An Adaptive Regulation Strategy for Perturbation Magnitude in Impedance Measurement for Power Electronics Systems

The prevalent integration of power electronic converters in contemporary electrical energy systems poses significant stability challenges. Addressing these challenges necessitates the application of impedance-based stability criteria, where the precision of impedance information is significantly important. The industry favors the sinusoidal sweep method for impedance measurement due to its superior accuracy. Nonetheless, the conventional method of utilizing constant-magnitude perturbation signals may lead to issues concerning system safety and measurement accuracy. To mitigate these concerns, the industry has introduced the adaptive regulation method of perturbation magnitude. Despite this advancement, current methods are hindered by the lack of theoretical direction regarding the initial perturbation magnitude, the absence of procedural guidance on adaptive regulation techniques, and the incomplete assessment of regulation criteria. This paper explores an innovate adaptive regulation strategy for perturbation magnitude in impedance measurement considering measurement safety, accuracy and speed. It overcomes conventional methods limitations, offering theoretical support for setting the initial perturbation magnitude and optimizing the regulation process. The proposed method ensures accurate impedance measurement while minimizing disruptions to the system, guaranteeing the safety and rapidity of the measurement process. The effectiveness of the proposed method has been validated through simulation experiments.