Power system flicker analysis and numeric flicker meter emulation

This paper presents a methodology for flicker propagation analysis, numeric IEC flickermeter emulation and flicker source modeling. The main results of this study are: To create a distribution load model by which the flicker propagation from HV to MV can be studied, To build numeric IEC flickermeter with improved algorithm (demodulator and nonlinear classification), To build simplified actual disturbance source models (electric arc furnace, welding machine, motor starter, etc), which can be used in frequency domain and load-flow flicker assessment. The complexity of nonlinear models for simulating the dynamic behavior of arc furnaces and welding machines is wen known. For this reason, previous works are generally based on time domain solutions. In this paper, a simplified approach has been studied by using RMS value-based modeling. The models have been validated against experimental results and site measurements. After integration of these models and a numeric flickermeter in a frequency domain software, it is possible to simulate almost all low frequency electrical disturbances with very short computing time and to survey interactions among them, for example, between voltage dip and flicker.