Combustion turbine power generation system and method of controlling the same

A control method of a combustion turbine power generating system including an AC power generator, a combustion turbine that drives said AC power generator, a first converter that can make conversion between AC and DC and having an AC side connected to said AC power generator, a second converter that can make conversion between AC and DC and having a DC side connected to a DC side of said first converter, a capacitor connected between said first and second converters, a circuit breaker connected between an AC side of said second converter and an electric power system, generator-speed control means that controls said first converter, DC voltage control means that controls a DC-side voltage of said second converter, and combustion turbine control means that controls said combustion turbine,

• wherein said combustion turbine control means obtains state quantity of said combustion turbine and supplies an optimum number of revolution command value of said AC power generator obtained from said state quantity to said generator-speed control means, so that said generator-speed control means controls said first converter on the basis of said optimum number of revolution command value and controls the number of revolutions of said AC power generator.

A control method of a combustion turbine power generating system, wherein

• said generator-speed control means includes means that detects an output current of said AC power generator, when a detected current value of said AC power generator exceeds a predetermined value, said optimum number of revolution command value is modified to change the number of revolutions of said AC power generator.