双有源桥DC-DC变换器三移相调制及其死区效应分析和补偿  

Three-Phase-Shift Modulation and Its Dead Band Effect Analysis and Compensation of Dual-Active-Bridge DC-DC Converter

作　　者：康薇 肖飞[1] 任强[1] 王瑞田[1] 张新生[1] Kang Wei;Xiao Fei;Ren Qiang;Wang Ruitian;Zhang Xinsheng(National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering,Wuhan 430033 China)

机构地区：[1]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

出　　处：《电工技术学报》2024年第6期1907-1922,共16页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51907199)。

摘　　要：针对双有源桥(DAB)变换器宽电压范围应用,该文研究一种全工况连续、表达形式统一、计算量小的三移相(TPS)调制策略,并分析其功率传输特性及软开关性能。结合工程应用中的非理想因素,对TPS调制不同开关模式下的死区效应及其边界进行研究,给出DAB宽电压范围运行时避免电压跌落和极性反转的约束条件。针对死区引入的移相比损失、软开关范围减小等问题,提出一种基于开关脉冲调整的死区补偿策略以补偿移相比损失,重新获取全工况软开关范围,降低死区引入的附加电流应力及损耗、提升效率。最后通过仿真和实验验证所提策略的有效性。Dual-active-bridge(DAB)converters are commonly adopted in large-capacity modular power electronic transformers(PET)due to their high-frequency galvanic isolation,symmetrical structure,and inherent soft switching performance.For renewable energy and energy storage equipment applications,the DAB converter operates in the wide input-to-output voltage range,requiring new modulation strategies with lower loss and lower current stress.Meanwhile,the nonideal issues,such as dead band effects,switching waveforms oscillation,and pulses delay,remain to be settled.For DAB converters operating in a wide voltage range,the existing multi-phase-shift modulation strategies still have large computation and discontinuous operating range problems.Moreover,the dead band effects need to be further analyzed,and the dead-time compensation strategies may not be suitable for the wide operating range.Therefore,this paper proposes a three-phase-shift(TPS)modulation strategy for a wide operating range and a dead-time compensation strategy.Firstly,the optimal algorithm of the wide voltage range TPS modulation strategy is presented,and its power transmission characteristic is evaluated.Based on the model of leakage inductance current,the electrical parameters of TPS modulation in full operating range could be obtained.The current stress characteristics are compared between the TPS modulation and single-phase-shift(SPS)modulation.The switching current model describes the soft switching characteristics in different switching modes.Secondly,considering the non-ideal factors,the dead band effects in different switching modes are elaborated,including phase-shift duty cycle loss,switching mode boundary change,soft switch performance failure,and voltage polarity reversal and voltage sag phenomena in the transformer primary side.Regarding the voltage distortion,by calculating the commutation process and switch states during the dead band,the boundary of voltage polarity reversal and voltage sag are derived.Thirdly,a dead-time compensation strategy bas

关 键 词：双有源桥变换器 宽电压范围运行 三移相(TPS)调制 死区效应 死区补偿 

分 类 号：TM46[电气工程—电器]