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access icon free Improvement of reactive power calculation in electric arc furnaces utilising Kalman filter

© The Institution of Engineering and Technology
Received 04/03/2016, Accepted 04/11/2016, Revised 08/09/2016, Published 18/11/2016

Electric arc furnace (EAF) is one of the largest non-linear loads in power systems. It is highly time-varying which leads to low-frequency voltage fluctuations in the system, called flicker. Static VAr compensator (SVC) is always used in EAF plants to compensate the reactive power and reduce voltage fluctuations. The reactive power calculation unit is one of the most important units in SVC control system. Since SVC can only compensate the fundamental component, the calculated reactive power should not be sensitive to other harmonics. On the other hand, since the reactive power changes every half cycle, its calculation should be fast enough to track the changes. Hence, a calculation method with minimum delay and lowest harmonic sensitivity should be utilised to achieve an effective compensation. Among different already proposed methods for calculation of reactive power, differential method has the lowest delay. However, it is very sensitive to harmonics. In this study, Kalman filter is used to extract the fundamental components of voltage and current with a little delay and then they are used as inputs for the differential method. The proposed method is evaluated using some simulation signals and practical records from several EAFs in Mobarekeh steel company in Esfahan – Iran.

Inspec keywords: arc furnaces; power harmonic filters; reactive power; power supply quality; static VAr compensators; Kalman filters

Other keywords: flicker; low-frequency voltage fluctuations; harmonic sensitivity; static VAr compensator; reactive power calculation; electric arc furnaces; Kalman filter; differential method

Subjects: Power supply quality and harmonics; Process heating; Power convertors and power supplies to apparatus; Power system management, operation and economics

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