Digital Predictive Current Control Fed by Three-Level Indirect Matrix Converter under Unbalanced Power Supply Condition

Abstract

This paper presents an experimental evaluation of predictive current control fed by a three-level indirect matrix converter featuring instantaneous reactive power minimization strategy. The proposed topology combines the conventional indirect matrix converter with a back-to-back buck circuit which can synthesize multilevel dc-link voltage. A systematic rectifier switching strategy is elaborated to ensure positive fictitious dc-link voltage at any instant. The generic expression of the instantaneous reactive power was formulated for unbalance supply voltage. The proposed strategy undergone various transient and steady-state test and unbalance supply condition for thorough robustness assessment. The experimental results proved an excellent load current reference tracking with low ripple current and the reactive power minimization has been attained by empirical adjustment of the weighting factor.