Frequency Adaptive Repetitive Control of Grid Connected Inverter for Wind Power Generation Systems

Abstract

This paper is concerned with the current control of grid connected inverters based on a simple frequency adaptive repetitive controller. The main objective of VSPT is to obtain an integer number of samples per grid period. Which solves the main problem of RC, i.e., the loss of rejection to periodic disturbance due to grid frequency is adjusted with a variable sampling period filter phase-locked loop, which also adds robustness to the system due to its inherent tolerance to grid voltage distortion and un balances, and events such as frequency steps and faults. The control and synchronism subsystems are described, designed, and verified experimentally in a obtained prove the accuracy of the proposed control even under servant disturbances, typically in grids with high WPGS penetration, providing ancillary functions to enhance reliability and reduce operational cost.