类噪声辨识负荷参数的实际电网校验方法

Practical Power Grid Based Validation of Load Model Parameters Identified With Ambient Signal

负荷建模是电力系统仿真和分析的关键环节,为建立更加准确的负荷模型,国内外研究学者在负荷模型结构选择及模型参数获取两个方面做了大量的研究工作。而针对负荷模型参数校验的研究相对较少。考虑到负荷建模的目的是为系统仿真提供更为准确的负荷模型,从系统仿真角度对类噪声辨识所得负荷模型参数进行验证。同时,解决了由实测数据辨识参数转换为适用于系统仿真的模型参数的工程问题。首先,根据实测同步相量测量单元(phasor measurement unit,PMU)量测所得类噪声数据辨识得到负荷模型参数,在此基础上,将辨识所得负荷模型参数转换为适用于仿真系统的格式,并替换仿真系统中现有负荷模型参数,进而对比故障时刻采用不同负荷模型参数所得仿真结果来实现负荷模型参数的有效性校验。

Load modeling plays an important role in power system simulation and analysis. In order to build more exact load models, attentions were paid to selection of load model structure and acquisition of load model parameters in previous researches. However, validation analysis for identified load model parameters was seldom conducted. Considering the purposes of load modeling, a validation method for the parameters identified with ambient signal with system simulation is proposed in this paper. Meanwhile, the engineering problem of converting the parameters identified with actual measurements into the parameters suitable for simulation is solved. Firstly, the load model parameters are identified with the ambient signal from phasor measurement unit(PMU). Then the identified parameters are used to replace the parameters in the simulation system after conversion. Finally, the simulation results with different load model parameters are compared to achieve validation purposes.