短路电流仿真值与录波值的比对分析

对电网某短路故障进行仿真计算,再与实际录渡比对,结果基本吻合,存在少量误差.误差由录渡取值误差和仿真计算误差共同组成,录波取值的误差包括电流互感器误差、保护(故障录波仪)录渡误差、有效值计算误差,仿真计算误差包括不能完全真实再现电网运行方式以及电网元件仿真参数误差.因此,在短路电流计算中,选择好基于潮流还是不基于潮流,并且控制好诸如零序互感、低压小机组、负荷模型等短路计算的影响因素,可以将短路电流计算值与实测值的误差控制在5%以内,说明目前采用的常规短路电流计算方法是可取的.

Comparison between simulative and recorded data of short-circuit current

The simulative results and the actual recorded data of a short-circuit fault in power grid are compared.It shows that,they are matched well with small error,which consists of the wave recording error and the simulative calculation error.The former includes CT error,relay protection(fault recorder) error and virtual value calculation error.The latter includes operation mode simulation error and element parameter errors.The proper control of influencing factors,such as calculation method(based on power flow o...