当输入串联输出并联（ISOP）型双有源桥（DAB）DC-DC变换器系统各模块参数不同时,系统存在传输功率不均衡导致的过电压过电流现象,严重时可能损坏器件,此外变换器运行时还需考虑其电流应力与动态性能。针对这些问题,基于双重移相提出一种结合电流应力优化的电压均衡控制方案。分析双重移相下变换器的电流应力与传输功率模型,并通过KKT（Karush-Kuhn-Tucker）条件法求取电流应力最优的移相比公式。在电流应力优化的基础上提出一种电压均衡控制方法,通过传输功率模型推导桥间移相比表达式,引入均压分量和动态传输功率,实现输入电压均衡、输出电压稳定以及提高动态性能。最后,搭建双模块ISOP-DAB实验平台进行对比实验,验证所提控制方法的有效性。
Abstract
When the parameters of each module in the input series output parallel （ISOP） dual active bridge DC-DC （DAB） converter system are different, the system has over-voltage and over-current caused by unbalanced transmission power, which may damage the device in serious cases. In addition, current stress and the dynamic performance of converters should also be considered during operation. To address these issues, this paper proposes a voltage balance control scheme combined with current stress optimization based on dual phase shift. The current stress and transmission power model of the converter under dual phase shift is analyzed. And then the phase shift ratio for current stress optimization is obtained by the KKT condition method. On the basis of current stress optimization, a voltage balance control method is proposed. The outer phase shift ratio expression is deduced through the transmission power model, and the voltage balance component and dynamic transmission power are introduced to achieve input voltage balance and output voltage stability and improve dynamic performance. Finally, a dual-module ISOP- DAB experimental platform is built, and comparative experiments are carried out to verify The effectiveness of the control method in this paper is verified by the comparative experiments.
关键词
微电网 /
双有源桥DC-DC变换器 /
双重移相 /
电流应力优化 /
电压均衡
Key words
microgrids /
dual active bridge DC-DC converters /
dual phase shift /
current stress optimization /
voltage balance
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参考文献
[1] 贾燕冰, 田晋杰, 任春光, 等. 基于变换器级联的直流微电网混合储能系统及控制[J]. 太阳能学报, 2020, 41(5): 273-280.
JIA Y B, TIAN J J, REN C G, et al.Research on dc microgrid Hess based on converter cascade structure[J]. Acta energiae solaris sinica, 2020, 41(5): 273-280.
[2] 李彦君, 张兴, 赵文广, 等. 基于拓展移相调制的双有源桥回流功率优化策略[J]. 太阳能学报, 2022, 43(3): 216-222.
LI Y J, ZHANG X, ZHAO W G, et al.Optimized strategy of dual active bridge reflux power based on extended phase shift modulation[J]. Acta energiae solaris sinica, 2022, 43(3): 216-222.
[3] ZHANG J P, LIU J Q, YANG J X, et al.A modified DC power electronic transformer based on series connection of full-bridge converters[J]. IEEE transactions on power electronics, 2019, 34(3): 2119-2133.
[4] 杨景熙, 刘建强, 张捷频, 等. 基于双有源桥式DC-DC变换器的电力电子牵引变压器的电压平衡控制[J]. 电工技术学报, 2016, 31(S1): 119-127.
YANG J X, LIU J Q, ZHANG J P, et al.Voltage balance control of a power electronic traction transformer based on dual active bridge DC-DC converters[J]. Transactions of China Electrotechnical Society, 2016, 31(S1): 119-127.
[5] 高帅, 张兴, 赵文广, 等. 基于二次调压的串-并型双有源桥变换器模块化均压控制策略[J]. 太阳能学报, 2021, 42(5): 113-119.
GAO S, ZHANG X, ZHAO W G, et al.Input voltage sharing modular control strategy for ISOP-DAB converter based on secondary voltage regulation[J]. Acta energiae solaris sinica, 2021, 42(5): 113-119.
[6] 孙贺, 张建成, 付超, 等. 直流固态变压器控制技术研究[J]. 电网技术, 2018, 42(1): 56-65.
SUN H, ZHANG J C, FU C, et al.Research on control technology of DC solid state transformers[J]. Power system technology, 2018, 42(1): 56-65.
[7] AN F, SONG W S, YU B, et al.Model predictive control with power self-balancing of the output parallel DAB DC-DC converters in power electronic traction transformer[J]. IEEE journal of emerging and selected topics in power electronics, 2018, 6(4): 1806-1818.
[8] 蔡逢煌, 石安邦, 江加辉, 等. 结合电流应力优化与虚拟电压补偿的双有源桥DC-DC变换器三重移相优化控制[J]. 电工技术学报, 2022, 37(10): 2559-2571.
CAI F H, SHI A B, JIANG J H, et al.Triple-phase-shift optimal control of dual-active-brige DC-DC converter with current stress optimization and virtual voltage compensation[J]. Transactions of China Electrotechnical Society, 2022, 37(10): 2559-2571.
基金
山东省自然科学基金（ZR2023ME082）; 福建省自然科学基金（2021JO1637）
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