A New Approach on Harmonics and Interharmonics Reduction with Frequency Selective Closed-Loop Control in General VSI Inverters

In order to describe the generation of harmonics and interharmonics (that are defined as non-integer multiplies of fundamental or switching frequencies and have several different effects in power utility connected VSI systems compared to known harmonics) in generalized power converters, a new approach is proposed based on the "Non-Linear Modulator" concept in frequency-domain; and the analytical model is derived and discussed for commonly used control scheme of d-q reference frame. Afterwards, several effects of feedback control and compensation blocks are explained, analyzed and simulated. Moreover, experimental results are also provided to approve the validity of analysis and simulation.

Keywords:

VSI , CSI , PCC , PWM signal