双有源桥DC-DC暂态直流偏置分析和抑制策略研究

doi:10.11985/2018.07.002

摘要/Abstract

摘要：

基于双有源桥DC-DC变换器,以双移相控制原理为基础,分析负载瞬变时引起变压器交流部分出现直流偏置的原因,在不增加隔直电容等额外硬件条件下,提出基于不对称外移相下的双移相数字控制策略,使用基于预测电流控制的单PI闭环控制系统,不仅满足了控制要求,还解决了多PI控制环路控制参数整定困难等难题。数字仿真和样机实验结果表明,本文直流偏置的抑制均取得了很好的效果,为单相电压源型双有源桥DC-DC变换器实现航空电气系统储能系统最优控制提供了很好的理论及实验依据。

关键词: 双有源桥DC-DC, 直流偏置, 不对称移相控制, 预测电流控制

Abstract:

Based on the principle of dual phase shift control, the DC bias appearing in high frequency transformer’s ac current caused by the load transient is analyzed in dual active bridge converter(DAB). Without any extra hardware, such as block DC capacitor, the dual phase shifting digital control strategy based on the asymmetric phase is put forward. By using a single PI closed loop control system based on predictive current control, the control requirements for suppression of DC bias current not only can be met, but also many difficult problems such as PI control loop control parameters setting can be solved. The results of simulation and experiment show a good perform on the suppression of DC bias, and this methods further provide a good theoretical and experimental basis for the single-phase voltage source type dual active bridge DC-DC converter to realize the optimal control for storage energy system.

Key words: Dual active bridge DC-DC, DC bias current, asymmetric phase shift control, predictive current control

中图分类号:

TM315

雷涛,李龙春,邬岑颖,张晓斌. 双有源桥DC-DC暂态直流偏置分析和抑制策略研究[J]. 电气工程学报, 2018, 13(7): 8-15.

Lei Tao,Li Longchun,Wu Cenying,Zhang Xiaobin. Study of Transient DC Bias Analysis and Suppression Methods in Dual Active Bridge Converter[J]. Journal of Electrical Engineering, 2018, 13(7): 8-15.

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参数	额定值	参数	额定值
高压侧电压V₁/v	270	电感L/μH	12
低压侧电压V₂/v	28	负载阻值R/Ω	1.568
高压侧电容C₁/μF	470	输入等效阻值R_s/Ω	0.1
低压侧电容C₂/μF	1 000	开关频率/kHz	40
内移相占空比D₁	0.33	外移相占空比D₂	0.6