Research of evaluation method of auxiliary frequency modulation in gas turbine unit

Abstract

In this paper, according to the mechanical structure of the gas turbine set and the process of primary frequency modulation, the models including the speed regulating system, combustion chamber, temperature control system, torque control system, acceleration control system and synchronous generator are established. Bidirectional DC/DC converter and inverter model are established according to the circuit structure and corresponding control strategy. According to the primary frequency modulation process of the gas turbine, the control strategy of the energy storage system participating in the primary frequency modulation is set. The energy storage system uses the traditional droop control strategy and combines the primary frequency modulation process of gas turbine to improve the frequency modulation performance of gas turbine and offshore platform microgrid. Finally, PSCAD transient simulation software is used to build offshore platform and a multi-platform interconnection micro-grid model, results of the simulation show high performance of the designed microgrid.