摘要
为了设计性能优良的直流变换器稳压输出控制器,在分析三电平H桥直流变换器的电路拓扑和移相PWM原理的基础上,分别给出了一个开关周期内电流连续模式(CCM)和电流断续模式(DCM)下变换器的所有工作模态,并基于状态空间平均法和开关网络平均法建立了变换器在两种模式下的小信号数学模型,并通过仿真验证了模型的正确性。基于小信号数学模型,设计了三电平H桥直流变换器的双闭环模式自适应比例积分(PI)控制器,并结合传统双闭环PI控制器进行了对比试验研究。结果表明:模式切换是造成系统输出动态性能不好的原因,而新型控制器能够通过模式检测实时调整控制器参数,所以比传统控制方法在突然加载过程中的输出电压最大跌落减小46.6%,动态性能得到提高。
To design a preferable controller for the three-level H-bridge DC/DC converter, the topology of the circuit and principles of the converter with phase-shift PWM control are analyzed, so all the working modes both in CCM and DCM period get visible, the small signal models are thus established in CCM and DCM with average state space method and average switched network method, and their correctness is verified by the simulations. Following the small signal models, a double loop PI mode adaptive controller is designed. The comparative experiments for the new controller and the conventional PI one show that the changed mode results in a bad dynamic output, and the new controller adjusts the parameters instantaneously by mode examination. The output voltage droop of the new controller reduces by 46.6% compared with the common PI controller case under sudden loading.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2013年第6期109-116,共8页
Journal of Xi'an Jiaotong University
基金
国家重点基础研究发展计划资助项目(2012CB215103)
国家自然科学基金创新研究群体基金资助项目(50721063)
新世纪优秀人才支持计划资助项目(NECT-11-0871)
关键词
三电平H桥
移相脉冲宽度调制
小信号模型
控制
three-level H-bridge
phase-shift pulse width modulation
small signal model
control
