A GRID CONNECTED SOLAR PHOTOVOLTAIC INVERTER WITHOUT AN OUTPUT FILTER USING HARMONIC MINIMIZING TECHNIQUE

Electrical and Electronics Engineering

This paper presents a sine-wave modulation technique to achieve low total harmonic distortion (THD) of a buck–boost converter connected to a changing polarity inverter. A PWM technique is used to achieve the low total harmonic distortion (THD) at the output of inverter during the construction of pulses to the converter switches. By using PWM modulation techniques we can minimize harmonics generated by the PWM technique itself. First, we present converter topology characteristics with PWM techniques. Then we describe how a suggested modulation minimizes harmonic generated by switching operation, the inductive nature of the DC source and external point at which the converter is connected. As compared with the previously modulation technique, a suggested modulation achieves the THD is less than 6%. Then, we describe how the suggested modulation improves the harmonic content of the output in comparison to the previously used technique, whether harmonics are caused by the inductive nature of the source (e.g., domestic wind turbine) or they are created from external sources at the point the converter is connected (e.g., grid). Simulation results the ability of the method to drastically reduce THD, the output complies with the 5% limit without the use of filters.

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