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Design and optimization of grid-tied and off-grid solar PV systems for super-efficient electrical appliances
摘要： Modeling, simulation, and optimization methods are used in the present study to design grid-tied and off-grid solar PV systems for super-efficient electrical appliances for residential buildings. The principal objective of this study is to design a renewable energy system to serve the electric load of super-efficient appliances with high penetration of renewable resources and low greenhouse gas emissions and cost of energy. Hourly calculations using optimization method are used to study the daily and yearly performance and the cost of the renewable energy systems. A comparison between the performance of the grid-tied and off-grid solar PV systems using conventional and super-efficient appliances in Dubai is presented. The comparison includes the total power production from the solar PV system, the power purchased from the grid, the extra power sold to the utility grid, the power used to meet the electrical load of the appliances, the excess power, the renewable fraction, the greenhouse gas emissions, and the levelized cost of energy. The results of the simulation show that the integration of super-efficient appliances powered with the grid-tied solar power system is a good option to control the energy consumption of the residential buildings and to reduce the cost of electricity and greenhouse gas emissions: low building energy consumption (reduction by half of the electrical power consumption: from 62.91 to 30.78 kWh/day using super-efficient appliances); all the electrical power demand for the building is met without shortage; the power systems produce low excess power (0.29–1.82%) compared to the off-grid power system; all the extra power from the solar PV is sold back to the grid to reduce the cost of energy, high renewable fraction (68% of the total energy served to the load is produced from solar PV), low-cost of electricity (12% reduction of the cost of energy compared to the utility grid), and low greenhouse gas emissions (45–51% reductions of the CO2, NOX, and SO2 emissions compared to the conventional electrical appliances).
关键词： Grid-tied solar PV,Off-grid solar PV,Super-efficient appliances,Energy efficiency,Renewable energy
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe) - Sarajevo, Bosnia and Herzegovina (2018.10.21-2018.10.25)] 2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe) - Optimization of Anoff-Grid PV System in Respect to the Capacity Shortage Value
摘要： The main goal of this paper is to describe optimization of off-grid PV system in respect to the capacity shortage value remote area in Osijek. The paper shows a model consisting of PV modules, converter, batteries and electrical load. The examined data are based on measured load values for the residential home. Finding an optimal size of off-grid PV system is shown using HOMER software. The investment costs are presented regarding different values of capacity shortage ranging from 0 % to 10 %. This paper also presents the influence of O&M ranging from 0 % to 3 % on the NPC.
关键词： optimization,O&M,HOMER,off-grid PV,Capacity shortage
更新于2025-09-23 15:23:52
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Battery-assisted low-cost hydrogen production from solar energy: Rational target setting for future technology systems
摘要： The massive implementation of renewable energy requires sophisticated assessments considering the combination of feasible technology options. In this study, a techno-economic analysis was conducted for hydrogen production from photovoltaic power generation (PV) utilizing a battery-assisted electrolyzer. The installed capacity of each component technology was optimized for the wide range of unit costs of electricity from the PV, battery, and proton-exchange membrane electrolyzer. Leveling of PV output by battery, the necessary capacity of electrolyzer is suppressed and the operating ratio of electrolyzer increases. The battery-assist will result in a lower hydrogen production cost when the benefit associated with the smaller capacity and higher operation ratio of the electrolyzer exceeds the necessary investment for battery installation. The results from this study indicated the cost of hydrogen as low as 17 to 27 JPY/Nm3 using a combination of technologies and the achievement of ambitious individual cost targets for batteries, PV, and electrolyzers.
关键词： Techno-economic analysis,Technology roadmap,Off-grid production,Proton-exchange membrane electrolyzer
更新于2025-09-23 15:23:52
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Off-Grid Compressive Channel Estimation for mm-Wave Massive MIMO with Hybrid Precoding
摘要： To reduce the pilot overhead and improve the channel estimation accuracy in the massive MIMO system, various channel estimation algorithms employing the sparse signal reconstruction (SSR) scheme have been proposed. However, the spatial grid division leads to the trade-off between the estimation accuracy and the computational complexity. In addition, when the true angle is not on the discretized grid point which is referred as off-grid problem, the performance of SSR-based algorithms will degrade heavily. In this letter, a novel channel estimation algorithm which achieves superior performance under the off-grid scenario is proposed. At first, the conventional joint angle of arrivals/departures (AoAs/AoDs) estimation is transformed into two one-dimensional sub-problems. Then, the SSR-based framework is presented to obtain the initial sparse-support set. By minimizing the constructed objective function, the off-grid errors regarded as adjustable parameters are iteratively refined. In addition, scatter gains are acquired by LSE. Numerical simulations are provided to illustrate the superiority of the proposed algorithm in terms of estimation accuracy and computational complexity.
关键词： channel estimation,millimeter wave,massive MIMO,off-grid refinement,Compressive sensing
更新于2025-09-23 15:23:52
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[IEEE 2018 International Conference on Control, Power, Communication and Computing Technologies (ICCPCCT) - Kannur,Kerala, India (2018.3.23-2018.3.24)] 2018 International Conference on Control, Power, Communication and Computing Technologies (ICCPCCT) - A Brief Study of Solar Home Inverters
摘要： In every field of human development, electricity usage is increasing promptly. Utilization of solar energy is a way to meet the energy demand. The solar inverter is one such device, which makes the solar energy to usable form. In this paper, three major inverters are presented. The voltage source and current source inverters, stand-alone and grid-connected inverters and, square, modified square and sine wave inverters come under the classification. An open loop strategy is considered for the MATLAB Simulation of the three main types of PWM inverters available in the market. A brief description of PV array, charge controller and battery is also presented in this paper.
关键词： Solar Inverter,SPWM,PWM,Off-Grid inverters,Single phase inverters,Power Inverters
更新于2025-09-23 15:22:29
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[IEEE 2018 International Conference on Electrical Engineering and Computer Science (ICECOS) - PANGKAL PINANG, Indonesia (2018.10.2-2018.10.4)] 2018 International Conference on Electrical Engineering and Computer Science (ICECOS) - Techno-Economic Analysis of Sea Floating PV/Diesel Hybrid Power Plant with Battery Arrangement Scheme for Residential Load at Remote Area in Indonesia (Case Study: Small Kei Island, South East Moluccas)
摘要： This study analyses the feasibility of the Sea floating PV (SFPV) system utilization in conjunction with Diesel generator (DG) to supply the resorts at Small Kei Island, Southeast Moluccas, Indonesia. The SFPV system uses off-grid scheme with a specific scenario that is by dividing the battery into three equal parts which are used interchangeably in order to reduce the fluctuation of the output power generated by DG at once to meet the daily load requirement for 24 hours. The impact is the battery charge cycle changed to twice in three days, thus the battery life will increase to 1.5 times longer. In this study, the economic analysis is done with the loan interest of 10% and the operating time for 25 years. With electricity tariff of 1 USD/kWh obtained the most feasible and profitable combination of capacity of DG and SFPV systems is 130 kW and 20 kW respectively. The combination yields the duration of PBP for 9 years 0 months and 9 days, NPV of 36,545 USD, IRR is 11.65%, and PI ratio is 1.016.
关键词： PI,Sea floating PV,PBP,NPV,Off-grid,IRR
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe) - Sarajevo, Bosnia and Herzegovina (2018.10.21-2018.10.25)] 2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe) - Modelling and Evaluating Performance of Large Off-Grid PV Systems for Water Pumping
摘要： This paper discusses modelling of photovoltaic pumping system (PVPS) applications and presents a simple but accurate model for the evaluation of performance of a large-scale multi-pump off-grid PVPS', with single axis solar tracking and variable frequency drive control of pumps. The presented model is validated on an example of an actual 357 kWp 2-pump PVPS installation, demonstrating its use for feasibility and planning studies. The results of a brief economic analysis of the considered off-grid PVPS suggest an estimated 10-year payback period, when compared to the cost of a grid-connected configuration.
关键词： Off-grid supply,water pumping,PV installation
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE PES/IAS PowerAfrica - Cape Town, South Africa (2018.6.28-2018.6.29)] 2018 IEEE PES/IAS PowerAfrica - Design Strategies of an Off-Grid Solar PV Plant for Office Buildings: A Case Study of Johannesburg
摘要： Renewable energy systems based on solar resources are steering the way in grid-connected applications to meet present energy demands. This research work tends to investigate the design and feasibility of RE systems using solar resources to sustain a load in the Office Park building, at Constantia Kloof Roodepoort, Johannesburg, South Africa. This is following the provincial mandate to offset the energy usage of government buildings, including those belonging to the City of Johannesburg, by the installation of renewable energy sources in South Africa. The Cost-Benefit Analysis (CBA) on the design revealed that the fully solar RE system was the most economically possible. This was in comparison with the annual equivalent projected City Power electricity bill for the load profile.
关键词： Johannesburg,Cost-Benefit Analysis,Solar PV,Renewable Energy,Off-Grid
更新于2025-09-23 15:21:01
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[IEEE 2018 International Conference on Electrical Engineering and Computer Science (ICECOS) - PANGKAL PINANG, Indonesia (2018.10.2-2018.10.4)] 2018 International Conference on Electrical Engineering and Computer Science (ICECOS) - Comparative Analysis of Applications Off-Grid PV System and On-Grid PV System for Households in Indonesia
摘要： In Indonesia, about 89.75% of all power stations use fossil fuels, and only 10.25% generation uses renewable energy, i.e., hydropower generation, geothermal power, solar power and wind power. The use of fossil fuels such as coal, oil, and gas will cause environmental degradation. To help reduce environmental degradation requires the use of renewable energy such as solar energy through power plants in large quantities. In this paper will discuss solar power technically and economically, in this case, the cost of generation per kWh for each solar generating scheme is rooftop Off-grid photovoltaic (PV) system and on-grid PV system. Two schemes were created to calculate the generation cost per kWh for off-grid and grid-connected PV systems based on component prices for several cities in Indonesia. Electricity generation cost per kWh for off-grid PV systems and grid-connected PV system are respectively 4,644 IDR/kWh and 1,244 IDR/kWh compared to PLN electricity tariff is 1,467.28 IDR/kWh.
关键词： off-grid PV system,on-grid PV system,Solar Power Plants
更新于2025-09-19 17:15:36
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Disturbance Characteristics of the Off-Grid Photovoltaic System in the Frequency Range from 9 - 150 kHz with Changing Solar Irradiance and Shading Area
摘要： A solar power plant converts light into electricity using photovoltaics. It uses an inverter to convert DC to AC current to be connected to an AC load. Increasing use of solar panels in household application results in an increase in the use of inverters, in which some might due to the fact that inverters can produce disturbances at a frequency between 9-150 kHz. This study is focused on observing the disturbance characteristics of an off-grid photovoltaic system due to variations of irradiation and shading in the frequency range from 9 - 150 kHz. It is expected that the output of this observation can provide a reference for research in determining the effects on electric power system. This observation provided a shading effect of 0%, 25%, 50%, 75%, and 100% of the photovoltaic area and then conducted observation based on two solar irradiation conditions. Based on the observations, it is identified that in general there are 3 frequency ranges of dominant disturbances, they are: 20-25 kHz, 72-73 kHz, and 144-146 kHz. Their voltage disturbance will decrease with increasing shading area, where at shading conditions of 25% and 50% they will have a value voltage disturbance that tends to be the same as that in the 3 dominant frequency ranges.
关键词： disturbance characteristics,off-grid,shading area,photovoltaic system,solar irradiance
更新于2025-09-16 10:30:52