Control Design and Stability Analysis of Power Converters: The Discrete Generalized Bode Criterion

For the controller design and stability analysis of power electronic converters, Bode criterion its subsequent revisions are most practical tools. However, even though control converter is usually implemented in a microprocessor, none these methods infallible when applied to discrete system. This article therefore proposes new criterion, named Discrete Generalized Criterion (DGBC). method based on Nyquist but developed from open-loop diagram, evaluated also at 0 Hz frequency. The proposed combines advantages criteria, since it always applicable provides an interesting useful tool for process. active damping inverter with LCL filter, showing how accurately predicts stability, contrast existing criteria. theoretical validated through experimental results performed three-phase filter.