A resilience enhancement strategy based on subnetting is proposed to improve the robustness and repair ability of multi-source power grids. Firstly, based on the characteristics of renewable energy and the principle of cascading failure, the network is divided into multiple stable and sustainable subnets by using the power flow data and island operation conditions in the system, and the key nodes in the subnet are identified by the index of interval electrical betweenness. Considering the three stages of the resilience cycle, the nodes that should be protected or repaired are determined at each time scale, and four different attack and repair strategies are established on this basis. To verify the effectiveness of the proposed method, the robustness and resilience of power networks with and without renewable energy are evaluated from different perspectives, and the impact of this method on improving network resilience is quantitatively evaluated. Finally, the improved IEEE 118-bus system is simulated. The results show that the attack and repair strategies based on subnetting have significant effects on both multi-source power grids and traditional power grids. The resilience enhancement method proposed in this paper can identify grid weaknesses and formulate repair measures that can provide support for improving the defense and resilience of the power grid.

为了提高多源电网的鲁棒性和修复能力，提出了一种基于子网划分的弹性增强策略。首先，基于可再生能源的特点和级联故障原理，利用系统中的潮流数据和孤岛运行情况，将网络划分为多个稳定可持续的子网，子网中的关键节点识别为区间电介数指数. 考虑到弹性周期的三个阶段，在每个时间尺度上确定应该保护或修复的节点，并在此基础上建立四种不同的攻击和修复策略。为了验证所提方法的有效性，从不同角度评估有无可再生能源的电网的鲁棒性和弹性，并定量评估了该方法对提高网络弹性的影响。最后对改进后的IEEE 118总线系统进行了仿真。结果表明，基于子网划分的攻击修复策略对多源电网和传统电网均有显着效果。