Direct Power Fuzzy Control of Three-Phase AC-DC Converter using a Space Vector Modulation

In the conventional Direct Power Control (DPC) the active/reactive powers and line currents have high ripples caused by the switching frequency variations. To repair it, in this paper the Space Vector Modulation (SVM) is used. This paper will aim firstly at developing a new SVM-DPC structure based Fuzzy Logic Controllers (FLC's) to overcome the SVM-DPC based Proportional-Integral (PI) controller limitations, such as the sensitivity to the external disturbances and the parameter uncertainties. In order to rectify the disadvantages of traditional SVM-DPC approach, active power and reactive power fuzzy logic controllers were designed to replace the classical active and reactive powers PI controllers. The active power and reactive power fuzzy logic controller has two inputs (active/reactive power error and its change rate) and one output (active/reactive component of the reference vector voltage). Numerical simulation results are given for conventional Proportional-integral and Fuzzy Logic Controllers to prove the performances of the proposed strategy. The simulation verifies that fuzzy SVM-DPC is able to of effectively improve control performance in terms of settling time, overshoot, steady state, line current harmonics and total harmonic distortion.