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Husein, Munir,Hau, Vu Ba,Chung, Il-Yop,Chae, Woo-Kyu,Lee, Hak-Ju The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.5
This paper presents the design and dynamic analysis of a stand-alone microgrid with high penetration of renewable energy. The optimal sizing of various components in the microgrid is obtained considering two objectives: minimization of levelized cost of energy (LCOE) and maximization of renewable energy penetration. Integrating high renewable energy in stand-alone microgrid requires special considerations to assure stable dynamic performance, we therefore develop voltage and frequency control method by coordinating Battery Energy Storage System (BESS) and diesel generators. This approach was applied to the design and development of Gasa Island microgrid in South Korea. The microgrid consists of photovoltaic panels, wind turbines, lithium-ion batteries and diesel generators. The dynamic performance of the microgrid during different load and weather variations is verified by simulation studies. Results from the real microgrid were then presented and discussed. Our approach to the design and control of microgrid will offer some lessons in future microgrid design.
Husein, Munir,Chung, Il-Yop Elsevier 2018 APPLIED ENERGY Vol.225 No.-
<P><B>Abstract</B></P> <P>Microgrids are gradually being recognized as an important option for sustainable and reliable energy, especially in university and military campuses. In this paper, we investigate the technical and financial feasibility of deploying a microgrid in a university campus. We consider various incentives such as renewable energy investment-based incentives, tax benefits, and grid ancillary services. In this study, we developed a microgrid planning model, called Microgrid Decision Support Tool (MDSTool). The model is structured into two sub-models—performance and economic models. Performance model simulates the optimal operation of the microgrid and is used to analyze energy usage and investigate technical feasibility. The economic model calculates all the system cash flows, its purpose is to determine the optimal sizing of distributed energy resources and financial feasibility. The overall model is used to design a campus microgrid at Seoul National University, South Korea. The results show that renewable energy incentives, tax benefits, and grid ancillary services influence both the financial feasibility and renewable energy penetration in a microgrid.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Microgrid decision support model is developed. </LI> <LI> Incentives, tax benefits, and grid ancillary services are considered in the model. </LI> <LI> Incentives, tax benefits, and grid ancillary services affect both optimal sizing and financial feasibility. </LI> <LI> Optimal microgrid was found to decrease energy cost by 42% and emissions by 15%. </LI> </UL> </P>
Husein, Mustafa Q.,Kridli, Rami T. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.9
The objective was to identify the appropriate form of progesterone, which exhibits compact reproductive responses in Awassi ewes during mid to late seasonal anestrous period. Forty-eight Awassi ewes were randomly allocated into four groups to be treated with 60 mg medroxyprogesterone acetate (MAP), 30 mg fluorogestone acetate (FGA), 40 mg FGA, or 600 mg progesterone sponges. After a 12 day period, sponges were removed and ewes were administered i.m. with 600 IU PMSG (d 0, 0 h). Five harnessed Awassi rams were turned-in with the ewes to detect heat. Ewes were checked for breeding marks at 6 h intervals for 5 days. Blood samples were collected from all ewes for analysis of progesterone concentrations. Pretreatment (d -13 and -12) progesterone concentrations were ${\leq}0.2ng/mL$ among all ewes and were indicative of seasonal anestrous period. On d 0, progesterone concentrations were elevated to $1.4{\pm}0.1ng/mL$ in ewes received progesterone sponges only and were higher (p<0.0001) than those (${\leq}0.2ng/mL$) administered MAP or FGA sponges. Progesterone concentrations returned to their basal values of <0.2 ng/mL within 24 h of sponge removal and were similar (p>0.1) among all ewes. Incidence of estrus was similar (p>0.1) among the four groups and occurred in 75% (9/12), 82% (9/11), 67% (8/12) and 58% (7/12) of the ewes receiving MAP, 30 mg FGA, 40 mg FGA and progesterone sponges, respectively. Estrous responses occurred 14.7, 20 and 13.6 h earlier in progesterone-sponge-treated ewes than those of MAP- (p<0.04), 30 mg FGA- (p<0.01) and 40 mg FGA-treated (p=0.06) ewes, respectively. Induced estrus conception rates were 50% (6/12), 55% (6/11), 50% (6/12) and 42% (5/12), out of which 4/6, 4/6, 3/6 and 3/5 lambed 151 days following d 0, and were similar (p>0.1) among ewes of the four treatment groups. Ewes that returned to estrus 16 to 20 days following d 0 were 5/12, 5/11, 6/12 and 4/12 ewes treated with MAP, 30 mg FGA, 40 mg FGA and progesterone sponges, respectively, and all lambed 169 days later. Overall lambing rates were 75% (9/12), 82% (9/11), 75% (9/12) and 58% (7/12) ewes treated with MAP, 30 mg FGA, 40 mg FGA and progesterone sponges, respectively. Results demonstrate that applications of MAP, 30 mg FGA, 40 mg FGA and progesterone sponges Awassi ewes were equally effective in induction of estrus and tended to favor both types of FGA and MAP in overall lambing rates over progesterone sponges during the seasonal anestrous period.
Design and Dynamic Performance Analysis of a Stand-alone Microgrid
Munir Husein,Vu Ba Hau,Il-Yop Chung,Woo-Kyu Chae,Hak-Ju Lee 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.5
This paper presents the design and dynamic analysis of a stand-alone microgrid with high penetration of renewable energy. The optimal sizing of various components in the microgrid is obtained considering two objectives: minimization of levelized cost of energy (LCOE) and maximization of renewable energy penetration. Integrating high renewable energy in stand-alone microgrid requires special considerations to assure stable dynamic performance, we therefore develop voltage and frequency control method by coordinating Battery Energy Storage System (BESS) and diesel generators. This approach was applied to the design and development of Gasa Island microgrid in South Korea. The microgrid consists of photovoltaic panels, wind turbines, lithium-ion batteries and diesel generators. The dynamic performance of the microgrid during different load and weather variations is verified by simulation studies. Results from the real microgrid were then presented and discussed. Our approach to the design and control of microgrid will offer some lessons in future microgrid design.