On the Effects of Solar Panels<?Pub _newline ?>on Distribution Transformers

Awadallah, Mohamed A.; Xu, Tao; Venkatesh, Bala; Singh, Birendra N.

doi:10.1109/tpwrd.2015.2443715

Cited by 43 publications

(24 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is noticeable especially in Medium Voltage (MV) and Low Voltage (LV) networks, which are more vulnerable to the variations of the distributed generation. Several examples of the consequences brought by the large PV penetration in the distribution systems can be found in the literature [14]- [17]: voltage variations and unbalance, power congestion at the substation feeders, reverse power flows that can trip the protection relays affecting the grid reliability and islanding protection, etc.…”

Section: Outline the Available Fit Payment Plans Ie Percentage Fitmentioning

confidence: 99%

Coordinated microgrid investment and planning process considering the system operator

et al. 2017

View full text Add to dashboard Cite

Nowadays, a significant number of distribution systems are facing problems to accommodate more photovoltaic (PV) capacity, namely due to the overvoltages during the daylight periods. This has an impact on the private investments in distributed energy resources (DER), since it occurs exactly when the PV prices are becoming attractive, and the opportunity to an energy transition based on solar technologies is being wasted. In particular, this limitation of the networks is a barrier for larger consumers, such as commercial and public buildings, aiming at investing in PV capacity and start operating as microgrids connected to the MV network. To address this challenge, this paper presents a coordinated approach to the microgrid investment and planning problem, where the system operator and the microgrid owner collaborate to improve the voltage control capabilities of the distribution network, increasing the PV potential. The results prove that this collaboration has the benefit of increasing the value of the microgrid investments while improving the quality of service of the system and it should be considered in the future regulatory framework. KeywordsDistribution grid voltage control, microgrid design, model predictive control, photovoltaics. IntroductionThe number of photovoltaic (PV) installations have exponentially increased over the last decades and a more accelerated growth, pulled by the emerging economies, is expected by In addition, in order to maximize the on-site DER penetration it is a common practice to apply Demand Response (DR) procedures to decrease the load in peak hour conditions, These technical approaches to improve grid controllability proved to be very efficient in increasing the capabilities of distribution systems to host more PV capacity. However, they entail investment and operational costs to the distribution system operators (DSO) and, especially in scenarios of unbundling electricity sectors, DSOs have no interest in making those investments and bearing those costs. In fact, they have no motivation to enable more PV capacity, since their remuneration depends on electricity consumption and the 6 challenges of solar integration are mostly peak power related [19]. Moreover, the installation of photovoltaic units has the practical effect of reducing the net consumption of the prosumers, which decreases the income of the DSOs.The difficulties of the system to accommodate more solar power persist in most distribution networks, especially those that already have a considerable number of photovoltaic installations connected to the LV network. This is a particular barrier for larger consumers, such as commercial and public buildings, aiming at investing in PV capacity and start operating as microgrids connected to the MV network (e.g., [26] and [27]). Three main reasons explain the limitations imposed by the distribution grids to the microgrids investment and planning process: 1) microgrids require a significant amount of PV to justify the investments and, since all the capacity is conc...

show abstract

Section: Outline the Available Fit Payment Plans Ie Percentage Fitmentioning

confidence: 99%

Coordinated microgrid investment and planning process considering the system operator

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The impacts of DG and more specifically PV on the aging of transformers have also been investigated in the literature [76][77][78][79][80][81][82][83][84][85][86]. The incorporation of rooftop PVs in residential networks at moderate penetration levels is starting to be a reality in many countries.…”

Section: Distributed Generationmentioning

confidence: 99%

“…Pezeshki et al, studied the impacts of rooftop PVs at different penetration levels on the performance of distribution transformers and residential networks [26,75]. Awadallah et al, presented a two-step study on the effects of harmonic distortion of solar panels on distribution transformers via simulation and experiments [83]. Jimenez et al, showed the results obtained after monitoring a distribution transformer during an 18 months period and which attained unusually low power factor levels and where the operating temperature was used as an indicator of the stress on the transformer [84].…”

Section: Distributed Generationmentioning

confidence: 99%

Effect of Loads and Other Key Factors on Oil-Transformer Ageing: Sustainability Benefits and Challenges

et al. 2015

View full text Add to dashboard Cite

Transformers are one of the more expensive pieces of equipment found in a distribution network. The transformer's role has not changed over the last decades. With simple construction and at the same time mechanically robust, they offer long term service that on average can reach half a century. Today, with the ongoing trend to supply a growing number of non-linear loads along with the notion of distributed generation (DG), a new challenge has arisen in terms of transformer sustainability, with one of the possible consequences being accelerated ageing. In this paper we carefully review the existing studies in the literature of the effect of loads and other key factors on oil-transformer ageing. The state-of-the-art is reviewed, each factor is analysed in detail, and in the end a smart transformer protection method is sought in order to monitor and protect it from upcoming challenges.

show abstract

“…These targets along with cost reduction of rooftop photovoltaic (PV) systems encourage investors to install PVs and generate energy from them, resulting in a PV uptake rate of 60% per annum [4] in recent years. Although PV systems present some advantages to consumers and providers [5], high penetration of them develops some power quality problems such as current and voltage unbalance [6][7][8][9][10][11]. One of the disadvantage of load unbalance on a distribution transformer is the reduction of its useful lifetime [7,12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Although PV systems present some advantages to consumers and providers [5], high penetration of them develops some power quality problems such as current and voltage unbalance [6][7][8][9][10][11]. One of the disadvantage of load unbalance on a distribution transformer is the reduction of its useful lifetime [7,12,13]. On the other hand, the PV generation during peak time can reduce the load [14] and, consequently, extend the lifetime of distribution transformers.…”

Section: Introductionmentioning

confidence: 99%

Distribution transformer lifetime analysis in the presence of demand response and rooftop PV integration

Behi

Arefi

Pezeshki

et al. 2017

Renew. Energy Environ. Sustain.

View full text Add to dashboard Cite

Abstract. Many distribution transformers have already exceeded half of their expected service life of 35 years in the infrastructure of Western Power, the electric distribution company supplying southwest of Western Australia, Australia. Therefore, it is anticipated that a high investment on transformer replacement happens in the near future. However, high renewable integration and demand response (DR) are promising resources to defer the investment on infrastructure upgrade and extend the lifetime of transformers. This paper investigates the impact of rooftop photovoltaic (PV) integration and customer engagement through DR on the lifetime of transformers in electric distribution networks. To this aim, first, a time series modelling of load, DR and PV is utilised for each year over a planning period. This load model is applied to a typical distribution transformer for which the hot-spot temperature rise is modelled based on the relevant standard. Using this calculation platform, the loss of life and the actual age of distribution transformer are obtained. Then, various scenarios including different levels of PV penetration and DR contribution are examined, and their impacts on the age of transformer are reported. Finally, the equivalent loss of net present value of distribution transformer is formulated and discussed. This formulation gives major benefits to the distribution network planners for analysing the contribution of PV and DR on lifetime extension of the distribution transformer. In addition, the provided model can be utilised in optimal investment analysis to find the best time for the transformer replacement and the associated cost considering PV penetration and DR. The simulation results show that integration of PV and DR within a feeder can significantly extend the lifetime of transformers.

show abstract

On the Effects of Solar Panelson Distribution Transformers

Cited by 43 publications

References 22 publications

Coordinated microgrid investment and planning process considering the system operator

Coordinated microgrid investment and planning process considering the system operator

Effect of Loads and Other Key Factors on Oil-Transformer Ageing: Sustainability Benefits and Challenges

Distribution transformer lifetime analysis in the presence of demand response and rooftop PV integration

Contact Info

Product

Resources

About