Fast Nonlinear Reference Governor for Overshoot Mitigation with an Application to Power Control of Grid-Connected Converters

A novel concept, termed the conditioning function, is introduced, leading to the development of a new nonlinear reference conditioning method called the conditioning-function-based reference governor (CF-RG). To achieve faster and more efficient responses, an enhanced version, referred to as the fast conditioning-function-based reference governor (FCF-RG), is proposed. This technique is based on an approximate calculation of the inverse of the nominal loop transfer function, allowing for rapid adjustments. The effectiveness of the proposed methods is demonstrated through both a mathematical example and an application to overshoot mitigation in active power control of a three-phase grid-connected converter. The results show that the proposed approaches provide an additional safety layer to the nominal controller, effectively limiting the output.