Transactions of China Electrotechnical Society  2018, Vol. 33 Issue (10): 2303-2311    DOI: 10.19595/j.cnki.1000-6753.tces.170154
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A Single-Stage Three-Phase Grid-Connected Inverter with Low Input Current Ripple
Ye Zunjing1, Ji Baojian1, Hong Feng2, Wang Xingxing1
1. College of Electrical Engineering and Control Science Nanjing Tech University Nanjing 211816 China;
2. College of Electronic and Information Engineering Nanjing University of Aeronautics & Astronautics Nanjing 210016 China;

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Abstract  

The single-stage single-phase grid-connected inverter has the defect of low-frequency ripple in input current. To overcome this defect, a novel single-stage three-phase grid-connected inverter topology and the strategy of double modulation are proposed in this paper. The three-phase output circuits share primary circuit and the active-clamp circuit is applied in this inverter, which can simplify the circuit and improve system efficiency. The input current low-frequency ripple can be reduced by using the strategy of constant power to control input current in the primary side. The strategy of inverter modulation is adopted in secondary side, and the output power of the three-phase inverter system is close to a constant value without power pulsation problem. The inverter principles, driver logic of double modulation and grid-connected algorithm are also analyzed. Finally, a 480W prototype is developed and tested, and the experimental results verify the feasibility of the micro-inverter.

Key wordsSingle-stage low input current ripple      three-phase inverter      strategy of double modulation     
Received: 20 February 2017      Published: 24 May 2018
PACS: TM464  
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Ye Zunjing
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Ye Zunjing,Ji Baojian,Hong Feng等. A Single-Stage Three-Phase Grid-Connected Inverter with Low Input Current Ripple[J]. Transactions of China Electrotechnical Society, 2018, 33(10): 2303-2311.
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