Multiple microgrids are the structure extension and function expansion of single microgrid, which is one of the important ways to absorb high-permeability renewable energies. In order to solve the problems of huge disturbance influence and poor control flexibility of the AC interconnected multiple microgrids, this paper proposed a hybrid unit of common coupling for multiple microgrids. The interface consists of AC/DC switches, a voltage source converter and energy storage devices. The study designs the structure, the connection mode and the control mode of the hybrid unit, and constructs the flexible interconnection scheme for multiple microgrids. The gird-connected mode, islanding mode, and emergency mode as well as the mode switch method were then proposed based on the hybrid units of common coupling. The tri-layer coordinated control architecture of central layer, interface layer, and microgrid layer and its control method were also presented. The simulation model of the multiple microgrids based on the hybrid unit of common coupling was built in PSCAD/EMTDC. The simulation shows that the proposed architecture and control method has good steady-state and transient operation performance. Meanwhile, the actual operation results under different modes prove better than the operation requirements. The multiple microgrids based on the hybrid unit of common coupling is a feasible method to organize and coordinate the operation of high-permeability distributed generation. It is suitable for the multiple microgrids that requires high stability and flexibility.
|Translated title of the contribution||Architecture Design and Control Method for Flexible Connected Multiple Microgrids Based on Hybrid Unit of Common Coupling|
|Original language||Chinese (Traditional)|
|Number of pages||15|
|Journal||Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering|
|State||Published - Jun 20 2019|
Bibliographical noteFunding Information:
基金项目：上海市科技英才扬帆计划(17YF1410200)；国网江苏省 电力公司科技项目资助(J2017074)。 Project Supported by the Funding: Shanghai Sailing Program (17YF1410200); Technology Foundation of State Grid Jiangsu Electric Power Co., Ltd. (J2017074).
© 2019 Chin. Soc. for Elec. Eng.
- Control strategy
- DC interface
- Flexible interconnection
- Hybrid unit of common coupling
- Multiple microgrids