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Study on the "Phase Hopping" AC-AC Frequency Conversion Method with Approximately Continuous Frequencies

[ Vol. 13 , Issue. 8 ]

Author(s):

Zhengwang Xu, Guozhuang Jiang*, Ke Kun and Yuchun Yi   Pages 1217 - 1226 ( 10 )

Abstract:


Background: The output voltage frequency for the previously proposed "phase hopping" AC-AC frequency conversion technology is determined by the law that the number of output voltage cycles is reduced by one relative to the power frequency in a large cycle containing six jumps. According to the law, only a limited number of output frequencies, such as 37.5 Hz, 42.86 Hz and 45 Hz are found. Due to the large spacing between the output frequencies, the "phase hopping" frequency conversion technology is difficult to put into practical use.

Methods: In this paper, the law of the output frequency control is generalized so that the number of output cycles in a large cycle is reduced by n relative to the power frequency. The analysis shows that the appropriate selection of large cycles, including the number of power frequency cycles and the value of n, can find more frequencies to be used. Reducing the interval between the output frequencies within 1Hz.

Results: The analysis results were verified in simulation by MATLAB, and the harmonics and the feasibility of the actual application were analyzed.

Conclusion: Finally, an experimental platform was built and an experimental analysis was carried out. The experimental results show that the theoretical and simulation analyses are correct.

Keywords:

AC-AC frequency conversion, phase hopping, thyristor, MATLAB simulation, insulated gate bipolar transistor (IGBT), AC-DC-AC converter.

Affiliation:

Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan, Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan, Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan, Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan



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