Nonlinear Adaptive Backstepping Controller Design for Islanded DC Microgrids
Nonlinear Adaptive Backstepping Controller Design for Islanded DC Microgrids
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DOI：
10.1109/tia.2018.2800680
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发表时间：
2018-02
影响因子：
4.4
通讯作者：
T. K. Roy;Md. Apel Mahmud;A. Oo;M. Haque;K. Muttaqi;N. Mendis
中科院分区：
文献类型：
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作者：
T. K. Roy;Md. Apel Mahmud;A. Oo;M. Haque;K. Muttaqi;N. Mendis
本文设计了一种非线性自适应反步控制器，用于控制直流微电网在不同运行条件下不同元件的直流母线电压。本文的直流微电网由太阳能光伏（PV）单元、电池储能系统（BESS）、备用柴油发电机和负载（临界和非临界）组成。控制器设计用于除负载外的所有组件，其中所有控制器的主要控制目标是在所有组件连接的直流总线上保持恒定电压。本文将太阳能光伏发电系统作为可再生能源，采用配备整流器的柴油发电机作为备用电源，在紧急情况下保持供电的连续性。该控制器是基于李雅普诺夫控制理论递归设计的，其中不同部件模型中的所有参数都被认为是未知的。采用自适应律对这些未知参数进行估计，并通过在设计过程的不同阶段制定合适的控制李雅普诺夫函数（clf）来保证直流微电网的稳定性。这些clf的负确定性或半确定性保证了直流微电网的稳定性。最后，在不同运行条件下的直流微电网测试中，通过仿真和实验验证了所提控制器的性能。所提出的控制器保证了在不同工作条件下直流母线电压在可接受范围内的调节。
In this paper, a nonlinear adaptive backstepping controller is designed to control the common dc-bus voltage for different components in a dc microgrid under various operating conditions. The dc microgrid in this paper comprises a solar photovoltaic (PV) unit, a battery energy storage system (BESS), a backup diesel generator, and loads (both critical and noncritical). The controllers are designed for all components except loads where the main control objective for all controllers is to maintain a constant voltage at the dc-bus where all components are connected. This paper considers solar PV systems as the renewable energy source, whereas a diesel generator equipped with a rectifier is used as a backup supply to maintain the continuity of power supply in the case of emergency situations. The proposed controller is designed recursively based on the Lyapunov control theory, where all parameters within the model of different components are considered unknown. Adaptation laws are used to estimate these unknown parameters while the stability of the dc microgrid, with these adaptation laws, is ensured through the formulation of suitable control Lyapunov functions (CLFs) at different stages of the design process. The negative definiteness or semidefiniteness of these CLFs guarantees the stability of the dc microgrid. Finally, the performance of the proposed controllers is verified using both simulations and experiments on a test dc microgrid under different operating conditions. The proposed controller ensures the regulation of the dc-bus voltage within the acceptable limits under different operating conditions.