DC-Bus Voltage Balancing Algorithm for Three-Level Neutral-Point-Clamped (NPC) Traction Inverter Drive With Modified Virtual Space Vector
DC-Bus Voltage Balancing Algorithm for Three-Level Neutral-Point-Clamped (NPC) Traction Inverter Drive With Modified Virtual Space Vector
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DOI：
10.1109/tia.2016.2566600
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发表时间：
2016-05
影响因子：
4.4
通讯作者：
A. Choudhury;P. Pillay;S. Williamson
中科院分区：
文献类型：
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作者：
A. Choudhury;P. Pillay;S. Williamson
提出了一种改进的基于虚拟空间矢量的三电平逆变器直流侧电压平衡策略。在该策略中，虚拟矢量的三相电流之和不必为零，并且在较宽的负载变化范围内保持两个电容电压的平衡。文中还利用最近的三电压矢量法推导了所有功率开关的占空比。由于减少了对中压矢量的使用，对于较低功率因数的负载，所提出的控制策略也可以显著地减小中点电压波动。文中还进行了详细的仿真和实验研究，以验证所提出的永磁同步电机直流侧电压平衡策略的有效性。随着调制指数的变化，电压和电流的谐波失真也随之出现。采用基于dSPACE的实时操作系统，对一台6.0kW面阵永磁同步电动机进行了实时控制。
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.