Research On The Stability Of Wind-thermal-Bundled Transmission System With Asynchronized Turbogenerator

As the "carbon was at peak,carbon neutral," mission objectives put forward,the new energy power generation technology has become a focus for the future development of power industry in our country.In the energy load of reverse distribution,ac/dc hybrid transmission system has become an important way of crossregional transmission at the same time,high permeability of new energy unit,high power electronic devices such as the new power equipment is gradually mass connected to the electricity grid to the stability of power system has brought the huge challenge.Thermal power unit in electric power system with frequency modulation,voltage regulator,and other important task,compared with the traditional Synchronous turbo Generator(Synchronous Turbine Generators,STG),asynchronous turbo Generator(Asychronized Turbine Generator,ASTG)has high degrees of freedom of excitation control,deep into the ability,superior active,reactive power regulation performance,more conducive to stable operation of power system.Aiming at different wind and fire after electricity delivery system,research ASTG access to small disturbance stability of the power system,specific as follows:Firstly,this paper ASTG working principle of the generator and the dual-channel excitation control system mathematical model is established,and is applicable to practical fourth-order model of multimachine system analysis,the simulation analysis of the steady state and transient operation characteristics.System other components model is set up,and further build the whole power system mathematical model.In simulation software to build ASTG motor model,lay a foundation for subsequent theoretical analysis,simulation experiment.Secondly,based on eigenvalue analysis method,to contain the turbine-generator unit is asynchronous Kundur single-machine infinite system,WSCC3 machine 9 nodes do small disturbance stability analysis and validation of ASTG access to improve the system damping and improve system stability.Structures containing wind and fire after power supply of the two area four machine transmission system,with characteristics of small disturbance analysis modal of the system were analyzed.Through the simulation show that the wind generator as output increases,the system running state changes,but ASTG access to increase the damping system,effectively restrain unstable oscillation of the system.Finally,the future development trend of power system in China,establishing of ASTG wind and fire after ac/dc hybrid system model to be delivered to the outside,combining with the characteristic value analysis method from the Angle of the damping small disturbance stability analysis system.By time domain simulation analysis wind permeability,ASTG in thermal power power accounted for factors such as the impact on the stability of power system,and summarizes the method can improve the stability of the system.