基于Buck-Boost逆变器的离散滑模控制仿真研究

Simulation Research on Discrete Sliding Mode Control Based on Buck-Boost Inverters

为了获得比较理想的正弦输出电压,优化逆变器的动态性能,文中基于Buck Boost逆变器,采用了离散滑模变结构的控制策略。Buck Boost逆变器可以获得比直流输入电源高或低的交流输出电压,文中阐述了其工作原理,并结合状态方程,推导出滑模面的存在条件、到达条件和稳定条件,然后对电路参数、控制系数以及控制算法进行了设计。仿真结果表明采用离散滑模控制的Buck Boost逆变器对系统扰动和负载变化具有很强的鲁棒性,系统具有良好的动态响应。

In order to obtain excellent sinusoidal output voltage and optimize dynamic performance of inverters, discrete sliding mode control strategy based on buck-boost inverter is adopted in this paper. Buck-boost inverter can obtain AC output voltage higher than or lower than input DC voltage. The principle of buck-boost inverter is expounded in this paper, and reaching condition, existence condition and stability condition of the sliding mode surface are also derived from state equations, then the circuit parameters, control coefficients and control algorithm are designed. Simulation results indicate that buck-boost inverters provide good robustness to system disturbance and load change, and the system also has good dynamic response.