一种数字控制交交变频的起动技术研究

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Abstract AC/DC/AC frequency converter technology has achieved fruitful results in the field of transmission. However, the performance of power-off device limites the ability to start at heavy loads. This paper designs an AC-AC converter based on digital control technology to solve the problems of large demand for starting moment, easy blocking and difficult speed regulation of high-power scraper conveyor in mine. This paper introduces the main circuit structure of the converter and the composition of the digital controller. The core controller CPU adopts the communication sampling principle based on DDS and the design of digital phase-locked loop, realizes the digitization of cosine intersection method. The master-slave three-phase independent control gives full play to the superior performance of the flexible electronic control of the mechanical structure. Finally, according to the simulation results in the simulink environment, it is verified that the scraper conveyor can start smoothly under different heavy load conditions.

Key words： start at heavy loads digital phase-locked loop master-slave independent control mechanical structure flexible electronic control

Received: 11 June 2019 Published: 27 February 2020

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	Articles by authors
	Yang Donglei
	Xie Cunfu
	Zhao Jianyang

Cite this article:

Yang Donglei,Xie Cunfu,Zhao Jianyang. Research on starting technology of digital AC frequency converter[J]. Electrical Engineering, 2020, 21(2): 60-64.

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http://dqjs.cesmedia.cn/EN/Y2020/V21/I2/60

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