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[IEEE 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Kota Kinabalu, Malaysia (2018.10.7-2018.10.10)] 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Determination of Penetration Limit of Solar Distributed Generation (DG) Considering Multiple Bus Integration
摘要： Solar distributed generation (DG) integrated into the distribution system has contributed significant effects such as reduced power losses and improved voltage profile. The reliability and power quality of the technology may be affected at high penetration that may result to high voltage fluctuations and reverse power flow. Thus, the maximum allowable penetration level of solar DG must be determined. By using genetic algorithm as an approach, this study determines the penetration limit of solar DG in the network considering multiple bus integration. Simulations were implemented in IEEE 37-bus test system utilizing the Component Object Model (COM) interface of MATLAB and OpenDSS. Results showed that considering the penetration limit of solar DG resulted to significant improvements in power losses and voltage profile. Moreover, the maximum allowable limit of the DG installed to 18 different buses showed the highest reduction of power losses and the lowest average total voltage deviation.
关键词： power losses,OpenDSS,MATLAB,penetration limit,genetic algorithm,solar distributed generation
更新于2025-09-23 15:22:29
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Effects of dust, soiling, aging, and weather conditions on photovoltaic system performances in a Saharan environmenta??Case study in Algeria
摘要： Solar photovoltaic (PV) power represents one of the most promising future sources of energy in the world. Considered the cleanest form of energy, extensive research is being undertaken to widen its use. Notably, mega projects are being considered for installation in the Middle East and North Africa (MENA) region because of its high solar potential, with hopes of eventually feeding Europe from the PV electricity generated in this region and transported through high voltage direct current (DC) lines. However, current implementation of PV systems has shown that their reliability and efficiency depend upon surrounding environmental factors, such as the ambient temperature, wind, and rainfall, as well as soiling, pollution, and aging. The aim of this study was to investigate, through experimental tests, the effects of such factors on the power output of a grid connected PV station. The results showed that the output power and efficiency are deeply affected by various environmental factors, which are weather dependent. These findings may help us develop appropriate solutions to overcome these drawbacks.
关键词： Soiling,Dust,Power losses,Aging,Grid connected PV
更新于2025-09-23 15:19:57
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Improved Coyote Optimization Algorithm for Optimally Installing Solar Photovoltaic Distribution Generation Units in Radial Distribution Power Systems
摘要： This paper proposes an improved coyote optimization algorithm (ICOA) for optimizing the location and sizing of solar photovoltaic distribution generation units (PVDGUs) in radial distribution systems. In the considered problem, four single objectives consisting of total power losses, capacity of all PVDGUs, voltage profile index, and harmonic distortions are minimized independently while satisfying branch current limits, voltage limits, and harmonic distortion limits exactly and simultaneously. The performance of the proposed ICOA method has been improved significantly since two improvements were carried out on the two new solution generations of the conventional coyote optimization algorithm (COA). By finding four single objectives from two IEEE distribution power systems with 33 buses and 69 buses, the impact of each proposed improvement and two proposed improvements on the real performance of ICOA has been investigated. ICOA was superior to COA in terms of capability of finding higher quality solutions, more stable search ability, and faster convergence speed. Furthermore, we have also applied five other metaheuristic algorithms consisting of biogeography-based optimization (BBO), genetic algorithm (GA), particle swarm optimization algorithm (PSO), sunflower optimization (SFO), and salp swarm algorithm (SSA) for dealing with the same problem and evaluating further performance of ICOA. The result comparisons have also indicated the outstanding performance of ICOA because it could find much better results than these methods, especially SFO, SSA, and GA. Consequently, the proposed ICOA is a very effective method for finding the optimal location and capacity of PVDGUs in radial distribution power systems.
关键词： voltage profile,harmonic distortions,power losses,coyote optimization algorithm,solar photovoltaic distribution generation units,radial distribution systems
更新于2025-09-23 15:19:57
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The Active Power Losses in the Road Lighting Installation with Dimmable LED Luminaires
摘要： In accordance with the requirements of PN EN 13201-5 standard for road lighting installation, energy performance indicators should be descripted. In order to calculate energy performance indicators, it is necessary to know the active power of the road lighting system. The above standard does not specify whether active power losses should be taken into account in calculations. The main purpose of the article is to estimate the active power losses in the road lighting installation. The article presents methods for calculating active power losses, taking into account losses in all main elements of the installation. The obtained calculation results show the relationship between active power losses and the power of luminaires, their number and spacing between poles. Calculations of active power losses were made for single-phase and three-phase installations. The active power losses in a three-phase system do not exceed 1.5% and in a single-phase installation they may be greater than 7%. Therefore, in order to obtain exact values of energy performance indicators (and also predict electricity consumption), active power losses should be taken into account in calculations. In addition, a comparative analysis of the effect of luminaires dimming and active power losses on annual CO2 emissions was made. Not taking into account the active power losses in the calculation of the lighting installation’s power, for single-phase installations in particular, understates the calculated value of CO2 emissions by more than 6%.
关键词： power losses,road lighting,LED luminaires
更新于2025-09-23 15:19:57
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Estimation of power loss spectra in slightly flattened distorted Bragg fiber waveguide
摘要： Dispersion characteristic and fiber loss spectra of a Bragg fiber waveguide having slightly flattened distortion are estimated for sensing applications. The characteristic and optical power loss equations of waveguide are obtained by matching the fields at various boundaries under quarter wave stack conditions. It is found that the optimum power loss is inversely proportional to the ninth power of distortion coefficient. The obtained results show that optimum fiber loss decreases with decrease of refractive index of cladding layer ′ ′b (low refractive index layer) and increase of refractive index of cladding layer ′ ′a (high refractive index layer). Also, fiber losses are estimated with increase of the high and low refractive index cladding layer losses. This loss spectrum of fiber can be considered as sensing signal. Since obtained fiber losses in distorted Bragg fiber are higher than standard Bragg fiber therefore, the sensitivity of proposed structure is higher than the standard Bragg fiber. Also, the sensitivity increases with the increase of refractive index of core medium. These results would be helpful to design a novel highly sensitive sensor based on hollow core distorted Bragg fiber.
关键词： Power losses,Distorted Bragg fiber,Dispersion curve,Sensitivity
更新于2025-09-23 15:19:57
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[IEEE 2019 International Ural Conference on Electrical Power Engineering (UralCon) - Chelyabinsk, Russia (2019.10.1-2019.10.3)] 2019 International Ural Conference on Electrical Power Engineering (UralCon) - Development of Method for Photovoltaic Generation Control by Electrical Network Relative Power Losses Minimization Criteria
摘要： In recent years, the world practice shows that in many developed countries the use of renewable energy sources has become an important factor for the sustainable development of their energy sector. The integration of solar power plants into the electric networks is one of the most important directions for the development of energy, but the issue of the influence of solar generation on the modes of electric distribution networks and the relative power loss is acute. This paper analyzes the effect of distributed solar generation on power losses and the configuration of the load curve. The problem of excessive solar generation at the weekend causes the flow of active power from the consumer to the power system, which leads to a change in the configuration of the load curve and an increase in the relative power losses. A calculation method is proposed to minimize relative power losses in electric networks, which allows improving the efficiency of the electric grid company in the conditions of integration of distributed solar generation. Also, to confirm the correctness of the calculation results of the proposed method, variational calculations were carried out.
关键词： Shape factor,Power losses,Load curve,Republic of Tajikistan,Solar generation
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Clean Electrical Power (ICCEP) - Otranto, Italy (2019.7.2-2019.7.4)] 2019 International Conference on Clean Electrical Power (ICCEP) - Comparative Analysis of Partial Shading Power Losses in Photovoltaic Topologies
摘要： The productivity of photovoltaic (PV) system is highly affected by the environmental conditions. The impact of partial shading conditions (PSC) on PV systems with various topologies is not necessarily the same. It is essential to demonstrate the role of PV topology in alleviating partial shading power losses. This paper presents a thorough comparative analysis of power losses incurred under partial shading conditions over different reported PV topologies. Power losses are analyzed for equally-rated PV systems subject to the same environmental conditions to highlight the privilege of some topologies over others. Power losses analysis is carried out based on the level of maximum power point tracking (MPPT).
关键词： partial shading conditions (PSC),power losses,photovoltaic (PV) system,maximum power point tracking (MPPT),PV topologies
更新于2025-09-12 10:27:22
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[IEEE 2019 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM) - Sochi, Russia (2019.3.25-2019.3.29)] 2019 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM) - Optimization of Attachment Place of Two Photovoltaic Systems to Power Line with Distributed Load
摘要： Distributed generation based on photovoltaic systems is of interest for scientists and specialists, since it has an impact on power losses in distribution networks and voltage deviations at consumers, due to the change in power flows from busbars. The article analyzes the effect of connecting two photovoltaic systems to a power line with a distributed load in terms of power losses. As the objects of research, the systems of power supply to poultry farms were analyzed. Two methods have been proposed for determining the optimal power and places of connection of photovoltaic systems from the obtained analytical expressions for minimum electric power losses in a power line with distributed load, and based on the developed nomogram making it possible to determine approximately different sets of distances and powers of photovoltaic systems.
关键词： optimum active power,losses of electrical energy,grid-connected photovoltaic system,photovoltaic system,power supply diagram
更新于2025-09-11 14:15:04
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Recent Development in Ferrite Material for High Power Application [Passive Components]
摘要： There is no doubt that power electronics is playing a critical role in the evolution of the overall infrastructure of energy supply, from motion control and drives to industry automation and traction techniques. However, unlike decades of impressive developments in semiconductor technologies, the developments in the passive components arena, especially in magnetic components, have been rather slow and have been seen as a power system bottleneck in terms of efficiency and miniaturization. To fully tap the benefits of next-generation semiconductors, namely, silicon carbide (SiC) and gallium nitride power devices, the next-generation passive components, particularly magnetic components, must be compatible with these emerging devices, especially at high frequencies and under high pulse excitation. In essence, high saturation and low-power losses under pulse excitation and relatively high temperatures are required. Current power converters using MnZn-ferrite magnetic materials possess saturation induction (Bs) levels around 530 mT at room temperature that decrease down to 430 mT at 100 °C. It is to be noted that the Bs is measured according to the IEC standard for polycrystalline ferrite under room temperature, at a field strength of 1194 A/m and 10 kHz, which is far beyond the application range. The applicable field strength varies between 100 and 200 A/m depending on the industry (aerospace, industry, and consumer electronics). Accordingly, the power losses of these materials at 1 MHz and 50 mT vary from around 350 mW/cc at room temperature to approximately 1 W/cc at 100 °C. The measuring condition is still under the sinusoidal mode.
关键词： MnZn-ferrite,power losses,ferrite material,saturation induction,high power application
更新于2025-09-10 09:29:36