负荷波动对强迫振荡扰动源定位的影响

持续的周期性小扰动容易引发电力系统的强迫功率振荡,因此准确定位扰动源对提高电网的稳定性具有重要意义。基于此,本文在能量函数法的基础上研究了负荷波动对扰动源定位的影响。在单机无穷大模型基础上推导了计及持续增长负荷的能量函数表达式,并以四机两区系统进行验证,研究结果表明,负荷增加、减小都会影响系统势能的分布,势能变化为正的机组有可能变负,从而影响扰动源定位的准确性;负荷波动对扰动源定位的影响取决于负荷波动导致能量消耗的大小;负荷节点与扰动源所在机组的电气距离越近,负荷变动对扰动源定位产生的影响越大。

Influence of load fluctuation to forced oscillation disturbance source location

Studies have shown that the forced power oscillation of the power system may be caused by the sustained periodical small amplitude disturbance.Locating the disturbance source accurately is of vital importance for the stability of the power grid.The influence of load fluctuation to the forced oscillation disturbance source location is studied based on the method of energy function.The expression of energy function considering load growth is given firstly,which is based on the model of the one-machine infinite-bus system.The simulation results based on two-area with four-machine system showed that the potential distribution will be effected by sustained load change.Potential changes in a positive unit might become negative,thereby affecting the accuracy of the disturbance source location.The accuracy of disturbance source location depends on the value of energy consumption caused by the load change.The closer the electric distance between the load node and the source of the disturbance source,the greater the influence of the load fluctuation on the location of the disturbance source.