基于轨迹灵敏度频域特征提取的电力系统仿真误差主导参数识别

Dominant parameter identification of power system simulation error based on frequency domain characteristic extraction of trajectory sensitivity

电力系统动态仿真中主导参数的准确识别是进行仿真验证的前提,传统方法通过比较各参数的轨迹灵敏度时域特征大小确定主导参数。对此,提出了一种基于轨迹灵敏度频域特征提取的电力系统仿真误差主导参数识别方法。通过分析仿真误差曲线的频域特征,提取误差敏感频点;建立评估参数对轨迹灵敏度频域影响的特征指标,通过指标分析各参数轨迹灵敏度在敏感频点处的频域特性,进而得到仿真误差的主导参数集。采用WSCC 3机9节点系统验证了所提方法的有效性,结果表明所提方法弥补了从时域角度提取轨迹灵敏度信息不充分的不足,可为电力系统仿真验证提供理论支持。

Accurate identification of dominant parameters in the dynamic simulation of power systems is the prerequisite for simulation validation.Traditionally,the comparison of time domain characteristics of trajectory sensitivity for parameters is used to confirm dominant parameters.So a method for dominant parameter identification of power system simulation errors based on frequency domain characteristic extraction of trajectory sensitivity is proposed.The sensitive frequency points are extracted by analyzing frequency domain characteristics of curves for simulation errors.The characteristic indicators to depict the influence of evaluation parameters on the frequency domain of trajectory sensitivity are established,and the indicators are used to analyze the frequency domain characteristics of trajectory sensitivity for parameters at sensitive frequency points.Then,the dominant parameter sets of simulation errors are acquired.The effectiveness of the proposed method is validated with a WSCC 3-machine 9-bus system.The results show that the proposed method makes up the deficiency of insufficient utilization of trajectory sensitivity information from aspect of time domain,and can provide theoretical support for simulation validation in power systems.