基于 MMC 的多终端混合微电网中的直接调制:不平衡配电下的臂式电容器电压平衡解决方案

IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
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引用次数: 0

摘要

由于分布式发电系统(DGs)的广泛采用,全球研究界对交流(AC)/直流(DC)混合微电网的兴趣日益浓厚。因此,本研究将模块化多电平转换器(MMC)应用于互联微电网,作为涉及交流和直流系统的互联转换器。在这种拓扑结构中,MMC 由多个子模块 (SM) 组成,低压直流 (LVDC) 微电网通过双有源桥 (DAB) 转换器与每个子模块的输出相连。采用这种拓扑结构后,可以连接更多的 LVDC 微电网,从而提高电力转换的可行性。然而,在 LVDC 微电网间功率分配不均的情况下,臂电容器电压平衡成为一项具有挑战性的任务,如果不加以解决,将导致 MMC 终端输出电压不平衡,从而影响整个系统。因此,本文提出使用直接调制方法,该方法能够在 MMC 内自然产生环流的基波和直流分量。这些环流分量负责在 MMC 臂之间均匀分配能量,并平衡臂电容器电压。通过在 OPAL-RT (OP5700) 环境中进行实时仿真,进一步评估了所提方法的有效性。研究结果验证了直接调制可以在不平衡功率条件下保持基于 MMC 的多端混合微电网的最佳性能,而无需应用额外的控制器,从而简化了系统设计,提高了整体效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Direct modulation in MMC-Based multiterminal hybrid Microgrid: A solution for arm capacitor voltage balancing under unbalanced power distribution
The rising interest in hybrid alternating current (AC)/ direct current (DC) microgrids among the global research community can be attributed to the widespread adoption of distributed generation systems (DGs). Therefore, this study applies the modular multilevel converter (MMC) in interconnected microgrids to serve as an interlinking converter involving the AC and DC systems. In this topology, the MMC consists of several submodules (SMs) where a low-voltage direct current (LVDC) microgrid is connected to the output of each SM through a dual active bridge (DAB) converter. As a result of using this topology, more LVDC microgrids can be linked, thus enhancing power transition feasibility. However, during unequal power distribution across LVDC microgrids, the arm capacitor voltage balancing becomes a challenging task and if left unsolved, it will result in unbalanced output voltage at the MMC terminal, thereby affecting the overall system. Therefore, this paper proposes the use of the direct modulation method that is capable of naturally producing fundamental and DC components of the circulating current within the MMC. These circulating current components are responsible for uniformly distributing the energy between the arms of the MMC and balancing the arm capacitor voltage. The effectiveness of the proposed method is further assessed through real-time simulation in the OPAL-RT (OP5700) environment. The findings of this study validate that direct modulation can maintain the optimal performance of a multiterminal hybrid microgrid based on MMC under unbalanced power conditions without applying additional controllers, thus simplifying the system design, and improving the overall efficiency.
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来源期刊
International Journal of Electrical Power & Energy Systems
International Journal of Electrical Power & Energy Systems 工程技术-工程:电子与电气
CiteScore
12.10
自引率
17.30%
发文量
1022
审稿时长
51 days
期刊介绍: The journal covers theoretical developments in electrical power and energy systems and their applications. The coverage embraces: generation and network planning; reliability; long and short term operation; expert systems; neural networks; object oriented systems; system control centres; database and information systems; stock and parameter estimation; system security and adequacy; network theory, modelling and computation; small and large system dynamics; dynamic model identification; on-line control including load and switching control; protection; distribution systems; energy economics; impact of non-conventional systems; and man-machine interfaces. As well as original research papers, the journal publishes short contributions, book reviews and conference reports. All papers are peer-reviewed by at least two referees.
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