基于微分平坦理论的两相交错并联Buck

Two-phase interlaced parallel Buck based on differential flatness theory

针对两相交错并联Buck系统在受到干扰时,输出波动较大,恢复时间较长的问题,基于微分平坦理论,提出了一种平坦控制策略。设计了微分平坦控制器,控制器分为两个部分:前馈控制器和反馈补偿器,前馈控制器可以抵消系统的非线性特性,使系统跟随期望的输出轨迹;反馈补偿器用于消除因干扰和系统的未建模部分所引起的系统输出偏离期望轨迹的现象。微分平坦控制器输出电压给定值变化时,能够在更短的时间内重新跟随系统期望输出,同时在干扰产生时,有更好的抗干扰能力。该控制器在提高系统动态特性方面,有一定的参考价值。

Aiming at the problem that the two-phase interleaved Buck system is disturbed,the output fluctuates greatly and the recovery time is longer.Based on the differential flat theory,a flat control strategy is proposed in this paper.A differential flat controller is designed,and the controller is divided into two parts:feed-forward controller and feedback compensator.The feed-forward controller can cancel the nonlinear characteristics of the system and make the system follow the desired output trajectory.The feedback compensator is used to eliminate the phenomenon that the system output deviates from the desired trajectory caused by interference and un-modeled parts of the system.When the differential flat controller output voltage is changed,it can re-follow the expected output of the system in a shorter time,and has better anti-interference ability when the interference occurs.The controller has certain reference value in improving the dynamic characteristics of the system.