METHOD OF CONTROLLING FREQUENCY CORRECTION CHANNEL OF SYSTEMS FOR AUTOMATIC CONTROL OF FREQUENCY AND POWER OF GAS-TURBINE POWER PLANTS WHEN SEPARATING INTO AN ISOLATED REGION

摘要

FIELD: turbines or turbomachines.;SUBSTANCE: invention relates to gas turbine power plants (GTP) and can be used in development or modernization of GTP automatic control system (ACS) operating in power system in case it is isolated completely or partially to insulated area. Technical problem consists in improvement of reliability of GTP operating in power system at its separation completely or partially to isolated area. Said technical result is achieved as a result of method of frequency correction of standard channel of gas turbine power plants, including steps of increasing the rate of the primary power of the gas turbine when the mains frequency deviates to the maximum permissible level for reliable operation of the power unit, through dead zone in frequency correction channel, which is part of combined speed/power control of gas turbine, difference of values of preset rotor speed n_set. is performed and current value of rotor n_cur., said difference is multiplied by 1, with switched frequency correction channel or by 0 with disconnected, obtained value of rotation frequency signal of rotor is added to simulate deviation of frequency n_im and divide by coefficient k for recalculation into relative units; in the gas turbine frequency correction channel the logic of the differentiating link is added, at which the received signal is supplied to the circuit of new logic, which calculates the difference between the current signal and the delayed signal with the help of an aperiodic link with parameter of 1 s, the received signal passes through the block of dead zone of the circuit of new logic and is multiplied by the coefficient of new logic K, the signal received as a result of this conversion is transmitted to the adder and further to the limiter of limit values.;EFFECT: technical result consists in improvement of reliability of maintenance of power units of steam and gas plant network frequency during isolation to isolated area.;6 cl, 5 dwg