A Novel Droop-Based Average Voltage Sharing Control Strategy for DC Microgrids
A Novel Droop-Based Average Voltage Sharing Control Strategy for DC Microgrids
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DOI：
10.1109/tsg.2014.2357179
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发表时间：
2015-05
影响因子：
9.6
通讯作者：
Po-Hsu Huang;Po-Chun Liu;W. Xiao;M. E. Moursi
中科院分区：
文献类型：
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作者：
Po-Hsu Huang;Po-Chun Liu;W. Xiao;M. E. Moursi
介绍了一种基于下垂方法的直流微网分散电压控制策略。提出的分布式二次电压控制采用平均电压均压方案来补偿下垂控制引起的电压偏差。该控制策略通过非显式通信，实现了终端电压的精确调节，提高了系统在系统故障时的可靠性。采用双恰当的抗卷绕设计方法实现了类似于集中式二次电压控制器的分布式电压补偿器，解决了必然导致控制器输出饱和的集成问题。提出的先导母线调压概念，为无集中结构的终端电压管理提供了可能。此外，基于特征值分析和小信号建模，以电缆谐振模式为重点说明了网络动力学；通过建立等效电路的解析解释，清楚地描述了控制器参数和下垂增益如何影响系统的减振性能。所提出的导数下垂控制在暂态过程中能够抑制振荡，提高系统的稳定性。最后，通过仿真和实验验证了该控制策略的有效性和可行性。
This paper introduced a decentralized voltage control strategy for dc microgrids that is based on the droop method. The proposed distributed secondary voltage control utilizes an average voltage sharing scheme to compensate the voltage deviation caused by the droop control. Through nonexplicit communication, the proposed control strategy can perform precise terminal voltage regulation and enhance the system reliability against system failures. The distributed voltage compensators that resemble a centralized secondary voltage controller are implemented with the bi-proper anti-wind-up design method to solve the integration issues that necessarily lead to the saturation of the controller output efforts. The proposed concept of pilot bus voltage regulation shows the possibility of managing the terminal voltage without centralized structure. Moreover, the network dynamics are illustrated with a focus on cable resonance mode based on the eigenvalue analysis and small-signal modeling; analytical explanations with the development of equivalent circuits give a clear picture regarding how the controller parameters and droop gains affect the system damping performance. The proposed derivative droop control has been demonstrated to damp the oscillation and to improve the system stability during transients. Finally, the effectiveness and feasibility of the proposed control strategy are validated by both simulation and experimental evaluation.