本公开提出了一种新能源柔性直流并网暂态谐波检测方法及系统，采用皮尔逊相关系数法确定VMD分解模态分量个数K，利用奇异值分解(Singular Value Decomposition,SVD)精确定位信号扰动起止时刻，最后通过Hilbert变换及最小二乘拟合提取瞬时幅值频率信息，在实现暂态谐波信号的高精度检测和扰动定位的同时，提高了算法自适应性和计算效率。本公开提高了谐波检测的效率和准确性，有利于根据检测结果对谐波进行治理，减少了电网功率损耗，减少暂态扰动对电网稳态运行产生冲击，提高电网运行的稳定性。
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