提高了M2AC直接AC/AC转换的操作灵活性

IF 3.9 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Anjana Wijesekera;Gregory J. Kish
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引用次数: 0

摘要

模块化多电平ac/ac转换器(M2AC)是最近提出的用于直接ac/ac转换的部分功率处理拓扑,可以在单频交流电源系统中调节电压幅度和相角,类似于电力电子自耦变压器。然而,先前的研究仅限于调查有功功率传输和基本操作特征。本文通过提出M2AC的三个操作灵活性增强来解决这一差距:1)适应需要独立控制有功和无功功率的实际潮流场景,2)消除大型直流链路电容器以实现完全模块化和可扩展的架构,以及3)结合类似于交流断路器功能的完全故障阻塞。对不同M2AC设计变量的基本工作原理和故障阻塞特性进行了深入研究,并进行了比较分析,以量化与背靠背模块化多电平转换器相比的潜在半导体节省作为基准。结合有功和无功潮流管理和内部电容器电压电池平衡的变换器控制被开发。通过仿真研究验证了M2AC的稳态和瞬态运行以及故障阻断能力,并通过实验室规模的250 Vpk, 1 kVA样机进行了进一步的实验测试。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Improved Operational Flexibility of the M2AC for Direct AC/AC Conversion
The modular multilevel ac/ac converter (M2AC) is a recently proposed partial power processing topology for direct ac/ac conversion that can adjust voltage magnitudes and phase angles in single-frequency ac power systems, analogous to a power electronic autotransformer. However, prior studies have been limited to investigating only active power transfers and basic operating features. This article addresses this gap by proposing three operating flexibility enhancements for the M2AC: 1) accommodating practical power flow scenarios where independent control of active and reactive powers is needed, 2) eliminating large dc-link capacitors to realize a fully modular and scalable architecture, and 3) incorporating full fault blocking akin to ac circuit breaker functionality. The fundamental operating principles and fault-blocking characteristics are thoroughly studied for different M2AC design variants, and a comparative analysis is conducted to quantify potential semiconductor savings in comparison to the back-to-back modular multilevel converter as a benchmark. Converter controls incorporating active and reactive power flow management and internal capacitor voltage cell balancing are developed. The M2AC’s steady-state and transient operation and fault-blocking capabilities are validated through simulation studies and further confirmed by experimental tests using a laboratory-scale 250 Vpk, 1 kVA prototype.
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来源期刊
CiteScore
8.60
自引率
0.00%
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审稿时长
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