Voltage source and current source converters are used in industrial applications as either boost or buck converters for a defined power flow direction. These operational modes limit these converters to be utilized on their own in hybrid and electric vehicle (EV) applications. Z-source (impedance source) converters, on the other hand, have the capability to be operated as buck and boost converters to have a wide range of output levels. The boost ratio of the direct current link voltage of a Z-source converter is set by short-circuiting the phase legs of the converter and defining the overlap duration at each switching period. In order to have the optimum efficiency with the lowest possible total harmonic distortion, a modified space vector pulse width modulation method with an impedance network could be selected for closed-loop control of the quasi-resonant Z-source converter to drive permanent magnet synchronous motors (PMSMs). In this study, closed-loop vector-controlled drive systems built with two-level and three-level boosted voltage source converter topologies and two- and three-level quasi Z-source converters for field-oriented control of a PMSM in EV motor drive applications were compared under constant motor speed–constant load, constant speed–variable load and variable speed–constant load operating conditions.

中文翻译：

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电动汽车的电压源转换器和Z源转换器的比较

电压源和电流源转换器在工业应用中用作升压或降压转换器，用于定义的功率流向。这些工作模式限制了这些转换器只能在混合动力和电动汽车（EV）应用中单独使用。另一方面，Z源（阻抗源）转换器具有作为降压和升压转换器运行的能力，具有广泛的输出电平。通过短路转换器的相脚并定义每个开关周期的重叠持续时间，可以设置Z源转换器的直流链路电压的升压比。为了在尽可能降低总谐波失真的情况下获得最佳效率，可以选择具有阻抗网络的改进的空间矢量脉冲宽度调制方法，以对准谐振Z源转换器进行闭环控制，以驱动永磁同步电动机（PMSM）。在本研究中，构建了具有两级和三级升压电压源转换器拓扑以及两级和三级准Z源转换器的闭环矢量控制驱动系统，用于电动汽车电机PMSM的磁场定向控制在恒定电动机速度-恒定负载，恒定速度-可变负载和可变速度-恒定负载运行条件下对应用进行了比较。