In harmonic analysis of power system

spectrum leakage and fence effect pose significant challenges to the accuracy of signal detection.In order to effectively reduce the influence of spectrum leakage and fence effect on harmonic detection

a second-order hybrid convolution window bispectral interpolation algorithm based on Hanning window and five-term Maximumsidelobe-decay(MSD)window is constructed. The algorithm not only ensures that the width of the main lobe meets the requirements

but also significantly improves the sidelobe characteristics

and the bispectral interpolation algorithm can detect the amplitude

phase and frequency of complex harmonic signals more accurately.The simulation analysis of complex harmonic signals shows that the proposed method has higher detection accuracy and stability when dealing with complex harmonic signals

especially in the presence of white noise interference.