Power Quality of PV Multilevel Inverters in Residential Environment

Abstract

The aim of the paper is to perform a comparative analysis of power quality for several PV multilevel inverters operating in residential environments. Two cases are presented, namely a diode-clamped multilevel inverter and a cascaded H bridge multilevel inverter which are compared with the situation of a pure sinusoidal supply regarding the voltage, the current and the instantaneous power waveform shapes. The waveforms are synthesized and uploaded in a programmable power source and are applied to a 40 W / 459 lx LED luminaire load. The harmonic limits check according to the standard IEC 61000-3- 2:2018, Class C, regarding lighting equipment are also presented. The measurements revealed that a filter retrofitting method was needed in order to obtain compliance with the power quality standard requirements