三态直流升压变换器的微分平坦控制

Differential flat control of tri-state Boost converter

针对伪连续导电模式下三态Boost变换器在传统控制器作用下瞬态响应速度较慢的问题,提出了一种基于动态参考电流和微分平坦控制的策略。首先,利用状态空间平均法建立三态Boost变换器的数学模型;然后,选定状态变量和输入控制变量,判别系统是否满足微分平坦控制条件;最后,建立了基于动态参考电流和平坦控制方法的控制系统,其中电流环采用动态参考电流方法,电压环采用基于期望前馈输入控制量和误差反馈量的微分平坦控制方法。仿真结果表明,相对于传统PI控制器,该微分平坦控制系统的系统瞬态跟踪时间更短,在受到干扰时有更好的抗干扰能力,提升了系统的鲁棒性。

A strategy based on dynamic reference current and the differential flat system control is proposed to address the problem of the slow transient response of boost converters in pseudo-continuous conduction mode under the action of traditional controllers.Firstly,the mathematical model of the tri-state boost converter is established using the state space averaging method;Then,the state variables and input control variables are selected to determine whether the system meets the conditions of the differential flat system method;Finally,a control system based on dynamic reference current and the differential flat system control method has been established,with the current loop using dynamic reference current method and the voltage loop using the differential flat system control based on expected feedforward input control and error feedback.The simulation results show that when the interference occurs,the differential flat system control has better anti-interference ability and thus improves the robustness of the system,as compared with traditional PI controllers.