Model-Based Current Sharing Approach for DCM Interleaved Flyback Micro-Inverter

Mi Dong, Xiaoyu Tian, Li Li, Dongran Song, Lina Wang and Miao Zhao
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Mi Dong: School of Information Science and Engineering, Yuelu Road, Central South University, Changsha 410083, China
Xiaoyu Tian: School of Information Science and Engineering, Yuelu Road, Central South University, Changsha 410083, China
Li Li: School of Information Science and Engineering, Yuelu Road, Central South University, Changsha 410083, China
Dongran Song: School of Information Science and Engineering, Yuelu Road, Central South University, Changsha 410083, China
Lina Wang: School of Automation Science and Electrical Engineering, Xueyuan Road, Beihang University, Beijing 100191, China
Miao Zhao: State Grid Hunan Electric Power Company Limited Research Institute, Changsha 410007, China

Energies, 2018, vol. 11, issue 7, 1-21

Abstract: Current sharing control is a challenge for a discontinuous conduction mode (DCM) micro-inverter based on interleaved flyback topology. To solve this problem, this study proposes a novel and systemic model-based approach. Firstly, an accurate fourth-order model is presented for the interleaved flyback circuit, which takes the two flybacks’ parameter mismatch and coupling into account. Secondly, based on the presented model, a continuous time sliding mode current controller is proposed to tackle the output imbalance caused by parameter mismatch, coupling and disturbance. The proposed controller is derived from the Lyapunov function without switching conditions. Finally, the effectiveness of the proposed model and control method is validated by simulation tests using MATLAB/SIMULINK. Simulation results show that the proposed approach improves the current sharing for the interleaved flyback micro-inverter when compared to the conventional current sharing approach.

Keywords: accurate modeling; sliding mode control (SMC); current control; interleaved flyback (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 references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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