Estimation of Power Output of Photovoltaic Systems based on Solar Irradiation, Statistical Models and Power Flow in Distribution Line

2014 ◽  
Vol 134 (6) ◽  
pp. 484-493 ◽  
Author(s):  
Pathom Attaviriyanupap ◽  
Takahisa Hirata ◽  
Yasuhiro Kojima ◽  
Marta Marmiroli
Keyword(s):  
Power Output ◽  
Statistical Models ◽  
Power Flow ◽  
Solar Irradiation ◽  
Photovoltaic Systems ◽  
Distribution Line

Influence of distribution line asymmetry on power flow results

2014 ◽  
Author(s):  
Izudin Dzafic ◽  
E. Halilovic ◽  
Rabih A. Jabr ◽  
Bikash C. Pal ◽  
Dino Ablakovic
Keyword(s):  
Power Flow ◽  
Line Asymmetry ◽  
Distribution Line

Research on a Comprehensive Evaluation Method for Multidrop Overload Control

2013 ◽  
Vol 433-435 ◽  
pp. 1103-1108
Author(s):  
Yu Tian Zhou ◽  
Fei Tang ◽  
Jie Zhao ◽  
Song Jun Wang ◽  
Ya Jun Wang ◽  
...  
Keyword(s):  
Power Output ◽  
Power Flow ◽  
Large Scale ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Evaluation Index ◽  
Overload Control ◽  
Power Outage ◽  
Comprehensive Evaluation Method ◽  
Matching Adjustment

Power flow shift being one of the main reasons that cause a large-scale blackout of power system, it is important to get the power flow shift under control at the beginning of the failure. In view of multidrop overload which frequently occurs in power outage, a comprehensive evaluation method is proposed to control the power flow shift. This method synthetically considers the control nodes' ability to eliminate the overload of the transmission in combination with PCA in which nodes' sensitivity of branch is selected as the evaluation index, divides them into two types (nodes that increase the power output to branch and others that decrease the power output to branch) and then obtains the control nodes' operation sequence. Additionally, a reverse equal matching adjustment is used to realize the control over multidrop overload. Typical numerical example is used to verify the effectiveness of the comprehensive evaluation method.

Development and Investigation of a Proposed Voltage Sag Index

2012 ◽  
Vol 1 (1) ◽  
pp. 72-91
Author(s):  
Alexis Polycarpou
Keyword(s):  
Power Flow ◽  
Voltage Sag ◽  
Flow Equations ◽  
Load Transmission ◽  
R Ratio ◽  
Mathematical Equations ◽  
Distribution Line ◽  
Transmission And Distribution ◽  
Load Angle

A proposed voltage sag index based on power flow equations is developed and investigated in this paper. The index supervises the power quality of a system, through calculating the voltage sag profile caused by an increase in reactive demand due to induction motor starting. Mathematical equations representing the load angle of the system are also derived. The accuracy of the index is investigated for a range of load, transmission, and distribution line X/R ratio values as well as various motor loading levels. Results demonstrate the effectiveness and applicability of the proposed index.

Wind, Photovoltaic anD Mini-Hydro Hybrid Generation in Bolivia: A Case Study at a Mountainous Village

2005 ◽  
Vol 29 (3) ◽  
pp. 271-286 ◽  
Author(s):  
Tsutomu Dei ◽  
Kiyoshi Hirata ◽  
Izumi Ushiyama
Keyword(s):  
Renewable Energy ◽  
Energy Balance ◽  
Power Output ◽  
Renewable Energy Sources ◽  
Solar Irradiation ◽  
Energy Sources ◽  
Generation System ◽  
Hybrid Generation ◽  
Site Monitoring

This paper investigates the most feasible configuration for hybrid generation by indigenous renewable energy sources in Chachacomani village at 4,220 meters elevation in Bolivia. Site monitoring of wind, solar irradiation and the water level of the Jarma River was conducted for a year. The data enabled potential power output from Wind, PV and Micro Hydro generation system to be estimated. Energy balance calculations for different configuration of hybrid generation system were made. The results show that the three energy supplies would be complementary for integrated power.

scholarly journals Maximization of Site-Specific Solar Photovoltaic Energy Generation through Tilt Angle and Sun-Hours Optimization

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Macben Makenzi ◽  
Joseph Muguthu ◽  
Evan Murimi
Keyword(s):  
Tilt Angle ◽  
Power Output ◽  
Energy Generation ◽  
Solar Irradiation ◽  
Energy Output ◽  
Solar Pv ◽  
Site Specific ◽  
Capital Costs ◽  
Conversion Rates ◽  
Industry Practice

Many photovoltaic solar projects do not achieve optimum energy and power outputs due to poor technical sizing and system design approaches. Concerns on low-conversion rates, high intermittencies, and high-capital costs still haunt PV projects. The establishment of design methodologies that would result in increased outputs from solar arrays is crucial in addressing the aforementioned issues. The tilt angles of installed PV modules are critical factors that influence the power output of solar modules. Several resources are available that provide generic linear fits and estimation of tilt angles for various global regions. However, very few are capable of determining precise, location-specific tilt angles that would allow for optimal power output and energy generation. This paper presents a methodology developed to establish the optimum tilt angles for solar panels installed at specific locations, thus ensuring maximum energy generation. The modeling is based on the maximization of the solar irradiation incident on the surface of a PV panel by considering multiple site-specific variables. Different sets of transcendent equations have been derived which were used to calculate optimum tilt angles and the subsequent energy generation from specific configurations of photovoltaic arrays. The resulting algorithms were used to determine optimum tilt angles and energy generation for solar PV installations in Athi River, Kenya. Dynamic and static optimal tilt angles were compared with the region’s baseline industry practice of using a fixed tilt angle of 15◦. It was observed that the dynamic tilt angles improved the daily solar energy output by up to 6.15%, while the computed optimal static tilt angle provided a 2.87% output increment. This improvement presents a significant impact on the technical specification of the PV system with a consequent reduction in the investment and operational cost of such installations. It further demonstrated that the use of the optimum static tilt angle results in cost and space savings of up to 2.8% as compared to the standard industry practice. Additionally, 5.8% cost and space savings were attained by the utilization of dynamic tilt angles.

scholarly journals Photocatalytic alginate fuel cells for energy production and refining of macroalgae

RSC Advances ◽  
2017 ◽  
Vol 7 (57) ◽  
pp. 35613-35618 ◽  
Author(s):  
Joyotu Mazumder ◽  
Hiroyuki Yoshikawa ◽  
Hideo Miyake ◽  
Toshiyuki Shibata ◽  
Eiichi Tamiya
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Power Output ◽  
Energy Production ◽  
Solar Irradiation ◽  
Carbon Sheet

An alginate fuel cell comprising a TiO2-modified carbon sheet (TiO2/C) anode was developed. The power output of the fuel cell and decomposition of alginate were enhanced by solar irradiation of the anode.

scholarly journals Statistical models of renewable energy intermittency

2020 ◽  
Vol 216 ◽  
pp. 01167
Author(s):  
I U Rakhmonov ◽  
K M Reymov
Keyword(s):  
Renewable Energy ◽  
Power Output ◽  
Statistical Models ◽  
Dust Storms ◽  
Smoothing Effect ◽  
Weather Event ◽  
Cloud Coverage ◽  
Mitigating Factors ◽  
Geographical Dispersion ◽  
Utility Network

One of the big mitigating factors of intermittency is the smoothing effect of geographical distribution of variable renewable energy (VRE ) plants on the aggregate power output of VRE generation on a utility network. The greater the distance between two renewable plants, the less likely their output is to be affected by the same weather event (e.g. cloud coverage, storms, dust storms). This is similarly the case for smaller timescales. Further, different technologies can often be uncorrelated or even negatively correlated (e.g. wind and solar) which reduces the integration cost. In this article analyzed and quantify the expected intermittency in Uzbekistan focusing on the geographical dispersion by looking at various sites as well as by looking at a portfolio composed of different technologies.

scholarly journals Performance Analysis of Supercapacitor Integrated PV Fed Multistage Converter with SMC Controlled VSI for Different Load Conditions

2018 ◽  
Vol 9 (2) ◽  
pp. 757
Author(s):  
Shruti Pandey ◽  
Bharti Dwivedi ◽  
Anurag Tripathi
Keyword(s):  
Performance Analysis ◽  
Power Flow ◽  
Sliding Mode ◽  
Supply System ◽  
Solar Irradiation ◽  
Nonlinear Loads ◽  
Proposed Model ◽  
Terminal Voltage ◽  
Linear And Nonlinear ◽  
Load Conditions

<span lang="EN-US">The proposed work comprises of an MPPT controlled Photovoltaic (PV) source, in conjunction with a supercapacitor, cascaded with a Sliding Mode Controlled (SMC) Inverter, supplying variable linear and nonlinear loads. The effects of varying solar irradiation and its intermittency have been effectively managed by the MPPT controlled boost converter and charge controlled supercapacitor respectively. The charge controller bucks and boosts the terminal voltage and realizes the power flow in a bidirectional manner. Seamless action has been obtained by the proposed model under varying irradiation and for varying load conditions. The performance of the SMC controlled Inverter, when compared with a PI controlled Inverter, has been found to be superior in terms of power quality and robustness of the supply system</span>

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