Abstract
This paper presents a novel hybrid direct power converter (HDPC) which overcomes the two main disadvantages of matrix converters: limited voltage transfer ratio and low immunity to grid disturbance. The proposed converter is formed by integrating a reversible auxiliary boost converter in the dc link of the two-stage matrix converter. Therefore, the HDPC can provide unity voltage transfer ratio even in the case where the supply voltage is highly unbalanced. The proposed converter also preserves most of the inherent advantages of the conventional matrix converter such as: controllable input power factor, sinusoidal supply currents, and bidirectional power flow. A novel predictive current control technique for the HDPC is also proposed for minimum energy storage in the converter. Important aspects of design, control, and implementation of the new HDPC are presented including theoretical analysis and simulations. Experimental waveforms at unity voltage transfer using a laboratory prototype are presented to confirm the viability of the proposed idea.
Highlights
A Two-stage Matrix Converter (TMC) performs direct ac/ac power conversion without using any intermediate energy storage [1], [2]
The predictive current controller is used for the experimental setup which was digitally implemented in (a) Prediction of Vpn,REC for the instant(k + 1)
This paper proposes a novel hybrid direct power converter topology based on two stage matrix converter
Summary
A Two-stage Matrix Converter (TMC) performs direct ac/ac power conversion without using any intermediate energy storage [1], [2]. Any disturbances in the supply such as voltage unbalance and harmonics will be reflected in the load side, since no energy storage elements are involved in the power conversion. These disturbances deteriorate the quality of the output voltage and reduces the voltage transfer ratio. The proposed HDPC has lower energetic efficiency than the conventional TMC due to the addition of extra switching elements in the power flow. These additional devices increase the complexity of control, size and weight of the converter which are the main disadvantages of the new topology
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