Research on robust H2/H∞ optimization control for unified power quality conditioner in micorgrid

Abstract

There are diverse types of loads and power resources in microgrid, resulting in lots of power quality problems such as a large number of harmonics and voltage fluctuations. This paper established a unified math model of UPQC in micorgrid, a optimizing control method which based on the robust H2/H∞ controllers was proposed. Uncertain parameters of structures are introduced into state equation; meanwhile, both the H∞ disturbance suppression and the optimal H2 performances of the closed-loop control system are satisfied simultaneously for all allowable uncertainties. The robust H2/H∞ controller design was transformed into a optimal problem with constraints of linear matrix inequalities, the output feedback controllers can be applied. The theoretically analysis and simulation show it can get preferable control effect, fast dynamic response and good robustness.