A Robust H-infinity Control Approach Employed in 3-Phase Shunt Active Power filter

Abstract

A robust H∞ control approach has been suggested in current regulation for a 3-phase shunt-active-power-filter (SAPF) system. A novel Kalman-filter based current reference method is also suggested to avoid proportional integral (PI) controller loop ensuing an inexpensive SAPF system. This reference-current generation system regulates the dc-linkage voltage through a robust and fast estimation of the source reference current amongst load varying situations. The suggested control approach for SAPF has been verified through d SPACE DS1104 board comprising TMS320F240 as a slave DSP. Through investigational outcomes, it is perceived that the suggested scheme shows robustness towards parameter fluctuations, inconsiderateness to grid disturbances like voltage alteration, frequency deviance and measurement noise. Therefore, the power-quality improvement is accomplished with perfect current-harmonics cancellation.