Validation of Solar Inverter Testing Procedure for Stand-Alone PV Systems

2019 ◽

Vol 8 (11S) ◽

pp. 798-803

Keyword(s):

Maximum Power Point Tracking ◽

Maximum Power ◽

Maximum Power Point ◽

Multilevel Inverters ◽

Pv Systems ◽

Point Tracking ◽

Pv Inverter ◽

Power Point Tracking ◽

Solar Inverter ◽

Power Point

The prospective paper presents a measured cascaded H-bridge multilevel photovoltaic (PV) inverter pro single-or three-stage grid allied applications. Secluded cascaded multilevel n/w improves effectiveness & adaptability of PV systems. toward acknowledge better use of PV modules & boost solar energy extraction, an appropriated maximum power point tracking organize plot endure connected toward both single-and three-stage multilevel inverters, whichever permits free organize of every dc-link voltage. Pro three-stage grid-associated applications, PV confounds might present unequal provided power, prompting uneven grid current. Toward comprehend this issue, a organize conspire amid modulation compensation endure likewise proposed. A test three-stage seven-level cascaded Hbridge inverter has been fabricated using nine H-bridge modules (3 modules pro exclusive stage). Every H- bridge module endures allied amid a 185-W solar panel. Simulations results obtain exhibited toward confirm practicality of prospective methodology

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Solar Inverter for Grid-Connected PV-Systems

Tenth E.C. Photovoltaic Solar Energy Conference ◽

10.1007/978-94-011-3622-8_263 ◽

1991 ◽

pp. 1027-1028

Author(s):

Valentin Crastan

Keyword(s):

Pv Systems ◽

Solar Inverter

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Influence of General and Crystallized Intelligence on Vocabulary Test Performance

European Journal of Psychological Assessment ◽

10.1027//1015-5759.18.1.78 ◽

2002 ◽

Vol 18 (1) ◽

pp. 78-84 ◽

Cited By ~ 10

Author(s):

Eva Ullstadius ◽

Jan-Eric Gustafsson ◽

Berit Carlstedt

Keyword(s):

Hierarchical Model ◽

Test Performance ◽

Verbal Ability ◽

Testing Procedure ◽

Intellectual Ability ◽

Analysis Of Covariance ◽

Categorical Variables ◽

Vocabulary Test ◽

Crystallized Intelligence ◽

General Ability

Summary: Vocabulary tests, part of most test batteries of general intellectual ability, measure both verbal and general ability. Newly developed techniques for confirmatory factor analysis of dichotomous variables make it possible to analyze the influence of different abilities on the performance on each item. In the testing procedure of the Computerized Swedish Enlistment test battery, eight different subtests of a new vocabulary test were given randomly to subsamples of a representative sample of 18-year-old male conscripts (N = 9001). Three central dimensions of a hierarchical model of intellectual abilities, general (G), verbal (Gc'), and spatial ability (Gv') were estimated under different assumptions of the nature of the data. In addition to an ordinary analysis of covariance matrices, assuming linearity of relations, the item variables were treated as categorical variables in the Mplus program. All eight subtests fit the hierarchical model, and the items were found to load about equally on G and Gc'. The results also indicate that if nonlinearity is not taken into account, the G loadings for the easy items are underestimated. These items, moreover, appear to be better measures of G than the difficult ones. The practical utility of the outcome for item selection and the theoretical implications for the question of the origin of verbal ability are discussed.

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Improvement in the Fock test for determining the reactivity of dissolving pulp

TAPPI Journal ◽

10.32964/tj12.11.21 ◽

2013 ◽

Vol 12 (11) ◽

pp. 21-26 ◽

Cited By ~ 39

Author(s):

CHAO TIAN ◽

LINQIANG ZHENG ◽

QINGXIAN MIAO ◽

CHRIS NASH ◽

CHUNYU CAO ◽

...

Keyword(s):

Moisture Content ◽

Sodium Hydroxide ◽

Constant Temperature ◽

Carbon Disulfide ◽

Testing Procedure ◽

Dissolving Pulp ◽

Water Bath ◽

Testing Conditions ◽

Pulp Sample ◽

Fock Reactivity

The Fock test is widely used for assessing the reactivity of dissolving pulp. The objective of this study was to modify the method to improve the repeatability of the test. Various parameters that affect the repeatability of the Fock test were investigated. The results showed that Fock reactivity is dependent on testing conditions affecting the xanthation between cellulose and carbon disulfide, such as the moisture content of the pulp sample, sodium hydroxide (NaOH) concentration, xanthation temperature, carbon disulfide dosage, and xanthation time. The repeatability of the test was significantly improved using the following modified testing procedure: air dried sample in the constant temperature/humidity room, xanthation temperature of 66°F (19°C) in a water bath, xanthation time of 3 h, NaOH concentration of 9% (w/w), and 1.3 mL carbon disulfide.

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A tes

Indonesian Journal of Energy ◽

10.33116/ije.v1i3.27 ◽

2018 ◽

Vol 1 (3) ◽

Author(s):

IJE Manager

Keyword(s):

Energy Supply ◽

Fossil Fuels ◽

Geographical Location ◽

Weather Conditions ◽

Past Century ◽

Solar Pv ◽

Pv Systems ◽

Trade Offs ◽

A Site ◽

Selection Methodology

In the past century, fossil fuels have dominated energy supply in Indonesia. However, concerns over emissions are likely to change the future energy supply. As people become more conscious of environmental issues, alternatives for energy are sought to reduce the environmental impacts. These include renewable energy (RE) sources such as solar photovoltaic (PV) systems. However, most RE sources like solar PV are not available continuously since they depend on weather conditions, in addition to geographical location. Bali has a stable and long sunny day with 12 hours of daylight throughout the year and an average insolation of 5.3 kWh/m2 per day. This study looks at the potential for on-grid solar PV to decarbonize energy in Bali. A site selection methodology using GIS is applied to measure solar PV potential. Firstly, the study investigates the boundaries related to environmental acceptability and economic objectives for land use in Bali. Secondly, the potential of solar energy is estimated by defining the suitable areas, given the technical assumptions of solar PV. Finally, the study extends the analysis to calculate the reduction in emissions when the calculated potential is installed. Some technical factors, such as tilting solar, and intermittency throughout the day, are outside the scope of this study. Based on this model, Bali has an annual electricity potential for 32-53 TWh from solar PV using amorphous thin-film silicon as the cheapest option. This potential amount to three times the electricity supply for the island in 2024 which is estimated at 10 TWh. Bali has an excessive potential to support its own electricity demand with renewables, however, some limitations exist with some trade-offs to realize the idea. These results aim to build a developmental vision of solar PV systems in Bali based on available land and the region’s irradiation.

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