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Power inverters are devices that can convert electrical energy from DC form into AC form as an output. Inverters can come in many different varieties,
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Power inverters are devices that can convert electrical energy from DC form into AC form as an output. Inverters can come in many different varieties, with different parameters like price, power rating, efficiency, and applications. The DC/AC power inverter normally takes DC power supplied by a solar panel (or) battery, such as a 12-volt battery, and transform it into a 230 volt AC power source operating at 50 Hz, it has emulated the power available at an ordinary household electrical application. Micro solar power systems are designed for the generation of electrical power. They are generally independent of large centralized electric grids and are used in remote areas. By building a grid-tie inverter the household solar power generation systems are connected to the centralized grid system. There is a need to design a low-cost single-phase power inverter that can be used with a small amount of power generation capacity, possibly capable of using small scale solar power generation systems that wish to supply the excess power generated to the electric grid. Operating a renewable energy system in parallel with an electric grid requires a special grid-interactive or Grid-Tie inverter (GTI). The power processing circuits of a GTI are similar to that of a conventional portable DC-AC Converter that operates as a stand-alone device. The main differences are in their control algorithm and safety features. A GTI takes a variable voltage from a DC source, such as a solar panel or battery inverts it to AC synchronized with the mains. It can provide power to our loads and feed an excess of the electricity into the grid. Depending on power and voltage levels, GTIs circuits normally have from one to three stages. When the inverter output is pure sinusoidal and it is connected to the grid. But, to match the frequency, phase, and amplitude of the grid and inverter output. The inverter output depends upon the PWM (Pulse Width Modulation) signals to the gating of the inverter switches. The PWM is generated with the help of the Arduino Atmel 328 controller. Hysteresis current controller is used to adjust the inverter frequency up to the grid frequency. This controller is implemented simply and it provides a good dynamic response and good output current regulation. The project is designed to construct a 200W normal AC Output power and a 250W maximum AC Output power Grid Tie Inverter. The proposed GTI has Over Current Protection, anti-islanding and Reverse Polarity Protection.