基于实测轨迹校正模型参数对电力系统频率动态过程仿真精度的影响

摘要

研究电力系统频率动态过程的重要手段是基于数值仿真的方法，但多次事故后仿真复现表明，采用现有的模型及参数无法准确描述实际电力系统的频率动态过程，仿真结果与实测轨迹之间存在明显偏差。文章首先基于 WSCC 系统，分析不同参数对频率动态过程的影响趋势，并基于东北电网网架结构和实测数据，在复杂多机系统中验证从 WSCC 系统得出的不同参数物理特性结论。基于实测轨迹并参考参数的物理特性结论校核频率动态过程仿真模型和参数，提高频率动态过程的仿真精度，对于整定低频减载方案，克服以往保守的运行方式等方面提供有效依据。%Although numerical simulation is an important method in researching dynamic frequency process,obvious deviations between the numerical simulation and the measured trajectory have been found based on the simulation re-production in many accidents. And the existing simulation model and parameters cannot describe the actual dynamic process of frequency accurately. Researches are carried out on the influence of four parameters to the dynamic fre-quency process,which are based on the WSCC system. The four parameters include the inertia constant of generator, generator frequency coefficient,dead band and turbine intermediate superheating coefficient. Northeast China power grid and measured data are adopted to verify the above research conclusion. Checking the dynamic frequency process simulation model and parameters will improve the accuracy of dynamic frequency process simulation on the basis of the measured trajectory and the physical characteristics of the parameters. It can also give efficient foundation for the set-ting work of UFLS to overcome the previous conservative operation mode.