Autonomous Voltage Regulation and Current Sharing in Islanded Multi-Inverter DC Microgrid
Autonomous Voltage Regulation and Current Sharing in Islanded Multi-Inverter DC Microgrid
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DOI：
10.1109/tsg.2017.2712658
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发表时间：
2018-11
影响因子：
9.6
通讯作者：
Qiang Yang;Le Jiang;Hailin Zhao;Hongmei Zeng
中科院分区：
文献类型：
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作者：
Qiang Yang;Le Jiang;Hailin Zhao;Hongmei Zeng
本文提出了一种分散式孤岛直流微电网的自主电压控制解决方案。直流母线电压由多个可再生能源（RES）和储能单元（ESU）在不同的运行模式下协同调节，自动进行，无需依赖底层通信。与处理总线电压调节和均流之间权衡的现有基于下垂控制的解决方案不同，我们通过将 SoC 和容量信息纳入 ESU 的双闭环控制，提出了一种基于充电状态 (SoC) 的均流方法。这有效地消除了直流母线电压偏差，同时保证了各个ESU之间的SoC平衡。此外，还提出了一种非最大功率点跟踪算法，用于RES管理其输出发电，以便在ESU无法单独调节发电-需求平衡的情况下协同维持母线电压稳定性。建议的解决方案通过一系列操作场景的模拟实验进行评估，并通过数值结果证实其有效性。
This paper presents an autonomous voltage control solution in islanded dc microgrid in a decentralized fashion. The dc bus voltage is regulated cooperatively by multiple renewable energy sources (RES) and energy storage units (ESUs) in different operation modes, automatically without relying on underlying communication. Unlike the existing droop control-based solutions that deal with the trade-off between bus voltage regulation and current sharing, we present a state-of-charge (SoC)-based current sharing method through the incorporation of SoC and capacity information into the double closed-loop control for ESUs. This effectively eliminates the dc bus voltage deviation, and simultaneously guarantees the SoC balance among individual ESUs. In addition, an off-maximum power point tracking algorithm is proposed for RES to manage their output generation for cooperatively maintaining the bus voltage stability in the case that the generation-demand balance cannot be regulated by ESUs alone. The suggested solution is assessed through a set of simulation experiments for a range of operational scenarios and its effectiveness is confirmed by the numerical results.