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Nowadays power demands are continuously increasing and the biggest challenge is to provide stable voltage to consumers under different load conditions. The fluctuation in nominal voltage values affect the performance of attached load. Voltage Stabilizer is a device, which is used to balance the voltages under changing load conditions. However, conventional voltage stabilizers have slow transient response with additional problem of sparking resulting from electromechanical relays. These problems are eliminated using TRIAC based automatic voltage stabilizer. Moreover, these also provide over voltage protection, overload protection and short circuit protection. TRIACs are utilized as switching devices with comparable number of transformer taps. In this research paper, a TRIAC based automatic voltage stabilizer is simulated in Proteus and then designed and implemented using PIC microcontroller. The problems of slow transient response with high sparking of relays in conventional voltage stabilizer have been successfully compensated using TRIAC based automatic voltage stabilizer. The experimental results verify the clam of high quality performance of TRIAC based automatic voltage stabilizer.
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