在线短路电流计算精确等效模型研究

A Study on Accurate Equivalent Model of Short Circuit Current Calculation

通过比较现行不同短路电流计算方法假设条件的异同和误差,提出了一种适用于在线短路电流计算的精确等效模型,包括发电机模型、变压器模型、负荷模型、线路及互感模型,比传统短路电流计算模型提高了精确度。通过算例验证了在线短路电流计算精确等效模型的可行性,为调度员在线短路电流计算提供参考,对于故障情况下快速处理短路电流超标的地区具有指导意义。

In this paper,the authors compare the differences and errors of the different methods for short-circuit current calculation which are being used at present,and propose an accurate equivalent model which is suitable for the on-line short-circuit current calculation,covering the generator model,transformer model,load model,line model and mutual inductance model. Compared with the traditional short-circuit current calculation model,this proposed model can significantly imp-rove the calculation accuracy. The feasibility of the model is validated by a numerical example,suggesting that the model has certain reference value for dispatchers for the on-line short-circuit current calculation and it is of significance to rapidly process the short-circuit over-current.