暂态稳定分析中低压切负荷对仿真结果的影响

负荷模型对电力系统仿真的结果有重要影响,随着系统中电压敏感负荷的增多,短暂低电压发生时负荷的切除对系统仿真结果的影响不可忽略。东北某变电站记录的大扰动实验时的实测数据表明,系统在低电压发生时存在负荷切除现象。10机39节点系统的仿真说明,切负荷现象对系统仿真结果影响巨大。在分析实测数据和原来综合负荷模型的基础上,通过增加有关低压切负荷因子,成功地模拟了电力系统在低压暂态过程中的掉负荷现象,所提出的新模型为研究电网大电压扰动下的动态稳定提供了借鉴。

The impact of load shedding characteristic on transient stability analysis

Load model has great impact on power system simulation results.With the increasing number of voltage sensitive loads in the grid,the impact of load shedding due to short time low voltage on the simulation results cannot be ignored.The analysis of field measurement data indicates that load shedding happens during system low voltage.The simulation results of a ten-machine thirty-nine node system shows the importance of load shedding characteristic during transient stability analysis.Based on the analysis of field data and traditional load model,a new load model with load shedding factor was proposed.The proposed model has the ability to describe load shedding characteristic under low voltage and provides guidance for power system dynamic analysis.