基于参数辨识的SCOTT变压器保护

Research on SCOTT Transformer Protection Based on Parameter Identification

牵引变压器电流差动保护的核心问题是励磁涌流和内部故障电流的识别,而目前的识别方法存在误动作的可能性,为此提出了一种用系统辨识理论作为变压器保护的新方法,并建立了三相—两相SCOTT牵引变压器保护的电气模型,依此为基础结合辨识理论提出了基于参数辨识的三相—两相SCOTT牵引变压器保护原理,通过仿真计算验证了该方法的可行性和有效性。结果表明参数辨识方法能有效区分牵引变压器内部故障与外部故障、励磁涌流等情况。研究结果有助于变压器差动保护制动策略的制定,可供变压器差动保护装置的开发借鉴。

In accordance with the inrush current identification and internal fault conditions of transformer protection, a modern control theory for the electrical power system is put forward. Basing on differential protection, the discrim-ination method SCOTT traction transformer is focused on. Based on a linear equation, a novel protective principle according to identification of winding parameter is presented, and its operation characteristic and operation equation are proposed. Simulation results by using a software demonstrate the feasibility and availability. These results about the influence on the performance of differential protection are useful to the design of protection scheme and setting of the threshold.