scholarly journals Reduction of Voltage Ripple in DC Link of Wind Energy Conservation System Using Modified DC-DC Boost Converter

2021 ◽  
Author(s):  
L. Hubert Tony Raj ◽  
R. Sivakumar ◽  
R. Akash ◽  
M. Anandha Chakravarthi
Keyword(s):  
Renewable Energy ◽  
Demand Curve ◽  
Renewable Energy Sources ◽  
Clean Energy ◽  
Vertical Axis ◽  
Power Converter ◽  
Solar Pv ◽  
Vertical Axis Wind Turbine ◽  
Energy Applications ◽  
Hybrid Renewable Energy

Renewable energy provisions must be extracted in a more resourceful way, with a power converter added to the mix. If the supply-demand curve rises with the seasons, it becomes clear that renewable energy sources are used to provide clean energy. This clean energy cannot be used on load directly due to fluctuating conditions, to solve this problem a modified DC to DC converter with a ripple-free output is introduced. The Vertical Axis Wind Turbine (VAWT) and Solar PV were combined to achieve a constant DC output in a hybrid renewable energy conversion system. For renewable energy applications, a redesigned converter with ripple-free output is used. The simulation is made under MATLAB/SIMULINK and experimental parameters were measured using a nominal prototype.

scholarly journals Reduced Switch Multilevel Inverter Topologies And Modulation Techniques For Renewable Energy Applications

2021 ◽  
Vol 12 (3) ◽  
pp. 4659-4670
Author(s):  
Ujwala Gajula Et.al
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Harmonic Distortion ◽  
Power Converter ◽  
Multilevel Inverter ◽  
Medium Voltage ◽  
Multilevel Inverters ◽  
Energy Applications ◽  
Converter Topology ◽  
Overall Performance

Multilevel inverters (MLIs) have been extensively used and gained interest over last few decades in industrial and grid connected renewable energy applications because of its numerous merits. Besides various advantages like obtaining reduced harmonic distortion and lesser dv/dt stress across switches it has the capability of generating any number of levels. The theory of multilevel concept was initiated for high power and high/medium voltage applications as they are helpful in interfacing with renewable energy sources. By proper combination of the switches it generates a stair case output with reduced harmonic distortion because of this MLI is widely used and it became one of the advanced power converter topology. The rise of new topologies has attained importance over conventional multilevel inverter topologies, which generates more number of levels with reduced switch components. This paper presents various conventional MLI topologies and hybrid MLI topologies for renewable energy applications. Also, this review paper includes different modulation strategies which plays an important role to improve the overall performance of MLI.

Numerical Investigation to Assess an Optimal Blade Profile for the Drag Based Vertical Axis Wind Turbine

2013 ◽  
Author(s):  
Sukanta Roy ◽  
Ujjwal K. Saha
Keyword(s):  
Renewable Energy ◽  
Wind Energy ◽  
Wind Turbines ◽  
Energy Demand ◽  
Computational Study ◽  
Flow Behavior ◽  
Renewable Energy Sources ◽  
Vertical Axis ◽  
Small Scale ◽  
Vertical Axis Wind Turbine

Rapid depletion rate of fossil fuels with an increasing energy demand and their high emission are imposing the evolution activities in the arena of renewable energy. To meet the future demands of renewable energy sources, wind energy is a very promising concept. In this feature, the drag based vertical axis wind turbines (VAWTs) are suitable for small scale wind energy generation for decentralized locations. However, these turbines have low power and torque coefficients as compared to other wind turbines. Numerous blade shapes have been proposed till now to improve the performance of these turbines. In the present paper, a computational study has been performed to simulate the air-flow over different blade profiles using shear stress transport (SST) k–ω turbulence model. The results obtained are validated with the available experimental data. In the dynamic simulations, the power and torque coefficients are calculated considering the blade arc angle as the variable shape parameter. The effects of drag and lift forces on the variable blade shapes are also studied in static simulations at various angular positions. The present paper tries to demonstrate an effective computational methodology to predict the flow behavior around a drag based VAWT. Through this study, it has been found possible to select an optimal blade shape from the point of its aerodynamic performance.

scholarly journals The Investigation of Savonius Type and Darrieus H Type Wind Turbine Simulation with Wind Speed Variable

2021 ◽  
Vol 1 (2) ◽  
pp. 19-26
Author(s):  
Wibby Aditya Putra Utama ◽  
Yohandri Bow ◽  
M. Syahirman Yusi
Keyword(s):  
Renewable Energy ◽  
Wind Speed ◽  
Wind Turbine ◽  
Energy Demand ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Vertical Axis ◽  
Renewable Energy Resources ◽  
Vertical Axis Wind Turbine ◽  
Fan Speed

The demand for electrical energy that continues to increase along with the advancement of civilization and also the increasing number of people as well as the reduced level of fulfillment and availability of non-renewable energy sources, it is necessary to have renewable energy resources that capable of fulfill these energy demand in a more environmental friendly. One of the natural energies that we can use is wind energy, which is easy to get and lasts continuously. This research examines the comparison of the power generated from the vertical axis wind turbine savonius type and darrieus H type. The wind that use in this research get from from the fan. The test is doing by varying the wind speed by adjusting the fan speed. The fan is directed to the wind turbine to rotate the wind turbine. To measure the wind speed produced by the fan, a digital anemometer is used. The result of this research is the relation data of voltage to rpm and voltage to wind speed of wind turbine.

scholarly journals Small Scale Vertical Axis Wind Turbine

2021 ◽  
Author(s):  
Sahishnukumar Shah
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Wind Turbine ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Electrical Power ◽  
Vertical Axis ◽  
Energy Sources ◽  
Small Scale ◽  
Vertical Axis Wind Turbine

The small-scale vertical axis wind turbine is designed and modeled in this project, considering all aspects of wind turbine such as Blade design, stator design, rotor design and converter system design. Electric Power has become a prime necessity for any country for economic development. The conventional fuel sources for power generation are depleting fast. The favorable alternatives are renewable energy sources. Although more invention has to be carried out in the field of renewable energy sources, every little effort in this direction may provide a solution to reach most economical power generation point. Hence the same topic was selected for Masters Project. The goal of this project is to design a small scale Vertical Axis Wind Turbine, which is capable of producing electrical power even with low wind velocity. It can be placed on road dividers, sidetracks of train or remote places i.e. villages, military camps, where it is not economical to transmit power from power plants. Implementation of such project would reduce the dependence of an industry or remote houses, on electricity board.

scholarly journals Optimal Configuration and Sizing of an Integrated Renewable Energy System for Isolated and Grid-Connected Microgrids: The Case of an Urban University Campus

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3527
Author(s):  
Navid Shirzadi ◽  
Fuzhan Nasiri ◽  
Ursula Eicker
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Capital Intensity ◽  
Vertical Axis ◽  
Energy System ◽  
Solar Pv ◽  
Grid Connection ◽  
Cost Of Energy ◽  
Solar Tracker ◽  
Cost Efficient

Although renewable technologies are progressing fast, there are still challenges such as the reliability and availability of renewable energy sources and their cost issues due to capital intensity that hinder their broad adoption. This research aims at developing a configuration-sizing approach to enhance the cost efficiency and sourcing reliability of renewable energies integrated in microgrids. To achieve this goal, various technologies were considered, such as solar PV, wind turbines, converters, and batteries for system configuration with minimization of net present cost (NPC) as the objective. Grid connection scenarios with up to 100% renewable contribution were analyzed. The results show that the integration of renewable technologies with some grid backup could reduce the levelized cost of energy (LCOE) to about half of the price of the electricity that the university purchases from the grid. Also, different kinds of solar tracker systems were studied. The outcome shows that by using a vertical axis solar tracker, the LCOE of the system could be reduced by more than 50 percent. This research can help the decision-maker to opt for the best scenarios for generating reliable and cost-efficient electricity.

scholarly journals Small Scale Vertical Axis Wind Turbine

2021 ◽  
Author(s):  
Sahishnukumar Shah
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Wind Turbine ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Electrical Power ◽  
Vertical Axis ◽  
Energy Sources ◽  
Small Scale ◽  
Vertical Axis Wind Turbine

The small-scale vertical axis wind turbine is designed and modeled in this project, considering all aspects of wind turbine such as Blade design, stator design, rotor design and converter system design. Electric Power has become a prime necessity for any country for economic development. The conventional fuel sources for power generation are depleting fast. The favorable alternatives are renewable energy sources. Although more invention has to be carried out in the field of renewable energy sources, every little effort in this direction may provide a solution to reach most economical power generation point. Hence the same topic was selected for Masters Project. The goal of this project is to design a small scale Vertical Axis Wind Turbine, which is capable of producing electrical power even with low wind velocity. It can be placed on road dividers, sidetracks of train or remote places i.e. villages, military camps, where it is not economical to transmit power from power plants. Implementation of such project would reduce the dependence of an industry or remote houses, on electricity board.

scholarly journals Multi-Port PWM DC-DC Power Converter for Renewable Energy Applications

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3490
Author(s):  
Abdulaziz Almutairi ◽  
Khairy Sayed ◽  
Naif Albagami ◽  
Ahmed G. Abo-Khalil ◽  
Hedra Saleeb
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Renewable Energy Sources ◽  
Power Converter ◽  
Energy Sources ◽  
Slow Response ◽  
Power Sources ◽  
Energy Applications ◽  
Dc Power ◽  
The Impact

In this paper, a new multi-port DC-DC power converter used to deal with the intermittent nature and slow response in renewable energy applications is proposed. The proposed converter integrates a DC-DC converter and a DC-AC inverter, and the proposed circuit integrates various renewable energy sources in addition to the energy storage unit. By combining renewable energy sources with a statistical trend to offset each other, the impact of the intermittency can be considerably minimized. This combination increases the overall system reliability and usability. Moreover, integrating such systems with energy storage systems can overcome the slow response issue of renewable sources. It can provide the additional energy required by the load or absorb the extra energy provided by the power sources, which greatly improves the dynamics of the overall system. The proposed converter can reduce the system cost and size and improve the efficiency and reliability. The operation principle is studied in detail, and the design considerations are provided. The proposed architecture and its control strategy were analyzed and studied using the Simulink/MATLAB environment. Finally, the feasibility of the proper operation of the studied converter was experimentally verified based on the results of experimental studies conducted on a 300 W prototype implemented in a laboratory.

scholarly journals Assessment of Hybrid Energy Sources

2019 ◽  
Vol 9 (2) ◽  
pp. 4715-4720
Keyword(s):  
Renewable Energy ◽  
Power Supply ◽  
Renewable Energy Sources ◽  
Energy System ◽  
Energy Sources ◽  
Solar Pv ◽  
Hybrid Energy ◽  
Remote Locations ◽  
Using Data ◽  
Hybrid Renewable Energy

This paper comprises exploration of hybrid renewable energy sources (RES) such as solar PV, wind Energy etc. with respect to solar radiation and velocity of wind. Hybrid energy system is a magnificent option for providing power supply to remote locations where grid supply is not reachable. The renewable energy sources (RES) are integrated through DSP with proper programming such that maximum power is fetched through RES. Variations in the output power of solar and wind is analyzed using data obtained through proper integration of RES. The foremost objective of proposed paper is to provide uninterrupted power supply to demand side with scrutiny of hybrid energy sources.

Power Projects and Covid-19: A Practical Analysis of the Relevance of Force Majeure Clauses under the Standardised Power Purchase and Implementation Agreements of Uganda

2020 ◽  
Vol 1 (2) ◽  
pp. 189-193
Author(s):  
Aisha Naiga ◽  
Loyola Rwabose Karobwa
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Clean Energy ◽  
The State ◽  
Energy Sources ◽  
Policy Goals ◽  
Force Majeure ◽  
Practical Analysis ◽  
Energy Justice

Over 90% of Uganda's power is generated from renewable sources. Standardised Implementation Agreements and Power Purchase Agreements create a long-term relationship between Generating Companies and the state-owned off-taker guaranteed by Government. The COVID-19 pandemic and measures to curb the spread of the virus have triggered the scrutiny and application of force majeure (FM) clauses in these agreements. This article reviews the FM clauses and considers their relevance. The authors submit that FM clauses are a useful commercial tool for achieving energy justice by ensuring the continuity of the project, despite the dire effects of the pandemic. Proposals are made for practical considerations for a post-COVID-19 future which provides the continued pursuit of policy goals of promoting renewable energy sources and increasing access to clean energy, thus accelerating just energy transitions.

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