A New Parameter Tuning Method for Generalized Multiresonant Current Controllers in Grid-Connected Inverters

Multiresonant controllers are widely used in the current control of grid-connected converters due to their accurate tracking of reference sinusoidal signals containing high harmonic counts. However, the performance of multiresonant controllers relies heavily on the suitability of the parameter design. In this paper, a generalized multiresonant controller that unifies various existing resonant controllers is proposed, which achieves the decoupling of the proportional terms, eliminates the need for online operation of trigonometric functions, and obtains a more extensive range of regulation capability. Furthermore, a new multioptimized parameter tuning method that considers several performance indexes is proposed to utilize the generalized resonant controller's performance fully. Finally, based on the proposed method, a generalized multiresonant controller is designed for <inline-formula><tex-math notation="LaTeX">$ {\bm {L}}$</tex-math></inline-formula>-type and <inline-formula><tex-math notation="LaTeX">$ {\bm {LCL}}$</tex-math></inline-formula>-type grid-connected inverters, respectively, demonstrating the universality of the proposed approach. Simulation and experimental results validate the effectiveness of the proposed method.