Method for measuring broadband harmonic waves of offshore wind power network

The invention provides an offshore wind power network broadband harmonic wave measuring method, which comprises the following steps of: based on recording data, solving a frequency spectrum coefficient by using a DFT (Discrete Fourier Transform) method to obtain a frequency spectrum image of the recording data, and extracting frequency, amplitude and phase information of fundamental waves and harmonic waves; judging the frequency range of inter-harmonics according to the frequency spectrum coefficient of the recording data and the frequency spectrum image, performing phase rotation on the DFT coefficient, eliminating the influence of frequency spectrum leakage by utilizing the characteristic that the phases of leaked side lobes are opposite after rotation, and solving the frequency, amplitude and phase information of the inter-harmonics; sorting the data to obtain each harmonic/inter-harmonic characteristic information in the actually measured recording data; and according to the emission characteristics of t