双有源桥DC-DC变换器线性自抗扰控制

Linear active disturbance rejection control of dual active bridge DC-DC converters

针对双有源桥DC-DC变换器单重移相控制电流应力大,采用传统PI控制动态特性差等问题,为同时优化变换器电流应力和动态特性,在扩展移相控制下,提出一种线性自抗扰控制结合直接功率控制的电流应力优化方案。通过建立扩展移相各个状态下的数学模型,推导出电流应力的全局最优解,将线性自抗扰控制器引入电压环,与直接功率控制相结合,输出传输功率标幺值至电流应力优化算法中,计算对应移相角。仿真和实验结果表明:新优化控制策略能在减小电流应力的同时提高变换器的动态响应能力。

Aiming at the high current stress and poor dynamic characteristics of the traditional PI control in single phase shift control of dual active bridge DC-DC converters, this paper proposes a current stress optimization scheme combining linear active disturbance rejection control(LADRC) with direct power control under the extended phase shift(EPS) control with a consideration of current stress and dynamic characteristics of the optimized converters. The global optimal solution of the current stress is derived by establishing a mathematical model under each state of the EPS. The LADRC is introduced into the voltage loop and combined with the DTC. The per unit value of the transmission power is output to the current stress optimization algorithm to calculate the corresponding phase shifting angle. The simulation and the experiment results show that the proposed optimal control strategy can improve the dynamic response of the converter while reducing the current stress.