【摘要】 以LCL三电平并网逆变器为研究对象，针对传统模型预测控制下开关频率过高的问题，提出一种基于滞环的单变量模型预测控制策略。利用滤波电容电压反馈的有源阻尼控制算法，对逆变器侧电流参考值预测模型进行改进，建立电流输出值以及直流侧中点电位的预测模型，对逆变器侧电流在未来时刻的参考值、输出值以及中点电位分别进行预测。利用代价函数评估跟踪误差，综合考虑代价函数的最优值与滞环约束，以确定作用于系统的最佳开关矢量。仿真与实验结果验证了所提出的控制策略的合理性与有效性。更多还原

【Abstract】 Taking LCL three-level grid-connected inverter as the research object, aiming at the problem of high switching frequency under traditional model predictive control, a single variable model predictive control strategy based on hysteresis is proposed. Using the active damping control algorithm of filter capacitor voltage feedback, the reference value prediction model of inverter-side current is improved, and the prediction models of current output value and DC-side neutral point potential are established. The reference value, output value and neutral point potential of inverter-side current in the next time are predicted, respectively, and the tracking error is evaluated by the cost function. Considering the optimal value of cost function and also hysteresis constraint, the optimal switching vector is determined. Simulation and experimental results verify the correctness and effectiveness of the proposed control strategy.更多还原