Table 6 Laboratory prototype Components. The proposed circuit has an PV input voltage of 40 V and its output terminals are coupled to a load of 60 Ω. The measured voltage is displayed in Fig. 27, The inverter’s output voltage approximately equals 50 VRMS and The mean input current is 1.3 A.
The intermediate capacitor voltage is regulated at a constant average value of 100 V as shown in Fig. 24 this enables the inverter stage to output a suitable AC voltage. Lastly, the inverter output waveforms are illustrated in Fig. 25. 60 Ω is the load the inverter supplies.
The Buck-Boost inverter input ranges from 35 V to 117 V. This estimation agrees with the range of operation proposed in 30 (40–100 V). However, the proposed topology can accommodate higher input voltage (up to 270 V), thus it has a wider range of operation and more versatile.
For a fair comparison with the proposed microinverter topology, a practical limit for the input PV module voltage and current is set as 35 V and 2 A. Also, the ripple is limited to a maximum of 20 V, the different constraints for both circuits are taken into account and the feasible region of operation is presented in Fig. 5.
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The buck-boost type of inverter can achieve different voltage levels for stand-alone as well as grid connected applications.
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