基于优化代价函数的三电平ANPC并网逆变器电流预测控制方法
Current predictive control method of three-level ANPC grid-connected inverter based on optimized cost function
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摘要: 针对传统三电平有源中点钳位（ANPC）并网逆变器有限控制集模型预测控制存在的计算流程复杂、中点电压波动较大、输出电流谐波较大的问题，提出了一种基于优化代价函数的三电平ANPC并网逆变器电流预测控制方法.该方法简化了传统模型预测控制方法中建立直流侧中点电压偏移量ΔUdc与三相开关状态Sx中间变量的步骤，在静止αβ坐标系下，利用负载电流i、ΔUdc与Sx之间的关系直接建立数学模型，通过对27种开关状态的实时计算，确定最优输出开关状态.仿真和实验结果表明，该方法有效降低了电流谐波畸变率，达到了抑制中点电压波动的效果.Abstract: Aiming at the problems of complicated calculation process, large neutral pointe potential fluctuation and large output current harmonic of the traditional three-level ANPC grid-connected inverter limited control set model predictive control, a current control method of three-level ANPC grid-connected inverter based on optimized cost function was proposed. This method simplified the steps of establishing the intermediate variable of the DC side mid-point voltage offset ΔUdc and the three-phase switching state Sx in the traditional model predictive control method.Under the static αβ coordinate system, the relationship between load current i, ΔUdc and Sx was used to directly establish a mathematical model.Through the real-time calculation of 27 switch states, the optimal output switch state was selected.Simulation and experiment result showed that the method effectively reduced the total harmonic distortion rate and achieved the effect of suppressing midpoint voltage fluctuations.
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