基于综合薄弱度的电网节点脆弱性评估

Node Vulnerability Assessment of Power Grids Based on Comprehensive Weak Degree

为辨识电网运行中的薄弱节点,给出了统筹考虑电网各元件负载率分布的均匀程度、系统负载率和损失负荷相对值的综合薄弱度辨识方法。利用IEEE39节点系统仿真,将所得结果与现有研究方法进行比较,验证了综合薄弱度指标的有效性。最后对甘肃750kV及330kV电压等级电网进行仿真计算,结果表明,基于综合薄弱度指标得到的薄弱节点能较好地反映节点在电网中的薄弱程度,并且符合甘肃电网的实际运行情况。以此作为参考,电网的运行及调度人员就可以对薄弱节点进行重点监控,提前制定防御措施,以提高系统的稳定性。

In order to identify weak nodes in power grid, a comprehensive weak degree identification method that con- siders loading rate distribution uniformity of each component of power grid, system loading rate and load loss relative val- ue is given in this paper. Taking IEEE 39-bus system as a simulation example, the results verify the validity of the comprehensive weak degree index in comparison with the existing research methods. In the end, through applying this method to 750kV and 330kV Gansu power grid, the results show that the comprehensive weak degree index can find weak nodes well, which is close to the actual operation char- acteristics of Gansu power grid. On this basis, the operation and dispatching personnel of the power grid can focus on monitoring weak nodes, and put forward corresponding de- fensive measures to improve the reliability of the system.