All Mode Small Signal Model and Controller of Three-Level DC/DC Converter

doi:10.7652/xjtuxb201306019

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All Mode Small Signal Model and Controller of Three-Level DC/DC Converter

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- All Mode Small Signal Model and Controller of Three-Level DC/DC Converter
- Vol. 47, Issue 6, Pages: 109-116(2013)
- 作者机构：
  
  海军工程大学舰船综合电力技术国防科技重点实验室,武汉,430033
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201306019
  CLC： TM46
- Online First：10 June 2013，
  
  Published：2013
- 稿件说明：
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All Mode Small Signal Model and Controller of Three-Level DC/DC Converter[J]. 2013, 47(6): 109-116.
DOI：

All Mode Small Signal Model and Controller of Three-Level DC/DC Converter[J]. 2013, 47(6): 109-116. DOI： 10.7652/xjtuxb201306019.

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。

Abstract

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.

关键词

Keywords

references

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