交直流混合配电网结构优选和设备容量优化

Optimization of AC/DC Hybrid Distribution Network Structure and Equipment Capacity

交直流混合配电网是未来配电网的重要发展方向,该文基于供电能力对其结构和设备容量进行了优选优化。首先,分析了交直流混合配电网N-1故障下的负荷转供方式,并提出其供电能力的各类指标。然后以交流供电能力最大和直流供电能力最大为目标建立了多目标优化模型,对供电能力进行准确计算。进而提出了基于供电能力的结构优选和设备容量优化方法。最后通过算例分析发现交流和直流供电能力存在着近似线性的关系,并对比分析了不同结构配电网的供电能力,针对不同负荷场景,对系统结构和变电站内设备和交直流馈线容量进行了优选优化。通过该方法能够准确计算交直流混合配电网的供电能力,并在规划阶段指导电网结构和设备容量的选择。

The AC/DC hybrid distribution network is an important development direction of the future distribution network.Based on the power supply capability,this paper optimizes its structure and equipment capacity.Firstly,the load transfer mode under the N-1 fault of AC/DC hybrid distribution network was analyzed,and various indices of its power supply capacity were proposed.Then,a multi-objective optimization model was established with the goal of maximum AC power supply capability and maximum DC power supply capability,and the power supply capability was accurately calculated.Furthermore,a structure and equipment capacity optimization method based on power supply capability was proposed.Finally,through the analysis of the example,it is found that there is an approximate linear relationship between AC and DC power supply capability,and the power supply capability of different structure distribution networks was compared and analyzed.The system structure and equipment in the substation and the AC and DC feeder capacity were optimized for different load scenarios.Through the method of this paper,the power supply capacity of AC/DC hybrid distribution network can be accurately calculated,and the choice of grid structure and equipment capacity can be guided in the planning stage.