近年來電動車的市場需求愈發茁壯，推出各式各樣的電動車，其中一部份的車型是往高電壓的方向發展，而三階驅動架構能夠很好的解決電池的高壓帶來的影響，降低開關元件的耐壓需求，本文選用的架構為中性點嵌位式的三階三相驅動架構。由於三階的驅動架構使用的開關元件數目為一般二階架構的兩倍，並且含有電壓中性點，若仍然使用一般常見的驅動控制法，如磁場導向控制，會使開關切換損失上升，也無法使中性點平衡。因應以上問題，所以將模型預測控導入馬達驅動控制架構中當中。而其中一種結合馬達控制與模型預測控制的方式便是馬達模型預測電流控制，透過預測電流的方式來決定開關狀態的變化，捨棄一般磁場導向控制所需的脈波調變，使得開關切換的頻率能大幅度下降，並且在過程中顧及中性點的平衡，使其不會發散。而且三階電路本身所提供電壓向量自由度的提升，能夠更好的改善當取樣頻率不夠高時，所導致的轉矩漣波或是電流諧波的上升，達到維持低轉矩漣波和低電流諧波，並且降低開關切換頻率的效果。

This paper proposes a control method for three-level inverter combined with model predictive control. It reduces the withstand voltage of the switching element, and also lower the switching frequency so as to minimize losses. The method of neutral point balance is also proposed in this paper, to address the issue of motor stopping operation due to three-phase imbalance. In recent years, to reduce the volume and heat loss of electric vehicle batteries, some engineers has resorted to voltage increase in order to reduce the operating current while retaining same power. As the voltage increases, the withstand voltage specification of the switching element also increases. In this paper, a solution to use neutral point clamped three-level three-phase circuit to solve this problem is presented. This approach is also combined with model predictive current control to modulate the switching element. The balance between current commutation and neutral point is determined by calculating the cost and at same time solve the problem of switching frequency. Finally, comparisons were made between 2L-MPCC, 3L-MPCC and FOC to verify their effects.

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