Grid Tied System.

GRID TIED SOLAR PV
A Grid Tied Inverter or a (GTI) is the brain of a Grid Tied System. The inverter allows a direct connection between the DC solar array and main utility AC power grid. This means that PV system can operate without batteries. The DC power generated by the solar modules is inverted to higher voltage AC and pushed back to the utility grid which either generates income under Gross Feed In Tariff scheme or lower the monthly electric bill.Grid tied inverter work just like a conventional DC-AC inverter. They will take the input DC power, step it up, filter it into a pure sine wave, and feed it back in to the AC grid. The step up is done via high frequency DC-DC converter (PWM controlled inverter), and the filtration is done via inductors and capacitors. The electricity flows back the other way because the output voltage is slightly higher than the AC grid voltage.

Effects on the grid power quality

In order for grid tie inverters to comply with utility electrical standards, the output power needs to be clean, undistorted and in phase with the AC grid. Typical modern GTI’s have a fixed unity power factor, which means its output voltage and current are perfectly lined up, and its phase angle is within 1 degree of the AC power grid. The inverter has an on board computer which will sense the current AC grid waveform, and output a voltage to correspond with the grid.

 

HOW DOES EVERYTHING CONNECT?
In a grid-tied system, the

  • Sunlight is converted into DC electricity by your solar panels.
  • Grid tied inverter then transforms the DC electricity into 240V AC sending it to mains through a Gross meter.
  • Your residence gets power from your mains switchboard through another meter.
  • While the sun is shining you are feeding electricity from your solar inverter into the grid, through the gross meter.
  • When the sun goes down the inverter switches off and no electricity is pushed to the electrical grid.
  • At sunrise the inverter switches on and starts exporting 240V AC electricity back into the electrical grid.
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