基于效率优化的并联DAB变换器功率平衡控制

Power Balance Control Based on Efficiency Enhancement for Paralleled DAB Converter

输出并联双有源全桥(DAB)DC/DC变换器由于其优良性能而被广泛应用,其运行效率和响应速度至关重要。为改善输出并联DAB中各模块传输功率的均衡性,以效率优化作为基础,对并联DAB变换器功率平衡控制策略进行探究。通过结合电流应力优化计算与直接功率控制,可保证多个DAB模块传输功率保持均衡状态,同时有效提升变换器的运行效率。此外,该方法可有效抑制输入电压突变对输出电压脉动所造成的不良影响,促进变换器响应速度的提升;最后,搭建了碳化硅(SiC)金属-氧化物半导体场效应晶体管(MOSFET)的三模块变换器小功率实验样机,通过对比实验验证了该控制策略的有效性。

Output paralleled dual-active-full-bridge(DAB)DC/DC converter is widely used because of its excellent performance,and its operation efficiency and response speed are very important.A power balance control strategy with efficiency enhancement for output paralleled DAB converter is proposed to balance the power of each module.By combining the optimal calculation of current stress and direct power control,the transmission power of multiple DAB modules can be guaranteed to maintain a balanced state,and the efficiency of DAB converter can be improved.Further,this method can effectively suppress the adverse effect of the sudden change of input voltage on the output voltage,improve the response speed of the converter.Finally,a three-module converter small-scaled power prototype with silicon carbide(SiC)metal-oxide-semiconductor field-effect transistor(MOSFET)is built,and the proposed strategy is verified by comparative experiments.