励磁附加调差对电力系统阻尼特性影响的机理分析  

The Principle of the Influence on the Power System Dynamic Damping Caused by the Reactive Current Compensation

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电力系统研究所,北京100192

出　　处：《大电机技术》2012年第2期53-57,共5页Large Electric Machine and Hydraulic Turbine

摘　　要：本文研究了励磁系统附加调差对系统阻尼的影响。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ΔKD随附加调差系数XC变化的曲线为一条二次抛物线,而且这条抛物线的开口方向和位置与励磁参数、发电机参数、运行状况及系统参数有关。证明了此抛物线在以ΔKD为纵轴、以XC为横轴的坐标系中必经过原点,在其他参数确定的前提下,抛物线与横轴的第二个交点是发电机功角的函数。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。现场试验结果与理论推导相符。Based on the single-machine-infinite-bus system,the effect of Reactive Current Compensation（RCC） on the system damping is studied.First of all,RCC is added into the Phillips-Heffron model and the influence on the model and parameters caused by RCC is analyzed.Then the study proves that the relationship of the damping torque coefficient increment（ΔKD） provided by RCC and RCC coefficient（XC） is a second-degree parabola.Furthermore the open direction and position of the parabola are related with the excitation parameters,the parameters and the operating conditions of the generator and the system parameters.Finally the conclusion is given： the parabola passes through the zero point in the coordinate system whose abscissa axis is XC and vertical axis is ΔKD,and the second crossing point between the parabola and the abscissa axis will change with the power angle of generator if the other parameters are determinate.The effect of RCC on the dynamic damping can be explained comprehensively based this parabola.The field test result is in concord with the analysis.

关 键 词：励磁系统 附加调差 菲利蒲-海佛隆模型 阻尼 同步转矩 阻尼转矩 

分 类 号：TM761[电气工程—电力系统及自动化]