电网输电线路耦合强度分配策略研究

On the Coupling Strength Distribution Strategy of Power Transmission Lines

为研究耦合强度分配策略对电力系统同步和稳定性的影响,探究提高电网性能的耦合强度分配方式,提出三种电网输电线路耦合强度分配策略(EQ,TP,LB)。EQ分配方式,各线路耦合强度均相等;TP分配方式,各线路耦合强度按系统等耦合强度同步运行状态下,线路传输功率的绝对值大小正比分配;LB分配方式,线路耦合强度按边介数大小正比分配。在K、IEEE、IEEE14、IEEE30标准测试网络、BA无标度网络、NW小世界网络上进行仿真实验,从电网的同步和稳定性两个方面比较三种输电线路耦合强度分配策略的优劣。研究表明,输电线路耦合强度按TP方式分配时,电网的同步和稳定性能皆为最佳;按LB方式分配时,电网的同步和稳定性能均为最差;按EQ方式分配时,电网的同步和稳定性能居中。

In order to study the influence of the coupling strength distribution strategy for syn-chronization and stability of power grids,to explore a coupling mode to improve the synchronizability and stability of power grids,this paper proposes three coupling strength distribution strategies of power transmission lines,which are named EQ,TP and LB.Respertively,the EQ strategy means that all the line coupling strengths are equal.The TP strategy means that the coupling strength of a line is proportional to its power distribution which value is the case that synchronization is achieved with the equal coupling.The LB strategy means that a line coupling strength is proportion to its link betweenness.Simulation experiment is carried out on IEEE14,IEEE30,IEEE39,IEEE57standard test net,as well as BA scale-free network and NW small-world network.The advantages and disadvantages of these three strategies are compared through synchronizability and stability of power grids.Study shows that the TP strategy is the best one,the LB strategy is the worst one among the three,the performance of the EQ strategy is in the middle.