三相电压型逆变器的滑模控制律参数优化设计

Optimization Design of Law Parameters for Sliding Mode Control of Three-phase Voltage Inverters

针对三相电压型逆变器滑模控制中滑模函数和趋近律参数选取困难的问题,提出一种滑模控制律参数优化设计方法。首先,根据三相电压型逆变器的基本工作原理,建立了三相电压型逆变器的d-q数学模型。其次,将滑模变结构控制应用到三相电压型逆变器系统中,设计合理的滑模函数并采用等速趋近律推导出滑模控制律,再将滑模控制律带到三相电压型逆变器闭环系统,得到偏差的数学模型。根据系统跟随性能的要求,讨论并推导了滑模控制律中参数优化的选择公式。最后,利用PSIM仿真软件,搭建了三相逆变器的滑模变结构控制闭环系统,通过仿真实验验证了所提滑模控制律参数优化设计的合理性和可行性。

In view of difficulty in selecting sliding mode function and approximation law parameters in sliding mode control of three-phase voltage inverters,a method for optimizing law parameters is proposed.First the d-q mathematical model of three-phase voltage inverter is established according to its basic working principle.Second the sliding mode function is rationally designed and the control law is derived through the constant velocity approximation law by applying sliding mode variable structure control.Then the sliding mode control law is brought to the closed-loop system of the three-phase voltage inverter to obtain the mathematical model of deviation.According to the requirements of system following performance,the selection formula of parameter optimization in sliding mode control law is discussed and derived.Finally,the PSIM simulation software is used to build a closed-loop system for sliding mode variable structure control of three-phase inverter,and rationality and feasibility of the proposed design are verified by simulation experiments.