电网低频减载仿真模型及参数研究

Study of Interim Models and Parameters for Under-frequency Load Shedding Simulation in Power Grid

研究了电网中主要元件模型及参数在低频减载仿真中对系统频率动态过程的影响,主要包括调速系统、励磁系统和负荷等元件。以华东某电网为例,采用时域动态仿真确定了适用于该电网低频减载优化配置的模型参数。对于未知的模型参数,通过参数灵敏度分析,得出了影响系统频率动态过程的主要参数,再通过对电网2次实际故障的仿真,拟合频率动态曲线得到了未知参数值。低频减载仿真表明,模型与参数对系统的动态频率影响较大,而模型与参数的确定依赖于系统实际故障数据的测量。

In this paper, the sensitivities of the dynamic frequency characteristic with respect to the models and parameters of all equipments are studied. The models and parameters, which are suitable for the optimal setting of UFLS scheme in a target power grid, are obtained by using Time-Domain Dynamic Simulation （TDDS） method. The main parameters are fixed by analyzing the sensitivities of the dynamic frequency curves with respect to the models. The rest parameters are obtained through the simulation studies of several real fault recorded curves in the power grid. The simulation results indicate that the performance of the TDDS method depends on the models and parameters and the identification of the models and parameters depend on the amount of the real fault data.