【摘要】 针对水轮发电机在稳态运行时的阻尼绕组电流谐波问题,采用场路耦合法,建立用于计算阻尼绕组电流的水轮发电机数学模型,并通过试验对该模型进行验证。以此为基础,分别计算几种不同稳态运行工况下的阻尼绕组电流及其谐波,包括电机空载运行、额定对称负载运行以及电机稳态负序运行等工况。分别研究发电机内主磁场、电枢绕组正序磁场和负序磁场对阻尼绕组电流谐波所产生的影响。此外还对阻尼绕组电流内的各次谐波分布特点以及产生机理进行了分析。对水轮发电机阻尼绕组电流谐波的研究,有助于预测阻尼条的受力情况,从而避免水轮发电机由于阻尼条振动强烈而出现断条事故。更多还原

【Abstract】 For the purpose of analyzing the harmonics of currents in damper windings of the hydro generator operated in static state,a mathematical model,which is proved to be reliable by the test,was built to calculate the damper winding current by field-circuit coupling method. And then,aiming at several steady-state operating conditions,including no-load operation,rated symmetrical load operation and steady state negative sequence load operation,the damper winding currents influenced by the excited field,the positive sequence field and the negative sequence field were analyzed respectively. Meantime the harmonics of the damper winding current was analyzed in detail,and the different harmonics influenced by different fields in the generator mentioned above was discussed. The research on the harmonics of the damper winding currents could contribute to predict the electromagnetic force on damper bars,and could prevent the broken bar accident consequently.更多还原