A Sampling Optimized Method for Frequency Response Measurement in Power Electronics Systems

Frequency response measurement plays a crucial role in the design, analysis, and debugging of power electronics systems. However, traditional measurement methods, including the sweep method and the adaptive frequency injection method, have some problems in ease of use, stability, accuracy, and data inheritance. To address these problems, this article establishes a sampling optimized method based on the idea of global optimization by placing each measurement point in the interval with the largest estimated measurement error in the corresponding measurement cycle, so as to achieve a rapid reduction of the total measurement error. Compared with traditional methods, this method is easy to use, highly stable, and has higher accuracy than traditional methods, and its good data inheritance also allows users to incrementally add new points after the measurement is completed to further improve the accuracy. In addition, the importance of Uniqueness of Search Path is also revealed in this article. The effectiveness of the proposed method is demonstrated through extensive numerical tests and experiments.