Interharmonics monitoring of power network based on virtual instrument and MUSIC method

The interharmonics monitoring system of power network was developed based on virtual instrument. The system consists of sensors, signal conditioning circuits, data acquisitions and computers. Within the system, the method of multiple signal classification(MUSIC) method was applied to virtual instrument by using the MATLAB script node in LabVIEW, the parameters of interharmonics are identified, some essential issues, such as the spectrum distinguishing ability and the anti-noise ability of the algorithm, are researched. The simulation results show that by using the proposed method, the interharmonics near the integer harmonics can be detected accurately with higher anti-noise ability.