| Popis: |
Considering the output voltage of the PWM inverter from the photovoltaic power plants structure, as being formed by the superposition between a step type alternative voltage, centered in the middle of the alternation and several voltages as pairs of alternative unitary steps, symmetrical related to the central step, proved to be suitable for the analytical treatment of the control and harmonics problems. Thus, the identification of the Fourier series for the centered step type component allowed the application of optimal criteria leading to the determination of the conduction angles, corresponding to them. The analytical expression of the general harmonic, for the Fourier series, is validated through the graphical representations of the centered step component, analytically recomposed for different numbers of harmonics taken into account. A complete analysis of the harmonics is then carried out, extending the calculation to all the indicators considered for an alternating current wave. |
