Buck型DC-DC变换器终端滑模PD控制设计

Terminal Sliding Mode PD Control Based on Buck Converter

为进一步提高Buck型DC-DC变换器的稳态性能和动态性能,将PD控制引入到Buck型DC-DC变换器终端滑模控制环节。通过基尔霍夫定律建立Buck电路的状态空间模型,实现Buck型变换器的基本电压调节功能,用PD控制优化终端滑模的滑模面形式,设计终端滑模控制器,使之满足Lyapunov稳定方程,并在Matlab中仿真对比分析终端滑模和终端滑模PD控制器下Buck电路的性能。仿真结果表明,所设计的终端滑模PD控制器具有良好的鲁棒性、稳定性和动态性能。与单纯的终端滑模控制相比,输出电压更接近于理想输出电压,具有更小的超调量和响应时间。

To improve the steady-state performance and dynamic performance of the Buck-type DC-DC converter,the PD control was introduced into the Buck-type terminal sliding mode control.The state space model of the Buck circuit was established following Kirchhoff's law to realize the basic voltage regulation function of the Buck converter.The sliding mode surface of the terminal sliding mode was optimized by PD control,the terminal sliding mode controller designed to satisfy the Lyapunov stability equation,and performance of the Buck circuit under terminal sliding mode and terminal sliding mode PD controller simulated and compared in Matlab.The simulation results show that the designed terminal sliding mode PD controller has good robustness,stability and dynamic performance.Compared to a single terminal sliding mode control,the output voltage is closer to the ideal output voltage with less overshoot and response time.