复杂电网级联事故下的重要线路辨识

Identification of Important Lines under Complex Grid Cascading Accidents

摘要:

实现电网级联事故中的关键输电线路准确辨识，对大范围的电力供应中断事故的预防及控制有着重要意义。首先运用能量函数，结合直接法的建模思路，将事故过程中的潮流转移、电压波动等诸多复杂电气量变化统一至能量函数框架内，准确量化线路之间的能量关联关系，构造出适用于级联事故分析的复杂网络模型；之后，在PTDF网络能力的启发下，以上述复杂网络模型为执行环境，提出线路能量流量的概念，用于评估网络线路在级联事故发生过程中的关键程度；最后，通过改进OPA模型在IEEE-39节点系统进行级联事故仿真，并求取Pearson相关系数，验证了线路重要度指标的有效性。为电网安全运行和稳定性控制控制提出合理化建议

关键词:能量函数;级联事故;线路能量流量;改进OPA模型

Abstract:

Accurate identification of key transmission lines in power grid cascading accidents is of great significance for the prevention and control of large-scale power supply interruption accidents. Firstly, using the energy function and combined with the modeling method of direct method, the changes of complex electric quantities such as power flow transfer and voltage fluctuation in the accident process are unified into the framework of energy function, and the energy correlation relationship between the lines is accurately quantified. The complex network model of cascading accident analysis is constrcuted, and then, inspired by the PTDF network capability, the above-mentioned complex network model is used as the execution environment, and the concept of line energy flow is proposed to evaluate the critical degree of network lines in the process of cascading accidents. Finally, the improved OPA model is used to simulate the cascading accident in the IEEE-39 node system, and the Pearson correlation coefficient is obtained to verify the validity of the line importance index, which provides reasonable suggestions for security operation and stability control of power grid.

Key words:energy function; cascading accident; line energy flow; improved OPA model