Some loads, found in mines have a peak power demand much larger than their average demand. These transient and cyclic loads put excess strain on generators, transmission lines and transformers.
Certain generators, e.g. gas reciprocating and gas turbine generators, don’t operate well with these transient or cyclic loads, sometimes requiring expensive reciprocating diesel generation to alleviate the problem.
Fluctuating loads can reduce the efficiency of the generator causing increased fuel consumption and maintenance costs.
Sometimes financial penalties are applied by the power utility if the site is connected to the national or strong power grid where power quality disruptions have been experienced by neighbours.
On the end of long feeders, it can be the case that starting large crushers or mills is just not possible due to the inability of the line to cope with the short-term power demand.
PowerStore has been specially designed to overcome these transient and cyclic loads by responding to fluctuations within milliseconds.
PowerStore can disperse and consume power for short durations of time and is also able to provide voltage support through the use of reactive power injection.
Voltage will always stay within the set limit by using this power quality control system regardless of unpredictable operations and equipment demands.
By providing a containerised solution, the modular design of PowerStore enables an unlimited number of PowerStore units to be connected in parallel. Power output of single units range from 250kW to 1MW.
The energy contained in each PowerStore system can be adapted to site specific needs. The containerised solution also allows the system to be retrofitted into another application after the completion of the project.
The Leinster Nickel Operation is an underground mining operation, incorporating a large electrically driven winder to extract the ore from 1000m down in the mining pit.
This winder is the epitome of a cyclic load, demonstrating 8.5MW of demand shift over a period of 120 seconds, even though the average power consumption over time is just 2MW.
Due to this demand shift, diesel generation is always required to be run at the independently operated power supply, dramatically increasing the cost of power to the site.
The planned installation of just one 1MW PowerStore container, later in 2005 is expected to reduce the total demand shift from 8.5MW down to 6.5MW, allowing the independent power provider to reduce the amount of diesel based spinning reserve by at least one 1MW generator.
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