| 摘要 |
<p>A method of operating a combined-cycle gas and steam turbine power generating system on a single shaft (16) uses as a feedback to the speed control or governor a signal (22) representing the total power output of the generator less the total output of the steam turbine (12), which is then correlated with the error signal beetween the actual and reference speeds to alter the fuel flow to the gas turbine. By compensating the measured generator output by subtracting a value (24) representative of the steam turbine output so that the compensated signal (26) represents the contribution of only the gas turbine (10) to the generator output, a constant settable droop speed control system may be used in a single-shaft combined-cycle steam turbine and the gas turbine system to compensate for variable heating fuel value and/or changing combustion efficiency in dry low NOx combustion systems.</p> |
