Design and simulation of a modular multi-level converter for MVDC application

G. Mondal, R. Critchley, F. Hassan, W. Crookes
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引用次数: 36

Abstract

A modular converter structure for medium voltage DC (MVDC) applications is presented in this paper. The new converter structure is designed in such a way that, the modularity is available not only for voltage but also for current ratings, using the available devices. The new converter will be applicable for a wide range of medium voltage applications and using its modularity it also can be scaled up for high voltage applications. The proposed-converter control is described and the overall operation is explained through simulation. A simple active-reactive power control is utilized for the converter control. It has been highlighted, through simulation, that the proposed converter has a high degree of design flexibility introduced by its high number of redundant switching states. These redundancies are implemented for controlling the capacitor voltages of the converter modules. More importantly, they provide the converter with a DC and AC sides fault-handling capability; a function that is essential for an MV converter. It is explicitly shown that the converter can provide ancillary services to the grid during DC faults.
MVDC中模块化多级变换器的设计与仿真
本文提出了一种适用于中压直流(MVDC)应用的模块化变换器结构。新的转换器结构的设计方式是,模块化不仅适用于电压,也适用于额定电流,使用可用的器件。新的转换器将适用于广泛的中压应用,并利用其模块化,它也可以扩大到高压应用。本文对所提出的变换器控制进行了描述,并通过仿真说明了其总体运行情况。采用一种简单的有功功率控制方法对变流器进行控制。通过仿真表明,所提出的变换器具有高度的设计灵活性,这是由于其具有大量冗余开关状态。实现这些冗余是为了控制转换器模块的电容电压。更重要的是,它们为变换器提供直流和交流侧的故障处理能力;对中压变换器必不可少的功能。结果表明,变流器可以在直流故障时为电网提供辅助服务。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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