Abstract: To address such issues as output fluctuation, mismatch between supply and demand, and poor reactive power support caused by the high proportion of new energy in new power system, a solution based on hydrogen gas turbine "power-hydrogen-power" coupled energy storage and peak regulation was proposed, and a double-layer nested optimization model was constructed. Firstly, for outer layer, using the maximization of the project's net present value as the optimization objective, a genetic algorithm was used to determine the optimal capacity configuration of each component within the system. Secondly, for inner layer, aiming to maximize the annual net income as the optimization objective, the outer layer capacity was taken as the input and linear optimization was used to dynamically solve the operation strategies of each component, based on the fluctuation of new energy output and load changes in typical scenarios. Finally, the system performance evaluation was conducted with the meteorological conditions of the large new energy base in China's northwest region and typical industrial load conditions as the calculation boundaries. The results show that the annual abandoned power rate of the power-hydrogen-power system is 4.9%. The system's break-even point is in the 17th year, and the green power rate of the system is 99.9%. The "power-hydrogen-power" system based on hydrogen gas turbine can solve the power balance problem of the new power system. By the established double-layer optimization model, the system configuration and operation mode are optimized, effectively improving the renewable energy consumption rate, reducing system investment and operation costs as well as carbon emissions, enhancing energy supply stability, and it is feasible and economically viable.