Abdolmajid DEJAMKHOOY, Ali DASTFAN, Alireza AHMADYFARD

Source detection and propagation of equal frequency voltage flicker in nonradial power system

Nowadays electric power quality problems such as flicker (voltage fluctuation) are major concerns of electric companies and industrial consumers. Identification of flicker sources is an important stage in the flicker reduction process. Flicker source can be modeled as a nonlinear load whose admittance is intermittent and time-variant. In the steady state, fluctuation of voltage amplitude is a function of the impedance of flicker sources. In this paper, after calculating the gradient of voltage amplitudes and constructing a Jacobian matrix, criteria for flicker source detection are proposed. Therefore, by measuring voltage and current of each load in the power system, the contaminative loads are identified. In the next step, flicker propagation throughout the power system is investigated. For identifying the dominant flicker source, an algorithm based on a directed graph method is proposed. For different operation modes of flicker sources, the effects of their locations on dominating are analytically interpreted. The proposed methods are tested in a typical nonradial power system in which several flicker sources have been operated. The flicker sources are operated with equal fluctuation frequency and different operation modes. Simulation results show a good performance for the single point proposed method in flicker source detection. These results confirm that the proposed algorithm can identify dominant flicker source as expected for our theory

PDF

___

[1] Baggini A. Handbook of Power Quality. New York, NY, USA: Wiley, 2008.
[2] Ammar M, Joos G. Impact of distributed wind generators reactive power behavior on flicker severity. IEEE T Energy Conver 2013; 28: 425433.
[3] IEC. Standard 61000-4-15. FlickermeterFunctional and Design Specifications. Geneva, Switzerland: IEC, 2003.
[4] Wiczynski G. Inaccuracy of short-term light flicker Pst indicator measuring with a flickermeter. IEEE T Power Deliver 2012; 27: 24282430.
[5] Axelberg PGV, Bollen MHJ. Trace of flicker source by using the quantity of flicker power. IEEE T Power Deliver 2008; 23: 465471.
[6] Nassif AB, Nino EE, Xu W. A V-I slope-based method for flicker source detection. In: 37th Power Symposium Annual North American; 2325 October 2005; Ames, IA, USA. New York, NY, USA: IEEE. pp. 755760.
[7] Morsi WG, El-Hawary ME. Novel power quality indices based on wavelet packet transform for non-stationary sinusoidal and non-sinusoidal disturbances. Electr Pow Syst Res 2010; 80: 753759.
[8] Hernandez A, Mayordomo JG, Asensi R, Beites LF. A method based on interharmonics for flicker propagation applied to arc furnaces. IEEE T Power Deliver 2005; 20: 23342342.
[9] Eghtedarpour N, Farjah E, Khayatian A. Intelligent identification of flicker source in distribution systems. IET Gener Transm Dis 2010; 4: 10161027.
[10] Altınta¸s E, Salor O, C¸ adırcı I, Ermi¸s M. A new flicker contribution tracing method based on individual reactive ¨ current components of multiple EAFs at PCC. IEEE T Ind Appl 2010; 46: 17461754.
[11] Mazadi M, Hosseinian SH, Rosehart W. Instantaneous voltage estimation for assessment and monitoring of flicker indices in power system. IEEE T Power Deliver 2007; 22: 18411846.
[12] Perera D, Meegahapola L, Perera S, Ciufo P. Characterization of flicker emission and propagation in distribution networks with bi-directional power flows. Renew Energ 2014; 63: 172180.
[13] Marcus IU, Nestor AE, Clarkson P. The influence of the network impedance on the nonsinusoidal (harmonic) network current and flicker measurements. IEEE T Instrum Meas 2011; 60: 22022210.
[14] Hsieh GC, Hung JC. Phase-locked loop techniques-A survey. IEEE T Ind Electron 1996; 43: 609615.
[15] Karimi-Ghartemani M, Iravani MR. Robust and frequency-adaptive measurement of peak value. IEEE T Power Deliver 2004; 19: 481489.