Research on Current Harmonic Suppression Strategy of the LCL Grid-connected Inverter

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Research on Current Harmonic Suppression Strategy of the LCL Grid-connected Inverter

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[1]LIU Haiyang,DONG Lianghui,GAO Jinfeng,et al.Research on Current Harmonic Suppression Strategy of the LCL Grid-connected Inverter[J].Journal of Zhengzhou University (Engineering Science),2022,43(01):97-102.[doi:10.13705/j.issn.1671-6833.2021.05.023]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43 Number of periods: 2022 01 Page number: 97-102 Column: Public date: 2022-01-09

Title:: Research on Current Harmonic Suppression Strategy of the LCL Grid-connected Inverter

Author(s):: LIU Haiyang; DONG Lianghui; GAO Jinfeng; WANG Yaoqiang; HUANG Wenjian; School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China

Keywords:: LCL filter; resonant frequency; grid-connected inverter; feedforward control of grid voltage; parameter design

CLC:: TM464

DOI:: 10.13705/j.issn.1671-6833.2021.05.023

Abstract:: The increasing number of nonlinear devices increased the harmonic content of grid voltage background and led to the grid-connected current distortion of inverter. In order to suppress grid-connected current harmonics, an improved grid voltage proportional-feedforward control strategy was proposed. The influence of inverter side inductance and filter capacitance on grid voltage proportional-feedforward control strategy of LCL grid-connected inverter was analyzed, and the optimal selection method of inverter side inductance and filter capacitor was obtained. That was to say, according to the performance requirements and equipment safety requirements of the inverter, the range of inductance and filter capacitor on the inverter side of LCL grid-connected inverter was determined, and the appropriate inductance value was determined accordingly. Then the harmonic content of grid-connected current was reduced by selecting a smaller capacitance value. Finally, the effectiveness of the control strategy and optimization method was verified in the prototype of LCL grid-connected inverter. The experimental results showed that the total harmonic distortion rate of grid-connected current of LCL grid-connected inverter was reduced from 4.04% to 2.58%, and the third and fifth harmonics with higher harmonic content were reduced from 2% to less than 1%, which improved the performance of the inverter.

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Last Update: 2022-01-09