Abstract
This paper introduces a DC-AC inverter design that operates stand alone to deliver power from solar photovoltaic (PV) to the load directly without going through the battery. In batteryless solar PV, the output voltage of solar PV always varies according to solar irradiation, temperature, so that it becomes a challenge in modelling DC-AC inverter with constant output voltage. The design consists of a boost converter, h-bridge switching and driver, and LC filter to generate sinusoidal ac voltage as output to load. To ensure a constant inverter output voltage, the design equipped by a close loop PI controller based on voltage control mode. The design modelled and simulated by PSIM. PV dc input was set variation according to the irradiation value (W/m2) and the output connected to a load that has rated voltage of 220 Vac and 3.4 A of nominal current. The results show that in the irradiation variation 600-1500 W/m2, the inverter was able to maintain the output voltage of 220 Vac ± 0.91%, 50 Hz which is still in the voltage range based on standard. The efficiency produced by DC-AC inverter 97.7 % at 600 W/m2 and 83.6 % at 1500 W/m2.
Highlights
Utilization of solar PV or solar cells as energy resources are increasingly being discussed over last decade
The use of solar PV must still be integrated with other equipment such as solar charger controller (SCC), batery and inverter to supply household electrical appliances that mostly use large ac voltage according to utility grid voltage (220 Vac, 50 Hz), [3,4,5,6]
In order for the efficiency of power generated by solar PV match with the load impedance in all weather conditions, it’s required the maximum power point tracking (MPPT) performance by DC-DC converter [7]
Summary
Utilization of solar PV or solar cells as energy resources are increasingly being discussed over last decade. This technology is considered as an alternative source of environmentally friendly energy that is expected to replace conventional energy sources based on petroleum and coal. The existence of government support in electricity utilization based on renewable energy and technological improvements can stimulate the use of solar PV more affordable for the future [1, 2]. The dc voltage generated by solar PV is always changing every time due to the irradiation and ambient temperature impacts that affect the power produced. Through MPPT the power fluctuation from solar PV can be stored into the battery, through
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