线路综合故障电磁暂态建模与仿真

Electromagnetic Transient Modeling and Simulation for Line Integrated Fault

采用电磁暂态建模原理,利用时域仿真算法,建立了线路综合故障模型。该模型能够实现短路故障、断线故障、断线加短路故障、发展性故障的统一模拟。采用阻尼梯形法推导的电磁暂态方程。能够避免故障时的数值振荡问题。建立的等效断线故障电磁暂态模型在考虑对地电容影响的情况下,利用节点收缩原理消除了断口节点,较增加断口节点方法大幅降低了计算量,且比串联高阻抗方法仿真结果更加合理。同时,提出了断线故障下短路以及短路下断线的模型处理方法。仿真结果表明,所建模型可用干线路复杂故障情况下的电磁暂态过程研究,是线路故障下保护动作行为分析的有效手段。

By using the electromagnetic transient modeling principle and time domain calculation algorithm, the comprehensive fault line models are established, which can realize unified simulation, including short circuit fault, open-conductor fault, open-conductor fault and short circuit fault, developing fault. The electromagnetic transient equations are deduced by the damping trapezoidal method in order to avoid the numerical oscillation failure. Considering the influence of the capacitance to earth, with the node contraction principle, the broken gap is eliminated, the equivalent fault of electromagnetic model is established on the basis of the original node port with higher precision than the method of phased high impedance method, but no increase in network computing nodes. The model can be used to study the fault transient process of line complex fault condition, and is the effective means of protection action analysis.