Impact of Solar Intensity on PV Generated Current Harmonics and Transformer Life: A Mathematical Model with Experimental Validation

IF 2.1 4区工程技术 Q3 ENERGY & FUELS

Journal of Solar Energy Engineering-transactions of The Asme Pub Date : 2022-07-26 DOI:10.1115/1.4055101

S. K. Rajput, D. K. Dheer

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引用次数: 2

Abstract

With the rising penetration of photovoltaic (PV) plants on low voltage distribution systems, the generation of current harmonics as well as its impact on transformer operation is a current concern. The present research work develops a mathematical relationship of solar intensity (I(t)) with PV-inverter generated total harmonic distortion of current (THDi,inv.), and then uses IEEE recommendations to present the impact of THDi,inv on the life of a three-phase distribution transformer (TPDT). The validation of the presented model is done by real-time data monitoring from a 100 kWp solar rooftop photovoltaic (SRTPV) system, integrated with an 11 kV grid supply through a 63 kVA TPDT in the composite environment of north India. According to the results, decreasing I(t) values from 857 W/m2 to 35 W/m2 raises THDi,inv from 3.57% to 63.43%. It is also observed that the production of poor THDi,inv is high in winter season (daily average = 27.44%) in comparison to their values in summer season (daily average = 15.21%). For I(t) values less than 315 W/m2, the generation of large THDi,inv (above 15%) take place and it increases the loss of life (LoL) of TPDT by a factor of 6.0.

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太阳能强度对光伏发电电流谐波和变压器寿命的影响：一个具有实验验证的数学模型

随着光伏发电厂在低压配电系统中的普及，电流谐波的产生及其对变压器运行的影响是当前关注的问题。本研究工作建立了太阳能强度（I（t））与光伏逆变器产生的电流总谐波失真（THDi，inv）的数学关系，然后使用IEEE的建议来呈现THDi，inv对三相配电变压器（TPDT）寿命的影响。所提出的模型的验证是通过对100kWp太阳能屋顶光伏（SRTPV）系统的实时数据监测来完成的，该系统通过印度北部的复合环境中的63kVA TPDT与11kV电网电源集成。根据结果，将I（t）值从857W/m2降低到35W/m2将THDi，inv从3.57%提高到63.43%。还观察到，与夏季（日均=15.21%）相比，不良THDi、inv的产生在冬季（日均=27.44%）较高，inv（15%以上）发生，并使TPDT的生命损失（LoL）增加6.0倍。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Solar Energy Engineering-transactions of The Asme 工程技术-工程：机械

CiteScore

5.00

自引率

26.10%

发文量

审稿时长

6.0 months

期刊介绍： The Journal of Solar Energy Engineering - Including Wind Energy and Building Energy Conservation - publishes research papers that contain original work of permanent interest in all areas of solar energy and energy conservation, as well as discussions of policy and regulatory issues that affect renewable energy technologies and their implementation. Papers that do not include original work, but nonetheless present quality analysis or incremental improvements to past work may be published as Technical Briefs. Review papers are accepted but should be discussed with the Editor prior to submission. The Journal also publishes a section called Solar Scenery that features photographs or graphical displays of significant new installations or research facilities.