Researching on Multiple “Phase Hopping” AC-AC Frequency Conversion Circuit

Zhengwang Xu,Guozhuang Jiang,Zhuoxin Liu,Kun Ke,Ruizhang Zhang

doi:10.1109/access.2020.3022716

Zhengwang Xu, Guozhuang Jiang + Show 3 more

Open Access

https://doi.org/10.1109/access.2020.3022716

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Abstract

Frequency converter is a kind of important energy-saving device. As a kind of improved cycloconverter, the “phase hopping” AC-AC frequency converter can increase the output frequency to close to the line frequency and has the advantages of no circulation current and no dead zone. By combining multiple-stage AC-AC frequency conversion technology, the “phase hopping” AC-AC frequency conversion can regulate the output voltage and the output frequency at the same time. Relative to current frequency converters, it has the advantages of large capacity, high voltage level, and low cost. Taking a six-fold circuit as an example, all the voltage results are analyzed according to the voltage vector superposition method. Three groups of parameters are chosen as instances and performed a simulation with MATLAB in the condition of constant voltage to frequency ratio. Then an experimental platform is set up and the experimental analysis has been carried on. The experimental results are in good agreement with theory and simulation studies.

Highlights

As an important part of clean energy, electric energy plays an irreplaceable role in various fields
Some scholars have put forward the idea of multiple AC/AC frequency conversion circuits [11], [12], but they can only change the output frequency of the circuit singly, which limits the use of frequency converters
Though the circuit is a triple one rather than a six-fold one, according to the change of the number of ‘‘phase hopping’’, the output frequency can be changed, and the output voltage can be adjusted by combining the multiple circuits, the output current without circulation, and without the dead zone, it can be seen that the experimental results are in good agreements with the above theoretical analysis and simulation, that verifies the correctness of the above theoretical analysis and simulation analysis

Summary

INTRODUCTION

As an important part of clean energy, electric energy plays an irreplaceable role in various fields. Some scholars have put forward the idea of multiple AC/AC frequency conversion circuits [11], [12], but they can only change the output frequency of the circuit singly, which limits the use of frequency converters. The ‘‘phase hopping’’ AC-AC frequency conversion uses the thyristors to connect the output terminals to the input terminals of different phases to achieve frequency conversion. The output frequency of the single-phase ‘‘phase hopping’’ AC-AC frequency conversion circuit can be changed as needed; the output voltage is difficult to be changed. Z. Xu et al.: Researching on Multiple ‘‘Phase Hopping’’ AC-AC Frequency Conversion Circuit difficult to be changed. Different output voltages are got by using different angles between different vectors This technology has a good application prospect of high voltage, high capacity, and high output frequency.

THE PRINCIPLE OF ‘‘PHASE HOPPING’’ FREQUENCY

SIMULATION MODEL

EXPERIMENTAL VERIFICATION

ANALYSIS OF EXPERIMENTAL RESULTS

CONCLUSION