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A concentrating solar power system integrated photovoltaic and mid-temperature solar thermochemical processes
摘要： The approach of cascading solar energy utilization provides access to reliable and ample supplies of energy and has thus attracted widespread attention. Currently, the hybridization of a concentrating solar photovoltaic process and a solar thermochemical process is a promising approach. This paper describes and investigates a concentrating solar power system to harvest solar energy. Co-producing photovoltaic electricity and solar thermal fuel is its attractive distinction. The visible spectrum is cast onto concentrating photovoltaics to generate electricity, and the ultraviolet and infrared spectra are used to drive methanol decomposition at approximately 250 °C. A spectral splitting parabolic trough concentrator is developed in which incident solar radiation is first split and then concentrated. Based on the measured optical data of concentrators, photovoltaics and reactor, the solar-to-electricity performance is evaluated in the proposed system. The results show that a satisfied solar-to-electricity efficiency of approximately 31.8% would be realized if monocrystalline silicon photovoltaics is adopted. In comparison to individual systems, the efficiency enhancements of about 15.3% and 6.3% are obtained. The solar-to-electricity efficiency can reach approximately 35.1% by adopting gallium arsenide. Meanwhile, the improved optical performance proves that the approach of first splitting and then concentrating sunlight is feasible and promising. Finally, the results are anticipated to lead to a new approach for improving full-spectrum solar energy utilization and guiding the establishment of a prototype in the near future.
关键词： Full spectrum,Cascading solar energy utilization,Photovoltaic electricity,Concentrating solar power system,Solar thermal fuel
更新于2025-09-16 10:30:52
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Manufacturing of a parabolic trough concentrating collector test rig and a “LASER-Screen” technique for measuring actual focal length and light interceptance of the collector
摘要： A portable parabolic trough-concentrating solar collector test rig was designed, and fabricated using locally available materials and technique. A trough made of any materials and the energy collection element of any geometry with maximum aperture area of 80×100cm2 and 2.5×100cm2 respectively can be fitted readily in the support structure of the rig. A two-axis manual tracking system allows the rig to track the sun daily from east to west for every 5° interval, and seasonally from 50°North to 80°South for every 15°. In addition to this, actual focal length and light interceptance were investigated applying customised “LASER-Screen” technique. An average light interceptance of the rig for a 2.5 cm diameter absorber tube was measured to be 85.9%. The focal length of the 100 cm long test rig was found to be 18.167±1.35cm. The test rig will facilitate to investigate the energy potential in Chittagong region of Bangladesh.
关键词： parabolic profile accuracy,concentrating solar power,slope error measurement,LASER-Screen technique,Parabolic trough concentrating collector
更新于2025-09-12 10:27:22
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Small scale solar tower coupled with micro gas turbine
摘要： This paper studies a small-scale CSP system composed of a solar tower and a recuperative air micro gas turbine (i.e. net power in the 100e200 kWe range). A code is developed to determine the optical performance of the heliostat field coupled with a secondary concentrator, while another code computes the thermal engine performance. The 832 m2 heliostat field layout is taken from a real plant, while the secondary optics is studied to maximize the optical-thermal efficiency. The selected secondary concentrator (CPC), with an aperture diameter of 0.5 m and an acceptance angle of 35(cid:1) tilted of 52.5(cid:1), guarantees an overall optical efficiency of 77.9% in design conditions (Spring equinox, solar noon) and of 66.9% on yearly basis. For every Effective DNI (EDNI) and ambient temperature the turbine operation is optimized allowing to achieve a yearly solar-to-electricity efficiency of 16.3%. Summing up the cost of each component, an overall plant cost of about 2300 V/kW (peak) and a LCOE of 175 V/MWh are obtained. A sensitivity analysis on design EDNI, impacting on turbine size, is performed showing that its reduction from 700 W/m2 to 550 W/m2 allows reducing the LCOE down to 158 V/MWh, a value competitive with large-scale solar towers. The possibility of hybridization of plant (i.e. improving the gas turbine power output in selected hours, by means of biomethane or natural gas combustion) was considered to further reduce the LCOE.
关键词： Concentrating solar power,Solar energy,Compound parabolic concentrator,Heliostat field,Solar power tower,Micro gas turbine
更新于2025-09-11 14:15:04
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Dispatch optimization of concentrating solar power with utility-scale photovoltaics
摘要： Concentrating solar power (CSP) tower technologies capture thermal radiation from the sun utilizing a field of solar-tracking heliostats. When paired with inexpensive thermal energy storage (TES), CSP technologies can dispatch electricity during peak-market-priced hours, day or night. The cost of utility-scale photovoltaic (PV) systems has dropped significantly in the last decade, resulting in inexpensive energy production during daylight hours. The hybridization of PV and CSP with TES systems has the potential to provide continuous and stable energy production at a lower cost than a PV or CSP system alone. Hybrid systems are gaining popularity in international markets as a means to increase renewable energy portfolios across the world. Historically, CSP-PV hybrid systems have been evaluated using either monthly averages of hourly PV production or scheduling algorithms that neglect the time-of-production value of electricity in the market. To more accurately evaluate a CSP-PV-battery hybrid design, we develop a profit-maximizing mixed-integer linear program (H) that determines a dispatch schedule for the individual sub-systems with a sub-hourly time fidelity. We present the mathematical formulation of such a model and show that it is computationally expensive to solve. To improve model tractability and reduce solution times, we offer techniques that: (1) reduce the problem size, (2) tighten the linear programming relaxation of (H) via reformulation and the introduction of cuts, and (3) implement an optimization-based heuristic (that can yield initial feasible solutions for (H) and, at any rate, yields near-optimal solutions). Applying these solution techniques results in a 79% improvement in solve time, on average, for our 48-h instances of (H); corresponding solution times for an annual model run decrease by as much as 93%, where such a run consists of solving 365 instances of (H), retaining only the first 24 h’ worth of the solution, and sliding the time window forward 24 h. We present annual system metrics for two locations and two markets that inform design practices for hybrid systems and lay the groundwork for a more exhaustive policy analysis. A comparison of alternative hybrid systems to the CSP-only system demonstrates that hybrid models can almost double capacity factors while resulting in a 30% improvement related to various economic metrics.
关键词： Grid integration,CSP-PV hybrid systems,Mixed-integer linear programming (MILP),System analysis,Photovoltaics (PV),Concentrating solar power (CSP),Dispatch optimization,Lithium-ion battery
更新于2025-09-11 14:15:04
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Mitigation Strategy for Duck Curve in High Photovoltaic Penetration Power System Using Concentrating Solar Power Station
摘要： Concentrating solar power (CSP) station is counted as a promising ?exible power supply when the net load power curve is duck-shaped in high photovoltaic (PV) penetration power system, which may lead to the serious phenomenon of PV curtailment and a large-capacity power shortage. This paper presents a mitigation strategy that replaces thermal power station with CSP station to participate in the optimal operation of power system for solving the duck-shaped net load power curve problem. The proposed strategy utilizes the dispatchability of thermal storage system (TSS) and the fast output regulation of unit in the CSP station. Simultaneously, considering the operation constraints of CSP station and network security constraints of the system, an optimization model is developed to minimize the overall cost including operation and penalty. The results obtained by nonlinear optimization function demonstrate that the replacement of concentrating solar power (CSP) station contributes to reducing the PV curtailment and lost load, while increasing the available equivalent slope for power balance. Thus, the proposed mitigation strategy can promote the penetration of PV generation and improve the ?exibility of power system.
关键词： regulation capability,concentrating solar power (CSP) station,duck curve,operation mode,photovoltaic (PV) penetration
更新于2025-09-11 14:15:04
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and above: Experiments and modeling in the optically-thick regime
摘要： This work presents the exploratory experimental results of a co-located solar receiver and thermal energy storage (TES) concept based on a pool of molten glass contained in a cavity, serving as solar receiver and TES medium simultaneously. Distinctive features of the system are the direct and volumetric absorption of solar radiation by the semi-transparent glass and a stationary TES medium. Only the charge cycle was studied, without a heat-removal system. Recycled soda-lime-silica (SLS) container glass of various colors was adopted as working medium in a setup tested at the ETH’s High Flux Solar Simulator (HFSS). A steady 3D heat transfer model of the experimental apparatus, which couples Monte-Carlo ray-tracing and CFD techniques, was developed and validated against the experimental results. The tests used the HFSS as the only energy source, with maximum radiative fluxes of 1.2 MWm?2 and power input of 1.5 kW directly absorbed by the glass, which reached measured temperatures of 1300 °C, while the maximum temperatures –as predicted by the model– exceeded 1500 °C. Such conditions were maintained for 5 to 10 h and no technical problems were encountered with the containment of the hot glass melt. These preliminary results demonstrate that silicate glasses are effective volumetric absorbers of solar radiation up to temperatures exceeding 1300 °C.
关键词： Concentrating Solar Power (CSP),Glass,Thermal Energy Storage (TES),GLASUNTES
更新于2025-09-09 09:28:46
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Study on the general system integration optimization method of the solar aided coal-fired power generation system
摘要： Solar aided coal-fired power generation (SAPG) has been attracted more and more attentions in recent years. However, its integration and optimization is a rather challenging work. Most of the studies are based on the researches of one or several certain schemes, and no general system integration optimization method (GIOM) considering all possibilities has been proposed. In this paper, a general system integration optimization model is developed, which is configured with 8 virtual molten salt heat exchangers (FHms) and used to simulate any scheme of different integration locations and heat distributions. A SAPG system based on Solar Two plant and a 600 MWe supercritical coal-fired plant is studied. The results show that at the relatively higher heliostat field power (HFP) work conditions, the heat energy should be injected into the highest pressure feedwater heater (FHs) as a priority. While at the relatively lower HFP and higher turbine power work conditions, the heat should be distributed to the two highest pressure FHs in a certain proportion instead of fully distributed to the highest pressure FHs. The performances of both the receiver and the power block are improved. The solar-electric conversion efficiency of SAPG system is obviously higher than that of Solar Two.
关键词： Optimal integration scheme,Solar aided power generation,Concentrating solar power,Integration system optimization,Coal-fired power plant
更新于2025-09-04 15:30:14
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AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Techno-economic analysis of a central receiver power plant with different levels of storage capacity and hybridization
摘要： The energy storage and fossil-backup (fossil-hybridization) systems of a concentrating solar power plant (CSP) provide a continuous production of energy all over the year and satisfy the grid demand even when the sun is not shining. One could ask about the behavior of the energy production, or the levelized energy cost, as a function of the energy storage and of the fossil-hybridization in such plants. This paper tries to answer this question. For this task, there have been performed numerous simulations on a central receiver plant with a fixed nominal power, varying the storage capacity and the level of hybridization. The results showed that these variables impact differently. For the thermal storage, from capacities ranging from 0h to 24h, there is a specific intermediary capacity, 15h, in which the levelized energy cost is minimum. But for the fossil-hybridization, this energy cost always decreases with the increment of the hybrid level. The results also showed that, if a given energy production is supported by a certain level of hybridization, its energy cost would be less than that supported by a storage system. This is due to the relatively high investment costs related to the storage system, and the relatively low cost of fuel.
关键词： Concentrating Solar Power (CSP),Central Receiver (CR),Thermal Energy Storage (TES),Fossil-hybridization (HYB),Levelized Cost of Energy (LCOE)
更新于2025-09-04 15:30:14