Title :
LCL filter design for grid-connected inverters by analytical estimation of PWM ripple voltage
Author :
Sahoo, Abhaya Kumar ; Shahani, Arushi ; Basu, Kaustav ; Mohan, Ned
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Minnesota, Minneapolis, MN, USA
Abstract :
LCL filter is becoming an attractive choice over conventional L filters for grid-connected voltage source inverters (VSI) due to smaller inductor size and better attenuation of the ripple components in the grid current. The modulation of the VSI generates switched voltages which results in distorted currents. In this paper, a simple closed form analytical expression is derived for the higher order switching components present in the inverter voltage. This is used in a systematic design procedure to design the LCL filter components for allowable grid current harmonics. A passive damping resistor is designed ensuring minimum power loss. The design is validated by simulations in MATLAB/Simulink and experiments on a laboratory prototype.
Keywords :
filtering theory; invertors; power grids; power harmonic filters; power inductors; resistors; LCL filter design; MATLAB-Simulink; VSI; analytical PWM ripple voltage estimation; distorted currents; grid current harmonics; grid-connected voltage source inverters; higher order switching components; inductor size; minimum power loss; passive damping resistor; ripple component attenuation; switched voltage generation; systematic design procedure; Damping; Inverters; Modulation; Reactive power; Switches; Switching frequency; Vectors; Passive input filter; Space vector pulse-width modulation (SVPWM); Total harmonic distortion (THD); Voltage source inverter (VSI);
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE
Conference_Location :
Fort Worth, TX
DOI :
10.1109/APEC.2014.6803471
