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1.

Optimal Scheduling Power Generations Using HSABC Algorithm Considered A New Penalty Factor Approach

A.N. Afandi [Kumamoto University, Universitas Negeri Malang] (17 records)

Abstract
Scheduling power generations are very important in power system operations to meet various combinations of generating units for providing electric energy in order to operate more economically for supplying power demands. This strategy is able to cover using a combined economic and emission dispatch (CEED) considered pollutant emission and fuel consumption aspects under operational constraints for optimizing the total operating cost. The pollutant production is embedded in the CEED using a penalty factor to become the same priority cost function. This paper introduces a new penalty factor approach for combining emission and economic dispatches solved using the latest intelligent computation. Results obtained on IEEE-62 bus system show different performances of previous and new penalty factor approaches. Moreover, the CEED is carried out in the similar result for the total power output. The time consumption, operating cost, and speed of the new approach are less than one others while obtaining the optimal solution.

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2.

HSABC Algorithm for Searching the Optimal Solution of CEED Problem Considering Uncontrolled Distance Placements

A.N. Afandi [Kumamoto University, Universitas Negeri Malang] (17 records)

Abstract
An economic power system operation is able to approach using a total operating cost of generating units. Technically, this problem is presented by a combined economic and emission dispatch (CEED) due to a total load demand. This paper presents performances of a novel intelligent computation, harvest season artificial bee colony (HSABC) algorithm, for obtaining the optimal solution of the CEED problem. Simulation results used IEEE-62 bus system show that HSABC has a smooth convergence and applicability for solving the CEED problem.

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3.

The New Opportunity for Carrying Out a Dynamic Economic Dispatch using the Latest Evolutionary Computation Method

A.N. Afandi [Kumamoto University, Universitas Negeri Malang] (17 records)

Abstract
Practically, a power system is operated by combined various types of generating units for determining a committed power schedule to meet load demand changes at all period times of the operation in order to reach the most economical operation. The committed power schedule of generating units is obtained by allocating power outputs based on the given load demand at a certain period time for minimizing the total cost considered some constraints. The total cost changes of operation are expressed by dynamic economic dispatch (DED) problems with considering load demand changes for each period time of the operation. In this paper, the harvest season artificial bee colony (HSABC) algorithm is used to solve the DED problem for 24 hours of operating times using IEEE-30 bus system. Simulation results show thatthe best solution of the problem is obtained by HSABC within theshortest iteration step. The computations used load demand changes for all period times are quick and smooth with stable characteristics of convergences. The DED problem is solved using HSABC in different convergence speeds, power outputs and total operating costs for 24 hours.

Full article

 
4.

Transient Stability Evaluation of the Power Generation under a Blackout Condition based on the Branch Tripping Scenario

A.N. Afandi [Kumamoto University, Universitas Negeri Malang] (17 records)

Abstract
An operational condition of a power system is able to affect to stability performances after disturbed by a certain fault on the interconnection system. Moreover, this fault also gives impact to the blackout situation created by a large disturbance as disconnecting back bone lines of the interconnection system. In detail, this case is presented in this paper for evaluating transient stability performances of generating units while producing energy for the load center online the power system operation with the blackout situation designed using a branch tripping method. Furthermore, the transient stability responses are subjected to the power generation of the electric power system in Malang Raya as a real system operation for interacting the generating and demand sites. Results obtained show that voltage changes of Wlingi power station is 0.944 pu to 0.946 pu and its overshoot is 0,962. But the other overshoot of the power generation in Sutami remained to 0.968 pu at 0.5 second after appearing a blackout fault and its voltage increase to 0.952 pu from 0.948 pu at the final stable position.

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5.

Optimal Solution of the EPED Problem Considering Space Areas of HSABC on the Power System Operation

A.N. Afandi [Kumamoto University, Universitas Negeri Malang] (17 records)

Abstract
Recently, the emission problem and economic dispatch (EPED) becomes crucial aspects in the power system operation. These aspects are measured technically using financial payments as the total operating cost based on pollutant productions and fuel consumptions throughout individual costs of generating units based on a committed power output to meet a load demand. This paper introduces the newest artificial intelligent computation, harvest season artificial bee colony (HSABC) algorithm, for determining the optimal solution of the EPED based on the operating cost function using IEEE-62 bus system with various operational constraints. Results obtained show that HSABC has short time computations and fast convergences while space areas give different implications on performances. The optimal solution produces various individual power outputs, pollutants, and costs.

Full article

 
6.

Flexible Cu(In,Ga)Se2 solar cells fabricated using a polyimide-coated soda-lime glass substrate

Adiyudha Sadono, Masashi Hino, Mitsuru Ichikawa, Kenji Yamamoto, Yasuyoshi Kurokawa, Makoto Konagai, and Akira Yamada
Japanese Journal of Applied Physics (2015)

Adiyudha Sadono (1 records)

Abstract
Flexible solar cells with a Cu(In,Ga)Se2 (CIGS) absorber layer were fabricated on a polyimide thin film using a lift-off process. Polyimide-coated soda-lime glass (SLG) was used as a substrate for fabricating CIGS solar cells before the lift-off process conducted to make the cells flexible. A conversion efficiency of 13.4% was achieved by low temperature deposition; this value is comparable to that obtained by direct deposition on a rigid glass substrate even without an external Na source. The final conversion efficiency after the lift-off process was 12.7% with some area correction due to the partial peeling-off between CIGS and Mo. Open-circuit voltage and fill factor did not change before and after the lift-off process, suggesting that the lift-off process did not give any physical damage.

Full article

 
7.

Plutonium Utilization in FUJI-U1 Molten Salt Reactor

Cici Wulandari, Indarta Kuncoro Aji, Syeilendra Pramuditya, Sidik Permana, and Abdul Waris*
The 6th Asian Physics Symposium (2015)

Syeilendra Pramuditya (11 records)

Abstract
Molten salt reactor (MSR) design has been elected as one of the Generation IV nuclear energy systems, since it has many advantages such as safety improvement, proliferation resistance, resource sustainability, and ability to be used for hydrogen production. MSR has no chance for high power surges due to online refueling and small excess reactivity, which in turn enhances the safety aspect of MSR. Natural Thorium (232Th) can undergo the radiative capture reaction to generate the artificial fissile nuclide 233U after successive beta decays. Thorium - 233U fuel cycle will produce 232U, a 2.6 MeV gamma emmiter. These later two aspects provide the resource sustainability and the proliferation resistance advantages of MSR. FUJI-U1 is an MSR with 450 MWth of power output and 44.4% of thermal efficiency. The basic design of FUJI-U1 reactor utilizes ThF4-UF4 as a fuel composition. In this study, ThF4-PuF4 will be used instead of ThF4-UF4. SRAC 2006 code with JENDL 3.3 will be employed in the neutronics calculation.

Full article

 
8.

LiF4-ThF4-PuF4 Utilization as Fuel Salt of miniFUJI Molten Salt Reactor

Abdul Waris*, Indarta Kuncoro Aji, Syeilendra Pramuditya, and Dwi Irwanto
The 6th Asian Physics Symposium (2015)

Syeilendra Pramuditya (11 records)

Abstract
Molten salt reactor (MSR) is one of the Generation IV nuclear energy systems. Recently, a thorium molten salt nuclear energy synergetic (THORIMS-NES) concept has being proposed for the sustainable and safe nuclear industry. The THORIMS-NES concept consists of three stages. The building of the miniFUJI reactor, a small 10 MWe power reactor that may be developed during 7 years is the initial stage. The second stage is the construction of the 100-300 MWe FUJI reactors, a thorium molten salt reactor planned to go online in 12-14 years. The setting up of regional breeding and chemical processing centers with production of 233U by thorium spallation in AMSB (accelerator molten salt breeder) is the final stage The original miniFUJI reactor design uses LiF-BeF2-ThF4-UF4 as a fuel salt. In the present study, the use of LiF4-ThF4-PuF4 a fuel salt instead of LiF-BeF2-ThF4-UF4 will be discussed. Several preliminary results will be presented in the full paper and also during the conference.

Full article

 
9.

Hydrothermal Treatment of Oil Palm Empty Fruit Bunch to Produce Green Solid Fuel

Pandji Prawisudha, Achmad Rofi Irsyad, Srikandi Novianti, Kunio Yoshikawa, Ari Darmawan Pasek
The 2nd AUN-Seed NET Regional Conference on Energy Engineering 2014 (2014)

Srikandi Novianti (3 records)

Abstract
Oil palm is mainly grown in Southeast Asia, with Indonesia alone has 6 million hectares of oil palm plantation, and another 4 million by 2015 planned for biofuel production. This condition will produce massive amount of oil palms Empty Fruit Bunch (EFB), accounted for one-third of the Fresh Fruit Bunch (FFB) yield in weight, which can be used as carbon-neutral solid fuel. The usage of the EFB, however, is hindered by its bulky size, high moisture content and considerable amount of unwanted impurities such as potassium, responsible for slagging and fouling in the furnace. In this research, medium temperature hydrothermal process was used to upgrade the characteristic of EFB as solid fuel. Fresh and shredded EFB was processed in 2.5 L reactor, injected with saturated steam at moderate processing temperature of 150 to 200 C and 30 min holding period. Subsequent liquid-solid separation process was conducted to observe the remaining potassium in the solid product. Physical composition, heating value and remaining potassium content in the solid product was measured afterwards. The process yielded brittle, granular product similar to carbonized biomass. The highest fixed carbon content as solid fuel quality indicator was found at 200 C processing temperature with doubled fixed carbon content to that of EFB, while up to 77 % potassium reduction was observed at only 150 C processing temperature. It can be concluded that the combination of hydrothermal process and liquid-solid separation in optimum temperature will produce a carbon-neutral, potassium-free solid fuel suitable for conventional solid fuel furnace.

Full article

 
10.

Upgrading of Palm Oil Empty Fruit Bunch Employing Hydrothermal Treatment in Lab-scale and Pilot Scale

Srikandi Novianti, MK Biddinika, Pandji Prawisudha, Kunio Yoshikawa
Procedia of Environmental Science (2014)

Srikandi Novianti (3 records)

Abstract
In this research, the hydrothermal treatment (HT) was applied to treat a waste stream from the commercial production of palm oil. The investigation both lab-scale and pilot-scale reactors have been conducted. The hydrothermal products were characterized and their fuel qualities were evaluated. The results indicated that the fuel qualities of the products improved after HT; such as higher carbon content, higher energy density, and lower O/C and H/C ratios compared with the raw feedstock. The HT products derived from the lab-scale and pilot-scale reactors had similar chemical compositions and energy density which indicated the feasibility of an up-scale application for this technology.

Full article

 

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