导抗网络双桥谐振DC-DC变换器具有高功率密度、高效率的特点，广泛应用于智能微网系统中的发电模块和储能模块。然而，在宽电压要求下，环流增高和丢失软开关造成的系统损耗增大，对变换器高效率运行产生严重影响。为此，本项目提出基于动态频率匹配调制的降损控制策略，实现变换器全范围高效稳定运行。主要内容包括：（1）通过在CLCLC型导抗网络中引入可调开关电容，构建谐振频率可调节的CLCLC型导抗网络双桥谐振变换器电路拓扑；（2）针对该拓扑结构，研究变换器工作机理，采用多谐波相量分析法，建立功率传输模型和损耗模型；（3）依据功率损耗模型，提出动态频率匹配调制方法，研究多目标优化的综合降损控制策略。本项目的实施对于发展变换器损耗优化控制理论、指导电力电子装备的系统设计和高效运行、促进储能及微网系统的创新发展具有重要意义。

Dual bridge resonant DC-DC converters (DBRC) are featured with high power density and high efficiency, which are favourable in power generation module and energy storage module of intelligent micro power grid system. However, soft-switching operation is easy to get lost under variation of input and output voltage, which may cause the increase of power loss and low system efficiency. In this project, a dynamic frequency matching modulation scheme is proposed to make the converter operate in high efficiency and stability. The main contents are organized as follows: (1) The new topology of DBRC with adjustable resonant frequency is obtained by combining the CLCLC immittance network and switch-controlled capacitor. (2) The converter is analyzed with multi-harmonic phasor approach, and a power loss model is build. (3) A dynamic frequency matching modulation scheme with total power loss minimization is developed. This research provides a new idea for the system design and high-efficiency operation of DC-DC converters, and it is of great significance for the innovation and development of energy storage and micro power grid system.