关于三级半桥LLC共振转换器三级混合优化控制的研究
Junrui Wang1, Jianfei Chen2, Dongqi Zhao2
1School of Electrical Information Engineering, North Minzu University, Yinchuan, 750000, China. jr09110111@163.com.
Scientific reports
|March 22, 2025
概括
本研究介绍了新能源汽车直流充电的新型三阶段混合控制策略. 它通过优化不同充电级别的零电压切换 (ZVS) 来确保高效运行和广泛的电压输出.
科学领域:
- 电气工程 电气工程
- 电力电子 电力电子 电力电子
- 可再生能源系统可再生能源系统
背景情况:
- 三级半桥LLC拓越来越多地用于新能源汽车的直流充电.
- 混合脉冲频率调制 (PFM) 和相位转移调制 (PSM) 对于宽输出范围是常见的,但在低输出时与零电压切换 (ZVS) 斗争.
研究的目的:
- 为了解决ZVS在LLC转换器中混合PFM/PSM控制的局限性,在低输出电压下.
- 为高效和稳定的直流充电开发一个优化的控制策略.
主要方法:
- 对LLC转换器ZVS条件的分析.
- 变频爆发调制 (VFBM) 的建议,以保持死亡时间和最低工作周期.
- 开发一个三阶段的混合控制策略,将VFBM,PSM和PFM与定义的切换点集成在一起.
主要成果:
- 在Matlab/Simulink中创建了一个模拟模型,用于600V输入,150-650V输出系统.
- 提出的战略成功地在低压区间实现了ZVS.
- 该策略表明了广泛的输出电压范围,并提高了系统效率.
结论:
- 三级混合优化控制策略有效地使ZVS在低电压下保持广泛的输出范围.
- 该系统具有稳定,连续和可调节的直流电压输出,具有准确的模式切换.
- 这种方法提高了直流充电堆系统的整体效率和性能.
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