基于Buck-Boost变换器的无源性研究
2023,31(9):274-282
摘要：Buck-Boost变换器在恒功率负载情况下可能会导致系统振荡，为保证系统稳定运行，文章采用端口受控的哈密顿模型设计一种新型无源复合控制器；首先利用正切函数改进非线性状态误差反馈控制，更新无源控制的内环控制器，获得期望电流值，进而提高的系统动态性能，减小静态误差；其次结合POPOV超稳定定理优化无源控制的外环控制器，保证无源控制在内部扰动或外部扰动情况下均能稳定输出；之后通过仿真将所设计的新型无源复合控制器与三种经典的无源控制方法比较得出：新型无源复合控制器不仅可以提高系统的抗干扰能力，还能解决超调与快速性无法协调的问题；最后利用实验平台验证文章所提算法的可实施性。
关键词：Buck-Boost变换器；恒功率负载；哈密顿模型；无源控制；非线性状态误差反馈
Study on Passivity of Buck-Boost Converter
Abstract：Buck-Boost converter may cause system oscillation under constant power load. In order to ensure the stable operation of the system, a new passive compound controller is designed based on the port-controlled Hamiltonian model. Firstly, the tangent function is used to improve the nonlinear state error feedback control, and the inner loop controller of passive control is updated to obtain the expected current value, so as to improve the dynamic performance of the system and reduce the static error. Secondly, POPOV's superstability theorem is used to optimize the outer loop controller of passive control to ensure that the output of passive control can be stable under internal disturbance or external disturbance. Then, by comparing the designed new passive composite controller with three classical passive control methods, it is concluded that the new passive composite controller can not only improve the anti-interference ability of the system, but also solve the problem that overshoot and rapidity cannot be coordinated. Finally, an experimental platform is used to verify the feasibility of the proposed algorithm.
Key words：Buck-Boost converter; Constant power load; Hamiltonian model; Passive control; Nonlinear state error feedback
收稿日期：2023-04-14
基金项目：浙江省自然科学基金
