In On-Grid (Grid Tie) Solar Power Plants, the solar power produced by solar panels is directly connected to Grid i.e. Electric line (AC) by the inverter. The main advantage of this system is that there is no need for batteries. The main parts of On-Grid Solar Power Plant are – Solar PV Modules, Grid Tie Inverter and Mounting structure.
Rooftop On-Grid Solar Power Plant: How it works?
Solar PV rooftop system is basically a small power plant at your rooftop. The Grid interactive Roof Top Solar Photo Voltaic (PV) mainly consists of three major components. These are the solar PV modules, mounting structure for the modules and the inverter or power conditioning units. Solar PV modules form an array and it requires a mounting structure to hold PV modules at the required angle for maximized generation. The solar panels convert solar energy in the form of light into electricity in DC form (Direct Current). The DC electrical energy is converted to AC (Alternate Current) power by the inverter/power conditioning unit which is connected to the power grid through AC distribution board. The AC power output can be measured through metering panel connected to it. The 415 V AC output of the system can be synchronized with the grid and the electricity can be exported to the grid depending upon solar power generation and local consumption.
Electrical inverters convert direct current generated from solar PV modules to alternating current. Therefore, solar modules need to be connected to inverters. Nowadays we have smart Grid-interactive inverters. These inverters can produce AC power that matches voltage and frequency of the grid and the power line it connects to. There is another requirement of adding an isolation transformer. For safety purposes, isolation transformer is used to transfer electrical power from inverter to the connected load while isolating the load from the power source. In addition, the injection of DC power into the grid can be avoided by using an isolation transformer at the output of the inverter.
Power generated from the rooftop solar system during the daytime can be utilized fully by powering the building loads and feeding excess power to the grid as long as grid is available. Whenever, solar power is not available due to shadow or a cloudy day, the building loads can be served by drawing power from the grid or DG sets. Smart inverters automatically understand the power situation and always give preference to power generated from solar modules.
Benefits of Rooftop Solar PV systems:
1. Cost Effective with high efficiency
2. No Fuel cost, as the solar energy is free
3. No battery, so very less maintenance cost
4. 80% depreciation
5. Pollution - Free system
Where we can use On-Grid Solar Power Plant:
Ideal for Home, Factory, Office, School, Collages, Hostel, Hotels, Hospitals, Agriculture Dairy & Food Processing, Government Offices, Petrol Pumps, Water Pumping Systems and Distant locations