Solar PV power plant- on grid and off grid

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Solar PV Power Plant- on Grid and off Grid

Solar Cell or Photovoltaic (PV) cell is a device that is made up of semiconductor materials such as silicon, gallium arsenide and cadmium telluride, etc. that converts sunlight directly into electricity. When solar cells absorb sunlight, free electrons and holes are created at positive/negative junctions. If the positive and negative junctions of solar cell are connected to DC electrical equipment, current is delivered to operate the electrical equipment

Solar off Grid Power Generation Systems

A) Priority- (solar-grid-battery)

  • When solar energy is sufficient then total o/p load will operate on solar through MPPT & Inverter. Excess solar power will charge batteries.
  • When solar energy is weak then inverter is taking DC source from solar & balance from grid.
  • When solar energy is absent then the entire load is working on grid via grid charger.
  • When grid is absent then the load will be shifted onto batteries and moment the grid energy resumes load will be shifted back to grid. During this sequence any discharge of batteries will be refurbished via grid & available solar.
  • All the operational logic will work with a zero transfer time for sensitive loads.

B) Priority- (solar-battery-grid)

  • When solar energy is sufficient then total o/p load will operate on solar through MPPT & Inverter. Excess solar power will charge batteries.
  • When solar energy is weak then inverter is taking DC source from solar & balance from batteries.
  • When batteries reach 75% discharge level (25% kept as a buffer) the o/p load is shifted to grid without any change over time.
  • After shifting load to grid the batteries are charged from solar energy and if solar energy not sufficient to charge the batteries, then remaining DC power is taken from grid charger. Once the batteries are fully charged then load is shifted back onto battery backup from grid.
  • During changeover of load from battery backup to grid supply (i.e 75% battery discharged) and if grid supply is absent then load is shifted to inverter to use buffer battery backup (i.e balance 25%)
  • When grid returns during which inverter is working on buffer battery backup then the load is shifted to grid & batteries are charging through solar or grid as per logic explained above.

The above system is applicable for 5 KW and above.

Solar On Grid power Generation systems

string inverter comes with a series of user-focused features includinga high total efficiency that feeds more electricity to the grid thereby generating higher revenues; built-in protection, which reduces the need for costly external devices; a compact design that frees-up space for other equipment;and an intuitive and easy to read control unit that can be mounted within the inverter enclosure or remotely

Highlights

  • High total efficiency
  • Built-in and monitored system protection devices
  • High maximum input voltage
  • Wide DC input voltage range
  • Detachable control unit with graphical display
  • Integrated performance data monitoring
  • Outdoor IP55 enclosure with additional safety features

Advantages of solar power

  • The energy and heat from the sun is free and unlimited.
  • Solar power is non-polluting. Solar power usage does not emit any greenhouse gases or harmful waste.
  • Solar power is perfect and saving for power generation in remote areas or where the cost of expansion utility grid is high.
  • Solar power is versatile. It can be used for low-power purpose as well as larger ones - from hand-held calculators, watches, and solar powered garden lights to water heaters, cars, buildings and satellites.
  • Solar power system requires very little maintenance and last for many years.
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