基于模糊PID控制的双向DC/DC变换器研究

Study on Fuzzy PID Control for Bidirectional DC/DC Converter

中文关键词:  双向DC/DC变换器  模糊PID控制  蓄电池  非线性控制

英文关键词:bidirectional DC/DC converter  fuzzy PID control  battery  nonlinear control

中文摘要:

      双向DC/DC变换器是指在保持变换器两端的直流电压极性不变的情况下，根据实际需要完成能量双向传输的直流变换器。它在直流不间断电源系统、分布式电站、电动汽车以及太阳能电池阵中有广泛的应用。通过对双向半桥变换器的分析，并将其与蓄电池相结合使用，完成能量的双向传输和电池能量对电网的回馈。由于DC/DC变换器在升降压的过程中产生的严重的非线性问题，在控制方案上，采用模糊PID控制的电压、电流双闭环控制。仿真表明，与传统的PID控制相比，该控制方案有效提高了变换器的鲁棒性，减小输出电压波动，能够实现能量的双向流动。

英文摘要:

      Bidirectional DC/DC converter is a bidirectional energy transmission for keeping the converter on both DC voltage polarity according to the actual needs,and has wide application in DC UPS systems,distributed power station,electric cars and solar battery array.Based on the analysis of the bidirectional half bridge converter which is combined with battery,the bidirectional transmission of energy and battery energy back to the grid are completed.To solve the serious nonlinear problem in the process of lifting pressure,a control scheme which uses the fuzzy PID control while voltage and current in double closed-loop control,is adopted.Simulation results show that compared with the traditional PID control,the proposed scheme effectively improves the robustness of the converter,reduces the output voltage fluctuation,the mutual floating of energy can be achieved.