A New Approach to the PWM Modulation for the Multiphase Matrix Converters Supplying Loads with Open-End Winding

Abstract

This article presents three variants of the Pulse Width Modulation (PWM) for the Double Square Multiphase type Conventional Matrix Converters (DSM-CMC) supplying loads with the open-end winding. The first variant of PWM offers the ability to obtain zero value of the common-mode voltage at the load’s terminals and applies only six switches within the modulation period. The second proposal archives for less Total Harmonic Distortion (THD) of the generated load voltage. The third variant of modulation concerns maximizing the voltage transfer ratio, minimizing the number of switching, and the common-mode voltage cancellation. The discussed modulations are based on the concept of sinusoidal voltage quadrature signals, which can be an effective alternative to the classic space-vector approach. In the proposed approach, the geometrical arrangement of basic vectors needed to synthesize output voltages is built from the less number of vectors, which is equal to the number of the matrix converter’s terminals. The PWM duty cycle computation is performed using only a second-order determinant of the voltages coordinate matrix without using trigonometric functions. A new approach to the PWM duty cycles computing and the load voltage synthesis by 5 × 5 and 12 × 12 topologies has been verified using the PSIM simulation software.

Design advantages and analysis of a novel five-phase doubly-fed induction generator

“…One of the main design advantages of the multiphase control winding is more flexible frequency converter control, where more advanced PWM control strategies can be implemented (Szczepankowski et al, 2021). The main advantage is the improvement in the rotor control winding supply current quality.…”

“…This paper presents a behavioral level model of a novel five-phase DFIG based on the winding function approach (WFA). The main advantage of this approach is that the model description is based on actual machine winding distribution and the airgap geometry (Krause et al , 2013; Morawiec et al , 2020a; Szypulski and Iwański, 2018). The main disadvantage of WFA is the simplification regarding omitting the tangential airgap flux density component (Krause et al , 2013; Szypulski and Iwański, 2018).…”

“…The main advantage of this approach is that the model description is based on actual machine winding distribution and the airgap geometry (Krause et al , 2013; Morawiec et al , 2020a; Szypulski and Iwański, 2018). The main disadvantage of WFA is the simplification regarding omitting the tangential airgap flux density component (Krause et al , 2013; Szypulski and Iwański, 2018). However, this fault only applies to large airgap machines and is insignificant in induction machines (Adamowicz et al , 2015; Kołodziejek and Wachowiak, 2022).…”