Harmonic Contribution Detection of Iron and Steel Plants Based on Correlation of Time-Synchronized Current and Voltage Signals

In this paper, the problem of detecting the harmonic responsibility of iron and steel (I&S) plants, which are supplied from a point of common coupling (PCC) is addressed. A new harmonic responsibility measure, which does not require the instantaneous impedance measurements, is proposed to present the amount of harmonic responsibility of each plant supplied from the PCC. The algorithm is based primarily on the correlation of voltage and current signals which are measured with a time-synchronized manner at the PCC. The proposed method is first verified using both synthetic data generated in PSCAD/EMTDC simulation environment and the field data. Then measurements of voltage and current waveforms via mobile Power Quality (PQ) measurement systems from one of the PCCs of the electricity transmission system are used for the verification of the proposed algorithm. The results of the method have been compared with those of the existing methods in the literature and it has been shown that the harmonic responsibility of each I&S plant can be determined successfully for each harmonic order. The advantage of the proposed method is that there is no more need for online system impedance measurements or in-plant measurements. The algorithm can be applied to power quality monitoring systems, active power filters, synchronous static compensators (STATCOMs) and other compensation systems to reduce and control the distortion effect of current harmonics and also interharmonics, if required, which are casued by I&S plants supplied from the PCCs of the electricty transmission system.