Master-Slave Cooperation for Multi-DC-MGs via Variable Cyber Networks
Master-Slave Cooperation for Multi-DC-MGs via Variable Cyber Networks
复制标题
通过可变网络网络实现多 DC-MG 的主从合作
DOI：
10.1109/tcyb.2020.3035587
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发表时间：
2020
影响因子：
11.8
通讯作者：
Guoping Liu
中科院分区：
文献类型：
--
作者：
Xiaoqing Lu;Jingang Lai;Guoping Liu
微电网(MG)的可靠性可以通过互联邻近的MG来提高，因为一个MG中的电力短缺可以由其他互联的MG提供的过剩电力来补偿。针对由大量异质分布式电源(DG)组成的多个DC MG集群，建立了一个包含两层电压估计器的主从式协作框架。所有主分布式电源在多个MG集群之间进行电流经济分配，并驱动各自的从分布式电源实现均流精度。与前人的工作相比，该控制策略具有均流准确、电流分配经济、耗时短、收敛速度快、对不确定通信环境具有较强的鲁棒性等优点。此外，所有分布式控制器都可以在一个可变的网络中实现，从而很好地匹配了MG系统频繁切换的特点。给出了保证整个系统稳定的两层网络控制时间常数的充分条件。在MATLAB/SimPowerSystems中对不同的算例进行了测试，验证了结果的有效性。
The reliability of the microgrid (MG) can be improved by interconnecting MGs that are in close proximity, because the power shortfall in one MG can be compensated by the excess power available from other interconnected MGs. For multiple dc MG clusters consisting of a large number of heterogeneous distributed generators (DGs), this article establishes a master–slave cooperation framework containing a two-layer voltage estimator. All master-DGs implement current economical allocation among multiple MG clusters and drive their respective slave-DGs to realize current sharing accuracy. Compared with the previous work, the proposed control strategy has the advantages of simultaneous achievement of accurate current sharing and current economical allocation, short time consumption and faster convergence, and robustness against uncertain communication environments. Moreover, all distributed controllers are allowed to be implemented in a variable cyber network, thus well matching the characteristics of frequent switching operation in MG systems. Sufficient conditions in terms of control time constants for the two-layer cyber network are also deduced to ensure entire system stability. Different cases are tested to verify the effectiveness of the results in MATLAB/SimPowerSystems.