scholarly journals Wind energy system in Ambocas-Ecuador: distributed generation and energy quality

2021 ◽  
Vol 19 ◽  
pp. 609-613
Author(s):  
O. Cabeza-Gras ◽  
◽  
V. Jaramillo-García ◽  

In this communication we present the construction of a wind farm, WF, with 10 MW of nominal power. This WF will increase the quantity and quality of electricity in the area of Ambocas, Loja, Ecuador, strengthen a system with many voltage drops. The place chosen is ideal, because it is long from population, in a hill side near an existing road. Wind is persistent and has a constant orientation all along the year. The generated power will be connected with the electricity system in the Portovelo Substation, which is about 12 km from the WF site. We have calculated the expected electricity production all along the year taking into account all important data to simulate successfully the WF operation in real conditions. We have also modelled the interconnexion of the WF with the substation and its effect in the 69 kV bar. Finally, a brief economical analysis of the project gives an annual average profit higher than 3.5 USD million without taxes, while the inversion would be cancelled in less than 5 years of the 20 ones planned for the WF in full operation.

2019 ◽  
Vol 4 (9) ◽  
pp. 1-8
Author(s):  
Montaser Abd El Sattar ◽  
Adel A. Elbaset ◽  
Ali H. KasemAlaboudy ◽  
Wessam Arafa Hafez

Wind energy system is lately receiving a lot of attention, because they are cost inexpensive, environmental safe and clean renewable energy source, as compared with nuclear and fossil fuel power generation. The operational characteristics of wind electric turbines has considerable dissatisfaction and stress on the quality of electric power system. Harmonics, variations of voltage and reactive power are most of power quality issues for grid connected with wind turbine. This paper introduces a design and simulation of unified power quality conditioner using a fuzzy controller to improve the power quality for Egyptian power grid connected to Zafarana Egypt wind system. The proposed performance of the unified power quality conditioner system is verified by simulating the model using MATLAB/SIMULINK environment. The simulation results showed that the proposed unified power quality conditioner provide efficient cancellation of both load current  harmonics  and supply voltage sag in addition to compensation of reactive power, and thus making the electrical grid connected wind energy system more efficient by improving the quality of power.


2021 ◽  
pp. 75-86
Author(s):  
A. Gai ◽  
◽  
V. Gulevich ◽  

Today, the electricity supplier is not able to declare the possible level of quality of electricity supply, and the consumer simply does not have the opportunity to buy such "high-quality" electricity. In such conditions, a differentiated approach to tariff formation is inevitable, which has been implemented in practice today, albeit in its infancy. Further improvement of the tariff-forming mechanism is impossible without creating a "flexible" dependence of the tariff on the quality indicators of the consumer's power supply. Quality indicators, in turn, are based, on the one hand, on the methods and approaches for their determination, and on the other, on statistically reliable data on the elements that make up the equipment in the "generation-consumer" chain. In recent years, there has been a tendency to change the concept of development of the electric power industry, since preference is given to the development of sources of distributed generation. Distributed generation is understood as a source of electrical energy directly connected to the distribution electrical network or connected to it by consumers. Ensuring the socio-economic stability of society and a decent quality of life for the population largely depends on the reliability and efficiency of the functioning of the infrastructure for the supply of fuel and energy resources, in particular, electricity. Excessive losses of electricity during its production, transportation and distribution, as well as an unacceptable level of harmful emissions into the atmosphere, are the cause of interruptions in power supply to consumers and even the threat of systemic accidents in the United Energy System (UPS) of the country. The introduction of alternative energy sources in electric power systems, in addition to reducing the harmful impact on the environment and solving the problems associated with waste pollution during electric power generation, will reduce the use of natural resources and relieve the backbone and distribution power lines. As part of the scientific search, an approach was proposed, which is the basis for calculations to determine the optimal installation locations for sources of distributed generation of an average overhead line. The results obtained are presented in the framework of a joint technical meeting of leading specialists of operating enterprises, the customer and the staff of the Department of Power Supply named after V.M. Sinkova NULES of Ukraine.


Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 116
Author(s):  
Houda El Alami ◽  
Badre Bossoufi ◽  
Saad Motahhir ◽  
Eman H. Alkhammash ◽  
Mehedi Masud ◽  
...  

This paper presents a new contribution of the nonlinear control technique of electrical energy in a wind energy system. The nonlinear sliding mode technique used to control the powers of the DFIG-Generator is connected to the power grid by two converters (grid side and machine side). The proposed model is validated using tracking and robustness tests with a real wind speed. The control was developed under Matlab/Simulink, and the FPGA in the Loop technique was used to design the DFIG model. By employing a co-simulation, the purpose is to test the controller for the FPGA simulated model or system in its entirety. The results obtained by the cο-simulation show the efficiency of the proposed model in terms of speed and robustness with a rate THD = 0.95, and the proposed model of the sliding mode controller shows a significant improvement in the quality of energy produced by the wind system.


Author(s):  
Martin Rüdisüli ◽  
Sinan L. Teske ◽  
Urs Elber

Electrifying the energy system with heat pumps and battery electric vehicles (BEV) is a strategy of Switzerland and many other countries to reduce CO$_{2}$ emissions. A large electrification, however, poses several new challenges for the electricity system, particularly in combination with a simultaneous substitution of nuclear power plants (NPP) by volatile renewables such as photovoltaics (PV). In this study, these challenges in terms of additional electricity demands, deficits and surpluses as well as effective CO$_{2}$ mitigation are assessed in a dynamic and data-driven approach. To this end, electricity demand and production profiles are synthesized based on measured data and specifications and assumptions of the key technologies at a high temporal resolution. The additional electricity demand of heat pumps is estimated from hourly measured heat demand profiles of a Swiss district heating provider, while for BEV different recharging patterns are combined. For electricity production, NPP are deducted from the current electricity production profile, while PV is added at an hourly resolution. In order to estimate CO$_{2}$ emissions, life-cycle (LCA) CO$_{2}$ intensities of the different technologies are used. It could be shown, that with a BEV and heat pump penetration of 20% and 75%, respectively, there is an almost 25% (13.7 TWh/year) increase of the electricity demand and - just as challenging - an additional maximum power requirement of 5.9 GWh/h (hourly-averaged power). Without additional storage options, large amounts of electricity must be imported in winter and at night, while in summer at noon there is a large surplus from PV. Due to their high CO$_{2}$ intensities - at least for the next decades - electricity imports and PV may - depending on the reference scenario (with or without NPP) and assumptions on other key parameters - even offset the overall CO$_{2}$ savings of a highly electrified Swiss energy system.


Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2399 ◽  
Author(s):  
Martin Rüdisüli ◽  
Sinan L. Teske ◽  
Urs Elber

Electrifying the energy system with heat pumps and battery electric vehicles (BEV) is a strategy of Switzerland and many other countries to reduce CO2 emissions. A large electrification, however, poses several new challenges for the electricity system, particularly in combination with a simultaneous substitution of nuclear power plants (NPP) by volatile renewables such as photovoltaics (PV). In this study, these challenges in terms of additional electricity demands, deficits and surpluses as well as effective CO2 mitigation are assessed in a dynamic and data-driven approach. To this end, electricity demand and production profiles are synthesized based on measured data and specifications and assumptions of the key technologies at a high temporal resolution. The additional electricity demand of heat pumps is estimated from hourly measured heat demand profiles of a Swiss district heating provider, while for BEV different recharging patterns are combined. For electricity production, NPP are deducted from the current electricity production profile, while PV is added at an hourly resolution. In order to estimate CO2 emissions, life-cycle analysis (LCA) CO2 intensities of the different technologies are used. It is shown that with a BEV and heat pump penetration of 20% and 75%, respectively, there is an almost 25% (13.7 TWh/year) increase of the electricity demand and—just as challenging—an additional maximum power requirement of 5.9 GWh/h (hourly-averaged power). Without additional storage options, large amounts of electricity must be imported in winter and at night, while in summer at noon there is a large surplus from PV. Due to their high CO2 intensities—at least for the next decades—electricity imports and PV may—depending on the reference scenario (with or without NPP) and assumptions on other key parameters—even offset the overall CO2 savings of a highly electrified Swiss energy system.


2018 ◽  
Vol 70 ◽  
pp. 01016
Author(s):  
Karol Tucki ◽  
Anna Bączyk ◽  
Izabela Wielewska ◽  
Michał Piątkowski

The purpose of this paper was to analyse the operation of a wind farm and the wind turbine yields with a total capacity of 46.5 MW. The analysis was divided into two stages: (1) the general characteristics of the facility, which included: a) distribution of wind speeds and the method of calculation and visualisation of the estimated electricity production, b) evaluation of the wind farm operation as per type of tested turbine and the wind farm terrain and (2) the impact of the facility on the quality of electricity in the distribution network.


2016 ◽  
Vol 17 (6) ◽  
pp. 619-630 ◽  
Author(s):  
Snehaprava Swain ◽  
Pravat Kumar Ray

Abstract In this paper a three phase fault analysis is done on a DFIG based grid integrated wind energy system. A Novel Active Crowbar Protection (NACB_P) system is proposed to enhance the Fault-ride through (FRT) capability of DFIG both for symmetrical as well as unsymmetrical grid faults. Hence improves the power quality of the system. The protection scheme proposed here is designed with a capacitor in series with the resistor unlike the conventional Crowbar (CB) having only resistors. The major function of the capacitor in the protection circuit is to eliminate the ripples generated in the rotor current and to protect the converter as well as the DC-link capacitor. It also compensates reactive power required by the DFIG during fault. Due to these advantages the proposed scheme enhances the FRT capability of the DFIG and also improves the power quality of the whole system. Experimentally the fault analysis is done on a 3hp slip ring induction generator and simulation results are carried out on a 1.7 MVA DFIG based WECS under different types of grid faults in MATLAB/Simulation and functionality of the proposed scheme is verified.


2010 ◽  
Vol 74 ◽  
pp. 297-302 ◽  
Author(s):  
Piet Sonneveld ◽  
Gert Jan Swinkels

In an previous research project a new type of greenhouse with an integrated concentrated photovoltaic system (CPV) was developed which has an integrated filter for reflecting the near infrared radiation (NIR) to the greenhouse and exploiting this radiation in a solar energy system. The performance of the system was promising. In this study further optimalisations of the CPV system are made to avoid the large construction for solar tracting. Hereto all parts will be integrated into the greenhouse. The NIR-reflector material is carried out as a NIR-reflective lamllea system and the CPV–module is mounted into the ridge. In this paper the results of the optimization process of the CPV system based on NIR reflecting lamellae is presented. The optimization process is based on a maximal total annual electricity production and is performed with a ray tracing model and actual radiation data. Results show that the optimization of the lamellae greenhouse can be seen from a theoretical and a practical point of view. Theoretically, the number of lamellae for the investigated concept must be high (>100) and focus with a generic focal length of 3.5 m and glazing bars must be avoided. Then the maximal annual electricity output can be over 26 kWh/m². In practice, mechanical restrictions, plant conditions and costs will determine the implementation. The proposed CPV-system has positive side-effects like reducing the heat load (and need for cooling) during summer and blocking of the direct radiation which can be harmful for some crops. With this, the feasibility of the system depends greatly on local conditions which require a tailor-made economical analysis.


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