级联多电平并网逆变器简化模型预测控制研究

Research on Simplified Model Predictive Control of a Grid-connected Multilevel Cascaded Inverter

传统的模型预测控制(MPC)策略在实时控制过程中需要较多的时间进行预测和优化,因此在采样和输出之间具有一定的延时,故此处提出一种简化MPC策略。采用TMS320F28335型DSP作为控制器,以级联H桥多电平并网逆变器为控制对象,分析了该简化MPC策略下并网电流的稳态与动态性能。仿真和实验结果验证了该简化MPC策略应用在级联H桥多电平并网逆变器中的可行性。

In real-time control process,the traditional model predictive control （MPC） strategy requires more time for prediction and optimization.As a result,there will be a certain delay between sampling and output.In order to overcome the adverse impact of the delay on the system performance, a simplified MPC method is presented.In the experiment, a TMS320F28335 floating-point DSP acts as the controller and a cascaded H-bridge multi-level grid-connected inverter acts as the control object.The steady state and dynamic performances of grid-connected current for the proposed model predictive control method are investigated.Simulation and experimental results validate the feasibility of the proposed method for cascaded H-bridge multilevel grid-connected inverters.