Abstract
An LLCL-filter is becoming more attractive than an LCL-filter as the interface between the grid-tied inverter and the grid due to possibility of reducing the copper and the magnetic materials. The efficiency of the LLCL-filter based single-phase grid-tied inverter also excites interests for many applications. The operation of the switches of the VSI is various with different modulation methods, which lead to different efficiencies for such a single-phase grid-tied inverter system, and therefore important research has been carried out on the effect of the choice of PWM schemes. Then power losses and efficiencies of the LLCL-filter and the LCL-filter based single-phase grid-tied inverters are analyzed and compared under the discontinuous unipolar, the dual-buck and the bipolar modulations. Results show that the efficiency of LLCL-filter based inverter system is higher than the LCL- filter based independent on the modulation method adopted. Experiments on a 2 kW prototype are in good agreement with results of the theoretical analysis
Original language | English |
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Journal | Archives of Electrical Engineering |
Volume | 63 |
Issue number | 1 |
Pages (from-to) | 63-79 |
Number of pages | 17 |
ISSN | 1427-4221 |
DOIs | |
Publication status | Published - Mar 2014 |
Keywords
- LCL-filter
- LLCL-filter
- Efficiency power loss
- Modulation
- Single-phase grid-tied inverter