基于Switch-Capacitor网络实现分时供电的多输入升压变换器

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摘要在新能源联合发电系统中, 多输入直流变换器可分时或同时向负载提供能量, 具有简化系统结构、降低系统成本等优点。然而, 现有的多输入直流变换器不能很好地满足新能源发电领域对高升压比、低纹波、低开关应力等技术参数的要求。因此, 本文基于Switch-Capacitor网络串联放电、并联充电和多个网络累加升压的工作特性, 推导出一种新型多输入升压变换器。本文以三输入升压变换器为例, 详细分析了其在连续工作模式下的工作原理和工作性能, 进行了仿真分析, 并搭建了实验模型, 仿真分析与实验研究的结果表明：①升压能力强, 其升压比与Switch-Capacitor网络组中的网络个数有关；②开关器件的电压应力、输入电流纹波和输出电压纹波小；③所有开关管由同一控制信号隔离驱动, 控制电路简单；④实现分时供电, 元器件利用率高；⑤推演出对应的同时供电多输入升压变换器。

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	侯世英
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关键词 ： Switch-Capacitor网络, 升压比, 电压应力, 纹波, 元器件利用率

Abstract：In the renewable hybrid power generation system, multi-input DC/DC converter (MIC) can supply energy for the load individually or simultaneously, which can simplify the circuit and reduce the cost of the power system. However, the existing MIC can not meet some or all requirements of the technical parameters well, such as high step-up ratio, low ripples and low switch stress. Therefore, according to the switch-capacitor working characteristics of discharging in series, charging in parallel and boosting output-voltage by the add of several netwoks, a novel multi-input step-up converter is deduced in the paper. Taking the three-input step-up converter as the example in the paper, working principles and working performance of the converter in continuous operating mode are given. Simulation analysis and an experimental model is built, whose results indicates: ①High step-up capability and its step-up ratio is related with the number of networks in the switch-capacitor network assembly; ②low switch voltage stress, small input-current ripple and output-voltage ripple; ③Since all switches are drived by the same control signal in isolation, its control circuit is simple; ④It can attain the implementation of power supply individually with high ratio of devices; ⑤A corresponding multi-input step-up converter supplying power simultaneously is also deduced.

Key words： Switch-capacitor network step-up ratio voltage stress ripple ratio of devices

收稿日期: 2013-11-14 出版日期: 2014-06-27

PACS:

TM464

基金资助:输配电装备及系统安全与新技术国家重点实验室自主研究资助项目(2007DA10512711204)

作者简介: 侯世英, 女, 1962年生, 教授, 博士生导师, 主要研究方向为控制理论、电力电子技术在电力系统中的应用、功率变换器和新能源发电技术; 陈剑飞, 男, 1987年生, 博士研究生, 主要研究方向为功率变换器和新能源发电技术。

引用本文:

侯世英, 陈剑飞, 孙韬, 陈复, 唐荣波. 基于Switch-Capacitor网络实现分时供电的多输入升压变换器[J]. 电工技术学报, 2014, 29(4): 27-37. Hou Shiying, Chen Jianfei, Sun Tao, Chen Fu, Tang Rongbo. A Multi-input Step-up Converter for Individual Supplying Power Based on the Switch-Capacitor Network. Transactions of China Electrotechnical Society, 2014, 29(4): 27-37.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I4/27

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