Supercritical carbon dioxide cycle has many advantages such as small turbine size

small compressor power consumption and high cycle efficiency. In order to explore the cycle configuration with the highest power generation efficiency after the power generation system of supercritical carbon dioxide cycle coupled gas turbine

four cycle layouts were proposed. The main parameters of the circulating system were optimized by genetic algorithm with the maximum circulating efficiency as the optimization objective. Among the four schemes

the gas turbine/two-turbine supercritical carbon dioxide combined cycle system has the highest cycle efficiency

which is 44.87%. And the dynamic system analysis of the scheme

with the bottom cycle input heat load as the disturbance variable

explore the dynamic response of the system after the step reduction from full load to 90% load

80% load and 70% load respectively. The results show that the response time of parameters near the flue gas heat exchanger is faster and the response time is longer when the shadow of thermal inertia is farther away from the flue gas heat exchanger in the working medium flow. At the same position

the response time of pressure is slightly longer than that of temperature

and the drop range of parameters near the high-temperature turbine is greater than that of the low-temperature turbine.