Abstract: In order to improve the analysis accuracy of transient disturbances and high-frequency disturbances in new energy power systems, the paper compares and analysis time-frequency resolution among generalized S transform, multi-resolution generalized S transform, multi-resolution hyperbolic S transform, based on Blackman window and window Aspect ratio S transform and based on Kaiser window and frequency variable parameter S transform. In improving the accuracy of transient disturbance analysis such as voltage interruption, it is found that compared to changing the window parameters,changing the window type can more significantly improve the time-domain resolution of the S transform.In terms of improving the accuracy of high-frequency disturbance analysis such as high-order harmonics,it is found that compared with the multi-resolution method, the conversion window width control method can significantly improve the frequency domain resolution of the S transform. Through the quantitative analysis of simulation experiments, the Kaiser window S transform based on the improved window type and window control method has the most obvious advantage in the analysis of transient disturbances and high-frequency disturbances in time-frequency resolution, which can provide certain guidance for the application of power quality disturbance analysis.