Operation of a gas turbine comprising an interpolated operating curve deviation

An operating method for a gas turbine during partial load operation, comprising the following steps:

• specifying a setpoint value of a first parameter at a predetermined value of a second parameter different from the first parameter, wherein the first parameter is one of a temperature and a power output of the gas turbine and wherein the second parameter is one of the temperature and the power output;
• determining two operating curves of the temperature or power output as a function of the respective power output or temperature of the gas turbine, wherein the setpoint value of the first parameter is arranged between these operating curves;
• determining the difference of the first parameter of these two operating curves at the essentially constant, predetermined value of the second parameter;
• determining a deviation of the predetermined set point value of the first parameter from one of the two operating curves at the essentially constant, predetermined value of the second parameter;
• calculating an interpolated operating curve deviation on the basis of the difference of the first parameter and the deviation of the setpoint value of the first parameter, wherein the interpolated operating curve deviation has a slope that connects the two operating curves, and
• operating, with a control system, the gas turbine according to the interpolated operating curve deviation while switching between the two operating curves,
• wherein the temperature is a turbine exit temperature or a computationally determined turbine inlet temperature, and
• wherein the operating according to the interpolated operating curve deviation is after operation at one of the two operating curves and prior to operation at another of the two operating curves.