电池储能系统的双向DC/DC变换器控制策略研究

研究电网与蓄电池之间的电能变换接口装置,为改善变换器的性能,提出一种基于双重移相控制的电池储能系统的双向全桥DC/DC变换器。从理论上对双向全桥DC/DC变换器的工作特性进行了分析,以抑制电路中的回流功率为目标,根据系统的传输功率与高频变压器两侧的变比理论上推导最优移相控制量,简化移相控制量实现对双向DC/DC变换器实时控制,实现了被控量的稳定,传输效率的提高。最后,搭建的小功率实验样机表明:该控制策略可以有效降低功率传输中的回流功率。

Research on control strategy of bidirectional DC/DC converter for battery energy storage system

Studying interface device of power conversion between power grid and storage battery, in order to improve the performance of the converter, a bidirectional full bridge DC/DC converter based on dual-phase-shift control of battery energy storage system is proposed. Theoretically, after analyzing the working characteristics of the bidirectional full bridge DC/DC converter, according to the transmission power of the system and the ratio of the two sides of the high frequency transformer, the optimum phase variables is deduced. Simplified phase variables realized real-time control of bidirectional DC/DC converter. The dual-phase-shift control algorithm realized the stability of control quantity and improved the transmission efficiency of the converter on the basis of restraining the backflow power in the circuit. At last, A small power experimental prototype is built, the experimental results show that This control strategy can effectively reduce the backflow power in power transmission.