Distributed Adaptive Droop Control for DC Distribution Systems
Distributed Adaptive Droop Control for DC Distribution Systems
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DOI：
10.1109/tec.2014.2350458
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发表时间：
2014-09
影响因子：
4.9
通讯作者：
V. Nasirian;A. Davoudi;Frank L. Lewis;Josep M. Guerrero
中科院分区：
文献类型：
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作者：
V. Nasirian;A. Davoudi;Frank L. Lewis;Josep M. Guerrero
提出了一种用于直流微电网二次/一次控制的分布式自适应下垂机制。调节局部下垂机制的电压设定点的常规次级控制由电压调节器代替。还增加了一个电流调节器，以微调不同负载条件下的下垂系数。电压调节器使用一个观测器来处理邻居的数据，以估计微电网上的平均电压。该估计还用于生成电压校正项以调整局部电压设定点。电流调节器将每个转换器的本地每单位电流与通信图上相邻转换器的每单位电流进行比较，并相应地提供阻抗校正项。然后，该项用于更新下垂系数并同步每单位电流，或者等效地，提供比例负载共享。所提出的控制器精确地占的传输/配电线路阻抗。每个转换器上的控制器仅与跨越微电网的稀疏通信图上的相邻转换器交换数据。微电网的全局动态模型推导出所提出的控制器从事。一个低压直流微电网原型被用来验证控制器的性能，链路故障的弹性，和即插即用的能力。
A distributed-adaptive droop mechanism is proposed for secondary/primary control of dc microgrids. The conventional secondary control that adjusts the voltage set point for the local droop mechanism is replaced by a voltage regulator. A current regulator is also added to fine-tune the droop coefficient for different loading conditions. The voltage regulator uses an observer that processes neighbors' data to estimate the average voltage across the microgrid. This estimation is further used to generate a voltage correction term to adjust the local voltage set point. The current regulator compares the local per-unit current of each converter with the neighbors' on a communication graph and, accordingly, provides an impedance correction term. This term is then used to update the droop coefficient and synchronize per-unit currents or, equivalently, provide proportional load sharing. The proposed controller precisely accounts for the transmission/distribution line impedances. The controller on each converter exchanges data with only its neighbor converters on a sparse communication graph spanned across the microgrid. Global dynamic model of the microgrid is derived with the proposed controller engaged. A low-voltage dc microgrid prototype is used to verify the controller performance, link-failure resiliency, and the plug-and-play capability.