发电机电磁过程对带孤立负荷运行的水电站过渡过程的影响

在水电站引水发电系统过渡过程研究中,一阶发电机模型未能反映电磁过程的影响,而三阶和五阶模型中计入电磁过程,能更好地模拟引水发电系统的过渡过程.在建立水力、机械、电气系统联合仿真模型的基础上,研究分析了使用一阶、三阶、五阶发电机模型时电站的小波动过渡过程.结果表明:使用一阶发电机模型的过渡过程与三阶、五阶模型的结果有较大差别,三阶模型与五阶模型的结果十分接近,即在水电站过渡过程中应考虑电磁影响.在长引水式水电站过渡过程中,一阶模型与三阶模型的差别更大.

Effects of generator electromagnetic processes on transient process of hydropower station with islanoled load

In the study of the transient process of hydropower stations,the first-order generator model which ignores the effects of electromagnetic process is widely used.The simulations of the transient process using third-order model and fifth-order model are better as they contain the electromagnetic process.Based on the united numerical models of hydraulic,mechanical and electrical system,the small fluctuations of the transient process is studied by using different generator models.The dynamic processes using first-order generator model and third-order,fifth-order model are quite different;while the dynamic processes of third-order model and fifth-order model are similar.So,the generator electromagnetic effects should be taken into account in the simulation of transient process.Particularly,in the condition of the hydropower stations with long diversion penstocks,the difference between the dynamic processes using first-order model and third-order model are greater.