基于高频交流链接技术的大功率高压直流电源

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Abstract High power DC power supply usually adopts DC-link and passive power factor correction method, resulting in serious line current harmonics and low power factor at grid side. The converter based on high frequency AC-link technology has excellent properties at grid side. In addition, since large capacitors and line filters are no more needed, the size can be reduced for the high power supply, and combined with the traditional series resonant circuit, the switching losses can also be reduced. This article analyzes the characteristics of DCM resonant current excited by the three-phase grid, and provides an accurate theoretical solution for control with state-plane diagram method. The PDM method is used to adjust and stabilize the output voltage. This article provides a feed-forward control strategy based on the current characteristics analysis, and builds a control system combined with the feed-forward and feed-back controls. The simulation and experimental results show that, with the proposed accurate solution and control system, and at the condition of generating 4kV on a 560Ω resistor, the output voltage ripple (p-p) is lower than 1%, meanwhile, at the grid side, the power factor is almost 1 and the total harmonic distortion (THD) of each line current is lower than 5.5%.

Key words： AC-link high power high voltage DC power power factor total harmonic distortion

Received: 02 July 2014 Published: 01 September 2016

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TM89

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	Li Wei
	Liu Qingxiang
	Zhang Zhengquan
	Li Xiangqiang

Cite this article:

Li Wei,Liu Qingxiang,Zhang Zhengquan等. High Power High Voltage DC Power Supply Based on Series-Resonant High Frequency AC Link Technology[J]. Transactions of China Electrotechnical Society, 2016, 31(16): 65-71.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I16/65

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