21-11-2012, 02:02 PM
STUDY OF DESIGN OF SINGLE PHASE INVERTER FOR SOLAR HOME LIGHTING SYSTEM
STUDY OF DESIGN.ppt (Size: 2.07 MB / Downloads: 90)
AIMS AND OBJECTIVES
The aims and objectives of the present work are as under-
To develop a single phase inverter for solar home lighting system purchased for the Department of Electrical Engineering, VNIT, Nagpur.
To verify the working of the inverter by connecting CFLs as load.
To observe the output voltage waveform under various load conditions.
To find the efficiency of the inverter and plot the output vs efficiency curve.
To find the Total Harmonic Distortion (THD) of the proposed inverter.
Motivation
Emerging Renewable Energy Technology
Keeping in view power crises in the India, everyone is keen to adopt it.
Nagpur is going to be solar city in future. (MNRE)
Immediate return and cost saving technology over life.(Life Cycle Cost Saving)
Easy to adopt with less efforts
No INVERTER is purchased for Dept.Solar PV system.
GENERAL DESCRIPTION OF INVERTER DESIGN
Block diagram consists of solar panel, solar charge controller, battery ,oscillator-cum-divider, driver, inverter transformer and power amplifier
The battery is charged through the PV module through solar charge controller. Solar charge controller prevents over charging and deep discharging of battery.
EXPLANATION
The battery is charged through solar module and is connected to the circuit. The terminals of the battery should be connected properly.If the reverse situation occurs,LED1 glows to indicate the wrong polarity.
(Refer Figure ).
If the switch S is closed, the LED3 glows to indicate power ‘ON’ and 12 V d.c. reaches regulator IC 7805.The output of IC 7805 is fed to the oscillator-cum-divider.
For indication of low battery level, a dual operational amplifier IC LM358 has been used. Fixed reference voltage of 5.1V is applied to the positive input, while sensing voltage is applied to its negative input.
DRIVER CIRCUIT
One of the outputs of IC 7473 is coupled to the base of T1 through diode D1 via series limiting resistance.
Another output at pin 9 is coupled to the base of T2 through diode D2 via other series limiting resistance.
The transistors T1 and T2 are acting as a MOSFET drivers. When T1 conducts T2 is in cut off and vice versa.