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首页> 外文期刊>IEEE Transactions on Industry Applications >DC-Bus Voltage Balancing Algorithm for Three-Level Neutral-Point-Clamped (NPC) Traction Inverter Drive With Modified Virtual Space Vector
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DC-Bus Voltage Balancing Algorithm for Three-Level Neutral-Point-Clamped (NPC) Traction Inverter Drive With Modified Virtual Space Vector

机译：具有修正虚拟空间矢量的三电平中性点钳位（NPC）牵引逆变器驱动的DC总线电压平衡算法

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摘要

A modified-virtual-space-vector-based dc-link voltage balancing strategy is proposed in this paper for a three-level inverter. In the proposed strategy, the summation of the three-phase currents for virtual vector needs not to be zero and it also keeps the two capacitor voltages balanced with wider range of load variations. The duty cycles for all the power switches are also derived in this paper using a nearest three-voltage vector scheme. Due to the reduced use of the medium voltage vectors, the proposed control strategy can considerably decrease the neutral-point voltage fluctuation for lower power-factor-based loads as well. Detailed simulation and experimental studies are also carried out to show the effectiveness of the proposed system with a dc-link voltage balancing strategy with permanent magnet synchronous machine. Voltage and current harmonic distortions are also presented with change in modulation index. A Dspace-based real-time operating system is used for real-time implementation with a 6.0-kW surface permanent magnet synchronous motor.
机译：针对三电平逆变器，本文提出了一种基于虚拟空间矢量的改进型直流环节电压平衡策略。在提出的策略中，虚拟矢量的三相电流之和不必为零，并且还可以使两个电容器电压保持平衡，并具有较大的负载变化范围。本文还使用最接近的三电压矢量方案推导了所有电源开关的占空比。由于减少了中压矢量的使用，因此所提出的控制策略还可以显着降低基于较低功率因数的负载的中性点电压波动。还进行了详细的仿真和实验研究，以证明所建议的系统与永磁同步电机的直流链路电压平衡策略的有效性。电压和电流谐波失真也会随着调制指数的变化而出现。基于Dspace的实时操作系统用于6.0 kW表面永磁同步电动机的实时实施。

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