一种改进型IPOS模块化LCC谐振变换器控制策略
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Improved Control Strategy for IPOS Modular LCC Resonant Converter
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    摘要:

    模块化技术可有效提高变换器容量,广泛应用于高压大功率场合。但由于模块间参数差异,各模块输出电压往往难以均衡,使得变换器难以稳定工作。针对输入并联输出串联IPOS(input-parallel output-series)模块化LCC谐振变换器,提出了一种改进型控制策略,主模块采用脉频调制PFM(pulse frequency modulation)方法调压,其脉频调制步长由数学模型准确给出,从模块采用脉宽-脉频调制PWM-PFM(pulse width modulation-pulse frequency modulation)方法调压。建立了该策略的控制流程,为控制算法的软件实现提供了依据;分别对主从模块调压方法进行了仿真分析,验证了所提出控制策略的可行性;对三模块变换器进行了实验分析,结果表明:所提出的控制策略可以实现模块间的均压控制和系统的恒压输出,具有稳态性能好、暂态响应快、抗扰动能力强的优点。

    Abstract:

    The modular technology is widely applied in high-voltage and high-power scenarios since it can significantly increase the converter capacity. However, due to the difference in parameters among modules, the output voltage from each module is often difficult to equalize, making the stable operation of the converter difficult. For input-parallel output-series(IPOS) modular LCC resonant converters, an improved control strategy is proposed in this paper. The master module regulates voltage by means of the pulse frequency modulation(PFM) method, whose accurate adjustment step is given based on a mathematical model. In addition, the slave module employs the pulse width modulation-pulse fre-quency modulation(PWM-PFM) method. The control flow of the proposed control strategy is established, providing a basis for the software implementation of the control algorithm. The simulation analyses of the master-slave modules are car-ried out to verify the feasibility of the proposed control strategy. Experimental results of a three-module converter show that the proposed control strategy can realize the voltage equalization control between modules and the constant voltage output from the system, which has advantages of good steady-state performance, fast transient response and strong anti-disturbance capability.

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杨晓光,席利根,李宇麒,高正,温静.一种改进型IPOS模块化LCC谐振变换器控制策略[J].电源学报,2022,20(2):1-8

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  • 收稿日期:2019-10-04
  • 最后修改日期:2020-01-13
  • 录用日期:2020-01-13
  • 在线发布日期: 2022-04-15