A Simple Method for Sinusoidal Input Currents of Matrix Converter Under Unbalanced Input Voltages

Abstract

When matrix converter (MC) works under unbalanced input voltages, sinusoidal input currents could be obtained if the input power factor angle in conventional control strategy is modified based on the positive and negative sequence components of input voltages. Some existing literature realized this goal by using sequence component separation, which was usually complicated and/or storage-consuming. Instead, a simple realization method is proposed by this letter to obtain sinusoidal input currents, which constructs the expected input power factor angle by filtering the square of input voltage vector with a notch filter. The proposed method is easy to implement since no sequence extraction algorithm is required. Experimental results demonstrate that, compared with the existing realization methods, the proposed method reduces the computation time and storage space with identical performance of improving input currents quality.

Modified control of the matrix converter-based drive for voltage sag impact reduction

“…Figure 1b presents a structural diagram for phase-to-ground fault K1 calculation. The diagram was created by interconnecting positive, negative, and zero sequence networks [12,13]. To simplify the calculation, a presumption that 6/0.4-kV transformers are unloaded is taken.…”

“…Power interruption by voltage sag has been studied extensively [8][9][10]. A technique to eliminate input current distortion due to input voltage unbalance was proposed in * Correspondence: gytis.petrauskas@ktu.lt [7,11,12], but these studies evaluated only abstract and conceptual powering conditions and did not cover combined fault calculation including the analysis of voltage distortion in the power supply lines of industrial enterprises. In [7,11], compensation strategies based on feedback and feed-forward methods were presented.…”

“…In [9,10], an approach was introduced to improve the performance of an adjustable speed drive under voltage sags for conventional two-stage diode supply-side inverter. In [12], a compensation method was presented based on a notch filter. In [13], a compensation method was presented based on optimal duty cycle recalculation and it was applicable only for unbalanced powering condition (voltage imbalance 15%-20%).…”

Fixed frequency finite-state model predictive control for indirect matrix converters with optimal switching pattern

“…only one device commutation separates the states I and I ) [25]. The values g i and g i are calculated according to (10) considering the two states I and I respectively. Therefore the cost function for the rectifier stage is…”

“…The cost functions of two adjacent switching states U and U plus a zero voltage state U 0 are calculated according to (10) and expressed as g u , g u , and g u0 respectively. The cost function for the inverter stage is defined as:…”