Control Structure withFuzzy SupervisionofP1 ParametersinaMultilevel Converter Application

Thispaperpresents anovelcontrol structure based onmixedtechniques (Fuzzy andPI's) forthecontrol ofaneutral- point-clamped converter. Thisstructure implies threePI regulators withanadaptative fuzzyself-tuning regulator. The constants oftheproportional andintegral actuators (kp andki, respectively) aresimultaneously adjusted forthevoltage and current control loops. Thismethodachieves optimal performance ofthesystemunderloadstepsregarding dc-link voltage regulation andaccurrents. A theoretical stability analysis isalso performed. Thesystemistested bysimulation andexperiment underrectifier operation mode. IndexTerms-Boostrectifier, fuzzy supervisor, neutral-point- clamped (NPC)converter, self-tuning regulator, Takagi-Sugeno- Kang(TSK), three-level converter.

[1]  Bong-Hwan Kwon,et al.  A line-voltage-sensorless synchronous rectifier , 1999 .

[2]  José R. Espinoza,et al.  A systematic controller-design approach for neutral-point-clamped three-level inverters , 2005, IEEE Transactions on Industrial Electronics.

[3]  D. Boroyevich,et al.  Simplified linear-quadratic regulator applied to a three-level converter , 2005, 2005 European Conference on Power Electronics and Applications.