Method and apparatus for extended operation of steam turbines in islanding mode
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United States of America Patent
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Feb 24, 2015
Grant Date -
N/A
app pub date -
Nov 6, 2013
filing date -
Nov 6, 2013
priority date (Note) -
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Abstract
A steam turbine driven electric power plant with an electric generator is switchable into an islanding mode wherein a main steam turbine is shut down and a lower capacity industrial steam turbine runs the electric generator instead, to supply house power to the plant while decoupled from the power grid. This avoids operating the main steam turbine and/or its steam source at reduced ratings for which they are not optimized and keeps the plant ready for restarting. The main steam turbine, the electric machine and the industrial steam turbine are mechanically engaged or disengaged through an SSS clutch, torque converter and transmission. In another mode, the electric generator is decoupled mechanically and operated as a mechanically unloaded synchronous motor coupled to the power grid, namely as a synchronous condenser wherein phased over- or under-excitation of the motor field windings supplies reactive power to the grid.
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