Abstract
This paper proposes a novel high-gain AC-DC converter based on the Cockcroft-Walton (CW) voltage multiplier which can be utilized in motor drive systems with low input voltage. In this topology, use of the voltage multiplier and boost circuit results in the increment of converter gain which has a significant impact on the cost and efficiency of the system. Moreover, in this converter, the AC voltage is directly changed to DC voltage using the switching method in high frequency and, as well, the power factor is corrected. Besides, this high-frequency converter contributes to the reduction of output ripple. On the other hand, cost efficiency, the low voltage stress on capacitors and diodes, compactness, and the high voltage ratio, are achieved from the Cockcroft-Walton circuit. Furthermore, the hysteresis method is presented for converter switching to correct the power factor. The converter is simulated in MATLAB software to demonstrate the effectiveness of the suggested method. Lastly, a laboratory prototype of the suggested converter is built, several tests are done in order to verify the theoretical analysis, and comprehensive comparison with the state-of-the-art converter is done.
Highlights
Nowadays, high gain AC/DC converters are widely used in manufacturing, research, medicine, and the military, such as laboratory devices, X-ray facilities, dust screening, insulation inspection, and electrostatic coating [1,2,3,4]
We have introduced a new structure of an AC-DC high step-up converter which can be used as a power electronic interface for renewable energy systems
We sample the input voltage and use it to determine the phase of reference current as of the input voltage and the input current should be in phase for Power factor correction (PFC) operation
Summary
High gain AC/DC converters are widely used in manufacturing, research, medicine, and the military, such as laboratory devices, X-ray facilities, dust screening, insulation inspection, and electrostatic coating [1,2,3,4]. In other applications, such as a motor drive, the system consists of an inverter for controlling the motor and a typical type of rectifier for changing the AC to DC voltage. In order to use the variable generated power by renewable power plants, employing a high-performance interface system is inevitable. The interface system for a wind energy power plant includes two parts:
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