Output Feedback Control Strategy of Parallel Hybrid Filters

In this paper, the authors propose a novel control strategy of active hybrid filters. The adopted hybrid filter consists of an active filter and a passive filter connected in parallel. The power rating of the converter is reduced compared with simple active filter. The control is introduced to allow active filtering of load harmonics and active damping of passive filter connected in parallel with the active filter. When connected in power grid, the complete system is adjusted to prevent risk of resonance as well as harmonic filtering. A complete modeling of the system is achieved using a simple structure and effective corrector is developed. An important characteristic of the proposed control scheme is that it results in a simple static output feedback controller. Complete simulation of the system validates efficiency of the control law.