基于频域分析的无拍频控制策略离散化方法

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Abstract Because of the configuration of the single-phase converter in the traction system, DC-link voltage contains a ripple component with a twice frequency of the catenary. The ripple voltage will cause motor torque and current pulsation, which is called beat phenomenon. LC filter is often installed in DC link to absorb the pulsating power, but this traditional method will cause lower power density and higher cost. The origin of beat phenomenon is analyzed in this paper, and a beat-less control scheme is discussed in detail. The performance of the controller in digital system is determined by discretization method. In this paper, the ripple voltage sampled by backward Euler discretization method is optimized to accurately obtain the ripple component, and the beat-less controller is discretized in 8 methods, by comparison of discrete precision, control performance and the complexity to implement in digital system, an optimal discretization method is chose for the controller. Simulation and experimental results confirm the effectiveness and validity of the proposed scheme.

Key words： Beat-less control discrete method vector control traction system

Received: 10 September 2014 Published: 29 June 2015

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TM46

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	Articles by authors
	Dong Kan
	Diao Lijun
	Tang Jing
	Chen Yizhou
	Liu Zhigang

Cite this article:

Dong Kan,Diao Lijun,Tang Jing等. Discrete Method Research for Beat-less Control Strategy Based on Frequency Domain Analysis[J]. Transactions of China Electrotechnical Society, 2015, 30(10): 283-291.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I10/283

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