Design of LCL Filter in Front End Converters Suitable for Grid Connected Wind Electric Generators

摘要

The design of LCL filter is cumber some, still interesting to know the facts and figures of it in the wind industry. To reduce the bulky inductor size, minimize the grid current ripple and to mitigate the effects of distortion due to high switching frequency in the inverter by Space vector modulation. Apart from this, by the implementation of suitable designed LCL filter, the grid power factor is enhanced with minimum voltage dissipation across the filter and permissible loss in the damping resistor with low electromagnetic interference This paper summarizes the filter design along with the mathematical expressions to prove the design procedure. It also gives the dynamic model of filter with simulation using Simulink/MATLAB. The transfer function of the LCL filter in grid side is computed and the subsequent frequency domain approach using Bode plot has been presented. The total harmonic distortion with reduced ripple component is observed in the grid current for various filters are shown in the simulated results.