List of various Schemes of grid tied roof top solar pv system

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Scheme-A : Grid tied roof top solar PV system without battery

This is a simplest scheme of the grid tied rooftop solar system. In this arrangement inverter which is heart of the entire solar system continuously supervises the grid condition and in the event of grid failure or under voltage or over voltage, the solar system is disconnected by the circuit breaker /auto switch provided in the inverter. Since there is no back up in the solar system, it cannot supply the consumer load in the event of grid failure because the load is continuously varying in nature.

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1. Switch S (built in Inverter) will open out automatically in grid failure and closes on its restoration after a time delay
2. Tariff for operators of solar roof top devices shall be based on feed tariff fixed by Regulator, both on solar power consumed by operator and the solar power fed into the grid i.e SE
3. CI=Consumer Import, GI/GE=Grid Import & Export, SE/SI=Solar export and Import, SW –Manual Lockable switch for grid maintenance

Scheme-B:Grid tied roof top solar PV system with full load Battery back up

In this scheme when the grid is available consumer loads will be fed from grid side and solar system is connected to grid through its inverter. Solar iscontinuously feeding the grid. In this arrangement battery and inverter cum charger (which may be available in the consumer house) is also shown. The DC generated form solar is first converted to AC and than it is connected to other equipments/grid. When grid fails automatic disconnection from the grid side takes place and solar is connected to battery system and AC consumer load directly through another switch which operates after a time delay.

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1. Switch S (built in Inverter) will open out automatically in grid failure and closes on its restoration after a time delay
2. Tariff for operators of solar roof top devices shall be based on feed tariff fixed by Regulator, both on solar power consumed by operator and the solar power fed into the grid i.e SE
3. CI=Consumer Import, GI/GE=Grid Import & Export, SE/SI=Solar export and Import, SW –Manual Lockable switch for grid maintenance

Scheme-C : Grid tied roof top solar PV system with partial load Battery back up

Under this scheme also, the basic operation will be same as given in for scheme-II but bus splitting is necessary in the even of grid failure so as to supply critical loads as battery back up is not sufficient to feed the entire consumer load. In the event of grid failure or under voltage or over voltage, inverter will disconnect the grid supply and connect the inverter with emergency panel. Battery system shall supply the emergent loads and battery will be charged depending on availability of solar power.

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1. Switch S (built in Inverter) will open out automatically in grid failure and closes on its restoration after a time delay
2. Tariff for operators of solar roof top devices shall be based on feed tariff fixed by Regulator, both on solar power consumed by operator and the solar power fed into the grid i.e SE
3. CI=Consumer Import, GI/GE=Grid Import & Export, SE/SI=Solar export and Import, SW –Manual Lockable switch for grid maintenance

Scheme-D:Grid tied roof top solar PV system with full load DG backup system

All the equipment envisaged in the Scheme-A would be provided in this scheme as well, however, in addition there is second line of defense and DG set is also envisaged because in some parts of the country, the grid supply is not very reliable and is erratic. The operation of this scheme would be similar to module A but in addition provision is kept for consumer DG set. In case the failure of utility grid the solar PV system shall be disconnected form the grid and DG shall start. Once DG is started the solar system shall also be connected to the AC bus after synchronization with the DG set. DG set will be automatically disconnected in the event of grid supply is restored.

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1. Switch S (built in Inverter) will open out automatically in grid failure and closes on its restoration after a time delay
2. Tariff for operators of solar roof top devices shall be based on feed tariff fixed by Regulator, both on solar power consumed by operator and the solar power fed into the grid i.e SE
3. CI=Consumer Import, GI/GE=Grid Import & Export, SE/SI=Solar export and Import, SW –Manual Lockable switch for grid maintenance

Scheme-E: Grid Interactive Solar PV System With Partial Load DG Backup

Under this scheme also, the basic operation will be similar to that under Scheme-D. Only AC bus segregation in the consumer premises would be necessary to supply critical loads during grid failure.

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1. Switch S (built in Inverter) will open out automatically in grid failure and closes on its restoration after a time delay
2. Tariff for operators of solar roof top devices shall be based on feed tariff fixed by Regulator, both on solar power consumed by operator and the solar power fed into the grid i.e SE
3. CI=Consumer Import, ,GI/GE=Grid Import & Export, SE/SI=Solar export and Import, SW –Manual Lockable switch for grid maintenance

Scheme-F: Grid Interactive Solar PV System With Full Load Battery and DG Backup

In this arrangement solar PV system will remain tied up with the utility grid as long as supply from the grid is available. In the event of supply failure or low voltage or over voltage solar system will be disconnected from the grid and DG system will start. Once the DG set is started and solar generation is possible the solar system shall be again connected to the system. In the event of restoration of grid supply the solar system shall be again connected to main grid. All the control operations shall be performed by the inverter connected to solar system.

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1. Switch S (built in Inverter) will open out automatically in grid failure and closes on its restoration after a time delay
2. Tariff for operators of solar roof top devices shall be based on feed tariff fixed by Regulator, both on solar power consumed by operator and the solar power fed into the grid i.e SE
3. CI=Consumer Import, ,GI/GE=Grid Import & Export, SE/SI=Solar export and Import, SW –Manual Lockable switch for grid maintenance

Scheme-G: Grid Interactive Solar PV System With Partial Load Battery and DG Backup

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1. Switch S (built in Inverter) will open out automatically in grid failure and closes on its restoration after a time delay
2. Tariff for operators of solar roof top devices shall be based on feed tariff fixed by Regulator, both on solar power consumed by operator and the solar power fed into the grid i.e SE
3. CI=Consumer Import, GI/GE=Grid Import & Export, SE/SI=Solar export and Import, SW –Manual Lockable switch for grid maintenance.

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