电动汽车双向变换器非线性控制研究

Electric Vehicle Bidirectional Converter Nonlinear Control Research

随着电动汽车的广泛使用,电网交流侧带来的大干扰对充电桩直流侧电压的抗干扰性造成不良影响,威胁电动汽车充电安全。为了实现干扰下快速的直流侧电压调节,针对电动汽车双向双有源桥式(DAB)DC/DC变换器提出了非线性控制策略。采用改进欧拉法得到更加精确的DAB变换器离散化模型,设计了非线性控制策略,从而提高抗干扰性,保证电动汽车在面临系统各种干扰问题时均保持稳定。最后通过实验证明了该控制策略的有效性。

With the widespread use of electric vehicles,the large perturbation caused by the AC side of the power grid will adversely affect the voltage anti-interference of the DC side of the charging pile,which will threaten the charging safety of electric vehicles.In order to realize fast voltage regulation on the DC side under large perturbation,a nonlinear control strategy is proposed for the dual active bridge(DAB)DC/DC converter for electric vehicles.The improved Euler method is used to obtain a more accurate DAB converter discrete model,and a nonlinear control is designed to improve the anti-interference property and ensure the stability of electric vehicles in the face of various system perturbations.Finally,the effectiveness of the control strategy is verified through experiment.