scholarly journals Investigation on Potential-Induced Degradation in a 50 MWp Crystalline Silicon Photovoltaic Power Plant

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Jingsheng Huang ◽  
Hongtao Li ◽  
Yaojie Sun ◽  
He Wang ◽  
Hong Yang
Keyword(s):  
Power Plant ◽  
Crystalline Silicon ◽  
Standard Test ◽  
Photovoltaic Power ◽  
Positive Voltage ◽  
Degradation Pattern ◽  
Performance Deterioration ◽  
One Year ◽  
P Type ◽  
First Time

The regular performance deterioration of P-type crystalline silicon solar modules and module strings caused by potential-induced degradation in a photovoltaic power plant was found in the field. The PID-affected solar modules dismounted from the photovoltaic power plant were further investigated systematically in the laboratory. For the first time, we found that the neutral point of voltage in a module string moved forward to the positive pole for a PID-affected module string as time goes on. Even if low positive voltage is applied to a PID-prone module, it could cause PID. The thermographic and electroluminescence (EL) images of a PID-affected module string also exhibit a regular degradation pattern. This is in good agreement with the measured power loss of the dismounted solar modules under standard test conditions. The results obtained in this paper show that the maximum power degradation rate of solar modules was as high as 53.26% after only one year of operation because of PID in the field. Due to the vast amount of solar modules and incomplete recovery, this is a terrible catastrophe for the owner of a power plant and module producer.

Hot-point probe measurements of N-type and P-type ZnO films

2017 ◽  
Vol 34 (1) ◽  
pp. 30-34 ◽  
Author(s):  
Benedict Wen-Cheun Au ◽  
Kah-Yoong Chan ◽  
Yew-Keong Sin ◽  
Zi-Neng Ng
Keyword(s):  
Low Cost ◽  
Zno Films ◽  
Content Type ◽  
Conductivity Type ◽  
Current Voltage ◽  
Positive Voltage ◽  
Soldering Iron ◽  
P Type ◽  
First Time ◽  
Probe Measurements

Purpose This paper aims to develop a low-cost hot-point which can facilitate the conductivity type of N-type and P-type zinc oxide (ZnO) films. In this study, a diode was made out of the N-type and P-type ZnO films, and current-voltage (I-V) characteristic measurements were conducted. Design/methodology/approach A low-cost hot-point probe consists of a soldering iron station, digital multimeter and a pair of probes. The setup is adopted to identify N-type and P-type ZnO films. In particular, P-type films have been deployed for the first time. Findings Hot-point probe setup has been successfully developed. Measurements of N-type films give a positive voltage reading, whereas P-type films give a negative voltage reading. The measured voltage dominates at 1 per cent for N-type Ga and at 15 per cent for P-type Na. I-V characteristics of the fabricated diode showed a similar trend to the conventional diode. Research limitations/implications N-type has been often attempted. However, P-type has rarely been attempted because of the self-compensation effect in ZnO. There is a need to verify the conductivity type of ZnO films, especially P-type, as P-type films are not stable. The hot-point probe setup serves as a quick means to verify P-type ZnO films. Originality/value To the best of the authors’ understanding, this verification tool was developed and deployed to verify the N-type and P-type ZnO films. The P-type films are coated on top of the N-type films for diode I-V measurements.

scholarly journals REDUCING CLIMATE CHANGE BY INSTALLING A NEW PHOTOVOLTAIC POWER PLANT IN BULGARIA

2021 ◽  
Vol 12 (2) ◽  
Author(s):  
Plamen Tsankov
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Crystalline Silicon ◽  
Electrical Power ◽  
Operating Characteristics ◽  
Pv System ◽  
Photovoltaic Materials ◽  
Photovoltaic Power ◽  
Copper Indium ◽  
Simultaneous Testing

Three new roof-mounted 10 kWp grid-connected photovoltaic (PV) power plants have been constructed in the Technology Park at the Technical University of Gabrovo, Bulgaria, as part of a project "Competence Center – Intelligent Mechatronic, Eco, and Energy Saving Systems and Technologies". Three different PV modules types have been used: monocrystalline silicon (mono-Si), cadmium telluride (CdTe), and copper indium gallium selenide (CIGS). New three power plants, together with the existing amorphous silicon and poly-crystalline silicon photovoltaic power plants at the TU-Gabrovo enhanced simultaneous testing of five different photovoltaic materials. A small 500 Wp mono-Si photovoltaic thermal hybrid solar collectors (PVT) PV system has also been constructed. The power plants feature a monitoring system for the meteorological and electrical operating parameters, which measures, displays, and stores data on solar radiation, temperature, wind speed, currents, voltages, and electrical power of each power plant. PV plants components' technical characteristics are given in the paper. The schemes describing the basic wiring diagram, disposition of the three PV subsystems on the roof of the building at the technology center have also been presented. The initial comparative software data for monitoring of meteorological and electrical operating characteristics of the three different types of PV subsystems are shown as well. According to the specific ecological equivalent of energy resources and energy for the region of Bulgaria, the data are presented on the saved CO2 emissions from the avoided production and transmission of electricity owing to the operation of photovoltaic power plants.

The performance analysis and monitoring of grid-connected photovoltaic power plant

2020 ◽  
Vol 01 ◽  
Author(s):  
Farbod Esmaeilion ◽  
Abolfazl Ahmadi ◽  
Aryan Esmaeilion ◽  
M.A. Ehyaei
Keyword(s):  
Power Plant ◽  
Power Transformer ◽  
Performance Ratio ◽  
Energy Yield ◽  
Energy Agency ◽  
Photovoltaic Power ◽  
New Energy ◽  
Using Data ◽  
One Year ◽  
Photovoltaic Plant

Objectives: The purpose of this study is to analyze the performance of a one-megawatt photovoltaic power plant in Arak-Iran, according to IEC-61724 standard, using data recorded over a year. The photovoltaic plant of Arak is located at coordinates 34.0954° N and 49.7013° E. This power plant is the first-megawatt photovoltaic power plant in Iran which two types of modules are used and it was constructed by the New Energy Agency and the Power Research Center under the supervision of the Ministry of Energy in 2016. In this plant, a combination of monocrystal and polycrystalline modules is used, and the annual output is 1756 MWh. Methods: The combination of modules is based on the 1920 modules of 250 W of polycrystalline and 260 modules of 260 W of monocrystal in the construction of the power plant. There are also 4 inverters and a 1250 KVA dry power transformer. The plant has suitable productivity, with a performance ratio equal to 0.8 and a final yield of 4.57. Results: Ultimately the PV plant is simulated by PVsyst and the results are compared with monitored records which indicated the appropriate accuracy of the collected data. The calculated performance ratio for the power plant by PVsyst is 81.2% and has a 1.5% difference with the monitored totals. The energy supplied during one year by the power plant is 1756 MWh, whereas the prediction of annual energy yield that entered to the grid is equal to 1757 MWh.

Comparison of Different Options to Transport Energy in Photovoltaic Power Plant Using Centralized Inverter

2015 ◽  
Vol 785 ◽  
pp. 596-600
Author(s):  
Noorsharin Mohamed Nawawi ◽  
Chin Kim Gan ◽  
Pi Hua Tan
Keyword(s):  
Power Plant ◽  
Comparative Study ◽  
Standard Test ◽  
Photovoltaic Power ◽  
Test Conditions ◽  
The Cost

This paper presents a comparative study in terms of copper weight required and losses generated in transporting energy harvested in PV plant using different Centralized Inverter (CI) configurations. For the sake of simplicity, the Standard Test Conditions (STC) rated PV power value has been used in this study. The key findings suggest that different Combiner Box (CB) configurations in CI plays an important roles in determining the total conductor weight and losses attributed by each configuration. The outcome of this study will help the PV plant designers and system integrators to estimate the cost of solar cable of implementing different design configuration.

scholarly journals Experimental Evidence of PID Effect on CIGS Photovoltaic Modules

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 537 ◽  
Author(s):  
Sofiane Boulhidja ◽  
Adel Mellit ◽  
Sebastian Voswinckel ◽  
Vanni Lughi ◽  
Alessandro Ciocia ◽  
...  
Keyword(s):  
Crystalline Silicon ◽  
Stress Test ◽  
Standard Test ◽  
Negative Potential ◽  
Leakage Currents ◽  
Copper Indium ◽  
Current Voltage ◽  
Positive Voltage ◽  
Pv Modules ◽  
Power Point

As well known, potential induced degradation (PID) strongly decreases the performance of photovoltaic (PV) strings made of several crystalline silicon modules in hot and wet climates. In this paper, PID tests have been performed on commercial copper indium gallium selenide (CIGS) modules to investigate if this degradation may be remarkable also for CIGS technology. The tests have been conducted inside an environmental chamber where the temperature has been set to 85 °C and the relative humidity to 85%. A negative potential of 1000 V has been applied to the PV modules in different configurations. The results demonstrate that there is a degradation affecting the maximum power point and the fill factor of the current-voltage (I-V) curves. In fact, the measurement of the I-V curves at standard test condition show that all the parameters of the PV modules are influenced. This reveals that CIGS modules suffer PID under high negative voltage: this degradation occurs by different mechanisms, such as shunting, observed only in electroluminescence images of modules tested with negative bias. After the stress test, PID is partially recovered by applying a positive voltage of 1000 V and measuring the performance recovery of the degraded modules. The leakage currents flowing during the PID test in the chamber are measured with both positive and negative voltages; this analysis indicates a correlation between leakage current and power losses in case of negative potential.

Peculiarities of the juvenile period of the native Chechen genotypes of willow leaf pear (Pyrus salicifolia Pall.)

2020 ◽  
Vol 62 ◽  
pp. 32-38
Author(s):  
E. A. Dolmatov ◽  
R. B. Borzayev ◽  
A. N. Shaipov
Keyword(s):  
Chestnut Soil ◽  
Crop Breeding ◽  
Juvenile Period ◽  
Period 2 ◽  
Russian Research Institute ◽  
The Common ◽  
One Year ◽  
First Time ◽  
Selection Of ◽  
Creative Cooperation

The results of the study of the duration of the juvenile period of indigenous Chechen willow leaf pear genotypes (Pyrus salicifolia Pall.) are given in connection with the acceleration of the breeding process and the use of selected forms in pear breeding for high precocity. The studies were carried out in 2016-2019 at OOO “Orchards of Chechnya” in accordance with the Agreement on creative cooperation with the Russian Research Institute of Fruit Crop Breeding. The work was carried out in accordance with generally accepted programs and methods. The objects of the study were one-year and two-year-old pear seedlings obtained from sowing seeds of selected dwarf and low-growing local Chechen forms of willow pear (P. salicifolia Pall.), laying fruit buds on annual growths and seedlings of Caucasian pear (P. caucasica Fed.), 20 500 pcs. of each specie. The aim of the research was to study the potential of precocity of willow pear seedlings and to reveal of selected forms with the greatest degree of this trait. Stratified seeds were sown in the sowing department of the OOO “Orchards of Chechnya” production nursery in April, 2017. The seedlings were grown according to the common technology in dryland conditions on the plot with chestnut soil. The first fl owering of plants was noted in the spring, 2019. As a result of the research, for the first time on a large number of the experimental material it was found that in the off spring of the indigenous Chechen willow leaf pear genotypes, the selection of a little more than 2% of seedlings with a very short juvenile period (2 years) was possible. They are of great interest in accelerating the breeding process and in the selection of new pear varieties with high precocity. 20 willow leaf pear genotypes were selected for the further use in breeding for high precocity and as sources of the trait of short juvenile period.

scholarly journals Synthesis of ZSM-5 zeolites from biomass power plant ash for removal of ionic dyes from aqueous solution: equilibrium isotherm, kinetic and thermodynamic analysis

RSC Advances ◽  
2021 ◽  
Vol 11 (36) ◽  
pp. 22365-22375
Author(s):  
Guangbing Liang ◽  
Yanhong Li ◽  
Chun Yang ◽  
Xun Hu ◽  
Qingyin Li ◽  
...  
Keyword(s):  
Power Plant ◽  
Performance Testing ◽  
Value Added ◽  
Adsorption Performance ◽  
Original Intention ◽  
Power Plant Ash ◽  
Kinetic And Thermodynamic Analysis ◽  
Biomass Power Plant ◽  
First Time ◽  
Plant Ash

In this work, industrial biomass power plant ash was used to synthesize the ZSM-5 zeolites for the first time with the original intention to turn value-added material into wealth, and then committed to adsorption performance testing.

Sign in / Sign up

Export Citation Format

Share Document