Design and implementation of MPPT based charger of wheelchair batteries using Photovoltaic Arrays
Radhika Vaid, Vaibhav Maheshwary, Sharang Mittal Abstract The development of renewable energy for the generation of electric power has been a critical topic in the current century with the growing problem of global warming and other environmental issues. Recently solar power has become a practical source for the generation of electricity worldwide. However the PV cell output is relatively low for commercial purposes. Thus, Maximum Power Point Tracking (MPPT) plays a crucial role in photovoltaic systems because they increase their efficiency by increasing the power output and reduces the cost by reducing the number of PV panels required to achieve the desired power. As the output power from the solar panel is dependent on solar irradiance and temperature, so in order to increase the power extracted …show more content…
Voc is the open-circuit voltage at the terminals of the panel. Isc is the short-circuit current which is the maximum current that can be obtained by the panel. Vmpp and Impp are the voltage and current values at the maximum power that can be obtained by the panel. The maximum power output is located at the point on the knee of the I-V curve and this point is called the Maximum Power Point (MPP).
Fig.2. I-V Characteristics of Solar Panel
The variation of I-V characteristics with sunlight of the solar panel (TABLE I) observed and noted at two different times of the day are shown in Fig.3. At 1:30 pm and Fig.4. At 2:15 pm.
Fig.3. I-V Characteristics of solar panel observed at time 1:30
Radhika Vaid, Vaibhav Maheshwary, Sharang Mittal Abstract The development of renewable energy for the generation of electric power has been a critical topic in the current century with the growing problem of global warming and other environmental issues. Recently solar power has become a practical source for the generation of electricity worldwide. However the PV cell output is relatively low for commercial purposes. Thus, Maximum Power Point Tracking (MPPT) plays a crucial role in photovoltaic systems because they increase their efficiency by increasing the power output and reduces the cost by reducing the number of PV panels required to achieve the desired power. As the output power from the solar panel is dependent on solar irradiance and temperature, so in order to increase the power extracted …show more content…
Voc is the open-circuit voltage at the terminals of the panel. Isc is the short-circuit current which is the maximum current that can be obtained by the panel. Vmpp and Impp are the voltage and current values at the maximum power that can be obtained by the panel. The maximum power output is located at the point on the knee of the I-V curve and this point is called the Maximum Power Point (MPP).
Fig.2. I-V Characteristics of Solar Panel
The variation of I-V characteristics with sunlight of the solar panel (TABLE I) observed and noted at two different times of the day are shown in Fig.3. At 1:30 pm and Fig.4. At 2:15 pm.
Fig.3. I-V Characteristics of solar panel observed at time 1:30