Distributed Control of DC Microgrids for Optimal Coordination of Conventional and Renewable Generators
Distributed Control of DC Microgrids for Optimal Coordination of Conventional and Renewable Generators
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直流微电网的分布式控制，实现传统发电机和可再生发电机的最佳协调
DOI：
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发表时间：
2021
影响因子：
9.6
通讯作者：
Wenxin Liu
中科院分区：
文献类型：
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作者：
Zhen;Bo Fan;Wenxin Liu
直流微电网由于其简单性和高能源效率而越来越受欢迎，并成为协调多个传统发电机（CG）和可再生发电机（RG）的有吸引力的解决方案。本文提出了一种分布式离散时间控制方案，以实现 CG 和 RG 的最佳协调，其中 CG 的发电成本最小化，RG 的能源利用率最大化。 RG之间还实现了一定程度的比例负载分配，以提高直流微电网的稳定性裕度和动态性能。设计的控制算法可以将母线电压维持在安全工作范围内。此外，由于所提出的控制算法是直接在离散时间域中开发的，因此可以避免控制算法数字实现可能带来的不稳定影响。基于Lyapunov分析，严格分析了闭环系统的稳定性和收敛性。最后，基于详细的开关级直流微电网模型的仿真结果说明了所提出的最优控制算法的优点。
DC microgrids are increasing in popularity due to their simplicity and high energy efficiency, and becoming an appealing solution for the coordination of multiple conventional generators (CGs) and renewable generators (RGs). This article presents a distributed discrete-time control scheme to achieve the optimal coordination of CGs and RGs, where the generation cost of the CGs is minimized and the energy utilization of RGs is maximized. A certain degree of proportional load sharing among the RGs is also achieved to improve the stability margin and dynamic performance of dc microgrids. The designed control algorithm can maintain the bus voltages in their safe operating ranges. Besides, since the proposed control algorithm is developed in the discrete-time domain directly, it can avoid the possible instability impact of the digital implementation of control algorithms. Based on the Lyapunov analysis, the stability and convergence of the closed-loop system are analyzed rigorously. Finally, simulation results based on a detailed switch-level dc microgrid model illustrate the advantages of the proposed optimal control algorithm.