Gas turbine system and a control method thereof

Depending on the operating conditions of the gas turbine system (500A), if it can not use a high pressure hot water generated by using solar heat energy also to provide a gas turbine system which meets such a requirement of the output increases. A gas turbine system (500A), to generate a first high-pressure hot water heat collecting apparatus utilizing solar heat (200), a part of the combustion exhaust gas of the gas turbine (103), open the damper (110a) exhaust introduced into the heat exchanger (130) through the duct (110A), for generating a second high-pressure hot water in the heat exchanger (130). The flow regulating valve (129), spraying the high-pressure hot water during inspiration (106) for sucking in the control to the compressor in the control device the opening degree of the (132) (145A) (101).