适用于镁海水电池的能量变换系统设计

本文设计了一种适用于镁海水电池供电的能量变换系统，针对镁海水电池输出特性软、电压低的问题，对传统非隔离型三端口变换器进行优化，使电压增益得到进一步提高。基于此变换器拓扑，考虑镁海水电池输出特性和变换器载荷特性，提出一种适用于载荷突变的DC/DC变换系统能量管理策略，通过控制能量在系统内任意两个端口间的流动，实现源、荷间功率动态平衡；同时，根据镁海水电池的输出特性，在系统能量管理中引入一种基于改进灰狼算法的最大功率点追踪方法，进一步提高了镁海水电池的能量转换效率。最后通过仿真和实验证明，载荷功率在0.36和1.2 W跳变时，变换器能相应完成模式间的切换，在保证输出电压稳定在12 V的前提下，实现了对输出电流30和100 mA的灵活控制，验证了该能量变换系统软硬件设计合理性。

Design of energy conversion system for magnesium seawater batteries

In this article, an energy conversion system suitable for the magnesium seawater batteries is designed. To address the problems of soft output characteristics and low voltage of magnesium seawater batteries, the conventional non-isolated three-port converter is optimized to improve the voltage gain. Based on this converter topology. Considering the output characteristics of magnesium seawater batteries and the load characteristics, an energy management strategy for DC/ DC converter system suitable for sudden load change is proposed. By controlling the flexible flow of energy between any two ports in the system, the dynamic power balance of source and load is achieved. Meanwhile, according to the output characteristics of magnesium seawater batteries, a maximum power point tracking method based on the improved grey wolf optimization is introduced into the system energy management, which further improves the energy conversion efficiency of the magnesium seawater batteries. Finally, simulations and experiments demonstrate that when the load power changes between 0. 36 and 1. 2 W, the converter can complete the mode switching accordingly. On the premise of ensuring the output voltage is stable at 12 V, the flexible control of the output current of 30 and 100 mA is realized, which verifies the rationality of the hardware and software design of the energy conversion system.