Design of LCL filtered for three-phase inverter

The demand for renewable energy sources such as solar panels and wind turbines is increasing as energy use increases. Energy obtained from renewable energy sources needs convert and regulate to more proper form. By the use of semiconductor elements, harmonic-containing electrical quantities are obtained by using various filtering methods to obtain clean AC signals. The inverters convert the supplied DC source energy into the AC source energy at the output. Inverter systems are divided into two groups as current source and voltage source. In our study, voltage sourced inverter is preferred because it is widely used. Different pulse width modulation methods such as sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM) are available for the switching operations of the semiconductor elements used. After the simulation study was completed, it was produced and implemented by Delfino TMS320F28335 DSP using SPWM technique. As the output current and voltage signals of the three-phase inverter do not have a clean AC structure, they cause problems such as voltage drops, inefficient motor operation. To eliminate these problems, filters such as active and passive filters are used to improve the quality and efficiency of the AA source energy. Passive filter devices such as L, LC, LCL, LLCL are used at the output of the inverters to suppress the harmonics that will occur at the inverter output and to stay between the specified limits. In this study, LCL filtration method which is one of the filtering methods is aimed for three phase inverter topology. Thus, the harmonics caused by the inverters will be reduced and the three-phase current and voltage will be produced below the harmonic distortion values specified in the IEEE 519 standard.