城市配电网DG消纳能力曲线的计算方法与分析应用

Calculation method and analysis application of DG total accommodation capability curve for urban distribution network

为了完整描述城市配电网的分布式发电(DG)消纳能力(TAC),探究DG TAC曲线的提升措施,提出一种城市配电网DG TAC曲线的计算方法。介绍安全域和安全边界;建立考虑馈线负荷实际情况和电压约束的TAC曲线模型,该模型利用日负荷曲线确定状态空间,通过对边界点进行电压校验得到TAC曲线。算例验证了所提方法的有效性。通过分析TAC曲线的负荷影响因素发现,只有瓶颈馈线段(组)下游负荷对TAC曲线有影响,提出增加瓶颈馈线段(组)下游负荷和瓶颈馈线段(组)扩容2种TAC曲线提升措施。提出TAC曲线在指导DG和负荷接入、导线更换方面的应用方法。

In order to completely describe the distributed generation(DG)accommodation capability of urban distribution network and explore the improvement measures of DG total accommodation capability(TAC)curve,a calculation method of DG TAC curve of urban distribution network is proposed.The security region and security boundary are introduced.A TAC curve model considering actual situation of feeder load and voltage constraints is established,which uses the daily load curve to determine the state space,and obtains TAC curve through voltage verification of boundary points.A case verifies the effectiveness of the proposed method.By analyzing the load influen-cing factors of TAC curve,it is found that TAC curve is only influenced by the downstream load of bottleneck feeder section(group),and two TAC curve improvement measures of increasing the downstream load of bottleneck feeder section(group)and expanding the capacity of bottle⁃neck feeder section(group)are proposed.The application methods of TAC curve in the aspects of guiding DG and load connection and conductor replacement are proposed.