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Analyzing Harmonic Current Effect on Distributed Photovoltaic Power Generation System Transformers | IEEE Conference Publication | IEEE Xplore

Analyzing Harmonic Current Effect on Distributed Photovoltaic Power Generation System Transformers


Abstract:

Untimely failures of Distributed Photovoltaic Power Generation System (D2PGS) Transformers has been reported by various utility owners in spite of designing in accordance...Show More

Abstract:

Untimely failures of Distributed Photovoltaic Power Generation System (D2PGS) Transformers has been reported by various utility owners in spite of designing in accordance to the technical criteria and practices of the existing technical standards during the design phase and manufactured units passing the Factory Acceptance Tests (FATs) to corroborate the newly manufactured and packaged D2PGS transformers meet their intended purpose. These accentuate the need to perform comprehensive studies in relation to analyzing the effects of harmonic currents in D2PGS transformers, specifically on the winding Eddy losses and structural stray losses. The aforementioned is crucial in examining the capability of these transformers under the operational requirements of D2PGS. This work investigates the capability of an oil-filled D2PGS transformer in a harmonically contaminated Point of Common Coupling (PCC) of a grid-connected D2PGS. To accomplish this objective, the harmonic loss factor to account for additional winding Eddy losses of the transformer while in service owing to harmonic currents is evaluated. In addition, the effect of the skin effect on the winding conductors under harmonic conditions is considered. Finally, an improved harmonic loss Factor for winding Eddy losses is proposed. The investigated case scenario and results are then used to examine the capability of the transformer when supplying distorted load current for the purpose of existing and planned D2PGS development.
Date of Conference: 23-27 August 2021
Date Added to IEEE Xplore: 28 September 2021
ISBN Information:
Conference Location: Nairobi, Kenya

I. Introduction

The national electric grid of South Africa has gone through significant adjustments over the past decade. The government has undertaken the allegiance to invest in alternative solutions to conventional coal energy production technology by exploring renewable energy sources in particular solar, wind and hydro. In point of fact, the unyielding commitment to alleviate the release of greenhouse gases, has led to an enormous growth of D2PGS in South Africa. As a result of their excellent location for this application, the provinces leading in the photovoltaic power generation include Northern Cape, Western Cape and Free State [1]. The present photovoltaic power generation capacity in South Africa is about 1,274MW [2]. Furthermore, determinations have been indicated by the Integrated Resource Plan (IRP) on solar PV energy that expects a generation capacity of 8,500MW by 2030 [3].

References

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