分级骨干网架的构建及其经济效益评估方法

构建骨干网架是差异化规划电网以提高其抵抗自然灾害能力的关键手段,基于设备重要度和抗灾效益评估的阶梯式分级骨干网架建设能够兼顾电网建设的抗灾性和经济性。本文根据系统源、荷和支路的重要度评估,提出了分级骨干网架构建方法,以全寿命周期成本理论为基础并考虑设备等级、使用寿命和折旧价值,构建差异化建设投资成本计算模型,以各级负荷典型用户为代表建立负荷侧停电损失模型并与发电侧和电网侧效益组成分级骨干网架抗灾效益,结合成本模型形成差异化建设经济效益评估体系。最后以IEEE 118系统为例搜索分级骨干网架并设计多种抗灾建设方案,通过投资成本和收益的对比,证明了分级骨干网架建设的经济性和抗灾效益评估体系的合理性与可行性。

Construction of graded backbone grid and its economic assessment

Identifying backbone grid is of great significance to the differential planning of power grid in that it can improve the resistance to natural disasters effectively. The stepwise graded backbone grid based on the evaluation of both equipment importance and the benefit of disaster resistance can balance disaster resistance and economy of power grid construction. This paper presents an approach to construct graded backbone according to the classification of power sources, loads and branches. Based on the life cycle cost theory, the cost calculation model of the differential construction is established with the grade of equipment, service life and depreciation value taken into account. The model of customer outage cost is set up with typical users as representatives, which, together with the benefits of power-generation-side and transmission-side and the cost calculation model, constitutes a set of economic assessment system. The feasibility of the method to search for graded backbone grid and the validity of the proposed assessment system are verified by simulation results of the IEEE 118-bus power system.