Abstract
Matrix converters have many advantages, including high-efficiency, single-stage AC/AC energy conversion, bidirectional power flow, a near-unity input power factor, sinusoidal three-phase input currents, and sinusoidal three-phase output currents. However, matrix converters have 360 Hz voltage pulsations at the virtual DC-bus, which produce input harmonic currents and output harmonic currents, which cause unsatisfactory responses. To solve the problem of the input harmonic currents, a systematic design of an input three-phase current modulation method and an input three-phase AC filter that uses two different design methods are proposed. In addition, to improve dynamic responses, two predictive speed controllers are investigated and compared, and a predictive current controller is studied to reduce the output harmonic currents. A digital signal processor and an FPGA are used to execute the control algorithms. Several experimental results validate the theoretical analysis and show that the proposed methods effectively improve the power quality of the PMSM drive system and its input power-source quality.
Highlights
Matrix converters have simple and compact power circuits, which provide bidirectional power flow, sinusoidal input currents, sinusoidal output currents, a unity input power factor, and regeneration capabilities [1]
Matrix converters have gained a lot of attention from researchers, and several have focused on improving the input currents for matrix converters
Two different design methods, which are simpler than the traditional numeric methods, using a computer for a three-phase input AC filter for matrix-converter
Summary
Matrix converters have simple and compact power circuits, which provide bidirectional power flow, sinusoidal input currents, sinusoidal output currents, a unity input power factor, and regeneration capabilities [1]. Lei et al proposed a damping control of matrix converter via modifying input reference currents by injecting damping signals. By using this method, the oscillations in input currents could be suppressed directly [2]. Kume et al studied an integrated filter, which reduced commonmode currents, and provided near sinusoidal output voltages. By using that integrated filter, the traditional R-L-C filter was eliminated [6]. Liu et al investigated a modeling analysis and parameters design of an LC-filter. Those experimental results showed that the LC-filter-integrated quasi-Z-source network provided the necessary functions. The traditional input filter was eliminated [7]
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