Harmonic impedance estimation method suitable for fan to be connected to power distribution network

The invention discloses a harmonic impedance estimation method suitable for a fan to be connected to a power distribution network, which comprises the steps of firstly measuring to obtain a harmonic voltage and a harmonic current at a PCC (Point of Common Coupling), then performing data processing on the harmonic current by adopting a self-adaptive k-means mean value clustering algorithm accordingto the obtained harmonic current data, taking segmented harmonic current data and corresponding harmonic voltage data as measurement mixed signals, taking the harmonic current injected by a system side and the fan as unknown signal sources, solving an unknown mixed matrix by adopting a robust independent component analysis algorithm, and obtaining a harmonic impedance of the system side accordingto an algebraic relation between elements of the estimated mixed matrix. The harmonic impedance estimation method of the invention is suitable for the characteristics of randomness, strong uncertainty and the like of the harm