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Design and research on parameter of LCL filter in three-phase grid-connected inverter

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4 Author(s)
Fei Liu ; Sch. of Electr. Eng., Wuhan Univ., Wuhan, China ; Xiaoming Zha ; Yan Zhou ; Shanxu Duan

Since LCL filter has smaller inductance value comparing to L type filter with the same performance in harmonic suppression. It is gradually used in high-power and low-frequency current-source-controlled grid-connected converters. However design of LCL filter's parameter not only relates switch frequency ripple attenuation, but also impacts on performance of grid-connected current controller. This paper firstly introduced a harmonic model of LCL filter in grid-connected operation, then researched the variable relationship among LCL filter's parameter and resonance frequency and high-frequency ripple attenuation. Based on above analysis a reasonable design method was brought out in order to achieve optimal effect under the precondition of saving inductance magnetic core of LCL filter, at the same time guaranteeing the resonance frequency of LCL filter was not too small lest restrict current controller resign. Finally this design method was verified by the experimental results.

Published in:

Power Electronics and Motion Control Conference, 2009. IPEMC '09. IEEE 6th International

Date of Conference:

17-20 May 2009

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