Handbook of Energy Storage for Transmission or ... - W2agz.com
Handbook of Energy Storage for Transmission or ... - W2agz.com
Handbook of Energy Storage for Transmission or ... - W2agz.com
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EPRI Proprietary Licensed Material<br />
Regenesys Electricity <strong>St<strong>or</strong>age</strong> Technology<br />
inactive, the Regenesys system could be brought to a state <strong>of</strong> charge that would make up <strong>f<strong>or</strong></strong> an<br />
inefficiencies and imbalances in energy charged and discharged.<br />
A Regenesys energy st<strong>or</strong>age system would be particularly suited to the area/frequency regulation<br />
application because <strong>of</strong> the high cyclability (capability to be charged and discharged at all states<br />
<strong>of</strong> charge without degradation) and the long expected life under the conditions expected.<br />
<strong>Transmission</strong> Customer Power Quality, Power Reliability<br />
A variety <strong>of</strong> loads--ranging from modest industrial installations to substations <strong>of</strong> significant<br />
capacity--require energy to provide power quality and backup power. This energy is used <strong>f<strong>or</strong></strong> a<br />
variety <strong>of</strong> conditions such as when momentary disturbances require real power injection to avoid<br />
power interruptions. In the case <strong>of</strong> industrial customers, a local source <strong>of</strong> power may be required<br />
when there is an interruption <strong>of</strong> power from the utility. This power source may function until the<br />
power feed from the utility is rest<strong>or</strong>ed, until a reserve generat<strong>or</strong> is started, <strong>or</strong> until critical loads<br />
are shut down in a safe manner. In the case <strong>of</strong> a substation, a variety <strong>of</strong> momentary disturbances<br />
such as lightning strikes <strong>or</strong> transmission flashovers cause power trips <strong>or</strong> low voltages. The total<br />
energy st<strong>or</strong>age requirement is greater and there may be a need power flow separation to insure<br />
continuous power to imp<strong>or</strong>tant customers.<br />
Costs and Benefits<br />
Projected Costs<br />
In Table 2, we show projections <strong>f<strong>or</strong></strong> the costs <strong>f<strong>or</strong></strong> Regenesys energy st<strong>or</strong>age plants at two levels<br />
<strong>or</strong> production: a first <strong>com</strong>mercial plant (i.e., the plant after the one <strong>f<strong>or</strong></strong> TVA) and full<br />
implementation (say the 30 th plant sold with sales <strong>of</strong> 10 plants per year). The costs shown, which<br />
are Symons/EECI projections based on values obtained from Innogy publications <strong>or</strong> from Innogy<br />
personnel, relate to a plant with a nominal power capability <strong>of</strong> 10MW and an energy st<strong>or</strong>age<br />
capacity <strong>f<strong>or</strong></strong> a 10-hour discharge <strong>of</strong> 100MWh.<br />
The columns headed $/kWh and $/kW in Table 2 relate to the p<strong>or</strong>tions <strong>of</strong> the total cost that can<br />
be attributed to energy capacity and power capability, respectively. Thus, to estimate the cost <strong>of</strong><br />
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