励磁系统中附加调差对电力系统振荡模式阻尼的影响  

Impact of Reactive Current Compensation in Excitation System on Damping of Power System Oscillation Modes

作　　者：霍承祥[1] 刘增煌[1] 濮钧[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2011年第4期65-70,共6页Power System Technology

摘　　要：将附加调差引入菲利蒲-海佛隆模型,分析附加调差对模型参数的影响,推导出附加调差提供的阻尼转矩系数增量?KD随附加调差系数XC的变化是一条二次抛物线,且这条抛物线的特性与励磁参数、发电机参数、运行状况及线路参数有关。证明了此抛物线在以?KD为纵轴、以XC为横轴的坐标系中必经过原点,且与横轴的第2个交点随发电机功角变化而单调变化。根据此抛物线可全面说明附加调差对系统阻尼的影响情况。两机系统及实际互联电网各典型振荡模式的计算结果与理论推导吻合。Leading reactive current compensation （RCC） into Philips-Heffron model and analyzing the effect of RCU on model parameters, it is derived that the variation of damping torque coefficient increment AKD offered by RCC with the coefficient Xc of RCC follows the relation of quadratic parabola, and the characteristics of such a parabola is related to excitation paramters, generator parameters, operating condition and parameters of transmission line. It is proved that this parabola bounds to pass through the origin of the coordinate system, which takes AKD as the ordinate axis and Xc as the abscissa axis, and the position of the second intersection point of the parabola with the abscissa axis monotonously varies with the variation of generator angle. The impact of RCC on system damping can be fully explained by the parabola. The effect of RCC on power system oscillation modes is verified by the calculation results of two-machine system, and the computing results of typical oscillation modes of actual interconnected power grid conform to theoretical derivation.

关 键 词：励磁系统 附加调差 菲利蒲-海佛隆模型 同步转矩 阻尼转矩 

分 类 号：TM72[电气工程—电力系统及自动化]