宁夏电网负荷模型对稳定性的影响分析

Analysis of load models influence on Ningxia Power Grid Stability

负荷模型是影响电网稳定分析结果的一个重要因素.对宁夏电力系统负荷特性进行研究后得到的综合负荷模型与传统负荷模型有一定区别.利用电力系统综合稳定分析程序和基于负荷特性研究获得的负荷模型分析宁夏-甘肃断面部分线路的极限切除时间及各地区不同负荷水平下的暂态电压稳定问题;并与基于传统负荷模型的宁夏电网暂态功角和暂态电压稳定计算结果进行比较,分析不同的负荷模型对电网稳定计算的影响.最后采用新负荷模型研究宁夏电网存在的静态电压稳定问题.结果表明,辨识得到的负荷模型更接近实际电网的负荷特性,可以较好反映出宁夏电网的暂态电压稳定问题.

Load model is an important factor that influences the stability analysis of power grid. The synthesis load model of Ningxia Power Grid based on the load characteristics research is different from the conventional load model. By use of the power system analysis software package （PSASP） and the load model based on the load characteristics research, the critical clearing times for some transmission lines of the tie-line connecting Ningxia Power Grid with Gansu Power Grid as well as the transient voltage stability of different regions in Ningxia Power Grid under different load levels were analyzed in this paper. The obtained results were compared with those based on conventional load model, and demonstrated that the simulation results of different models were distinguished from each other clearly. Moreover, the static voltage stability of Ningxia Power Grid was analyzed with the new load model. Comparison results showed that the new model was closer to the actual load characteristics of the Ningxia Power Grid and can better reflect the Ningxia Power Grid transient voltage