Stability Analysis Of Wind-thermal Bundling System With AC Power Grid Based On VSC-HVDC Transmission Technology

The characteristics of wind-grid system based on HVAC technology and HVDC technology are discussed, for the task of utilizing large-scale wind power, A wind-thermal bundling system with AC power grid based on VSC-HVDC transmission technology is designed and optimized, and the stability of simulation model is validated。The contents of each part are as follows:In chapter2, the doubly fed induction generator-DFIG is modeled in power system simulation software-DIgSILENT/PowerFactory, and the control strategies of wind turbine converters and blade control system are analysed, the wind-grid system performances of DFIG is studied。In chapter3, for the task of utilizing large-scale wind power, high capacity wind-grid systems based on HVAC technology and HVDC technology are modeled, including control strategies of the two sides converters。By comparative experims of wind-grid systems based on HVAC and HVDC transmission, the contribution of HVDC topology to improve the stability of wind farms and receiving-end AC grid are verified。In chapter4, wind power is randomness and intermittent, and AC power system has the need to meet the variability of wind farms integration。A wind-thermal bundling system with AC power grid based on VSC-HVDC transmission technology is designed, including control strategies of the two sides converters o The disturbance conditions of local load change and receiving-end AC bus fault for the bundling system are simulated, and the optimal wind-thermal bundling system with AC power grid based on VSC-HVDC transmission topology is raised。In chapter5,for the optimal wind-thermal bundling system with AC power grid based on VSC-HVDC transmission topology。 By accomodating active output of thermal power plant, coordinated with the control strategies of the VSC converters, the disturbance conditions of wind power fluctuation and receiving-end AC bus fault for the bundling system are simulated。Simulation results show that the stability of wind farms and thermal power plant are ensured, and the optimal wind-thermal-AC bundling system topology is feasible。The studied optimal wind-thermal-AC bundling system grid connected mode provides a generation model for reference for large-scale intermittent energy integration。...