A method for determining the transient stability of wind power connected to multi station power systems based on short-circuit comparison was proposed.Firstly,an equivalent model was established for the new energy grid connected system,and the Thevenin equivalent parameter method was used for time-domain simulation to solve the transient Thevenin equivalent parameters of the system;on this basis,the short-circuit capacity of the AC system was calculated,the short-circuit ratio of the new energy grid connected system was derived,and an algebraic relationship between the short-circuit ratio and node voltage was constructed so as to obtain the calculation formula of the system short-circuit ratio regarding node voltage;finally,the critical short circuit ratio was gained based on the maximum transmission power of the system,and the real-time evaluation of system transient stability was achieved through comparison.The simulation results show that the Thevenin short-circuit ratio calculation based on time-domain simulation is accurate and the algorithm has strong adaptability.When the short-circuit ratio is less than the critical short-circuit ratio,the system is in the characteristic unstable region,while it is in the stable region on the contrary.
关键词
戴维南等值/新能源并网/暂态稳定/短路比/临界短路比
Key words
Thevenin equivalent/renewable energy grid connection/transient stability/short circuit ratio/critical short circuit ratio
维普
万方数据