Boots – shoes – and leggings
Patent
1994-11-07
1996-10-15
Trammell, James P.
Boots, shoes, and leggings
364483, 364495, 364578, 364102, 307102, H02J 304
Patent
active
055660851
ABSTRACT:
A transient or voltage stability transfer limit is calculated for a power network having at least two independent AC generators supplying a common load via separate AC transmission lines having at least one bus. Steady state values for variable characteristic electrical parameters of variable elements of the network are determined based on particular values for power transferred by the transmission lines. Static values for passive characteristic electrical parameters of passive conductive elements of the network are determined. A contingency resulting in a sudden change of at least one of the variable electrical parameters and the passive electrical parameters is selected. A post contingency steady state value for a voltage at one of the buses is calculated. A voltage over time during a transition period at the bus is calculated, the transition period extending in time from a start of the contingency through a discontinuity during which the voltage is abnormally altered, and recovery during which the voltage will tend toward a steady state terminal value. An integral sum of squares of a difference between the post contingency steady state voltage and the transition period voltage over the transition period is calculated to obtain an energy value. Using two such energy values from two power values, a transfer limit estimate for the transmission line is obtained as being an asymptote of the energy values, the energy values being an inverse function of the stability limit less the power value.
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Galiana Francisco D.
Mailhot Richard
Marceau Richard J.
Hydro-Quebec
Miller Craig Steven
Trammell James P.
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