A Cost-Effective Decentralized Control for AC-Stacked Photovoltaic Inverters

Hua Han, Chao Luo, Xiaochao Hou, Mei Su, Wenbin Yuan, Zhangjie Liu and Josep M. Guerrero
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Hua Han: School of Information Science and Engineering, Central South University, Changsha 410083, China
Chao Luo: School of Information Science and Engineering, Central South University, Changsha 410083, China
Xiaochao Hou: School of Information Science and Engineering, Central South University, Changsha 410083, China
Mei Su: School of Information Science and Engineering, Central South University, Changsha 410083, China
Wenbin Yuan: School of Information Science and Engineering, Central South University, Changsha 410083, China
Zhangjie Liu: School of Information Science and Engineering, Central South University, Changsha 410083, China
Josep M. Guerrero: Department of Energy Technology, Aalborg University, DK-9220 Aalborg East, Denmark

Energies, 2018, vol. 11, issue 9, 1-12

Abstract: For an AC-stacked photovoltaic (PV) inverter system with N cascaded inverters, existing control methods require at least N communication links to acquire the grid synchronization signal. In this paper, a novel decentralized control is proposed. For N inverters, only one inverter nearest the point of common coupling (PCC) needs a communication link to acquire the grid voltage phase and all other N − 1 inverters use only local measured information to achieved fully decentralized local control. Specifically, one inverter with a communication link utilizes the grid voltage phase and adopts current control mode to achieve a required power factor (PF). All other inverters need only local information without communication links and adopt voltage control mode to achieve maximum power point tracking (MPPT) and self-synchronization with grid voltage. Compared with existing methods, the communication link and complexity is greatly reduced, thus improved reliability and reduced communication costs are achieved. The effectiveness of the proposed control is verified by simulation tests.

Keywords: AC-stacked PV inverters; PV generation; decentralized control; self-synchronization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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