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Control method for the stable operation of distributed inverters following the introduction of large-scale renewable energy to a remote island grid

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Clean Energy 2021年第2期5卷 196-207页

作者： Shoichi Sato Yasuhiro Noro Department of Electrical and Electronic Engineering Kogakuin University1-24-2 Nishi-ShinjukuShinjuku-kuTokyo 163-8677Japan

The introduction of large-scale renewable energy requires a control system that can operate multiple distributed inverters in a stable way.This study proposes an inverter control method that uses information corresponding to the inertia of the synchronous generator to coordinate the operation of battery energy storage systems.Simulation results for a system with multiple inverters applying the control method are presented.Various faults such as line-to-line short circuits and three-phase line-to-ground faults were simulated.Two fault points with different characteristics were compared.The voltage,frequency and active power quickly returned to their steady-state values after the fault was eliminated.From the obtained simulation results,it was verified that our control method can be operated stably against various faults.

关键词： renewable energy photovoltaic battery energy storage system inverter remote island

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Identifying fish assemblages in tropical lagoon ecosystem:First record from Luang island,South-west Maluku Indonesia

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Aquaculture and Fisheries 2023年第2期8卷 221-226页

作者： B.G.Hutubessy Jacobus W.Mosse Department of Fisheries Resource Utilization Pattimura UniversityJl.Mr.Chr.SoplanitKampus PokaAmbon97233Indonesia Department of Aquaculture Pattimura UniversityJl.Mr.Chr.SoplanitKampus PokaAmbon97233Indonesia

The aim of this study was to record demersal species from lagoon in Luang island,a small and remote island in Maluku,Indonesia.Quantitative and qualitative methods were employed with the assistance of the local fishers using 4 different methods of fishing:gillnets,spear guns,traps,and handlines.Fisher knowledge informed fish abundance and frequency of occurrence.A total of 348 individual fish distributed across 53 species were recorded from the catch of 4 gear types.Bray-Curtis similarity scores of fish assemblages at different habitats was ranged from 7.19%to 10.35%.The nMDS bi-plot visualized a distinct dimension with which to allocate 3 habitats separately from the sand-seagrass habitat.Significant similarity of species at 4 different habitats(ANOSIM R^(2)=0.124,P=0.002)suggested that the habitat parameter was not able to predict different communities of fish.This paper is the first contribution on the composition of lagoon ichthyofaunal in Southwest Maluku Regency.Wise attitude towards marine resource exploitation such as traditional conservation,less fishing pressure and marine culture will maintain the healthy ichthyofaunal assemblages in a tropical lagoon ecosystem.

关键词： Species composition remote island Unstudied area Fishers’knowledge

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Use of hydrogen storage in an off-grid system for implementing a renewable-energy system

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Clean Energy 2021年第4期5卷 704-712页

作者： Yasuhiro Noro Satoshi Uchiyama Department of Electrical and Electronic Engineering Kogakuin UniversityTokyoJapan

This paper presents the purpose,advantages,system constitution,operation method and estimation results of using hydrogen storage in a small-scale electric power(off-grid)system when renewable energy sources are introduced.It is assumed that all electricity is supplied from renewable energy sources without using a diesel generator that requires fossil fuels.In other words,for a small-scale electric power system on a remote island,a power-supply system comprising a photovoltaic power-generation system,storage battery,hydrogen-production system,storage tank and a fuel cell is considered.The condition under which the total construction cost is minimized by considering the equipment capacity,operation method of the battery and fuel cell as parameters is investigated.The results demonstrate that the construction cost can be reduced by applying the method of surplus magnification and hydrogen storage.The initial cost is~70%when hydrogen storage is added as compared with the case in which a storage battery alone is used.Such a cost-effective system can contribute to Japan’s self-reliance with regard to the energy sector in the future.

关键词： hydrogen storage storage battery fuel cell photovoltaic generation off-grid remote island

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