基于最大供电能力的配电网规划理念与方法

TSC-based Planning Idea and Method for Distribution Networks

为充分发挥配电网效率,提出基于最大供电能力(totalsupply capability,TSC)的配电网规划理念方法。首先,给出TSC规划流程:1)计算TSC和可扩展的最大供电能力;2)负荷与TSC匹配的总量校验与优化调整;3)负荷与TSC匹配的分布校验与优化调整;4)N1校验验证。其次,将常见的配电网建设改造手段按代价从低到高归纳为3大类10种规划措施,并给出这些措施在TSC规划流程中何时采用。其中,负荷分布调整是TSC规划的首选措施,能通过调整负荷在主变和馈线间的分配消纳新增负荷,为此提出一种负荷再分配的优化方法。最后,通过算例演示TSC规划的过程,并与传统规划对比。基于TSC的规划与传统规划先考虑变电容量匹配再进行网络规划的思路不同,其理念是优先通过优化配电网结构及运行方式提升TSC满足负荷,其次再考虑新增变电容量,从而达到充分利用已有网络销纳新增负荷目的,适合目前城市建成区复杂配电网络的规划。

This paper proposed a new planning idea and method for distribution networks based on total supply capability （TSC）, which resulted in full utilization and higher efficiency of exist assets. Firstly, TSC-based planning method was composed of following steps： 1） The TSC and maximum supply capability （MSC） were calculated. 2） The TSC and MSC were used to verify whether they could match the need of the total load forecasted. It was necessary to exploit more TSC by reinforce the network but not to build new substations, when the load was greater than TSC and less than MSC. 3） This verification between load and TSC were also performed distributed, i.e. transformer by transformer. 4） N- 1 simulation was finally used to verify the selected planning scheme. Secondly, 10 planning measures were summarized in 3 types with their priorities, which were applied in the proposed planning steps to adjust the network and load distribution. Moreover, as to solve the load re-distribution problem, a model was set up, which was capable to search the optimized load distribution scheme considering the N- 1 security constraints. Finally, a planning case was discussed to show the difference from traditional approach. TSC-based planning differs from traditional planning approach in the idea that to exploit TSC from optimizing exist networks has higher priority than to increase substation capacity. This idea is suitable for short-term planning for urban developed distribution networks：