| 引用本文: | 冯兴田,万满满,马文忠,邵康,陶媛媛.基于负载匹配的三相交错并联LLC谐振变换器变模式控制策略[J].电力自动化设备,2019,39(6): |
| FENG Xingtian,WAN Manman,MA Wenzhong,SHAO Kang,TAO Yuanyuan.Variable mode control strategy of three-phase staggered-parallel LLC resonant converter based on load matching[J].Electric Power Automation Equipment,2019,39(6): |
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| 摘要: |
| 针对三相交错并联LLC谐振变换器的负载工况，提出一种基于负载匹配的变模式控制策略。当工作在额定负载时，采用脉冲频率调制(PFM)控制方法使其发挥最大效率；当工作在轻载时，设计对称脉宽调制(PWM)控制策略，利用电压增益曲线中负载独立点的特性设计开关频率，既实现了软开关，也限制了开关频率的增大。深入研究对称PWM控制下的工作原理与增益特性，进一步对变换器的线性控制区和非线性控制区展开分析。当工作在极轻载与空载状态时，采用Burst控制方法实现对输出电压的有效控制。此外，对不同控制策略之间切换点的选择进行了详细分析与优化设计，准确可靠地实现了变模式控制。最后，基于碳化硅器件研制变换器实验样机，验证对变换器进行性能分析和变模式控制策略的正确性与合理性。 |
| 关键词: LLC谐振变换器 软开关 对称PWM 变模式控制 碳化硅 |
| DOI：10.16081/j.issn.1006-6047.2019.06.007 |
| 分类号:TM46 |
| 基金项目:国家自然科学基金资助项目(51777216)；中央高校基本科研业务费专项资金资助项目(18CX02114A) |
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| Variable mode control strategy of three-phase staggered-parallel LLC resonant converter based on load matching |
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FENG Xingtian1, WAN Manman2, MA Wenzhong1, SHAO Kang1, TAO Yuanyuan1
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1.College of Information and Control Engineering, China University of Petroleum(East China),Qingdao 266580, China;2.China Institute of Atomic Energy, Beijing 102413, China
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| Abstract: |
| A variable mode control strategy is proposed for a three-phase staggered-parallel LLC resonant converter, in which the load matching for load conditions is considered. In the case of rated load conditions, the PFM(Pulse Frequency Modulation) control method is used to maximize its performance efficiency. On the light load condition, the symmetrical PWM(Pulse Width Modulation) control strategy is designed, and the switching frequency that considers the characteristics of the load-independent point in the voltage gain curve is designed, which not only realizes soft switching, but also restricts the increase of switching frequency. The working principle and gain characteristics of symmetrical PWM control are studied, and the linear and nonlinear control zone of the converter are analyzed in detail. On the extremely light load and no load conditions, the Burst control method is employed to enable an effective control of the output voltage. Besides, the selection of switching points between different control strategies is analyzed and designed in detail, and the variable mode control strategy is realized accurately and reliably. The converter experimental prototype is developed based on SiC devices to verify the effectiveness and rationality of the performance analysis and variable mode control strategy of the converter. |
| Key words: LLC resonant converter soft switching symmetrical PWM variable mode control SiC |
