ABSTRACT
Grid-tied distributed photovoltaic grid transformer (DPV-GT) systems provide a voltage supply that is never a pure sine wave. DPV-GT systems are subjected to disturbances in the form of harmonics and interharmonics that are superimposed on the supply voltage. DPV-GTs are subjected to waveform distortions due to harmonics that are induced into the system by the inverter mechanism. The solar inverter system's typical harmonic content is less than 1", which has almost no impact on the system. Harmonics are AC voltages and currents with frequencies that are integer multiples of the fundamental frequency. Decomposing a distorted waveform into its harmonic components is considerably more difficult. This process requires Fourier analysis, which involves a fair amount of calculus. The Fourier spectrum analysis provides the power embedded in each of the frequency components of the power signal being handled. Harmonics are either current or voltage components of frequencies which are multiples of the fundamental frequency and are superimposed on the fundamental waveform.
