Czasopismo | PRZEGLĄD ELEKTROTECHNICZNY | Rocznik 2016 - zeszyt 7

Mitigation of Steel Making Plants’ Electrical Power Quality Problems Using SVC – A Case Study

10.15199/48.2016.07.27

nr katalogowy: 99574
10.15199/48.2016.07.27

The first part in this paper presents the steps of the design for required Static Var Compensator (SVC) system to eliminate power quality problems. The second part will discuss the dynamic model in the form of differential equation used for the EAF. The EAF model is then integrated with the SVC model to demonstrate network dynamic interactions during different operating conditions. Finally, comparison between design and actual power quality performance figures measured for actual steel making plant substation are shown at the end to validate the design values. Streszczenie. W artykule opisano projekt układu kompensacji mocy biernej w przedsiębiorstwie hutniczym a następnie analizowano właściwości dynamiczne systemu. Porównano dotychczas istniejący system i nowy system z kompensacja mocy biernej. Problem poprawy jakości energii elektrycznej w przedsiębiorstwie hutniczym - analiza przypadku. Keywords: Power Quality, SVC, EAF, Harmonics. Słowa kluczowe: jakość energii elektrycznej, przedsiębiorstwo hutnicze. Introduction The main power supply voltage of network under-study is 220 kV at point of common coupling (PCC) "220/66 kV substation. The steel making substation is supplying all plants with necessary electric energy on 33 kV, 6.6 kV and 400 V levels, the most significant loads are the EAF’s and Ladle Furnaces (LF’s) which represent 50% of total plants consumption. CASE STUDY OVERVIEW Power Network Topology and System Overview The network with PCC and the single line diagram of electric arc furnaces and ladle furnaces inside the Steel Making Plant (SMP) are as described in table 1 and Fig. 1 respectively: Table 1 Network Data PCC (kV) 220/66 Substation incoming feeders installed capacity (MVA) 3x380 Steel Making plant Power Transformers kV 220/33 Steel Making plant Power Transformers MVA 2x125/150 (ONAN/ONAF) Steel Making plant Power Transformers Z% EAF MVA 21 % 4 X 58 MVA EAF Rated PF EAF Transformer Imp[...]

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