考虑电压等级和运行状态的电网脆弱线路辨识

发布时间：2019-08-09 11:11

【摘要】：城市电网中存在的某些脆弱环节对城市电网大规模停电和系统失稳的发生有重要的影响。考虑电网实时运行状态,引入衡量潮流分布不均衡程度的潮流熵概念,提出将线路潮流熵变化作为脆弱线路辨识的一个指标。基于复杂网络理论,考虑电网拓扑结构特点,建立节点重要度指标;并结合线路所在电压等级和地理位置,提出脆弱度修正因子。通过综合潮流熵变化、节点电压偏移、节点重要度和修正因子提出城市电网脆弱线路辨识的方法。以长沙城市电网2011年夏大运行方式为例进行线路脆弱性分析,并进行时域仿真验证。仿真结果表明,所提方法能较好地辨识城市电网中的脆弱线路,并与电网实际运行情况相吻合,特别是能够辨识出承担功率不多但是重要的联络线路。通过对IEEE 39节点系统脆弱线路的辨识,证明了所提方法的合理性和通用性。
[Abstract]:Some fragile links in urban power grid have an important impact on the occurrence of large-scale power outages and system instability in urban power grid. Considering the real-time operation state of power grid, the concept of power flow entropy, which measures the degree of imbalance of power flow distribution, is introduced, and the change of line power flow entropy is proposed as an index of fragile line identification. Based on the complex network theory, considering the characteristics of power network topology, the node importance index is established, and the vulnerability correction factor is proposed according to the voltage level and geographical position of the line. Through the combination of power flow entropy change, node voltage offset, node importance and correction factors, a method for identification of fragile lines in urban power grid is proposed. Taking the operation mode of Changsha Urban Power Grid in summer 2011 as an example, the line vulnerability is analyzed and verified by time domain simulation. The simulation results show that the proposed method can identify the fragile lines in the urban power grid and is in good agreement with the actual operation of the power grid, especially the important contact lines with little power. Through the identification of fragile lines in IEEE 39 bus system, the rationality and generality of the proposed method are proved.
【作者单位】：湖南大学电气与信息工程学院;
【基金】：国家科技支撑计划项目(2013BAA01B01) 国家自然科学基金重点项目(51137003,61233008)~~
【分类号】：TM732

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