SIMULATION AND TESTING OF THE DYNAMIC BEHAVIOR OF A 40 MW AERODERIVATIVE GAS TURBINE GENSET IN ISLANDING SITUATION

摘要

The main constraint to overcome for an islanding scheme is the transition from the interconnected to islanded mode following large disturbances. In that frame, the aeroderivative nature of the gas turbines on which recent cogeneration plants are based, on account of their reduced inertia, further increases the need for robust and optimised speed controller. Site tests remains most of the time a necessary step to bring a final confirmation of the simulation results related to partial load drop and high sudden restart load accept capabilities. The advances made in computing power and in algorithms have made possible the "high fidelity" simulation of industrial power systems, all benefit to the operational security of the electricity and steam systems. Indeed, such simulations afford significant progress in design of protective devices and automatic switching and control systems, dramatically improving the capacity of the industrial networks to withstand large disturbances, including in situations where the industrial site has to pursue operation isolated from the outside grid with the gensets taking control of the frequency and voltage. The modelling work nevertheless requires high skills and sustained effort for keeping the models updated. Major returns of this effort are certainly a deeper knowledge of system behaviour allowing the enhancement of system reliability and an adequate equipment sizing to match the required performance at the best market price.