三相两电平逆变器状态方程模型预测控制方法研究

Research on Model Predictive Control Based on State Equation of Threephase Two-level Inverter

本文以三相两电平逆变器为研究对象,提出了一种基于其状态方程的模型预测控制方法。在αβ坐标下,构建两电平逆变器的状态方程,构建控制系统预测模型,并根据预测控制器的优化性能指标对电压矢量进行在线评估,选择最优的开关状态信号,从而实现了给定电流参考值的快速跟踪。在MATLAB/SIMULINK上,对模型预测控制和传统控制策略分别进行对比仿真分析,结果表明:模型预测控制策略能够准确地跟踪给定参考值,预测控制完成i_α和i_β电流的内部解耦后,动态响应很快,具有良好的控制性能,验证了该方案的可行性和正确性。

For the three-phase two-level inverter is proposed model predictive control method based on the equationof state. In αβ coordinate, we construct two-level inverter state equation, build predictive model control systems, andoptimize performance based on predictive controller for online evaluation of the voltage vector, the optimum switchingstate signal, enabling to given fast-track current reference values. On MATLAB/SIMULINK model predictive controland simulation of SVPWM control were compared,the results showed： model predictive control algorithm could accuratelytrack a given reference value, predictive control after the completion of the internal ia and ip current decoupling,dynamic response quickly, and have good control performance, which proves the feasibility of the scheme and correct.