Geomagnetic Induced Current Measurement in Hybrid PV-Wind System Transformers
Z M Khurshid1, N F Ab Aziz2, M Z A Ab Kadir3, Z A Rhazali4
1Z M Khurshid, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang, Selangor, Malaysia.
2N F Ab Aziz, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang, Selangor, Malaysia.
3M Z A Ab Kadir, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang, Selangor, Malaysia.
4Z A Rhazali, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang, Selangor, Malaysia.
Manuscript received on November 20, 2019. | Revised Manuscript received on November 28, 2019. | Manuscript published on 30 November, 2019. | PP: 6402-6408 | Volume-8 Issue-4, November 2019. | Retrieval Number: D5148118419/2019©BEIESP | DOI: 10.35940/ijrte.D5148.118419
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Geo magnetically induced currents (GICs) can cause saturation of the magnetic core of transformers in a power system. This saturation can conduce to generating harmonic currents, voltage-control problems and overheating of the transformer internal components, leading to gas relay alarm/operation and possible damage. In this work, GICs effects have been analyzed on hybrid PV-wind system transformers. The system implemented through using Power System Computer Aided Design (PSCAD/EMTDC) platform and made up of 2.1 MW wind farm, 2 MW solar photovoltaic (PV) farm, power storage system and load. Then the system is integrated with 33 kV grids through a 480V AC bus and step-up wye/delta transformer. In addition, Pi-section has been used between different parts of the system. The GIC is modeled as a controlled DC voltage source and inserted into the system through a neutral point of a wind turbine (WT) transformer. The simulation results of reactive power, voltage and current waveforms, and non-linear behavior due to asymmetric saturation of the magnetic core in the transformer due to 100 A GIC current injections are obtained. Moreover, different GIC blocking devices have been applied to mitigate or eliminate the flow of GIC to the system.
Keywords: Geo Magnetically Induced Currents, Hybrid, PV and Wind Turbine.
Scope of the Article: Geotechnical Engineering.