High level performance models of double-star MMC converters

2017 IEEE 8th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2017-07-07 DOI:10.1109/PEDG.2017.7972559

H. Pereira, E. Kontos, R. Teodorescu

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引用次数: 2

Abstract

The development of Modular Multilevel Converter (MMC) technology is a breakthrough in the field of High and Medium Voltage applications. In general, simulations are needed to study a new application and to analyze the impact of a new converter in power systems. Thus, accurate models able to represent the dynamics present in the converter are required. This work aims to compare two MMC average models and one average model with three modulation strategies in order to propose high level models, able to represent the MMC dynamics, such as the injected active and reactive power, and the SMs capacitor voltages, without the necessity of switching models. A case study is presented considering a Double Star (DS) MMC, connected in a distribution system during an unbalanced voltage sag. The results shows that considering MMC average models only the steady state can be represented. On the other hand, when the modulation techniques are considered together with the MMC average models, it is possible to represent the capacitor voltage ripples and the grid current ripples increasing slightly the necessary processing time.

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双星MMC转换器的高性能模型

模块化多电平变换器(MMC)技术的发展是中高压应用领域的一个突破。一般来说，研究一种新的应用和分析一种新的变换器在电力系统中的影响都需要进行仿真。因此，需要能够表示转换器中存在的动态的精确模型。本研究旨在比较两种MMC平均模型和三种调制策略下的一个MMC平均模型，以便在不需要切换模型的情况下，提出能够表示MMC动态的高级模型，例如注入的有功功率和无功功率以及SMs电容器电压。给出了在不平衡电压暂降期间连接配电系统的双星(DS) MMC的实例研究。结果表明，MMC平均模型只能表示稳态。另一方面，当调制技术与MMC平均模型一起考虑时，可以表示电容器电压纹波和电网电流纹波，这稍微增加了必要的处理时间。

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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来源期刊

2017 IEEE 8th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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