摘要
针对传统的控制策略动态性能不足,电压达到稳态值较慢,受到负载切换扰动较大及SiC mosfet反向导通压降较大等缺点,提出了一种对CLLC谐振变换器的自抗扰控制策略,在无需对CLLC谐振变换器精确建模的情况下,建立扩张状态观测器和设计PD控制器,将副边设计为有源整流桥,以提升动态响应性能,降低超调量,减小超调时间,减少谐波含量,在不增加额外器件的情况下减小损耗,进一步提升变换器的功率密度,降低了二极管压降对于整流电压的不利影响,对输出电压进行参数优化.设计了一个输入为350 V,输出为300 V,功率3 kW的双向全桥CLLC谐振变换器,以罗姆公司sct3060al-e SiC mosfet的数据为例,运用该方法通过simulink对变换器进行正向、反向仿真验证.结果表明,与传统控制策略对比仿真,其超调量从3.3%降低至1.6%,且超调时间更短,系统谐波含量更少.验证了对于CLLC谐振变换器采用自抗扰控制相比于传统控制策略具有超调量小、调节时间短、输出电能质量好的优点.
The driving conditions of new energy vehicles are more complicated,and the two-way DC/DC converters for vehicles are required to have higher dynamic response performance.Aiming at the shortcomings of traditional control strategies such as insufficient dynamic performance,slower voltage reaching the steady-state value,greater disturbance of load switching,and greater reverse voltage drop of SiC mosfet,an auto disturbance rejection control strategy for CLLC resonant converters is proposed.An extended state observer is established and a PD controller is designed without the need for accurate modeling of CLLC resonant converter.The secondary side is designed as an active rectifier bridge to improve the dynamic response performance,reduce overshoot,overshoot time and harmonic content.The power density of the converter is further improved by reducing the loss without adding additional devices,and the adverse effect of diode voltage drop on the rectifier voltage is reduced.The output voltage parameters are optimized.A bidirectional full-bridge CLLC resonant converter with an input of 350 V,an output of 300 V,and a power of 3 kW is designed.Taking the data of Rohm's sct3060al-e SiC mosfet as an example,this method is used to forward and reverse the converter through simulink Simulation.The results show that compared with the traditional control strategy,the overshoot is reduced from 3.3%to 1.6%,and the overshoot time is shorter.The system has less harmonic content.Compared with the traditional control strategy,the use of auto-disturbance rejection control for the CLLC resonant converter has the advantages of small overshoot,short adjustment time and good output power quality.
作者
王涛
罗文广
WANG Tao;LUOWenguang(School of Electric and Information Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Key Laboratory of Automobile Componment and Vehicle Technology(Guangxi University of Science and Technology),Liuzhou 545006,China)
出处
《广西科技大学学报》
2021年第2期33-40,64,共9页
Journal of Guangxi University of Science and Technology
基金
国家自然科学基金项目(61563006)
广西自然科学基金重点项目(2020GXNSFDA238011)资助.
关键词
CLLC谐振变换器
自抗扰控制
SIC器件
软开关
CLLC resonant converter
auto disturbance rejection control
SiC device
soft switching
