高频隔离型双向直流变换器是级联电池储能系统的关键部件,应当满足宽电压增益范围、高工作效率的要求。在级联电池储能系统中,针对双有源桥（dual active bridge,DAB）变换器在宽增益范围下由于回流功率及开关时刻大电流导致效率降低的问题,在三移相（TPS）调制策略的基础上,提出一种以总损耗为优化目标,基于内点法的优化调制策略。构建了DAB在不同增益下统一的损耗模型,在保证开关管软开通（ZVS）的基础上,根据不同的电池输出电压（OCV）,利用内点法得到移相角的最优值。分析电感值与开关频率对整个电压增益范围平均效率的影响,为电路参数设计提供参考。同时,构建5 kW小功率实验平台,验证了优化调制策略的有效性。
Abstract
The high-frequency isolated bidirectional DC-DC converter is a key component of cascaded battery energy storage system, which should meet the requirements of wide voltage gain range and high efficiency.In the cascade battery energy storage system, aiming at the problem of efficiency reduction of dual active bridge （DAB） under wide gain range due to backflow power and high current at switching time, on the basis of three phase shift （TPS） modulation strategy, an optimized modulation strategy based on interior point method is proposed, which takes the total loss as the optimization objective. The proposed strategy constructs a unified loss model of DAB under different gains. On the basis of ensuring the soft switching （ZVS） of the switching devices, the interior point method is used to obtain the optimal value of phase shift angle according to different battery open circuit voltage （OCV）. The influence of inductance value and switching frequency on the average efficiency of the whole voltage gain range is analyzed, which provides a reference for DAB parameter design. A 5 kW low-power experimental platform was constructed to verify the effectiveness of the optimized modulation strategy.
关键词
光伏电站 /
电池储能系统 /
直流变换器 /
调制策略优化 /
电路参数优化
Key words
PV power station /
battery energy storage system /
DC-DC converters /
modulation strategy optimization /
circuit parameters optimization
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基金
上海市优秀学术/技术带头人计划（20XD1430700）
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