07-11-2012, 02:40 PM
AVAILABILITY BASED TARIFF(ABT)
AVAILABILITY BASED TARIFF.ppt (Size: 636 KB / Downloads: 51)
Adverse Grid conditions
Wide frequency fluctuations cause serious damages at Generation & load ends.
Low frequency during peak load hours, with frequency going down to 48.0 – 48.5 Hz. for many hours every day.
High frequency during off peak hours, with frequency going up to 50.5 to 51Hz. for many hours every day.
Rapid and wide changes in frequency – 1 Hz. change in 5 to 10 minutes, for many hours every day.
Very frequent grid disturbances, causing tripping of generating stations, interruption of supply to large blocks of consumers, and disintegration of the regional grids.
Solutions identified by CTU
The CTU has stated that the solution to these problems lies in:
Maximization of generation during peak load hours and load curtailment equal to the deficit in generation
Backing down of generation to match the system load reduction during off peak hours, as per merit order of generation.
LGB (Load – Generation balance to be maintained
Applicability
ABT is applicable to
To the generators supplying energy to more than one constituent(i.e.) Central generating stations.
To all the constituents who draw power from central grid.
Concept of availability based tariff
Capacity allocations from generating station to each constituent will be owned by that constituent.
Constituent has to pay full fixed charges for the allocated power.
Constituent can trade the capacity allocated.
Constituent can schedule the energy from each generator as per requirement and Merit Order and can save cost of power purchase.
Unscheduled Interchange (UI) Charges:
In terms of clause (1) of Regulation 5, the charges for Unscheduled Interchanges for all the time-blocks payable for over-drawal by the buyer or the beneficiary and under-injection by the generating station or the seller
and receivable for under-drawal by the buyer or the beneficiary and over injection by the generating station or the seller shall be worked out on the average frequency of the time-block at the rates
(Each 0.02 Hz step is equivalent to 15.5 paise/kWh in the 50.2-49.7 Hz frequency range and
47.0 Paise/kWh in the 49.7-49.50 Hz frequency range).
Features of the Special Energy Meters (SEM)
SEM can record
15 minutes average frequency in between 49.00 to 51.00Hz
15 minutes average net energy transmitted.
Cumulative net energy transmitted.
Net Rkvah transmitted below 97% rated voltage.
Net Rkvah transmitted above 103% rated voltage.
Meter has a non- volatile memory and can automatically store average frequency, net energy transmitted in 15 minutes time block cumulative energy and cumulative Rkvah at each midnight.
The above data can be stored only for 10 days.
AVAILABILITY BASED TARIFF.ppt (Size: 636 KB / Downloads: 51)
Adverse Grid conditions
Wide frequency fluctuations cause serious damages at Generation & load ends.
Low frequency during peak load hours, with frequency going down to 48.0 – 48.5 Hz. for many hours every day.
High frequency during off peak hours, with frequency going up to 50.5 to 51Hz. for many hours every day.
Rapid and wide changes in frequency – 1 Hz. change in 5 to 10 minutes, for many hours every day.
Very frequent grid disturbances, causing tripping of generating stations, interruption of supply to large blocks of consumers, and disintegration of the regional grids.
Solutions identified by CTU
The CTU has stated that the solution to these problems lies in:
Maximization of generation during peak load hours and load curtailment equal to the deficit in generation
Backing down of generation to match the system load reduction during off peak hours, as per merit order of generation.
LGB (Load – Generation balance to be maintained
Applicability
ABT is applicable to
To the generators supplying energy to more than one constituent(i.e.) Central generating stations.
To all the constituents who draw power from central grid.
Concept of availability based tariff
Capacity allocations from generating station to each constituent will be owned by that constituent.
Constituent has to pay full fixed charges for the allocated power.
Constituent can trade the capacity allocated.
Constituent can schedule the energy from each generator as per requirement and Merit Order and can save cost of power purchase.
Unscheduled Interchange (UI) Charges:
In terms of clause (1) of Regulation 5, the charges for Unscheduled Interchanges for all the time-blocks payable for over-drawal by the buyer or the beneficiary and under-injection by the generating station or the seller
and receivable for under-drawal by the buyer or the beneficiary and over injection by the generating station or the seller shall be worked out on the average frequency of the time-block at the rates
(Each 0.02 Hz step is equivalent to 15.5 paise/kWh in the 50.2-49.7 Hz frequency range and
47.0 Paise/kWh in the 49.7-49.50 Hz frequency range).
Features of the Special Energy Meters (SEM)
SEM can record
15 minutes average frequency in between 49.00 to 51.00Hz
15 minutes average net energy transmitted.
Cumulative net energy transmitted.
Net Rkvah transmitted below 97% rated voltage.
Net Rkvah transmitted above 103% rated voltage.
Meter has a non- volatile memory and can automatically store average frequency, net energy transmitted in 15 minutes time block cumulative energy and cumulative Rkvah at each midnight.
The above data can be stored only for 10 days.