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| Controller Design of Grid-Connected Microinverter Based on Interleaved Flyback Structure |
| Zhang Fengge1,Zhu Shilu1,Yin Xiaoju1,2,Teng Zhifei1 |
1. Shenyang University of Technology Shenyang 110870 China
2.Liaoning Solar Energy R&D CO.,LTD Shenyang 110130 China |
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Abstract According to the features of grid-connected PV microinverter controller,an interleaved flyback with a simple and isolated structure was used. In this paper,by simplifying the circuit model of flyback converter,the converter#x02019;s control characteristics is analyzed,and the current which obtained from maximum power point tracking(MPPT) control is made as the benchmark,and then control the flyback transformer original side with the average current control method to realize the half sinusoidal current output. For the interleaved flyback converter may appear load imbalance,a load balance control loop is proposed. Establish a mathematical model of the photovoltaic cell,and deduce the utilization relationship between input decoupling capacitor and the photovoltaic cell panel. By choosing the appropriate input capacitance,the efficiency of system is improved effectively. At last,the effectiveness of the controller is validated in the Matlab/Simulink simulation environment,and a better output waveform is achieved from a converter test.
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Received: 20 September 2012
Published: 11 December 2013
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2013, Vol. 28 
