电压闪变仪检测精度的研究

在研制基于IEC闪变测量原理的数字式闪变仪过程中,采用Matlab/SIMULINK搭建模拟闪变仪模型,通过离散化实现了数字式闪变仪系统。影响检测精度的因素包括:视感度滤波器的逼近;信号采样率Fs;A/D转化时的量化位数;数据量的影响;用CPF曲线求取Pst时的分级级数。在Matlab和VC环境下,分别搭建了原始参数和修正参数的仿真模型,编制了可计算短时闪变值的统计程序。仿真结果表明,参数的修正对闪变仪性能的改善有着良好的效果。最后通过物理试验验证了修正效果。

Study on Detection Precision Problem for Voltage Flicker Instrument

In developing the digital type flicker instrument based on principle of IEC flicker measurement, the digital type flicker instrument system was realized through discretization to adopt Matlab/SIMULINK to build flicker instrument model. The factors that affect detection precision include: visual acuity filter; signal sampling rate Fs; the quantification number in the transformation of A/D; the influence of data bulk; the grade series when Pst is taken using CPF curve. Under the environment of Matlab and VC, the simulation models of original parameter and correction parameter were established respectively, the statistical program was made for calculation of short time flicker value. Simulation results show that the correction of parameter has good effect for the performance improvement of flicker instrument. The good correction effect is verified finally through physical experiment.