Hybrid Control for Bidirectional Z-Source Inverter for Locomotives

V. Vijayan, S. Ashok
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引用次数: 1

Abstract

Electric traction uses three phase locomotives in main line services. Three phase locomotives consist of voltage source inverters for driving the traction motors. This paper proposes a hybrid algorithm for bidirectional Z-source inverters in accelerating region of operation of locomotives. The speed control method adopted is same as that in the existing three phase locomotives which is variable voltage variable frequency. Bidirectional Z-source inverter is designed for getting the same output power as in voltage source inverter fed locomotives. Simulation is done in all regions of traction speed curve, namely, acceleration, free running, and braking by regeneration. The voltage stress across the devices and modulation index are considered while analyzing the proposed control algorithm. It is found that the modulation index remains at a high value over the entire range of frequencies. Due to the higher value of modulation index the harmonics in the inverter output voltage is reduced. Also the voltage stress across devices is limited to a value below the device rating used in the present three phase locomotives. A small scale prototype of the bi-directional Z-source inverter fed drive is developed in the laboratory and the hybrid control was verified in the control topology.
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机车双向z源逆变器的混合控制
电力牵引在干线服务中使用三相机车。三相机车由驱动牵引电动机的电压源逆变器组成。提出了一种用于机车运行加速区双向z源逆变器的混合算法。所采用的调速方式与现有三相机车相同,均为变压变频调速。双向z源逆变器是为获得与电压源逆变器供电机车相同的输出功率而设计的。对牵引速度曲线的各个区域进行了仿真,即加速、自由运行和再生制动。在分析控制算法时,考虑了器件间的电压应力和调制指标。在整个频率范围内,调制指数保持在一个高值。由于调制指数值较高,逆变器输出电压中的谐波降低。此外,装置间的电压应力也被限制在低于目前三相机车所使用的装置额定值的范围内。在实验室研制了双向z源逆变馈电驱动的小型样机,并在控制拓扑上对混合控制进行了验证。
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