含可再生能源的电力系统两阶段核心骨干网架优化策略

可再生能源是全球能源转型和低碳发展的重要解决方案,含高比例可再生能源是未来电力系统发展的必然趋势,而高比例可再生能源电力系统的核心骨干网架直接关系到系统在灾害条件下的生存性、可靠性和可再生能源的消纳率。分析了高比例可再生能源电力系统的核心骨干网架的特征。随后结合电力网络中不同类型节点的特点,基于拓扑特性和电气参数分别构建各类节点的重要度评价指标体系,并采用熵权-理想解法评价各类节点的相对重要度。根据节点的相对重要度,构建了两阶段核心骨干网架优化模型:第一阶段模型针对重要负荷节点进行网架优化;第二阶段模型针对电源节点进行优化,最终得到包含风电场、光伏电站和常规机组的核心骨干网架。修改后的含高比例可再生能源的IEEE-118节点系统的仿真结果表明,文中策略能够较全面地评估高比例可再生能源电力系统的各类节点的相对重要度,优化得到的核心骨干网架能够保障对重要负荷的供电,且具有较高的可再生能源渗透率与利用率。

Two-stage Core Backbone Network Optimization Strategy for Power Systems With Renewable Energy

Renewable energy is an important solution for global energy transformation and low carbon development. Interfacing with high proportion of renewable energy is an inevitable trend of future power systems. Core backbone network directly correlates to survivability, reliability and accommodation rate of renewable energy of power systems with high proportion of renewable energy. The characteristics of the core backbone network are analyzed based on the characteristics and operation requirements of power systems with high proportion of renewable energy. According to the characteristics of different types of nodes in power networks, the node importance evaluation indexes are presented respectively, and relative importance of each type of nodes is evaluated with entropy weight and technique for order preference by similarity to ideal solution method. Based on the relative importance of nodes, a two-stage core backbone network optimization model is proposed. The first stage of the model aims at optimizing critical load nodes;while the second stage aims at optimizing power source nodes, and then a core backbone network with wind farms, photovoltaic plants and conventional units is attained. Simulation results of the modified IEEE-118 bus system with high proportion of renewable energy show that the proposed strategy can comprehensively evaluate the relative importance of various types of nodes of power systems with high proportion of renewable energy and that the optimized core backbone network guarantees the power supply to critical loads and has ahigh penetration and utilization of renewable energy.