bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sedimentation and Longshore Current Simulation with Delft3D Software in Rejoso Shoreline
Authors: Rakhmawati A L 
Published: March 2021

Abstract
Rejoso estuary, located 3 kilometers from the center of Pasuruan, has an unstable river mouth that threatens the existence of residents in the surrounding area. During the rainy season, when high discharge in the river meets high tide from the ocean, flooding occured in residential areas located around the coast. It happens due to sediment deposits formed near the sea and ocean current that worsen the backwater. East Java Provincial Water Resources Agency plans to build a jetty in that area to reduce sediment deposition caused by longshore sediment transport and to protect the estuary from ocean currents. This study aims to look at the impact of jetty construction that is affected by wave and current activity by performing numerical modeling with Delft3D software. From the simulation results, jetty reduce the amount of ocean current with the biggest reduction at monitoring point A is 0.299 m/sec (94.05%) and decrease sedimentation with the biggest at monitoring point A by 91.37% in the east side of the estuary. In conditions without a jetty, the shape of the shoreline and the elevation follows the shape of the initial shoreline, while after one year with jetty the sedimentation occurred to the end of it.
Hydrodynamics Performance Analysis of Vertical Axis Water Turbine (VAWT) Gorlov Type Using Computational Fluid Dynamics (CFD) Approach
Authors: Wardhana W , Keniraras N , Pratama R S , Rahmawati S 
Published: March 2021

Abstract
The Renewable Energy conversion technology has been increasingly developed along with the awareness regarding the negative environmental issues caused by Non-renewable Energy waste. Vertical Axis Water Turbine (VAWT) is an interesting research object because of variety of advantages it offers. The Gorlov type VAWT is famous for its tendency to move regardless the water flow directions and able to rotate twice as fast as the inlet velocity. Things which need to consider important related to the turbine hydrodynamic effects including the quantity of blades, hydrofoil profiles, pitch angle, and turbine’s dimension ratio. In this study, numerous variations were applied to determine the hydrodynamic effects caused especially torque output. Investigations were carried out using Computational Fluid Dynamics (CFD) simulations. The Gorlov type turbine model is simulated in 3D under steady state flow conditions. The software used to run numerical simulations is ANSYS V18.1. The flow model used is laminar according to secondary data analysis. After the numerical simulation results are obtained, validation is performed with an average error rate of less than 10%. Variations chosen in this study is the pitch angle of 40° and 30 °, the dimension ratio in the form of 450 mm in diameter, the type of asymmetrical hydrofoil (S1210), and the quantity of blades (2, 3, 4, 5, and 6). Simulation results in the form of torque values showed that the best turbine performance is provided by NACA 0012 symmetrical hydrofoil with 40° pitch angle.
Monte Carlo Simulation for Reliability Hydraulic Stability of Rubble Mound Breakwater Armour at Sudimoro Power Plant, Pacitan
Authors: Armono H D , Nugroho D K , Mukhtasor and 
Published: March 2021

Abstract
In breakwater design, the conventional deterministic methods are commonly used. This method based on the concept of load, where the design load should not exceed the carrying capacity of the structure. However, the design load itself can be identified using statistics analysis, such as the average value of a 60-years return period of wave. Most of the available design formulas only provide a link between wave characteristics and some structural responses, such as run up, overtopping, or armor layer damage. In this paper, a reliability analysis of the breakwater hydraulic stability of Sudimoro Power Plant, Pacitan is performed with Monte Carlo simulation. The formulas used in hydraulic stability calculations were Hudson and Van der Meer formulas. The analysis shows that the breakwater structure in Pacitan Power Plant already meets the hydraulic stability design with reliability of 98,8% for Hudson and 95,12% for Van der Meer formula. This paper also presents the reliability of breakwater armour units proposed by authors.
Effect of Permeable Structure on Coastal Sediment Transport in Demak Regency, Central Java, Indonesia Model by Using Delft3D Software
Authors: Iqbal M , Widyaningtias  , Wiyono A , Adityawan M B , Sukarno I , Sekaring Bumi I 
Published: March 2021

Abstract
Coastal area in Indonesia are places that has a variety of function both economic, culture and social. As time goes by, coastal areas sometimes damaged because of human activities. Declining coastline that caused by erosion is one kind of problems that might be occurs in this area.
Coastal area in Timbulsloko is the example of coastal area in Indonesia that’s experiencing declining coastline. One of the attempts to resolve this problem is by constructing permeable structure based on Building with Nature concept. One of the methods to find out whether it’s effective or not is by using software modelling to model sedimentation process in this area. By using Delft3D software, there are three model scenario used to model the sedimentation process. the first scenario was made to model sediment transport in the area itself. The second and third scenario were made to model sediment transport in the area with addition of existing permeable structure design. From the results of the models, the first scenario result shows the area is generally eroded. Furthermore, the placement of permeable structure that is simulated in the second and third model was resulting the increasing sedimentation process around the structure. The sedimentaion process around the structures in the third scenario occurs with sedimentation rate around 0.15 – 0.7 m/year. So, the model shows that the permeable structure itself can be used to protect the coastal area from eroding dan helps the recovery of coastal area.
Temperature and Salinity Condition Based on Field Measurement at Pasir Putih Waters Situbondo
Authors: Pahlewi A D , Handayani C 
Published: March 2021

Abstract
Temperature and salinity affect to pollutant dispersion, used as water quality indicator and also limiting factor for organism distribution pattern. Pasir Putih Situbondo state as waters conservation area because of its natural resources diversity. The changes in water temperature and salinity at Pasir Putih water can affect to the living organism in it. Monitoring of water quality become part of the effort to manage the water resources and other related components. The aim of this study is investigate temperature and salinity distribution in Pasir Putih water. Temperature and salinity was measured from 6 stations horizontally. Sampling of temperature and salinity took the surface water and using in-situ methods. The sampling was done in ebb condition. The result of this research is the average temperature and salinity of six sampling locations is 30.7°C and 33.3%o. The temperature and salinity are in normal condition according to standart value in Decree of the State Minister of the Environment Number 51 of 2004.
Design of Reverse Osmosis Desalination Plant at Remote Coastal Area
Authors: Fitri Sutopo Purwono , Baheramsyah Alam , Santoso Agoes , Nugroho Taufik Fajar , Iswantoro Adhi , Ikhwani Hasan , Ditya Danang Jawara 
Published: March 2021

Abstract
During the long dry season hit most parts of East Java in 2019, there were 566 villages in 180 sub-districts that are categorized as dry areas with critical clean water supply, 236 villages in 93 sub-districts as rare dry areas, and 20 villages in 14 sub-districts experienced limited dryness. In big cities in Indonesia, clean water service coverage has only reached 64.3%, while in rural areas still at 69.4%. This proves that most of the regions in Indonesia still experiencing a clean water crisis. Therefore, alternative clean water processing technology is needed to help supply clean water in these areas. Desalination as one of the technologies is essential for coastal areas that are remote from freshwater resources. In this paper, authors propose a design of photovoltaic reverse osmosis (PVRO) desalination plant at remote coastal area to supply clean water. A 100 m3/day design of PVRO, which is compact and energy efficient including the ultrafiltration method is introduced.
Efficient Coordinated Dust Removal Technology and Economic Analysis of Desulfurization System Under Ultra-Low Emission Situation
Authors: You L Z , Zhu Y 
Published: March 2021

Abstract
Base on the ultra-low emission reconstruction project of the 2×600MW unit desulfurization system in the Northwest China. The desulfurization system synergistic dedusting technology route achieves ultra-low emission of soot under the premise of maximizing the use of existing equipment. Through the comparison of the three-stage roof demister, Tube type dedusting and demisting device and condensing type dedusting and demisting device technology, the three-stage roof demister is stable, mature and reliable, and widely used. Under the same transformation conditions, the cost of the three-level roof demister is lower than the other two dust removal and demisting devices.
Lithium-Ion Battery Thermal Runaway Electro-Thermal Triggering Method and Toxicity Analysis
Authors: Xie H J , Sun J , Li J G , Zhou T , Wei S P , Yi Z H 
Published: March 2021

Abstract
In high temperature condition, lithium-ion batteries have a greater risk of thermal runaway. Lithium-ion batteries may be exposed to smoke, combustion, or even explosion, which poses a greater threat to humans and the environment. In this paper, the electro-thermal triggering method is used to induce thermal runaway of the lithium-ion batteries. The most representative ternary polymer lithium-ion battery (NMC), lithium cobalt oxide battery (LCO), lithium iron phosphate battery (LFP) in the market were selected as experimental samples, all using 18650 batteries, and then the state of charge of battery samples were adjusted to 0%, 30%, 50%, 100%. The thermal runaway reaction phenomenon of lithium-ion batteries and the surface temperature of the batteries were recorded. The positive electrode samples of the batteries were characterized by X-ray diffraction and electron microscopy, and the thermal runaway reaction products were analyzed. The results show that with the increase of the state of charge, the thermal runaway reactions of the batteries are more severe. Thermal runaway reaction products contain a large amount of toxic substances, and prevention and protection are necessary.
A Short-Term Electricity Forecasting Scheme Based on Combined GRU Model with STL Decomposition
Authors: Tian Y J , Zhou S J , Wen M , Li J G 
Published: March 2021

Abstract
With development of smart grid, the stable operation of grid has put forward higher requirements for system dispatch. In particular, short-term load forecasting of power systems is a key factor of power grid management systems, which is related to the safety, economy, and stable operation of the smart grid. However, short-term electricity forecasting is affected by many external factors. It has complex characteristics, especially non-linear relationships, so it cannot be accurately predicted. Recently, Recurrent Neural Network based models have good performance in electricity forecasting because of their excellent ability to capture non-linear relationships. However, they cannot fully capture historical information, especially local historical information, which has an impact on prediction accuracy. In order to address these problems, we propose a scheme by combining STL decomposition and GRU model. Specifically, we first decompose the original time series into three different components by STL. The decomposition results are separately imported into the main prediction module, which uses two GRU networks with different structures to obtain the local and global dependencies of the data. We also add an autoregressive method to make the model more robust. The proposed scheme is validated based on real-world data, and the simulation results show that our proposed method can perfectly capture local and global information and achieve higher prediction accuracy than traditional models.
A Decision Support System for the Planning of Hybrid Renewable Energy Technologies
Authors: Kazak J K , Mrówczyńska M , Skiba M , Bazan-Krzywoszańska A , Świąder M , Tokarczyk-Dorociak K , Szewrański S 
Published: March 2021

Abstract
Implementation of renewable energy resources (RES) with the use of knowledge-based approach requires systems which enable to combine data from different databases in order to multidimensional character of analysed factors. Therefore, this study provides the decision support system for the planning of hybrid renewable energy technologies designed for regional authorities. The system in this research integrates two RES: solar and wind. Moreover, it combines energy potential data with administrative division and data on land cover. Presented functionality shows the ability of single-element filtering as well as multi-element filtering which gives the opportunity visual data discovery. The novel decision support system designed in this research can constitute an effective instrument, which can help regional decision-makers to locate single-source as well as hybrid RES installations to meet the requirements of renewable energy production. The systems were designed for the case of Lubuskie Voivodeship (Poland). However, besides the fact of customized system for one region, the use of universal databases allows to prepare similar tool for any other region in European Union.
Study on Difference Between Two-Terminal LCC-HVDC and Three-Terminal LCC-HVDC Control and Protection System
Authors: Feng L 
Published: March 2021

Abstract
The paper studies the difference between two-terminal Line Commutate Converter Based High Voltage Direct Current (LCC-HVDC) and three-terminal LCC-HVDC control and protection system relying on the Yun-gui Interconnection Project of China Southern Grid (CSG). Contraposing the difference of topology between two-terminal LCC-HVDC and three-terminal LCC-HVDC, the paper introduces several special topology structures of three-terminal LCC-HVDC. Then the paper conducts comparative analysis on control strategy, protection strategy and communication strategy between the two-terminal LCC-HVDC and the three-terminal LCC-HVDC. Finally, the paper illustrates the unique key problems of three-terminal LCC-HVDC and solving ideas, which has guiding significance on three-terminal LCC-HVDC engineering application.
Research about the Sensorless Vector Control of Permanent Magnet Synchronous Motor Based on Two-stage Filter Sliding Mode Observer
Authors: Yang C , Jian W , Chen Y F , Huang X C , Li Y R , Peng G S , Gao Y 
Published: March 2021

Abstract
In order to overcome the disadvantages of installing mechanical sensors and the problems of chattering and low observation accuracy in traditional sliding mode observer sensorless control, a two-stage filter Sliding Mode Observer (SMO) is proposed in this paper. By collecting the current and voltage of the Permanent Magnet Synchronous Motor (PMSM), the SMO algorithm is realized by using the state equation of the motor in the synchronous stationary coordinate system; the position of the rotor is estimated by the arc tangent function, the observation accuracy of the rotor position is improved by increasing phase compensation; the variable cut-off frequency filter is introduced to make the Low Pass Filter (LPF) cut-off frequency can be self-adjusted with the change of rotational speed, which improves the estimation accuracy of rotor position at different rotational speeds. Kalman filter is introduced to form a two-stage filter with variable cut-off frequency LPF, which greatly weakens the chattering of the motor and reduces the observation error. Finally, the simulation is carried out under MATLAB/Simulink. The simulation results show that the PMSM vector control system with two-stage filter sliding mode observer has high estimation accuracy, good dynamic and steady-state performance, strong anti-jamming ability and robustness.
Evaluation of Minimum Boundary Output Stability of Thermal Power Units
Authors: Han Y , Cai B , Wang Y K , Yü Y L , Gao Z P , Fu X C 
Published: March 2021

Abstract
In order to improve the load regulation capability of the power grid, verification of the minimum boundary output characteristics of deep peak regulation of coal-fired units was carried out. Considering the safety, stability, environmental protection, and energy saving indicators, the minimum output stability evaluation method was discussed in a 300MW coal-fired unit, and the ultra-low combustion stability target of 25% of rated load was completed. This has important guiding significance for approving the output characteristics of units, carrying out precise load regulation, and expanding new energy consumption.
Optimal Scheduling of MGT-IES Considering Heat Load Uncertainty and Heating Characteristics
Authors: Kong X F , Shen J , Li Y X , Zhang J L 
Published: March 2021

Abstract
Considering the thermal and electricity needs of users in the integrated energy system, in recent years, combined heat and power systems with micro gas turbines as the core have been widely used in integrated energy systems. How to coordinate and schedule heating and power supply in an integrated energy system is very important. In this paper, we take a micro gas turbine-integrated energy system (MGT-IES) as the research object, aiming at the uncertainty of heat load, we adopt a multi-scenario random planning method, while combining user heating comfort the degree of ambiguity and the thermal inertia of the heating system are considered. The indoor thermal comfort index is used to convert the heat load demand from the traditional curve to the interval, so that the heat load is elastic at each point in time, and finally it is established to be more in line with the actual optimal scheduling model. The case analysis shows that after comprehensively considering the uncertainty of the heat load side and the thermal characteristics of the heating system, MGT-IES can effectively reduce the operation cost of the optimized dispatching while meeting the user’s heat load demand.
Optimization of the Configuration of the CCHP System
Authors: Mohsin T , Shen J , Zhang J L 
Published: March 2021

Abstract
In this article, we have optimized the total operational cost of combined cooling heating and power system (CCHP). This cost is further divided into three major parts, which are the capital cost of the equipment, fuel cost, and the grid electricity cost. The heat storage tank has also been used to store the excessive heat that can be utilized when needed. A genetic algorithm has been used for the optimization of the whole system. The decision variables chosen were 74. The optimization resulted in significant reduction in the total cost. The final results show that the cooling demand was significantly supplied by the Grid through the electric chillers because of higher coefficient of performance, while the power demand was met through the power generation unit. Results shows that the natural gas cost consumption is much greater then the grid and equipment cost.
Influence of the Access of Distributed Generation on the Distribution Network System of Inner Mongolia Power Grid and Countermeasure Analysis
Authors: Tao K , Yuan H , Fan H L , Sarengaowa  , Sun Z B , Yi X L , Li Y Q 
Published: March 2021

Abstract
Solar energy resource is highly rich in Inner Mongolia regions, and the customers utilized electric are scattered in the vast grassland. Thus, the distributed generation with its unique performance and high quality, has been developed rapidly in recent years. However, the large-scale distributed power supply has brought many unpredictable impacts when they are accessed to the distribution network, even seriously affecting the safe and stable operation of the distribution network. In this work, the technical barriers caused by distributed power generation to the grid-connected have been explored. In addition, the constraints and key influencing factors of distributed generation on distribution network have also been analysed and a safe and stable operation strategy to access distributed photovoltaic power supply into the network has proposed. The results here could provide a theoretical guidance for the rapid formulation and optimization of the distributed power accessing into grid network in Inner Mongolia power grid.
Fabrication of A New Asphalt Binder for Road Applications
Authors: Liu Z 
Published: March 2021

Abstract
A new asphalt binder for road applications was prepared by mixing coal tar pitch and petroleum asphalt, and then modifying with compound modifier which was made by ourselves. Coal tar pitch and petroleum asphalt was 1:1 for weight. The modifier was made with epoxy resin, chopped carbon fiber which was modified by 3-Aminopropyltriethoxysilane (KH-550) and other auxiliaries. According to “Standard Test Methods of Bitument and Bituminous Mixture for Highway Engineering” JTG E20-2011, the properties of the modified asphalt (MA) were studied, and the best modification technology was mechanical shear of 3000r/min shear rate for 30mins at 110 °C, the amount of modifier was 5%. The properties of MA mixture were also researched, the performance of AC-20 mixture can meet the JTG F40-2004 “Specification for construction of highway asphalt pavement” in the relevant requirements. The oil-stone ratio was 4.7%. The requirement of dynamic stability was ≥ 800n/mm, the wheel tracking test showed the MA mixture exhibited a value of 1323n/mm, which meet the requirement. The MA mixture low-temperature property was studied by the beam bending test, the results indicated a higher value than the AH-70 mixture standard. The Freeze-thaw split test demonstrated the MA mixture water stability meet the requirement for asphalt. In all, a new asphalt binder for road applications was obtained by mixing coal tar pitch and petroleum asphalt, its properties meet the standard of AH-70 and its mixture. The modifier was added for 5% and the effect was best.
Source-Network-Load-Storage Coordinated Control System Based on Distribution IOT Cloud Platform and Virtual Power Plant
Authors: Han T , Jiang G D , Sun B H , Feng R Q , Wang B W , Cao L L 
Published: March 2021

Abstract
In view of the distribution network operation problems caused by many distributed generations integration to distribution network, and the increasingly serious peak valley imbalance in grid, this paper proposes a coordinated control system of source-network-load-storage based on virtual power plant technology, which is designed and implemented in the actual project. The system uses cloud platform technology and multi-energy complementary technology to realize coordination and optimization control mechanism between sources, network and loads in regional distribution network. The system is based on the distribution Internet of things cloud master platform. Through the virtual power plant technology, resources such as cogeneration, photovoltaic, wind, distributed energy storage, electric vehicles, flexible loads are aggregated to achieve coordinated and unified control, realize the optimal operation of multi-energy complementary. It can accept the control of the dispatching center, and participate in the power transaction of demand response. Based on the application scenario, this paper explains how to use virtual power plant technology to participate in demand response power transaction, and describes the transaction rules and processes. The system is beneficial to the safety and reliability of the distribution network. It can implement reasonable configuration and consumption of distribution generations. It can control controllable loads such as electric vehicle charging pile to participate in peak regulation of power grid, and provide strong technical support for the realization of demand response.