基于滑模预测的并网逆变器电流控制研究

Study of Current Control for Grid-connected Inverters Based on Sliding Mode Prediction

该文提出了一种在两相静止αβ坐标系中基于离散滑模预测理论的三相并网逆变器的电流控制方法。首先,分别建立三相并网逆变器在两相静止αβ坐标系和两相旋转dq坐标系下的模型,分析电流给定信号在两种坐标系下的关系。然后构建滑模预测模型和参考轨迹,通过反馈校正、滚动优化来设计二次型性能指标函数,得到非切换型滑模控制器,实现三相并网逆变器的电流控制。通过Matlab/Simulink进行仿真验证,仿真结果证明了了理论分析的正确性和有效性。

This paper proposed a current control method in 琢茁stationary frame of three phase grid-connectedinverter based on sliding mode.First,modes of grid-connected inverters in 琢茁refrence frame and dqsynchronous frame were established,and the relationship of given current signal was analyzed.Then,slidingpredictive model and sliding refrence trajectory were designed.Through using feedback correction and recedingoptimization,quadratic index function was introduced,and non-switchable sliding mode controllerwas derived.Finally,current control of grid-connected inverters was achieved.Simulation results with Mtalab/Simulink demonstrated the correctness and effectiveness of the proposed control strategy.