Pulse width modulation technique for a three‐to‐five phase matrix converter with reduced commutations

Abstract

Variable-speed multiphase drive systems have become an increasingly important topics compared with conventional three-phase one due to their distinct advantages. This study presents a new pulse width modulation (PWM) technique for controlling the three-to-five phase matrix converter to reduce the commutation number of the power switches and the total harmonic distortion, simultaneously. The proposed PWM technique provides full output voltage and frequency control in addition to unity input power factor by changing only five switch states during the control period. Moreover, it prevents direct switching or commutation between the maximum and minimum input voltages to reduce the switches voltage stress. Moreover, the proposed PWM technique provides output voltage ratio equal to 78.86% of the input voltage. The effectiveness of the proposed control scheme has been verified theoretically by using PSIM software and experimentally by using a laboratory prototype.

Original Approach Toward Three-Phase Indirect Matrix Converters Through Hybrid PWM Modulation and DSP Implementation

“…Let t V 7 be the time of application of V 7 , and let t 0 be the time of the freewheeling phase. Equation (21) depicts that t V 7 is directly proportional to via the slope µ. Accordingly, the time of application of the following null space vector t Vf is alternatively expressed in Equation 22;…”

Modulación Indirecta para el Convertidor Matricial Directo

“…Donde: M= se refiere a la tensión de fase de entrada con polaridad distinta a las otras dos, L= se refiere a la tensión fase más pequeña de las tensiones de entrada restantes, K= se refiere a la tercera tensión de entrada j= a, b, o c. Existen modulaciones sinusoidales y vectoriales para este tipo de convertidores, éstas de igual manera pueden realizar divisiones por intervalos y/o modificaciones de las portadoras, se pueden encontrar más detalles en (Sayed et al, 2016), (Blaabjerg et al, 2002).…”

“…Cada interruptor es de cuatro cuadrantes para permitir la operación adecuada del convertidor matricial. Las técnicas de modulación utilizadas tradicionalmente son Alesina-Venturini (Alesina et al, 1989y 1981, (Rodríguez et al, 2016), (Venturni et al, 1980); el método escalar de Roy (Roy et al, 1989), método de portadoras (Yoon et al, 2006), (Sayed et al, 2016) y la modulación vectorial (Huber et al, 1995), (Casadei et al, 2002), (Hojabri et al, 2011), (Chai et al, 2016), (Blaabjerg et al, 2002), (Rivera et al, 2013). Todos estos métodos consideran al convertidor matricial como una sola etapa para establecer las señales de control que permitan una correcta operación del sistema.…”

Research on Commutation and Coordination Control Strategy of Excitation Power Supply Based on Bidirectional Reduced Matrix Converter for Ion Accelerator

“…Reference [12] proposed a four-step commutation method based on input voltage of relative size, however, the disadvantages of this method are that the requirement of the voltage detection device is high, temperature drift and zero drift of the detection device can easily cause judgment mistakes, and a short-circuit would occur if there is a voltage reversal during the commutation. There are also other commutation strategies as presented in papers such as references [13,14]. But this paper puts forward a new hybrid commutation strategy combining simplified three-step commutation with zero vector commutation to solve an important problem for the reliable and safe operation of BRMC.…”