Power dispatching control of pyramid solar micro-grid

Author(s): Zi-Ming Donga, Hsin-Yi Hsua, Bin-Juine Huanga*, Min-Han Wua, Wei-Hao Wua, Po-Chien Hsua, Kang Lia, Kung-Yen Leeb
a Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan
b Department of Engineering Science and Ocean Engineering, National Taiwan University, Taipei, Taiwan
International Journal of Smart Grid and Clean Energy, vol. 9, no. 1, January 2020: pp. 135-142
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.9.1.135-142

Abstract: The hybrid PV system (HyPV) is a solar PV system for self-consumption which operates at stand-alone PV mode or grid mode automatically without feeding access PV power into the grid. To reduce power generation loss due to mismatch between load capacity and size of battery and PV modules, a networking technique called “pyramid solar micro-grid” is proposed. The binary-connection hierarchy of HyPVs is adopted. Solar PV power of HyPVs can be shared each other through a power dispatching control. However, the system reliability due to data transmission and the power dispatching control method becomes an important issue. In the present study, we developed a transmission and communication technique using RS-485 interface combined with MODbus and CANbus protocols. A power dispatching control utilizing mobile-commander scheme was also studied. The long-term performance test of a 2+2 pyramid solar micro-grid with 4 individual HyPVs shows that the micro-grid works very well without any failure over 9 months.

Keywords: solar micro-grid, solar PV, micro-grid, distributed generation
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