Jung-Rok Lee, Seung Hyu Seo, and Kyo-Beum Lee, "Design of LCL-filter for Grid-Connected Three-Phase Inverters Using a Discontinuous PWM Method," The Transactions of the Korean Institute of Electrical Engineers, vol. 65, no. 3, pp. 419–427, Mar. 2016. > Paper

This paper proposes a design method of LCL-filter for a grid-connected three-phase inverter using a discontinuous PWM (DPWM)

method. When using a DPWM method, many harmonic voltages are generated in the inverter output compared to a continuous

PWM (CPWM) method. Therefor, an optimized grid-connected filter design is required for a DPWM method. The proposed design

method provides generalized formula to design accurate LCL-filter without trial and error procedures. An inverter side inductance is

designed by analyzing the current ripple injected to the grid. The optimized parameters of CLC-filter can be designed by analyzing

the total harmonic distortion (THD) and the ripple attenuation factor of the output current. The proposed LCL filter design method

is demonstrated by simulation and experimental results.