基于输电线分布参数模型的电流差动保护新算法

Current Differential Protection Algorithm Based on Transmission Line Distributed Parameter Model

在双端线路电流差动保护研究成果基础上,建立了分布参数线路与输电线上电流电压微分方程组,提出了一种基于线路分布参数模型的纵差保护新算法。与传统的分相电流差动保护相比,新算法不受线路分布参数的影响,不再需要电容电流补偿,同时避免了简化线路模型给保护带来的误差,适合智能电网的特高压长线路发展需求,仿真结果表明新算法的可行性和正确性。

On the basis of current research on dual-side line current differential protection,this paper has established the differential equations between the distributed parameter line and power line current and voltage,and presented a new longitudinal differential protection algorithm based on line distributed parameter model.Compared with traditional differential current protection,the new algorithm can not be affected by line distributed parameter and has no more need for capacitance current compensation.Meanwhile,the new algorithm can help to avoid the error caused by simplified line model,and meet the development requirement of extra-high voltage long line in smart grid.Simulation results prove the feasibility and accuracy of the new algorithm.