A Decentralized Control Method for a Low-Voltage DC Microgrid
A Decentralized Control Method for a Low-Voltage DC Microgrid
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DOI：
10.1109/tec.2014.2329236
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发表时间：
2014-06
影响因子：
4.9
通讯作者：
A. Khorsandi;M. Ashourloo;H. Mokhtari
中科院分区：
文献类型：
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作者：
A. Khorsandi;M. Ashourloo;H. Mokhtari
直流微电网（DC-MG）作为整合各种可再生能源的有效手段正在变得越来越流行。传统上，下垂控制被采用作为分散控制策略，以在不使用任何通信链路的情况下实现适当的功率共享。然而，传统的下垂控制常常由于线路电阻不等的影响而恶化。本文提出了一种考虑线路电阻影响的 DC-MG 控制策略，以实现完美的功率共享。正在研究的DC-MG由一个光伏系统、两个储能系统、一个并网变流器系统和直流负载组成。转换器的控制策略在不同的操作模式下得到解决。为了使 DC-MG 获得长期可靠的运行，功率共享策略中还考虑了电池的充电状态。仿真和实验结果验证了该方法的有效性和有效性。
DC microgrids (DC-MGs) are becoming popular as an effective means to integrate various renewable energy resources. Conventionally, the droop control is adopted as a decentralized control strategy for proper power sharing without using any communication link. However, the conventional droop control often deteriorates due to the effects of unequal line resistances. In this paper, a control strategy is proposed for a DC-MG to achieve perfect power sharing considering the effects of line resistances. The DC-MG under study consists of a photovoltaic system, two energy storage systems, a grid-connected converter system, and dc loads. The control strategy of the converters is addressed under various operation modes. To obtain prolonged and reliable operation of the DC-MG, the state of charge of the batteries is also considered in the power sharing strategy. Simulation and experimental results are provided to verify the effectiveness and validity of the proposed method.