三相并网逆变器状态反馈模型预测控制策略

Model Predictive Control With State Feedback of Three-phase Grid-connected Inverter

在三相并网逆变器中,由于传统的电流模型预测控制(MPC)系统中存在建模误差等因素,导致评估函数选出的预测值在应用时不一定仍具最优性。基于传统比例积分(PI)调节对给定电流良好的跟踪性基础上,提出了一种具有状态反馈、误差补偿的MPC算法,根据前一时刻电流预测值与实际电流采样值的偏差补偿当前时刻预测函数模型系统的输出,从而减少由建模误差造成的预测值与实际值的偏差。仿真和实验结果表明:加入反馈校正后,模型电流预测算法的控制性能大大提高,有效减少了谐波含量。从而验证了该方案的可行性和有效性。

In the three-phase grid-connected inverter,the traditional current model predictive control（MPC） system does not take the modeling errors and other factors into account, leading to that the prediction value selected by the evalu- ation function is not always optimal in the implementation of control.A MPC algorithm with state feedback and error compensation is designed based on the traditional proportional integral （PI） regulation for good tracking of given cur- rent.The output of the current prediction time model is compensated by the deviation between the predicted value of the previous time and the actual value, thereby greatly reducing the deviation between the predicted value and the actual value caused by the modeling error.The results of simulation and experiment show that the control performance of the model current prediction algorithm is greatly improved and the harmonic content is reduced effectively after adding the feedback correction.The feasibility and effectiveness of the proposed scheme are verified.