is solved.The local hierarchy selects droop parameters decided by the centra hierarchy or pre-set based on the inverter communication conditions.By the simulation analysis on IEEE 118-bus system,it is verified that the proposed method can ensure that the voltage of the distribution network remains within the normal range during communication interruptions,while achieving the global optimization of network loss and voltage distribution.