Subsynchronous oscillation detection method, device and realization device for photovoltaic power generation system

The invention provides a subsynchronous oscillation detection method, a device and a realization device of a photovoltaic power generation system. The method comprises the following steps: acquiring avoltage signal of a photovoltaic power generation system; decomposing the voltage signal by the empirical mode decomposition algorithm, and obtaining the low frequency signal of the voltage signal; according to the low frequency signal and the preset parameter threshold, determining whether the photovoltaic power generation system has subsynchronous oscillation or not. The invention improves thedetection accuracy of the sub-synchronous oscillation of the photovoltaic power generation system, and simultaneously improves the detection efficiency. 本发明提供了种光伏发电系统的次同步振荡检测方法、装置及实现装置；其中，该方法包括：获取光伏发电系统的电压信号；通过经验模式分解算法对电压信号进行分解，得到电压信号的低频信号；根据低频信号及预设的参数阈值，确定光伏发电系统是否发生次同步振荡。本发明提高了对光伏发电系统的次同步振荡的检测准确性，同时提高了检测效率。