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2. MICROCONTROLLER BASED SOLAR PV SYSTEM UPS
Abstract

3. Uninterruptible Power Supply (UPS) systems are being popular and
presently used in commercial, industrial and residential applications.
Presently the UPS system has two major classifications, one is on line
UPS and another one is off line UPS. In both the types the battery system
inside the UPS is charged by the mains AC Supply. A by-pass mode of
operation is also incorporated in the UPS during normal supply. This
paper presents a novel technology to charge the battery using Renewable
Energy Systems (RES) particularly of Solar PV power. Battery charging
can mostly be done by the solar power whereas if the PV power is
inadequate, then the UPS system i.e. the battery is discarded from the
PV panel and automatically connected to EB mains. The inverter in the
UPS system can also replaced by controlled Voltage Source Inverter (VSI).
A prototype of 1-Ph, 1-kVA UPS system has been examined for the above
work. Controlled inverter has been realized by a dedicated PIC 16F877
controller. The output of the inverter has been maintained as 230 V +/-
2% by using PWM technique, which is incorporated in the PIC controller