单输电通道中输电断面静稳极限的快速估算  

A Fast Method to Estimate Steady-State Stability Limit of Tie Line in Single Power Transmission Channel

作　　者：张文朝[1] 何玉龙[2] 顾雪平[2] 张艳萍[1] 李岳 李佳[2] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]华北电力大学电气与电子工程学院,河北省保定市071003 [3]唐山电力公司,河北省唐山市063000

出　　处：《电网技术》2012年第5期92-95,共4页Power System Technology

摘　　要：为快速估算互联电力系统输电断面的静稳极限,应用短路电流计算等值阻抗,在此基础上提出了快速估算单输电通道静稳极限的方法。分别求取输电断面联络线两端母线的短路电流和短路容量,并据此将互联的大系统等值成为简单的两机系统。为考虑励磁影响,给出了等值系统机端电压修正方案。将修正后的等值系统机端电压和等值阻抗代入输电断面功率传输极限公式,即可得到输电断面静稳极限。算例结果验证了该方法的有效性。To fast estimate steady-state stability limit of tie lines in interconnected power grid, the equivalent impedance is calculated by short-circuit current, on this basis a method to fast estimate steady-state stability limit of single power transmission channel is proposed. The short-circuit currents of buses at both terminals of tie line and its short-circuit capacity are solved respectively, and based on them an interconnected large-scale power grid is equivalent to a simple two-machine system. To take the influence of excitation system, a modified scheme for terminal voltages of the equivalent system is given. Substituting the terminal voltages and equivalent impedance of modified equivalent system into the formula to calculate power transmission limit of tie line, the steady-state stability limit of the lie line can be obtained. The effectiveness of the proposed method is verified by calculation results.

关 键 词：输电断面 短路电流 静稳极限 机端电压 

分 类 号：TM72[电气工程—电力系统及自动化]