不同短路故障下电力系统发电机参数的可辨识性研究

Power System Generator Parameter Identification under Different Short Circuit Faults

针对电力系统中发电机参数辨识,在不同的短路故障下,即单相短路、两相间短路、两相接地短路、三相短路,分析其参数的可辨识性。针对不同阶次的Park模型,采用基于轨迹灵敏度的可辨识性分析方法,采用5种不同的观测变量进行对比研究,即发电机相对功角、发电机端口电压相对相角、联络线有功功率、联络线无功功率以及枢纽母线电压。介绍了对比结果。

This paper compares four different short circuit faults for the generator parameter identification,i.e.singlephase short circuit,two-phase short circuit,two-phase grounding short circuit and three-phase short circuit.In accordance with different Park models,the identifiability analysis method based on the trajectory sensitivity is used for the comparative study by applying five observed variables for the generator parameter identification,i.e.the generator relative power angle,the relative phase angle of generator port voltage,the active powers through the tie-lines,the reactive powers through the tie-lines and the voltages at the key buses.The comparative results are introduced.