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Reduced DC voltage source flying capacitor multicell multilevel inverter: analysis and implementation

机译：降低直流电压源的飞跨电容器多单元多电平逆变器：分析与实现

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Voltage source multicell multilevel converters (VSMMCs) have been extensively exploited in medium-voltage highpower fed industrial applications. One of the typical breeds of the VSMMCs is flying-capacitor multicell converter (FCMC). This study presents an improved configuration for FCMCs, accompanied by its analysis, modelling and implementation. The main advantage of the proposed converter, in comparison with the conventional one, is that the number and voltage rating of the required dc voltage sources are halved in the improved topology which results in reducing the cost, size, installation area and weight of the FCMCs effectively. This amelioration is attained by adding four power switches to the conventional topology of an FCMC without making any amendments to the number and voltage rating of high-frequency power-switches and flying capacitors (FCs). The proposed switching and control methodology for the adopted FCMC is based on the phase-shifted carrier pulse width modulation technique with applying some amendments; therefore the natural balancing phenomenon of the FC voltages, one of the critical advantages of the FCMCs, is preserved in the proposed VSMMC. Experimental measurements taken from the 3-cell-four-level and 4-cell-five-level laboratory prototype systems of the proposed converter are presented in order to validate and corroborate the effectiveness and advantages of the proposed topology, its switching and suggested control strategy. Furthermore, experimental studies are accomplished on an 8-cell-nine-level prototype system of the proposed FCMC to peruse its feasibility and viability for higher number of cells and voltage levels. In addition, comparison of the proposed converter with the other types of multilevel converters is carried out to underline the advantages of the proposed structure profoundly.
机译：电压源多单元多电平转换器（VSMMC）已在中压大功率馈电工业应用中得到广泛利用。 VSMMC的典型品种之一是飞电容多电池转换器（FCMC）。这项研究提出了一种改进的FCMC配置，并对其进行了分析，建模和实施。与常规转换器相比，该转换器的主要优点在于，在改进的拓扑结构中所需的直流电压源的数量和额定电压降低了一半，从而降低了FCMC的成本，尺寸，安装面积和重量有效。通过在FCMC的常规拓扑结构中增加四个电源开关，而无需对高频电源开关和飞跨电容器（FC）的数量和额定电压进行任何修改，即可实现这种改进。所采用的FCMC所建议的开关和控制方法是基于相移载波脉宽调制技术，并进行了一些修改。因此，建议的VSMMC中保留了FC电压的自然平衡现象，这是FCMC的关键优势之一。提出了从拟议转换器的3单元-4级和4单元-5级实验室原型系统获取的实验测量值，以验证和证实所提议的拓扑，切换和建议的控制策略的有效性和优势。 。此外，在拟议FCMC的8单元九级原型系统上完成了实验研究，以研究其在更多单元和更高电压水平下的可行性和可行性。另外，将所提出的转换器与其他类型的多电平转换器进行比较以深刻地强调所提出的结构的优点。

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    《Power Electronics, IET》 |2014年第2期|439-450|共12页
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