融合对称分量法与相分量法的大规模电力系统跨线故障计算

针对电力系统中平行线路的跨线故障,提出一种融合对称分量法与相分量法的大规模电力系统跨线故障计算方法。首先形成跨线故障时平行线路准确的对称分量导纳矩阵,建立跨线故障接口电路统一相分量模型,再利用相分量法与对称分量法对故障端口与对称系统分别进行求解。该算法充分发挥了对称分量法和相分量法的各自优势,适合处理大规模电力系统的任何类型跨线故障,方便与传统的基于对称分量法的故障计算软件接口,易于编程实现。所研制的综合故障计算软件已用于实际电网的跨线故障计算,通过与EMTP的仿真结果对比证实了算法的正确性。

Inter-Line Fault Calculation Using Integrated Symmetry-Component and Phase-Component Method for Large Scale Power System

A calculation approach using integrated symmetry-component and phase-component methods is presented in this paper in order to meet the requirements of the calculation of inter-line faults, which occur on parallel transmission lines of large scale power systems. This procedure mainly includes: constructing the nodal admittance matrices of the parallel lines with 3-sequence components, deducing the universal nodal admittance-matrix model of the fault circuit in phase coordinates, solving the nodal voltage of the faulted port and the rest network by using phase-component method and the classical symmetrical components based fault calculation method respectively. The method allows the calculation of any inter-line fault conditions. It is convenient for the interface with the the symmetrical components based fault-calculation-software, and easy to program. Furthermore, the software is developed and put into service in real power grid to calculate the inter-line faults. The simulation results with EMTP show that it is correct.