Evaluation of effective shading factor by fitting a clear-day pattern obtained from hourly maximum irradiance data

Uchida, Daisuke; Otani, Kenji; Kurokawa, Kosuke

doi:10.1016/s0927-0248(00)00321-4

Cited by 20 publications

(9 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this paper, a novel method developed by researchers Japanese called SV (Sophisticated Verification) method has been used to obtain performance accurate from a PV system representing different PV modules technologies. [6,7,11]…”

Section: Photovoltaic Energy Conversion Loss Model Of Pv Systems (Sopmentioning

confidence: 99%

“…When shading effects are identified, the E AM is compared to the theoretical curve E Ath that has no effect on shading. E Ath is obtained to fit as an envelope, this fitting is shown as m·E ASmax [7,11,12]. Estimation of value m is explained to find a maximum value of m by an iterative algorithm so that any extracted maximum values, E AM do not exceed an estimated curve at any points.…”

Section: Figure 5 No Mismatch Line and Other Array Factormentioning

confidence: 99%

“…In this case, the difference in the point E AM and the point E Ath above the curve E ASmax is caused by the influence of shading. If a diffused component of clear-day irradiance is assumed 20% that is on a standard fine day because E AM is close to a fine weather day, a shading factor can be calculated by equation (11). It is considered that no shading takes place for the diffused component.…”

Section: Figure 5 No Mismatch Line and Other Array Factormentioning

confidence: 99%

“…In contrast with ordinary procedure, according to SV method, shading factor K HS , load matching factor K PM , other array factor K PO can be estimated additionally. This method, consider that of the clearsky power pattern consists only of partial shading and full shading because the mismatch hardly occurs in a clear day, it is naturally omitted by the extraction of hourly maximum values [7,11].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Monitoring and Evaluation of PV Pumping System Performance Installed in The Algeria’s Sahara City of Adrar

Yaichi¹,

Mammeri²,

Fellah³

2016

ijeei

View full text Add to dashboard Cite

The Sunbelt area like Algeria, specially the Saharan medium by its arid nature and the availability of huge solar irradiance can be a good choice of the application of the photovoltaic (PV) system. Water pumping by PV system for irrigation purposes can be considered as one of the basic needs in the rural areas of Algeria. PV modules are given a power rating at standard test conditions (STC) of 1000W/m 2 , AM1.5 and a module temperature 25°C, but these conditions do not represent what is typically experienced under outdoor operation. To improve the performances of such type of systems, a study based on outdoor experimental tests is necessary, to establish how much energy is produced and the major parameters that most influence on their quality. The main objective of this paper is to review the state of the art of PV systems in the Adrar Desert of Algeria by the analysis of the operational data of the PV installation. Sophisticated Verification method so called SV method has been used to evaluate a PV pumping system performance during seven months. Differences between real and installed energy of up to 18% have been detected. It has been observed that the high output gain due to the operating condition in an extreme low module temperature. On the basis of these monitoring results, the performance of PV systems is compared to the measured performance of residential PV systems installed in other countries. The results indicated that the motor-pump efficiency changed by the pumping head.

show abstract

Section: Photovoltaic Energy Conversion Loss Model Of Pv Systems (Sopmentioning

confidence: 99%

Section: Figure 5 No Mismatch Line and Other Array Factormentioning

confidence: 99%

Section: Figure 5 No Mismatch Line and Other Array Factormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Monitoring and Evaluation of PV Pumping System Performance Installed in The Algeria’s Sahara City of Adrar

Yaichi¹,

Mammeri²,

Fellah³

2016

ijeei

View full text Add to dashboard Cite

show abstract

“…As the arrays were stationary, and assuming the shading object did not move with time, the position of the sun is the factor which determines the shading effect. In previous studies (for example Uchida et al, 2001) the shading effect was taken to be a function of the time of day and time of year. However the use of sun position removes the need to consider these additional variables and offers much greater insight into the problem.…”

Section: Shading Faultsmentioning

confidence: 99%

A simple model of PV system performance and its use in fault detection

2010

View full text Add to dashboard Cite

Results are presented from a monitoring study of the performance of a sample of UK domestic PV systems.Five minutely average climatic and performance data was recorded for 27 PV systems at two sites for up to two years of operation. On average, the annual energy losses due to faults were 3.6% (Site A, first year of operation), 6.6% (Site A, second year of operation) and 18.9% (Site B, first year of operation). Simple empirical models are constructed to describe the performance of the PV systems under 'normal operation' (when no faults occur). New analysis techniques are developed which estimate the energy losses of four different fault categories: sustained zero efficiency faults; brief zero efficiency faults; shading; and non-zero efficiency non-shading faults. The results demonstrate that faults have the potential to cause significant energy losses in domestic PV systems. The benefits of applying the data analysis techniques described in this work to PV system clusters and other urban micro-generation technologies are discussed. KeywordsPhotovoltaic; PV; monitoring; high resolution; analysis; model; fault detection; shading IntroductionOne of the main aims of research in building integrated PV systems is to improve the performance of installed PV systems. A drive for greater efficiency is necessary to increase the amount of electricity generated per Wp of installed PV capacity and so reduce the unit cost of the electricity. An essential part of such work is in understanding the energy losses which occur in installed PV systems and developing methods to minimise these energy losses. Some losses, such as the energy lost in the conversion of sunlight to electricity by the PV cell, are unavoidable and can only be significantly reduced by improvements in the technology of PV system components. Other energy losses, such as shading, are related to the installation of the PV systems and can be minimised through careful planning, design and operation. 06/05/2010-2 -Energy losses in installed PV systems can be detected by monitoring the operational performance and analysing the recorded data. Monitoring of PV systems has been used to develop guides and benchmarks for PV system performance (IEA, 2000). Demonstration PV systems (usually among the first PV systems to be installed in a country) and systems with unique characteristics (such as new cell technologies or novel construction techniques) often have their performance monitored in detail. Such monitoring studies record the performance of the PV systems, analyse the energy losses and provide recommendations to improve the design of future systems (e.g. Roaf and Fuentes, 1999). This becomes an iterative process when the next generation of PV systems incorporating the design improvements are themselves monitored and used to develop further recommendations to raise efficiency (Erge et al., 2001).PV systems are often monitored according to standards, for example the British Standard BS EN 61724 (BSI, 1998) and the recorded data analysed on an annual basis (e.g. ...

show abstract

Realistic PV Performance Values Obtained by a Number of Grid-Connected Systems in Japan

Kurokawa

2000

World Renewable Energy Congress VI

View full text Add to dashboard Cite

Evaluation of effective shading factor by fitting a clear-day pattern obtained from hourly maximum irradiance data

Cited by 20 publications

References 2 publications

Monitoring and Evaluation of PV Pumping System Performance Installed in The Algeria’s Sahara City of Adrar

Monitoring and Evaluation of PV Pumping System Performance Installed in The Algeria’s Sahara City of Adrar

A simple model of PV system performance and its use in fault detection

Realistic PV Performance Values Obtained by a Number of Grid-Connected Systems in Japan

Contact Info

Product

Resources

About