Solid-State Transformer Enabled DCMG Architecture with Distributed Energy Management

A. B. Shitole, V. Khadkikar, M. Shaaban, A. R. Beig, Hatem H. Zeineldin
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Abstract

This paper proposes a new topology for solid-state transformer (SST) enabled versatile DC Microgrids (DCMGs) with flexible DC links. In the proposed topology, the SST and the DCMGs are interfaced through a bi-directional DC-DC converter to create a main DC bus and dedicated DC link for each microgrid with flexible voltage level. The proposed architecture allows seamless integration of DCMGs to the SST without affecting operation and control of the SST. Moreover, an independent energy management algorithm is proposed for DCMG to achieve maximum energy utilization and minimum power exchange between the DCMG and utility AC grid through the SST. The proposed energy management algorithm features a novel battery state of charge dependent voltage droop characteristics that is integrated in the energy management algorithm to regulate the DCMG bus voltage and maintain energy balance. Seamless transition and smooth operation of the proposed DCMG architecture under grid connected mode is validated through MATLAB simulation based study.
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固态变压器支持DCMG架构与分布式能源管理
本文提出了一种新的拓扑结构,用于支持固态变压器(SST)的具有灵活直流链路的通用直流微电网(dcmg)。在提出的拓扑结构中,SST和dcmg通过双向DC-DC转换器进行接口,为每个具有灵活电压水平的微电网创建主直流总线和专用直流链路。所提出的架构允许dcmg与SST无缝集成,而不会影响SST的操作和控制。提出了一种独立的DCMG能量管理算法,通过SST实现DCMG与市电交流电网的能量利用最大化和功率交换最小化。提出的能量管理算法将电池充电状态相关的电压下降特性集成到能量管理算法中,以调节DCMG母线电压并保持能量平衡。通过MATLAB仿真研究,验证了所提出的DCMG结构在并网模式下的无缝过渡和平稳运行。
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