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Study on Operational Optimization of a Combined Energy System with Photovoltaic Power GenerationStudy on Operational Optimization of a Combined Energy System with Photovoltaic Power Generation
太陽光発電を伴う複合エネルギーシステムの運用最適化に関する研究 |
"/ABEER, GALAL EL-SAYED SAAD/"ABEER, GALAL EL-SAYED SAAD ,
"/アビール, サード/"アビール, サード
内容記述
This thesis optimizes the operation planning of a photovoltaic system with a dieselengine generator or a combined fuel cell. The proposal systems allow for theconstruction of a power supply system with low environmental impact that usesrenewable energy. The production of electricity from the photovoltaic system (PV)continues to attract interest as a power source for distributed energy generation. It isimportant to be able to estimate a photovoltaic power to optimize system energymanagement. The neural network has been proposed as suitable for statisticalapproaches for classifications and prediction problems. A layered neural network ismade to learn and teach based on the weather data of amount of solar radiation andoutside air temperature. Fuel cell power generation is another attractive option forproviding power for electric utilities and commercial buildings because of its highefficiency and environmentally benign feature. The fuel cells have recently been thefocus of great interest as a distributed generation technology. The solid-oxide fuelcell (SOFC) and a proton-exchange membrane fuel cell (PEFC) are two types of fuelcells and particularly suitable for distributed power generation and cogenerationsystems. Moreover, energy supply characteristics of a PV and a diesel enginegenerator combined system are studied. Two operating cases are examined in thissystem: one with and one without a power storage facility. The operation of thediesel engine generator is based on the fluctuation of the load in the operation ofCase 1, and a battery is not used. Therefore, because the engine is operated over awide area from a low to a high load, the average engine operation efficiency is low.On the other hand, in the operation of Case 2, a battery is used to supply the demandwhen the PV power generation is less than the demand, and the diesel enginegenerator operates at 25% or less of the battery residual quantity to work in safetymode in the proposed system. Furthermore, operation of the engine generator isbased on the charge or discharge of the battery, with maximum engine efficiency atmaximum output power. Comparisons are presented of the results from the two caseswith respect to the actual calculations of output power and the predicted electricityproduction from the photovoltaic system. Energy is supplied to a demand side ofthree households in Sapporo city, Japan from the proposed system, and no externalsources are used. The analysis error of the operation prediction is considered.A photovoltaic and SOFC-PEFC combined system is developed in this study. Theproposed system consists of a SOFC-PEFC combined system and a PV as the energysupply to a micro-grid of 30 residences in Sapporo, Japan. The operation plan of thesystem has three cases: without solar power, with 50% and with 100% of solaroutput power. Furthermore, three types of system operation of using the SOFCindependent operation, PEFC independent operation and SOFC-PEFC combinedsystem are used to supply the demand side. A comparative study between the typesof system operation is presented. The power generation efficiency is investigated for different load patterns: average load pattern, compressed load pattern and extendedload pattern.The operation results the PV and the diesel engine combined system shows that,when the NN production-of-electricity prediction is introduced, the engine generatoroperating time is reduced by 12.5% in December and 16.7% for March andSeptember. The engine generator operation time is shortened by introducing a NNprediction algorithm. Furthermore, the operation results of the PV and SOFC-PEFCcombined system show that, the difference between the SOFC independent systemand the PEFC independent system is small. The fuel consumption of the SOFCPEFCcombined system is reduced 10 to 35% compared with the SOFC or PEFCsystems independently. The power generation efficiency of the SOFC-PEFCcombined system considering the three load patterns of the proposed system is 27%to 48%. When photovoltaic generation is not introduced into the SOFC-PEFCcombined system, the change in the power generation efficiency is small.Considering all the results of this thesis, it is found that the optimized operation ofan energy system with a PV power generation reduced the time operation of thediesel engine generator and the energy cost of the proposal systems. In addition, theproposed energy systems with a PV power generation are proved to be effective toachieve the purpose supplying energy to a micro-grid with good performancewithout any external source.
北見工業大学,博士(工学),甲第109号,00005454180
本文を読む
https://kitir.lib.kitami-it.ac.jp/dspace/bitstream/10213/1763/1/%e3%82%a2%e3%83%93%e3%83%bc%e3%83%ab.pdf
