发电厂内强迫共振型低频振荡源的定位方法

Disturbance source locating for compelled resonance low-frequency oscillation of power plant

强迫共振型低频振荡严重危害了电网的安全稳定运行,快速查找并切除扰动源对消除振荡恢复系统稳定意义重大。利用低频扰动电压的衰减特性,提出一种发电厂内强迫共振型低频振荡源定位的新方法。首先利用三次Hermite插值函数提取各个测点的低频振荡扰动变量;然后通过比较各个测点扰动电压的幅值大小定位低频振荡源机组;最后通过理论分析、六机无穷大系统的仿真分析以及某发电厂的实际相量测量单元测量数据的分析,对该方法的正确性进行了验证。

Since the compelled resonance low frequency oscillation seriously endangers the safe and stable operation of power grid,the disturbance source should be quickly found and removed for the oscillation elimination and system stability restoration. A method of disturbance source locating based on the attenuation characteristics of low-frequency disturbance voltage is proposed,which adopts the cubic Hermite interpolation function to extract the low-frequency disturbance variables for each measuring point,compares the magnitude of disturbance voltage among measuring points to locate the source unit of low-frequency oscillation. The correctness of the proposed method is verified by theoretical analysis,the simulative analysis for a 6-machine infinite system and the PMU measuring data analysis for a real power plant.