A Decentralized Control Architecture Applied to DC Nanogrid Clusters for Rural Electrification in Developing Regions
A Decentralized Control Architecture Applied to DC Nanogrid Clusters for Rural Electrification in Developing Regions
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DOI：
10.1109/tpel.2018.2828538
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发表时间：
2019-02
影响因子：
6.7
通讯作者：
M. Nasir;Zheming Jin;H. Khan;N. Zaffar;J. Vasquez;J. Guerrero
中科院分区：
文献类型：
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作者：
M. Nasir;Zheming Jin;H. Khan;N. Zaffar;J. Vasquez;J. Guerrero
由于其可扩展性和资源共享能力，通过自下而上的方法构建的直流微电网在群体电气化中越来越受欢迎。然而，它们通常需要复杂的控制技术，包括分布式资源之间的通信，以实现稳定和协调的运行。在这项工作中，我们提出了一种无通信策略，用于分散控制基于光伏(PV)/电池的高度分布式直流微电网。该体系结构由纳米网格集群（家庭）组成，其中每个纳米网格可以独立工作，并提供与社区共享资源的规定。采用了一种自适应I-V下垂方法，该方法依赖于局部电荷状态和直流母线电压的测量来实现贡献纳米电网之间的协调电力共享。单个纳米电网的光伏发电能力通过局部控制器与电网稳定状态同步，局部控制器可以在最大功率点跟踪模式和电流控制模式之间切换。采用分散式控制方案的分布式体系结构，实现了1)结构的可扩展性和模块化，2)更高的分布效率，3)无通信、协调的资源共享。通过在MATLAB/Simulink和奥尔堡大学微电网实验室的硬件在环设施上进行仿真，验证了所提出的控制方案在各种可能的电力共享场景中的有效性。
DC microgrids built through a bottom-up approach are becoming popular for swarm electrification due to their scalability and resource-sharing capabilities. However, they typically require sophisticated control techniques involving communication among the distributed resources for stable and coordinated operation. In this work, we present a communication-less strategy for the decentralized control of a photovoltaic (PV)/battery-based highly distributed dc microgrid. The architecture consists of clusters of nanogrids (households), where each nanogrid can work independently along with provisions of sharing resources with the community. An adaptive I–V droop method is used, which relies on local measurements of state of charge and dc bus voltage for the coordinated power sharing among the contributing nanogrids. PV generation capability of individual nanogrids is synchronized with the grid stability conditions through a local controller, which may shift its modes of operation between maximum power point tracking mode and current control mode. The distributed architecture with the proposed decentralized control scheme enables 1) scalability and modularity in the structure, 2) higher distribution efficiency, and 3) communication-less, yet coordinated resource sharing. The efficacy of the proposed control scheme is validated for various possible power-sharing scenarios using simulations on MATLAB/Simulink and hardware-in-the-loop facilities at the Microgrid Laboratory, Aalborg University.