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1

School of Electric Power, South China University of Technology, Guangzhou 510640, China

2

Guangdong Key Laboratory of Clean Energy Technology, Guangzhou 511458, China

3

National-Local Joint Engineering Laboratory for Wind Power Control and Integration Technology, South China University of Technology, Guangzhou 511458, China





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Author to whom correspondence should be addressed.



Academic Editor: Josep M. Guerrero

Abstract With the rapid development of microgrids MGs in recent years, it is anticipated that combinations of multiple microgrids—multi-microgrids MMGs—will gradually become a new form of power grid. A safe and efficient black start strategy for MMGs is in urgent demand because of their complicated structure and control systems. In this paper, first, we analyze the topology and control system of residential-type MMGs with three-phase-single-phase TP-SP architecture. Second, a black start strategy based on a hierarchical control scheme is presented, including the selection strategy for the main power supply and master microgrid, the stand-alone operation strategy, and the grid-connected operation strategy. After the selection of the main power supplies, the master MG is determined. Hereby, all sub-microgrids SMGs execute the stand-alone algorithm. When the synchronous connection condition is satisfied, the slave SMGs connect to the master MG who provides the voltage and frequency support. Meanwhile, the control algorithm transfers to the grid-connected algorithm, with the grid dispatching value set to zero. Finally, experimental results from the MMG experimental setup in the Clean Energy Technology Laboratory CETLAB are presented to verify the effectiveness and feasibility of the proposed black start strategy. View Full-Text

Keywords: multi-microgrids; black start; hierarchical control; distributed restoration multi-microgrids; black start; hierarchical control; distributed restoration





Autor: Zhirong Xu 1,2, Ping Yang 1,2,3, Zhiji Zeng 1,* , Jiajun Peng 1 and Zhuoli Zhao 1

Fuente: http://mdpi.com/



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