Stability and Robustness analysis of Fractional Proportional Resonant controllers in Current-Controlled Voltage-Source-Inverters

This paper extends the Nyquist trajectory analysis for Fractional Proportional Resonant controllers applied to Current-Controlled Voltage-Source-Inverters in the continuous-time domain. The objective is to analyse the stability and robustness of the system under the use of this controller-type. Applying frequency specifications new analytical expressions are obtained and used to tune the controller.

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