交叉跨越两回输电线路故障的等值机电暂态仿真方法

Equivalent Electromechanical Transient Simulation Method for the Fault of Two Crossing Transmission Lines

随着电网规模的不断扩大,输电走廊资源愈加紧张,交叉跨越两回输电线路发生故障的可能性日益剧增,本文提出了针对这种故障的机电暂态仿真方法,首先对故障的序网电压方程和故障边界条件方程进行消元处理,得到故障点的正序附加阻抗矩阵并把正序附加阻抗矩阵进行对称化;然后把故障点正序附加导纳矩阵扩展到故障线路各端点,根据故障线路各端点的正序附加导纳矩阵生成对应的暂态数据卡,从而提出了交叉跨线两回输电线路故障的等值机电暂态仿真方法。最后采用实际电网数据,对交叉跨越两回输电线路故障和交叉跨越线路接地故障进行机电暂态仿真,根据仿真结果对比,验证了所提方法的正确性。

With the expansion of power grid scale, transimission corridor resources become more and more scarce, the possibility of fault occurrence for two crossing transmission lines is intensively increasing. This paper presents a new electromechanical transient sim- ulation method for this kind of fault. Firstly, elimination processing are carried out for both the faulty order network voltage equation and the boundary condition equation in order to obtain additional positive sequence impedance matrix of fault node, and the matrix is processed symmetrically. Then the additional positive sequence impedance matrix of fault node is extended to faulty line nodes. Ac- cording to the additional positive sequence impedance matrix of faulty line nodes, corresponding transient data card is generated and e- lectromechanical transient simulation method for two crossing transmission lines is proposed. Finally, by using the data of an actual power grid, electromechanical transient simulation is carded out for the fault of two crossing transmission line and ground fault of two crossing transmission line. The simulation results verify the correctness of the proposed method.