Coordination control strategy of DC microgrid with two DC buses based on power pool

2017 12th IEEE Conference on Industrial Electronics and Applications (ICIEA) Pub Date : 2017-06-01 DOI:10.1109/ICIEA.2017.8283065

Longfeng Liu, Zhichang Mi, C. Ren, W. Qin, Xiaoqing Han, Peng Wang

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引用次数: 3

Abstract

In order to integrate DC micro sources and loads of different voltage levels to DC microgrids, a novel DC sub-microgrid and its coordination control strategy are proposed in this paper. The DC microgrid consists of two sub-microgrids with different voltage levels through a power pool. A lithium battery pack is set as the energy backup of the power pool. Droop control is designed for the power pool to compensate the unbalanced power in the microgrid. The lithium battery pack is controlled by sampling the voltage of the power pool to avoid energy shortage of the power pool and smooth the current of the battery. The system is divided into nine operations region to coordinate the units in the sub-microgrid. Finally, simulation results show that the proposed control strategy can not only stabilize the DC bus voltages, but also realize low frequency power exchanges among the two sub-microgrids and the lithium battery pack. Furthermore, system loss could be reduced and the battery life can be prolonged.

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基于功率池的双直流母线直流微电网协调控制策略

为了将不同电压等级的直流微源和负载整合到直流微电网中，提出了一种新型的直流亚微电网及其协调控制策略。直流微电网通过电源池由两个不同电压等级的子微电网组成。配置锂电池包作为电源池的备用电源。为补偿微电网中的不平衡功率，对电力池进行了下垂控制。锂电池组通过采样电源池的电压来控制，避免电源池的能量短缺，使电池的电流平滑。该系统被划分为九个运行区域，以协调亚微电网中的单元。仿真结果表明，该控制策略不仅可以稳定直流母线电压，还可以实现两个亚微电网和锂电池组之间的低频功率交换。此外，还可以减少系统损耗，延长电池寿命。

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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2017 12th IEEE Conference on Industrial Electronics and Applications (ICIEA)

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