高效率LLC谐振变换器的定频混合控制策略
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摘要
LLC谐振变换器为实现输出电压在宽范围内变化,普遍采用变频控制策略。然而变频控制策略存在谐振参数设计困难、变压器体积较大和电磁兼容等问题。为克服变频控制策略中存在的问题,提出定频变母线电压和移相混合控制策略。通过增大副边开关管零电流关断范围,提高变换器的工作效率和功率密度。分析所提控制策略的工作过程和软开关实现条件,并提出谐振网络参数设计方法。
LLC resonant converter generally uses variable frequency control strategy in order to achieve a wide range of output voltage variation. However,the variable frequency control strategy has difficulties in designing resonant parameters,large transformer volume and electromagnetic compatibility. To overcome these problems in the frequency conversion control strategy,a hybrid control strategy of fixed-frequency bus voltage variation and phase shifting is proposed. By increasing the zero current turn-off range of the secondary-side switching transistor,the operating efficiency and power density of the converter are improved. The working process of the proposed control strategy and the soft-switching implementation conditions are analyzed,and the design method of resonant network parameters is proposed.
LLC resonant converter generally uses variable frequency control strategy in order to achieve a wide range of output voltage variation. However,the variable frequency control strategy has difficulties in designing resonant parameters,large transformer volume and electromagnetic compatibility. To overcome these problems in the frequency conversion control strategy,a hybrid control strategy of fixed-frequency bus voltage variation and phase shifting is proposed. By increasing the zero current turn-off range of the secondary-side switching transistor,the operating efficiency and power density of the converter are improved. The working process of the proposed control strategy and the soft-switching implementation conditions are analyzed,and the design method of resonant network parameters is proposed.
引文
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[2] 朱国荣,王浩然,肖程元,等.抑制燃料电池单相逆变系统低频纹波的波形控制方法[J].中国电机工程学报,2014,34(18):2936-2943.ZHU Guorong,WANG Haoran,XIAO Chengyuan,et al.Waveform control method for mitigation the low-frequency current ripple in the fuel cell single phase inverter system[J].Proceedings of the CSEE,2014,34(18):2936-2943.
[3] 顾亦磊,杭丽君,吕征宇,等.非对称结构多路输出LLC谐振变换器[J].中国电机工程学报,2006,26(5):82-87.GU Yilei,HANG Lijun,Lü Zhengyu,et al.Multi-ouput LLC resonant converters with asymmetrical structures[J].Proceedings of the CSEE,2006,26(5):82-87.
[4] STEIGERWALD R L.A comparison of half-bridge resonant converter topologies[J].IEEE Transactions on Power Electronics,1988,3(2):174-182.
[5] LEE I,MOON G.The k-Q analysis for an LLC series resonant converter[J].IEEE Transactions on Power Electronics,2014,29(1):13-16.
[6] 颜湘武,王杨,葛小凤,等.双管Buck-Boost变换器的带输入电压前馈双闭环控制策略[J].电力自动化设备,2016,36(10):65-77.YAN Xiangwu,WANG Yang,GE Xiaofeng,et al.Dual-loop control with input voltage feedforward for dual-switch Buck-Boost converter[J].Electric Power Automation Equitment,2016,36(10):65-77.
[7] BHAT A K.Anlyasis and design of LCL-type series resonant converter[J].IEEE Transactions on Industrial Electronics,1994,41(1):118-124.
[8] 潘海燕,贺超,蒋友明,等.高效率LLC谐振变换器变模式控制策略[J].电力自动化设备,2015,35(1):71-78.PAN Haiyan,HE Chao,JIANG Youming,et al.Efficient variant mode control of LLC resonant converter[J].Electric Power Automation Equipment,2015,35(1):71-78.
[9] LEE J Y,JEONG Y S,HAN B M.An isolated DC/DC converter using high-frequency unregulated LLC resonant converter for fuel cell applications[J].IEEE Transactions on Industrial Electronics,1994,41(1):118-124.
[10] 李浩昱,李振伟,赵雷,等.宽输入LLC谐振变换器多电平控制[J].电工技术学报,2017,32(4):48-56.LI Haoyu,LI Zhenwei,ZHAO Lei,et al.Mult-level control strategy of wide input LLC resonant converter[J].Transactions of China Electrotechnical Society,2017,32(4):48-56.
[11] JIN K,RUAN X.Hybrid full-bridge three-level LLC resonant converter-a novel DC-DC converter suitable for fuel-cell power system[J].IEEE Transactions on Industrial Electronics,2006,53(5):1492-1503.
[12] LIANG Z G,GUO R,WANG G Y,et al.A new wide input range high efficiency photovoltaic inverter[C]//IEEE Energy Conversion Congress and Exposition.Atlanta,USA:IEEE,2010:2937-2943.
[13] 陈东,梅念,孙谦浩,等.用于HVDC系统互联的高频模块化直流变压器优化控制策略[J].电力自动化设备,2019,39(1):27-32.CHEN Dong,MEI Nian,SUN Qianhao,et al.Optimization control strategy of high-frequency modular DC/DC transformer for HVDC system integration[J].Electric Power Automation Equipment,2019,39(1):27-32.
[14] CANALES F,BABOSA P,LEE F C.A wide input voltage and load output variations fixed-frequency ZVS DC/DC LLC resonant converter for high power applications[C]//IEEE Industry Applications Conference.Pittsburgh,USA:IEEE,2002:2306-2313.
[15] KWANG H Y,YOUNG J N,PHUM S,et al.LLC resonant converter with wide input voltage and load range at a fixed switching frequency [C]//IEEE Applied Power Electronics Conference and Exposition.Orlando,USA:IEEE,2012:1338-1342.
[16] 金科,阮新波.复合式全桥三电平LLC谐振变换器[J].中国电机工程学报,2006,26(3):53-58.JIN Ke,RUAN Xinbo.Hybrid full-bridge three-level LLC resonant converter[J].Proceeings of the CSEE,2006,26(3):53-58.
[17] 王皓,朱金大,侯凯,等.基于混合控制式交错并联LLC谐振变换器的充电模块研制[J].电力系统自动化,2017,41(7):108-113.WANG Hao,ZHU Jinda,HOU Kai,et al.Development of charging module based on interleaving paralled LLC resonant converter with hybrid control[J].Automation of Electric Power Systems,2017,41(7):108-113.