一种适用于大区互联电网的负荷模型参数拟合方法

Parameters Fitting of Load Model for Wide-Area Interconnected Power Grid

电力负荷模型是电力系统分析计算的基础,模型参数的准确性关系到电力系统的安全稳定分析结果的可靠性。基于现代大区互联电网规模过于庞大、传统建模方法用于实际工作时仍存在很多问题,提出了一种针对大区互联电网的负荷模型参数的拟合方法。统计大电网内的负荷特性,根据以往的工程经验或负荷手册的推荐参数初步估计其负荷参数。将大电网按照管理和结构特征,划分为若干较小区域,调节每个小区域中负荷模型的某些重点参数并进行仿真计算,得到重点参数对全网仿真结论影响的灵敏度。根据实际电网的录波场景,分区调节负荷的重点参数,使得最终的仿真拟合效果满足一定的精度要求,得到适用的负荷模型参数。采用实际的电网扰动场景验证了该方法的正确性与实用性。

Power load model is the basis of power system analysis and calculation,and the accuracy of model parameters is related to the reliability of power system security and stability analysis results.Because the scale of the modern large interconnected power grid is too large,there are still many problems in the existing traditional modeling method in practice.To this end,this paper proposes a fitting method of load model parameters for large interconnected power network.Based on the statistics of the load characteristics of the large power grid,according to the previous engineering experience or the recommended parameters of the load manual,the load parameters are estimated.The large grid is divided into certain small areas according its management and structure features,and then some key parameters of the load model in each small area are adjusted,simulated and calculated to obtain the the sensitivity of the parameters affecting the simulation conclusion of the entire grid.According to the recorded scene of the power grid,the key load parameters are adjusted so that the final simulation results meet the requirements of a certain precision,and the suitable load model parameters are obtained.The correctness and practicability of the proposed method is verified by the actual power grid disturbance scenarios.