考虑分布式新能源恢复动态特性的配电网拓扑重构方法

A Topology Reconfiguration Method for Distribution Networks Considering Dynamic Features of Distributed Renewable Energy Sources Restoration

  • 摘要: 在配电网故障恢复决策时如果忽略分布式新能源重新并网时的出力增长过程,可能造成恢复初期系统电压过低越限、新能源及负荷脱网,引发配网供电恢复失败。对此,提出一种计及分布式新能源恢复动态特性的配网供电恢复拓扑重构方法。首先,构建新能源配网故障恢复动态控制模型,提出恢复初期–后期双时间断面潮流计算方法,对配网重构方案进行全过程动态约束校验。然后,提出基于预方案初始化和高斯变异改进的阿奎拉鹰与粒子群组合优化算法,有效改善重构寻优算法的全局搜索能力和收敛性。经不同故障位置和多重故障算例验证,所提方法可在确保供电恢复全过程满足配网动态电压约束、避免新能源并网失败的前提下,搜寻恢复负荷最大化的故障恢复方案,保障高比例分布式新能源配网可靠恢复供电。

     

    Abstract: Ignoring the output increase of distributed renewable energy sources (dRESs) may lead to undervoltage exceeding limits in the initial period, dRESs and load off-grid, thereby resulting in failure of power supply recovery for the entire distribution network. In view of this, a restoration control method for the distribution network considering the dynamic characteristics of dRESs is proposed in this paper. Firstly, the dynamic restoration control model of a distribution network integrated with dRESs is constructed. In addition, a double time-section power flow calculation method is proposed to check the constraint conditions throughout the dynamic process of system restoration. Then, a combined optimization algorithm that integrates the Aquila Optimizer and the Binary Particle Swarm Optimization algorithm, which is improved through pre-scheme initialization and Gaussian mutation, is proposed. This algorithm can effectively enhance the global search capability and convergence of the reconstruction optimization algorithm. The examples demonstrate that the proposed method is capable of calculating the optimal reconstruction scheme for the dRESs-penetrated distribution network within dozens of seconds. Off-normal voltage and failure reconnection of dRESs can be avoided, thereby boosting the restoration of the distribution system.

     

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