Efficiency comparison between the LLCL and LCL-filters based single-phase grid-tied inverters

Archives of Electrical Engineering

Weimin Wu¹  Min Huang¹  Frede Blaabjerg¹ 

关键词: LCL-filter;    LLCL-filter;    efficiency power loss;    modulation;    single-phase grid-tied inverter;   

DOI  :  10.2478/aee-2014-0005

来源: Versita

【 摘 要 】

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

【 授权许可】

Unknown