电动汽车双向DC/DC变换器的设计

Design of a Bidirectional DC/DC Converter

采用全桥谐振C-LCLC变换器和模糊PID控制的半桥Buck-Boost变换器,组成两级式双向DC/DC变换器拓扑;并根据等效模型计算出谐振元件参数,即变压器的匝比为1∶1,输入输出电压为400 V,谐振电感为100μH,谐振电容为2.53μF,半桥Buck-Boost变换器中的滤波电感为5000μH,滤波电容为12.7μF。仿真结果表明,全桥谐振C-LCLC谐振变换器输入电压与输出电压一致;模糊PID控制策略可有效降低充电状态下电压超调量,缩短调节时间,提高系统的抗扰动能力,说明所采用的设计工艺能有效提高电动汽车变换器的动态、稳态性能和抗扰动能力。

A two-stage bidirectional DC/DC converter topology is formed using a full-bridge resonant C-LCLC converter and a half-bridge Buck-Boost converter with fuzzy PID control,and resonant element parameters calculated based on the equivalent model,of which the transformer's turn ratio was 1∶1,the input and output voltage was 400 V,the resonance inductance was 100μH,the resonance capacitance was 2.53μF,the filter inductance in the half-bridge Buck-Boost converter was 5000μH,and the filter capacitance was 12.7μF.Simulation results show that the input voltage and output voltage of the full-bridge resonant C-LCLC converter are consistent;the fuzzy PID control strategy can effectively reduce the voltage overshoot in the charging state,shorten the adjustment time,and improve the anti-disturbance capability of the system.The electric vehicle converter can therefore effectively improve the dynamic and steady state performance and anti-disturbance ability of the electric vehicle converter.