Modulation strategies based on mathematical construction method for matrix converter under unbalanced input voltages

Abstract

Owing to the direct coupling between the input and output of matrix converter, the abnormal power supply could disturb the output voltage easily. In this study, three modulation strategies for matrix converter based on mathematical construction are proposed under unbalanced input voltage conditions. The strategies are developed based on the construction of the rectifier and inverter modulation vectors in three different ways. By regulating appropriately the modulation index of inverter vector, the output voltages of matrix converter can maintain sinusoidal and balanced. The different rectifier vectors result in different input currents. Moreover, the analytical solutions for input currents with the three methods are presented, and the approximated solutions are derived to estimate their low-order spectrums. Comprehensive comparisons among the three methods are made in the aspects of the complexity of realisation, voltage-transfer capability and input current quality. Simulation and experimental results verify the correctness and effectiveness of the proposed methods.

İki-Fazlı AC-AC Çeviricinin Tasarımı ve Gerçekleştirilmesi

“…Ayrıca giriş ve çıkış dalga şekillerinin sinüzoidal olması önemli bir özelliğidir. Bu özelliklerine ilave olarak matris çevirici tam kontrollü giriş yer değiştirme faktörüne sahiptir [14]. Giriş geriliminden faydalanma oranı üç-fazlı matris çeviriciler için %86,6 ve tek-fazlı matris çeviriciler için %50-60 arasında değişmesi en büyük dezavantajdır.…”

A Current Control Approach for an Abnormal Grid Supplied Ultra Sparse Z-Source Matrix Converter with a Particle Swarm Optimization Proportional-Integral Induction Motor Drive Controller

“…The MC family is still categorized as a laboratory AC/DC driver with little reliable potential for industrial use [6,7] because of the control complexity [8], sensitivity in the face of abnormal input [9], limitation of the voltage transfer ratio up to 86.6% [10], and excess semiconductor switches [11]. These are the most critical obstacles to overcome, and, hence, solutions would be welcomed by manufacturers and industrial developers.…”

An Online Modulation Strategy to Control the Matrix Converter Under Unbalanced Input Conditions

“…The methods presented in [4]- [7] reduce the undesirable harmonics in the output voltages of the MC. The proposed methods in [1], [2], [8], [10], [12] target improving the quality of the input currents while generating balanced voltages at the Jaya Deepti Dasika is with School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907-2035 USA (email: jdasika@purdue.edu).…”

“…In [9] and [3], a feed-forward method, based on the instantaneous measurement of the input voltages is proposed. References [1], [2], [8] improve the quality of the input currents under unbalanced conditions. In [10], the modulation strategy proposed in [13] is modified to eliminate the undesirable harmonics in the input currents.…”