bluuebunny/crossref_metadata_2025_split huggingface dataset:
Generalized Turbine Model Based Analysis and Simulation of Ultra-Low Frequency Oscillation of Hydropower Units
Authors: Li Jinzhao , Liu Mosi , Zhang Yihui , Meng Xuanren 
Published: December 2023

Abstract
The occurrence of ultra-low frequency oscillation (ULFO) events in the power grid has a significant number of hydropower units in recent years. Considering this aspect, relevant studies have shown that the turbine model has an important impact on the ULFO behavior of hydropower units. Based on the study of the generalized turbine model, the flow factor closely related to the inherent parameters of the turbine and the variation of the generating flow is defined in this paper. The ULFO model of the hydropower unit with full consideration of the flow factor is established. Based on the frequency characteristics of the system and the Routh stability criterion, the mechanism of the influence of the flow factor on the ULFO behavior of the hydropower unit is analyzed. The simulation results of single-machine and multi-machine systems show that, compared with the ideal turbine model, the generalized turbine model considering the flow factor can increase the stability margin of the system. It can provide greater damping torque and restrain the ULFO behavior of hydropower units. The flow factor is larger, and the suppression effect of the ULFO is more obvious.
Application of Big Data Water Distribution Technology in T Block of Q Oilfield
Authors: Sun Simian 
Published: December 2023

Abstract
With the extension of oilfield development time, a large amount of production data has been accumulated in the oilfield water injection development process, which brings great challenges and opportunities to the adjustment analysis, diagnosis, and optimization of oilfield development [1]. Based on geological static data, historical data such as production and monitoring at both ends of injection and production, and using big data and deep learning methods, this paper forms a big data analysis method for water injection optimization with the mode of “finding key layers of key wells, implementing key monitoring and deciding the best scheme”. Good results have been achieved in guiding the adjustment of single well water quantity in Block T of Q Oilfield. Eight water injection adjustment schemes have been deployed on-site, 16 intervals have been adjusted, and the daily water injection has been adjusted from 136 cubic meters to 120 cubic meters. After adjustment, the accumulated oil in the connected oil well stage has increased by 262.3 tons, and the production decline in the well area has been effectively controlled, which provides new technologies and new ideas for the dynamic development adjustment of the oilfield.
Assessment of the Applicability of PV/T Electric Heating System for the Storage of Crude Oil
Authors: Bao Yongjie 
Published: December 2023

Abstract
There are still some doubts about whether the solar photovoltaic/thermal (PV/T) system is applicable for the practical heating system of crude oil storage although there has been a lot of research work on PV/T and heating technology in the oil field. Due to the uneven distribution of solar radiation and uncertain thermal property of crude oil, the amount of energy provided and demanded is hard to evaluate. In this study, an electric heating system based on PV/T is proposed to be applied for the storage of crude oil. By establishing the mathematical model of the system, the energy supply capacity of PV/T and the heat demand of stored crude oil in typical seasons in Xinjiang are predicted by numerical method. The applicable scheme is discussed. This study may promote the application of PV/T heating systems in oil fields.
Research on Vibration Damping Analysis of UHV Suspended Converter Valve Model
Authors: Zhang Changhong , Lin Sen , Li Hongyuan , Yang Xu , Li Weiguo , Lv Jinzhuang , Lu Hai , Peng Xiang , Huang Jiajie 
Published: December 2023

Abstract
The UHV (ultra high voltage) suspended converter valve is hinged to the top of the valve hall, so the equipment has a long structural period, the suspended converter valve is displaced under the action of earthquakes, and the valve tower is susceptible to damage due to interaction with the important equipment connected to it. The high cost, large size, and weight of the real type of UHV suspended converter valve make it difficult to carry out shaking table test studies of the real type of equipment. In this paper, a numerical model of a UHV-suspended converter valve scaling device and its damping structure model are established, and a damping analysis study with damping at the top of the converter valve model is carried out. The analysis showed that the maximum displacement of the converter tower was 136.3 mm under the action of a 0.4 g El-Centro earthquake. With horizontal damping at the top, the maximum displacement of the converter tower is 62.9 mm, a reduction of 53.9% compared to the undamped case. This study proposes a vibration damping design for UHV suspended converter valve, laying the foundation for subsequent shaker test studies of the scaled-down model vibration damping structure of the UHV suspended converter valve and the productization of vibration dampers for the equipment.
Research on Online Gas Volume Monitoring Technology of Intelligent Gas Relay
Authors: Wang Jian , Zhu Mengzhao , Zhu Wenbing , Gu Zhaoliang , Wang Xuelei 
Published: December 2023

Abstract
The gas relay is the main non-electrical protection device of the transformer, which plays an important role. Traditional detection methods can not reflect the gas relay level, and there will be gas relay false alarms in operation and maintenance. Firstly, the working principle of the gas relay was analyzed, and a non-conductive capacitance sensor was proposed to realize the real-time monitoring of gas volume in the gas relay. Then, a new online monitoring scheme for intelligent gas relays was constructed through the selection analysis and optimization design of the gas protection module and liquid-level measurement module. Based on the changing state of gas volume in the gas relay, a more accurate and timely fault diagnosis of the power transformer was realized, and the prototype processing was completed. Finally, the feasibility of the volumetric testing method was verified by comparing the two conditions of different liquid-level heights and different ambient temperatures. The proposed method is of great significance for discovering the latent faults of transformers and realizing the condition monitoring of oil-immersed power transformers, which ensures the safety of power grid equipment and personnel.
Research on the influence of the connection and withdrawal of a 35 kV bypass system on the power quality of transmission lines
Authors: Zhang Guoxin , Li Muxuan , Chen Jianxin , Zhang Jianfeng , Li Zhengping , Huang Keyi , Huang Jiaming , Deng Qiangwei , Liu Gang 
Published: December 2023

Abstract
Uninterrupted power supply maintenance has become a trending issue with the increasing reliability requirements for 35 kV power transmission. The bypass operation holds significant importance in 10 kV and 100 kV power transmission maintenance. However, research on live maintenance of a 35 kV bypass system remains scarce and requires urgent supplementation. Therefore, this paper aims to determine the feasibility of live operation for the 35 kV bypass system by studying the impact of its connection and disconnection on the voltage and current of the transmission lines. The existing 35 kV bypass live maintenance system is analyzed and studied concerning the operational process. When the bypass system is connected or disconnected during the maintenance of transmission lines, it may cause changes in the voltage and current, which could affect the safety of power transmission. To address this phenomenon, the paper performs calculations and analysis for different scenarios, including moments of varying voltage amplitudes in the lines and different maintenance cable lengths in the bypass system. Through theoretical analysis and simulation, a comprehensive study of voltage and current variations in two different scenarios of transmission lines has been conducted during the simulation process, including equivalent capacitance and initial conditions for the transmission lines and bypass systems, enabling the simulation of the switching process. Based on calculations and analysis, this paper presents a safety assessment of live operation in the 35 kV bypass live maintenance system.
Study on the Maximum Outgoing Line Count of 750 kV Substations and Exploration of a Bus Short-circuit Current Suppression Method
Authors: Ding Yujie , Zhao Jinchao , Fu Guobin , Yang Kaixuan , Zhao Huanbei , Zhao Dongning 
Published: December 2023

Abstract
With the development and construction of new power systems, the power grid structure is becoming increasingly interconnected, and the issue of short-circuiting currents in UHV systems will gradually manifest over the next five years. Existing measures for short-circuit current control typically involve using standby units, lines, and main transformers. However, conventional measures are gradually unable to meet the control requirements, necessitating strict control of the network topology during the planning phase and the exploration of new technologies and methods to keep pace with the evolving era. This paper studies the maximum outgoing line count of 750 kV substations, providing theoretical references applicable to practical operations for planning departments. A conceptual method based on fast-switching technology to suppress the current during a short circuit at the 750 kV voltage level is proposed, establishing the groundwork for the practical implementation of high-speed switching technology in the 750 kV voltage-level power grid.
MTPA Control for PMSM Velocity-specified Position Tracking Based on the Principle of Backstepping Control
Authors: Sun Yiming , Wang Xuping , Yi Fan , Li Buchuan 
Published: December 2023

Abstract
In this paper, a control method based on the backstepping control is proposed to address the issues of uncontrollable speed and complex PI parameter tuning in the traditional PID position control of PMSM. By comparing with id=0 control, MTPA control enables the IPMSM to maximize the utilization of reluctance torque. The dq current relationship under MTPA control is established using a formulaic method. Based on this, a position, speed, and current backstepping controller is designed, which adds a degree of freedom to the speed control during the position control process while ensuring the stability of the control system. Simulation results demonstrate fast dynamic response, small steady-state error, and minimal parameter adjustments, thus verifying the correctness and effectiveness of this method.
Active Distribution Network Reactive Power Optimization Based on an Improved Genetic Particle Swarm Optimization Algorithm
Authors: Gou Shuai 
Published: December 2023

Abstract
As the distributed generation is gradually connected to the distribution network, it will lead to an increase in node voltage deviation and network loss. The active distribution network reactive power optimization approach based on an improved genetic particle swarm optimization algorithm is proposed in this paper to increase voltage quality and system efficiency. First, a reactive power optimization model for active distribution networks that has the least possible active power loss and voltage variation is developed. Then, the genetic idea is applied to the particle swarm optimization algorithm to improve it and address the issues of the long iteration time of the genetic algorithm and the tendency of the particle swarm optimization algorithm to settle into local optimal solutions. Finally, the enhanced genetic particle swarm optimization algorithm described in this paper is validated using the enhanced IEEE-33 node system. The findings indicate that this strategy can significantly shorten computation times while also increasing calculation precision.
A Tuning-free Fault Detection Method for Distribution Network Based on PMU Data and Random Matrix Theory
Authors: Hu Jiaxin , Xue Guiting , Han Zhaoru , Liu Changjiang , Xie Zhiguang 
Published: December 2023

Abstract
The increasing penetration of renewable energy sources has significantly altered the fault characteristics of distribution networks with distributed generators (DGs). The fault current is limited as the emerging solar plants normally connect to the grid via inverters. And the operating patterns of the system have become more diverse and complex. The traditional pre-tuned protection and fault detection methods are facing substantial challenges. This paper proposes a centralized fault detection scheme based on the random matrix theory (RMT) that utilizes synchronous phasor data from the distribution-level phasor measurement unit (PMU). Firstly, data normalization and resampling techniques construct the operating state matrix (OSM). Then the mean spectral radius (MSR) is calculated and used for fault detection without the complex tuning according to the operation state of the system. Finally, the faulty section is determined by comparing the features from different sub-group of the PMUs according to the topology partition. A multi-feeder distribution network is modeled in PSCAD and used to verify the proposed method.
Study of Tunnel Support Methods Based on RMR and Q-System Methods at Kerinci Merangin Hydropower Jambi Province
Authors: Saputra A , Azikin B , Husain R 
Published: December 2023

Abstract
Excavation of tunnel construction at the Kerinci Merangin Hydropower in Jambi Province is a complex job, because it will use the tunnel as a waterway which will always be faced with unstable conditions. One of the way to deal with instability is to classify the mass and determine the type of support on the roof and walls using empirical methods. The parameters in rock mass classification include mapping the structure, physical and mechanical properties of the material. Empirical analysis was carried out using the Rock Mass Rating (RMR) classification and the Q-System to determine the condition of the rock mass in the tunnel and determine the type of support that will be used and in accordance with the rock mass class. The rock mass classes in the study area of STA 8+869, 8+872 and 8+879 based on the RMR classification are included in rock class III, namely rocks that have moderate conditions (fair quality rock mass) and rock class IV, namely rocks that have poor conditions (poor quality rock mass). Meanwhile, the rock mass class based on the Q-System includes very poor rock mass.
The recommendation for supporting the tunnel face according to RMR in the study area is to use a combination of rockbolt, shotcrete and wiremesh supports, while the support recommendation according to the Q-System uses a combination of rockbolt and shotcrete supports.
Trip Distribution and Modal Choice in the Taman Mini LRT Station Area
Authors: Jumardi  , Wunas Shirly , Jinca M. Yamin , Natalia Venny Veronica 
Published: December 2023

Abstract
The surrounding Taman Mini LRT station boasts a diverse range of land uses, primarily characterized by residential zones, interspersed with dynamic activity hubs such as tourist attractions, shopping malls, and hospitals. The prevailing issue in this area relates to persistent traffic congestion, stemming from the overreliance on private vehicles, inadequate public transportation infrastructure, disjointed intermodal connections, and the lack of seamless integration between transportation modes and activity centers. This study endeavors to comprehensively analyze pedestrian and vehicular movement in the periphery of the Taman Mini LRT station. This analysis is pivotal in assessing the current mobility landscape. Notably, the intensity of activity within a particular land use directly correlates with its ability to draw vehicular traffic, consequently leading to prolonged waiting times for pedestrians at crosswalks. Employing a four-step model, this research methodically defines pedestrian and vehicular flow within the region. This model incorporates output distribution of trips and origin-destination graphs. Additionally, stated preference techniques are employed to discern respondents’ inclinations when making travel decisions. This involves evaluating key factors like travel time, fares, frequency, accessibility level, comfort, and safety – categories that significantly influence their preferences when selecting between LRT and other transportation modes.
Development of Sustainable Integrated Transit Area in Gorontalo Province, Indonesia
Authors: Lihawa Eriyanto , Jinca Muhammad Yamin , Hamzah Baharuddin , Syarif Edward 
Published: December 2023

Abstract
Transportation integration is the integration of air, rail and land transportation modes with the aim of improving transportation performance more efficiently and effectively. The development of transit areas is important in order to realize a sustainable transportation system. Isimu Terminal in Gorontalo Province is a gateway to access to various modes of mass public transportation that serve inter and intra-provincial transportation. This research aims to evaluate the existing conditions of the Isimu terminal based on the evolution of the implementation of transit area development according to the categories: seamless mobility, sustainable neighborhood and optimum growth. This research is qualitative deductive. Primary data was obtained through in-depth interviews with station users and direct observation. Secondary data is obtained through institutional surveys to relevant parties. The result the integration of services between Djalaludin airport and Isimu terminal does not seem to be optimally connected and the loading and unloading of goods outside the terminal is visible. However, this area has the prospect of functioning as an intermodal connectivity node with the planned infrastructure development of the train station, Djalaludin airport, and Isimu terminal, and as further suggestions this area can be developed into an integrated transit area and transhipment node.
The Influence Of Variations In Soaking Time Of Rice Husk Charcoal Briquettes On Its Performance
Authors: Suluh S , Bethoni Frans Robert , Lazarus Risa , Simon Christof Geraldi , Johan Chendri , Salo Lery Afriany 
Published: December 2023

Abstract
Rice husk is one of the biomass wastes from agriculture which is used as an alternative energy source in the form of briquettes. These briquettes are used as fuel in aluminum stoves. This study aims to analyze the performance of rice husk charcoal briquettes at various times of immersion in kerosene. The research method was carried out using experimental methods by testing rice husk charcoal briquettes on five variations in soaking time, namely 0 minutes, 5 minutes, 15 minutes, and 20 minutes, after testing on an aluminum stove alternately with the process of boiling water. The results showed that the highest flame temperature, ignition duration, ability to boil water, and highest thermal efficiency were 798% at 120 minutes, 24 liters, and 69.88% at 20 minutes of immersion.
Evaluating Coastal Area Suitability and Ecological Carrying Capacity in Topejawa Village, South Sulawesi
Authors: Nurjayanti  , Hatta Muhammad , Tuwo Ambo 
Published: December 2023

Abstract
Marine and coastal tourism has rapidly emerged as promising sectors with the potential to drive sustainable regional development. Achieving the status of a sustainable tourist destination requires adherence to specific criteria, particularly concerning the ecological carrying capacity of tourism activities. This study aims to evaluate the suitability and carrying capacity of beach tourism in Topejawa Village, Takalar Regency, South Sulawesi, Indonesia, focusing on recreation and swimming activities. Data were collected from eight strategically located observation stations along the beach area from March to August 2022. Using the Tourism Suitability Index (TSI), we assessed ten parameters to evaluate the beach’s physical condition. Additionally, we conducted an analysis of the Ecological Carrying Capacity (ECC) to determine the maximum number of visitors that the tourist area can sustainably accommodate for recreation and swimming activities. Our findings indicate that Topejawa beach area’s stations I, III, and IV were classified as ‘suitable’ with TSI values ranging from 1.8 to 2.1 across all stations. The ecological carrying capacity analysis revealed that the beach can accommodate up to 1,257 individuals per day for recreation and 15,171 for swimming activities. We recommend the period from March to November for beach tourism due to favorable weather conditions. These results demonstrate the significant potential of Topejawa Village for sustainable ecotourism development, emphasizing the importance of ecological carrying capacity assessments and sustainable tourism practices. As coastal tourism continues to thrive, this study provides valuable insights for the responsible management and growth of Topejawa’s beach recreation tourism industry.
Analysis Of NOx, SO2, PM10, & CO Emission Loads From Motorized Vehicle at Collector’s Road Makassar City Using Tier 2 Method
Authors: Savirah Nurul Auliah MA , Aly Sumarni Hamid , Harusi Nurul Masyiah Rani 
Published: December 2023

Abstract
The biggest factor in the global reduction in air quality in large cities is the transportation industry. This is due to the molecules that gasoline, the fuel used in the transportation sector, emits, including carbon monoxide (CO), nitrogen oxide (NOx), sulfur dioxide (SO2), and CO2 (carbon dioxide), as well as hydrocarbons (HC), which are sources of carbon dioxide. of emissions of air pollutants An imbalance results from the rising motorized vehicle sales from year to year combined with poor traffic conditions. In urban locations, several collector roads—the hub of community activity—often encounter congestion, especially during rush hours. Because of the pollution these motorized vehicles produce, the congestion they induce has a negative effect on the environment. This study aims to determine the daily and yearly emission loads for the parameters of NOx, SO2, PM10, and CO produced by motor vehicles with three types of vehicles, namely motorcycles (MC), Light Vehicles (LV), which are divided into the Sedan category, Minibus, Taxi, Public Transportation, then Heavy Vehicles (HV), which are divided into Pick-up, Jeep, micro bus, big bus, 2 axles truck, and 3 axles trucks categories, on Collector Street in Makassar City utilizing the Tier 2 method and show the form for mapping the distribution of NOx, SO2, PM10, and CO emissions from motor vehicles on Collector Street in Makassar City using the Geographic Information System application. The findings indicated that Jalan Hertasning produced the highest emission load from the NOx, SO2, PM10, and CO parameters. This is because of the significant role that Hertasning Road plays in Makassar City’s urban road network, which results in a high volume of daily vehicle traffic on this road section. The CO parameter, which accounts for 104041.57 tons of the total emission load from motor vehicles on Jalan Hertasning, per year.