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首页> 外文期刊>IEEE systems journal >A Multilevel Distributed Hybrid Control Scheme for Islanded DC Microgrids
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A Multilevel Distributed Hybrid Control Scheme for Islanded DC Microgrids

机译：孤岛直流微电网的多级分布式混合控制方案

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This paper proposes a multilevel hybrid control scheme, including grid control and node control, for an islanded 48-V solar photovoltaic-based low voltage dc microgrid that aims to overcome the drawbacks of centralized and decentralized control schemes. The analyzed microgrid includes a 35-kW rooftop solar system as the main power source at bus-1 with battery storage, 5-kW hybrid energy storage system (Vanadium Redox flow battery with super capacitor) at bus-2, and variable loads such as electrical vehicles at bus-3. In the case of a central failure, the proposed hybrid control scheme is capable of seamlessly switching between high bandwidth communication and low bandwidth communication channels of communications to implement a distributed control scheme. The central supervisory controller is responsible for updation of grid characteristics and sending/receiving information to/from local node controllers, which are responsible for bus voltage regulation and energy management. The control hierarchy features optimized and safe operation (charge and discharge) of storage devices in dc microgrids. The paper also demonstrates the application of battery-supercapacitor systems to absorb system transients during load changes. The simulation showcases the continuous flow of information and decision processes via each level of control while simultaneously taking into consideration the constraints of each subsystem. The scheme has been simulated in MATLAB/Simulink environment for various case studies to evaluate system robustness. Further, the proposed scheme has been tested experimentally with its prototype and its results are explored.
机译：本文提出了一种基于岛式48V太阳能光伏低压直流微电网的多级混合控制方案，包括电网控制和节点控制，旨在克服集中式和分散式控制方案的缺点。分析的微电网包括35kW屋顶太阳能系统作为总线1的主要电源，带有电池存储，5kW混合能量存储系统（带超级电容器的钒氧化还原液流电池）在总线2，以及可变负载，例如公共汽车3处的电动汽车。在中央故障的情况下，提出的混合控制方案能够在通信的高带宽通信通道和低带宽通信通道之间无缝切换以实现分布式控制方案。中央监控控制器负责更新电网特性，并向/从本地节点控制器发送/接收信息，这些本地节点控制器负责总线电压调节和能量管理。控制层次结构的特点是优化了直流微电网中存储设备的安全性（充电和放电）。本文还演示了电池超级电容器系统在负载变化期间吸收系统瞬变的应用。该模拟展示了通过每个控制级别的信息和决策过程的连续流，同时考虑了每个子系统的约束。该方案已在MATLAB / Simulink环境中进行了仿真，用于各种案例研究，以评估系统的鲁棒性。此外，该方案已通过其原型进行了实验测试，并对其结果进行了探索。

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