Hybrid Phase Shift Modulation Scheme for Dual Active Bridge Bidirectional DC/DC Converter
李宇 1张鑫蕊 2税朝会 1黄剑琪 1龙鹏 1张津华1
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作者信息
1. 贵州万峰电力股份有限公司,兴义 562400
2. 国网湖北直流运检公司,宜昌 443000
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摘要
对双主动全桥DAB(dual active bridge)双向DC/DC变换器的调制方案进行了研究,DAB变换器的主要优势在于具有对称结构、双向潮流能力、宽软开关区域和灵活的控制能力等特点.控制这种拓扑结构最简单的方法是通过控制变换器原副边全桥之间的移相角来控制功率传输的方向和大小.然而在轻载条件下,当变换器的输入或输出电压变化较大时,会产生大量的无功功率,同时部分开关管的零电压开关ZVS(zero voltage switching)操作会丢失而直接导致转换效率变低.因此,为了提高DAB变换器的效率,提出了一种混合单移相调制PSM(phase shift modulation)方案,在保持控制简单的基础上,通过减小电感电流有效值,扩大软开关的范围,提高了变换器的效率.首先,通过让拓展移相 EPS(extended phase shift)、双移相 DPS(dual phase shift)以及三移相 TPS(triple phase shift)调制方案中的可控变量相等,从而形成了 4种不同的PSM方案.接着,对这些调制方案进行了稳态特征的比较分析,包括传输功率容量、电感电流水平以及软开关性能等.在此基础上,提出了一种混合PSM方案.最后,通过搭建实验平台验证了所提出调制方案的有效性和正确性.
Abstract
In this paper,the modulation scheme for a dual active bridge(DAB)bidirectional DC/DC converter is stud-ied.The main advantage of the DAB converter is that it has characteristics such as symmetrical structure,bidirectional power flow capability,wide soft switching range and flexible control capability.The simplest way to control this topology is to control the direction and magnitude of power transmission by adjusting the phase shift angle between the primary and secondary bridges.However,when the input or output voltage of the converter varies widely,a large amount of reac-tive power will be generated under light load conditions.Meanwhile,the zero voltage switching(ZVS)operation of part of switches cannot be maintained,which directly leads to a low conversion efficiency.Therefore,to improve the efficiency of the DAB converter,a hybrid phase shift modulation(PSM)scheme is proposed,which can reduce the inductor root-mean-square(RMS)current and extend the soft switching range on the basis of keeping the control simple,thereby improving the performance of the converter.First,by making the controllable variables in the extended phase shift(EPS),dual phase shift(DPS)and triple phase shift(TPS)modulation schemes equal,four different PSM schemes are obtained.Then,the steady-state characteristics of these modulation schemes are compared and analyzed,including their transmission power capacity,inductor current level and soft switching performance.On this basis,a hybrid PSM scheme is formulated.Fi-nally,an experimental platform was built to verify the effectiveness and correctness of the proposed modulation scheme.
关键词
双主动全桥变换器/软开关特性/电感电流有效值/单移相调制方案
Key words
Dual active bridge(DAB)converter/soft switch-ing characteristics/inductor root-mean-square(RMS)current/phase shift modulation(PSM)scheme
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