Reactive power compensation in a steel industrial plant with several operating electric arc furnaces utilizing open-loop controlled TCR/FC compensators

Abstract

Electric arc furnaces (EAFs) produce voltage fluctuations and flicker because of the reactive power severe variations. Furthermore, these loads absorb a large amount of reactive power. The static VAr compensators (SVCs) have been widely used by the industrial customers with arc furnaces to compensate the reactive power due to the quick response of the power electronic devices. In this paper, reactive power compensation in the steel industrial plant with several EAFs by utilizing open-loop controlled thyristor controlled reactor/fixed capacitor (TCR/FC) compensator is performed. The TCR/ FC compensator is usually applied in conventional steel making plants; one is in Mobarakeh/ Isfahan, Iran which is considered as the case study in this paper. Simulation results show that, although open-loop controlled TCR/FC is effective for compensating reactive power, it cannot efficiently compensate the fluctuations of the reactive power and reduce the flicker intensity. Figure 10. RMS voltages at PCC from t ¼ 0.2 second to t ¼ 0.28 second.

A New Dynamic Intelligent Time Domain Arc Furnace Modeling based on Combination Adaptive Neuro-fuzzy Inference System and Chain Code

“…3. Compared with the non-linear arc models [11][12][13], the proposed model exhibits faster performance speed, since other models are either based on complex equations requiring accurate initial conditions or can only be used for a unique EAF. Also, some may be linear while others might be non-linear equations.…”

“…These loads can generate different types of disturbances and distortions such as voltage flicker, current and voltage harmonics, inter-harmonics, unbalances, sags, and swells in power systems, known as power quality (PQ) parameters. An electric arc is an electric discharge used in steel producing industries to melt scraps, direct-reduced iron (DRI), and other raw materials, along with lime and fluxes, by means of both So far, several models, such as a voltage-source model [1][2][3][4][5][6], data-based models [7], harmonic frequency models [8][9][10], and non-linear and data recording models have been presented for EAF [11][12][13].…”

“…This model is valid for unique EAF and cannot show all the melting stages. The coefficient changes for EAF modeling based on V-I characteristic are presented in [10,12,13]. In [14], an arc model based on the hidden Markov model (HMM) is presented.…”

Implementation aspects and comprehensive assessment of a 16 MVAr static VAr compensator installed for a weak distribution network

“…One of the most serious problems in such distribution grids is the voltage instability. The analysis and types of solutions for it are well defined in the literature . On the other hand, the optimum placement of an SVC to support the voltage profile among a grid is an important subject and different approaches exist .…”

“…The analysis and types of solutions for it are well defined in the literature. [27][28][29][30][31][32][33][34][35][36] On the other hand, the optimum placement of an SVC to support the voltage profile among a grid is an important subject and different approaches exist. [36][37][38][39][40][41][42] However, for the SVC system described in this paper, there was no practical alternative for the placement due to geographical, economical, and logistical reasons.…”