bluuebunny/crossref_metadata_2025_split huggingface dataset:
A novel single-ended fault location method for long-distance HVDC transmission lines based on cross-correlation analysis
Authors: Shi Lei , Guo Ningming , Qi Jincheng , Liu Ruopeng , Mao Chunxiang 
Published: February 2020

Abstract
The transmission line, as the faultiest device in power system, cross many complex areas which will cause worse work condition. This is, both the rate of faulty and the difficulty of the manual fault location are raised. While accurate fault location method could reduce the workload and outage cost, increase the speed of repairing and improve both the reliability and economics of power system. Therefore, it is essential for HVDC systems which have much longer transmission lines. The existing fault location device of HVDC transmission lines are based on the principle of transient travelling-wave. However, due to the interference caused by on-off of power electronic devices and signal resonances, the single-ended travelling-wave method can not be applied in HVDC. The characteristics of clutter interferences of HVDC system and the coupling between double pole lines are analyzed in paper. A novel single-ended travelling-wave fault location method for HVDC transmission lines based on the correlation between two pole lines is proposed. The signal of the non-fault pole line is applied as reference signal; the method suppresses interference through the cross-correlation calculation between the fault and the no-fault pole line. So the reflected wave is enhanced and the identification reliability of the reflected wave is improved. The validity of the method is verified by simulation and on-site data analysis.
Distribution terminal automatic test system based on portable solution
Authors: Weichen Liang , Bo Liu , Junna Liu , Xuan Li , Lin Xiao 
Published: February 2020

Abstract
Distribution terminals have been widely and maturely applied in China currently. However, due to the large number of manufacturers, the differences in production technology, research and development technology lead to inevitable differences in the quality stability of distribution terminals. At the same time, it is also necessary to locate the faults of distribution terminals that are operating online and have faults. The traditional manual test method is difficult to meet the requirements of test specifications. It is also necessary to consider the requirements for testing batch operations and multi-scene applications. Based on the background, this paper proposes a distribution terminal automatic test system based on portable solution, which can complete the automatic test for distribution terminal in multiple scenarios.
Research on restraining low voltage of distribution power network using STATCOM
Authors: Qingren Jin , Ke Zhou , Mei Guo , Yangjun Zhou 
Published: February 2020

Abstract
In order to solve the problem of low voltage in distribution power network, this paper proposes a novel static synchronous compensator (STATCOM) based on modular multilevel converter. When the bus voltage of distribution power network changes rapidly, The MMC-STATCOM can quickly provide reactive voltage support and maintain the stability of bus voltage. Firstly, this paper introduces the operating principle of the MMC-STATCOM, and then propose three-level control strategies including device-level-, converter-level- and system level-control. Finally, based on the data of a power station in the distribution network, Simulation is carried out in the power system analysis and synthesis program (PSASP). The simulation results show that the MMC-STATCOM control function is reasonable and can respond quickly to the system reactive power change. It can effectively realize the voltage support and ensure the safe and stable operation of the power network.
Energy storage locating and sizing method in grid-connected micro-grid
Authors: Furan Guo , Wenzhuo Song , Fanbin Meng , Qingfeng Zhang , Yao Gao 
Published: February 2020

Abstract
In micro grid, the distributed generations have a large proportion and the energy storage system is the fundamental structure of the micro grid. Wind and photovoltaic power generation contain intermittent and uncertain characteristics. Energy storage system in micro grid can smooth the volatility of distributed power and supply power to important loads in case of the insufficiency of distributed power generation. In this paper, a location and capacity planning method of energy storage system is proposed. The energy storage installation points are the key points of the system, which are identified based on the electrical distance. Further, the capacity is optimized and solved on these basics. Finally, the effectiveness of the proposed method is verified through case studies.
The development of a high efficiency microturbine generator for a vehicle
Authors: Iakunin R , Kostyukov A , Kozlov A , Nadareyshvili G , Terenchenko A 
Published: February 2020

Abstract
Currently, microturbines are becoming increasingly common in power generation. There is a desire to use them as an energy source for the hybrid cars with the wheels driven by an electric motor. However, stationary microturbines are not well adapted for use on the automobiles. The main differences are frequent engine stops and lack of space for large heat exchangers. These differences lead to a decrease in the engine efficiency. The article discusses the technical solutions for the design of microturbines with high efficiency, small size of the heat exchanger and the bearings with reduced friction losses. The calculation studies have shown a possibility of achieving high efficiency for microturbines in a car. Currently, tests of real engine components to confirm the calculations have ended. Based on the test data, a microturbine is being designed. This microturbine will have been made by the end of this year.
Effect of tangential absolute velocity at outlet on open flume turbine performance
Authors: Nasution Sanjaya BS , Adanta Dendy , Warjito  , Budiarso  
Published: February 2020

Abstract
To address the electricity crisis in Indonesia, the use of open flume pico hydro turbines is a potential solution because Indonesia has 19 GW of hydropower resources at mini, medium, and pico scales. There are two concepts for the design of an open flume pico hydro turbine runner: Euler and Nechleba. Euler’s concept recommends that the absolute tangential velocity at the outlet of the blade be zero to optimise power absorption. By contrast, Nechleba explains that to reduce flow separation at the outlet of the blade (separation can reduce efficiency), tangential absolute velocity at the outlet of the blade must not be zero. Accordingly, this study compares the performance of blades designed with these two concepts using a computational fluid dynamics method. The results showed that the maximum efficiency of the blade using the Euler concept was 70.08%, while the blade using the Nechleba concept was 74.39%. Based on the results, a runner design concept that assumes a non-zero tangential absolute velocity at the outlet of the blade is recommended for use in designing an open flume pico hydro turbine runner.
Improved method on hydraulic power calculations for conventional sucker rod pumping system
Authors: Mwangupili O E , Chunsheng P , Bululu C , Nyanswi S L , Muya S M 
Published: February 2020

Abstract
The annual energy consumption of suck rod pumping units in China is more than 10 billion kWh, but the average efficiency is only about 25-31%. Limited information is known, about the efficiency of various components of the pumping unit. The current methods for calculating the hydraulic power neglect the effect of friction and free gas. This research introduces an improved method for calculating hydraulic power which takes into account the effect of friction and free gas. The model was obtained from the product of two parameters which were, predicted pressure increased by the downhole pump and predicted flow rate. The pressure increased by the pump was obtained by the nodal analysis approach in which the concepts of multiphase flow were included. The Computer program was developed and all calculations in this paper were computed by this program developed from python programming language version 3.5. This model was compared with the previous models and showed that, the previous models underestimated the hydraulic power since the influence of gas and friction were not included.
Research on non-intrusive monitoring of large power data industrial users
Authors: Li Wenfeng , Bai Hongkun , Wu Bo , Bu Feifei , Hua Yuanpeng , Lu Hao , Yang Yongchun 
Published: February 2020

Abstract
This paper constructs a non-intrusive monitoring method based on wavelet packet decomposition and fast Fourier decomposition technology to monitor the key production processes of high-energy-consuming and high-pollution industrial enterprises by utilizing the large data of power consumption of key industrial users such as iron and steel. Taking a steel plant in Henan as an example, using the constructed non-intrusive monitoring method, the load curve of the main production process is decomposed to achieve effective monitoring of the main processes of iron making, steel making and steel rolling. At the same time, through the typical link power capacity measurement, the company’s steel production capacity is obtained, which can provide technical support for the supervision of key industrial users such as steel.
Study on stability feature extraction of power system using deep learning
Authors: Shi D Y , Lv Y , Yu Z H , Lu G M , Dai H Y , Xie M , Zhang L L 
Published: February 2020

Abstract
Dynamic security assessment (DSA) of power grids is widely used in dispatching operation systems, and calculation speed is one of its most important performance indicators. In this paper, a stability feature extraction method is proposed, which is useful for quick judgment of stability and assisted decision-making. Firstly, a simulation sample database is constructed based on historical online data and a deep learning model with least absolute shrinkage and selection operator (LASSO) is trained to pick both the high level and low level stability features. While a new operation mode needs to be evaluated, a fast search is implemented to obtain the most similar samples in the database using the chosen high level features; the final result will be determined comprehensively by the familiar samples. If the power grid is in critical condition, a decision-making will be done by using the low level features. The validity of proposed method is verified by the simulation using online data of Northeast Power Grid of China. It is proved that the method meets the requirements for speed and accuracy of online analysis system.
Dynamic reactive power optimization method based on the transformer dummy node model
Authors: Wang Aifeng , Wei Hua 
Published: February 2020

Abstract
This paper proposes a dynamic reactive power optimization method based on the transformer dummy node model. Compared to the method based on the traditional equivalent n circuit, the proposed method adds the voltage at the dummy node as a variable, together with the voltage at the other side of the transformer, to express the voltage change on the two sides of the transformer. So the turn ratio of transformer is removed from variables, and the power flow equations of transformer branches do not contain turn ratio and its square, both the dimension of power flow equations and the number of non-zero elements in the Jacobian and Hessian matrix reduce, which decreases the calculative amount and accelerates the solution process. The test results of IEEE4, 14, 30 bus systems show that the proposed method obtains the same optimal solution with the traditional method but converges more quickly. With higher computational efficiency, the proposed method is suitable for the practical application of power systems.
Analysis of average-closing-speed for medium-vacuum circuit breaker from theoretical calculation aspects
Authors: Sun Lijie , Peng Yanqing , Liu Yong , Wang Gang , Sun Xibao 
Published: February 2020

Abstract
Average closing speed is an important indicator for evaluating the performance of CB, in order to calculate the average closing speed of the spring operating mechanism of the medium voltage vacuum circuit breaker, the paper establishes a simplified model of CB mechanism, combined with the kinetic energy theorem, and obtains the average closing speed by analyzing the equivalent mass and energy of the mechanism. In order to verify the correctness of the proposed method, the paper establishes a CB simulation model to obtain the simulated average closing speed. In the calculation of the energy of the open-off phase, the paper adopts a segmentation calculation method, which divides the closing process into the open-distance phase and the over-travel phase, and the calculated average closing speed is more accurate. This theoretical calculation method provides a theoretical basis for the research and development of the medium-voltage vacuum CB spring operating mechanism, and plays a positive role in related research and development work.
Wavelet-based baseline correction optimization algorithm for SF6 spectral signal
Authors: Wenfeng Liu , Yanting Wang , Liang Liu , Mingshu Yao , Xiaofeng Xu , Jing Gao , Liang Wang 
Published: February 2020

Abstract
SF6 gas is widely used in various power equipment. In this paper, a baseline correction algorithm based on spectral detection method based on optimal wavelet basis is proposed. The algorithm selects the optimal wavelet base, removes the strong spectrum information by threshold method, eliminates the influence of continuum fitting, and performs the least squares fitting on the residual signal to obtain the continuum, and removes the continuum from the original spectrum to obtain the required Line spectrum. The accuracy of the quantitative analysis of the line spectrum intensity after processing is greatly improved, and the baseline is effectively estimated and corrected, and the fitting accuracy is higher than the traditional iterative wavelet baseline correction algorithm.
Energy self-sufficient sensor node for long range wireless networks
Authors: Bolte P , Witkowski U 
Published: February 2020

Abstract
Wireless networks can have different architectures depending on the application context. In this paper, we concentrate on a wireless network that supports a gateway to a server being accessible from the internet. Many typical related applications can be found in IoT and Industry 4.0. Focus of this paper is on the design of a sensor node that is energy self-sufficient and supports the LoRa communication standard. By using LoRa long range wireless communication of up to several kilometres range becomes possible. Therefore, large areas can be covered by using multiple sensor nodes. Special attention had been on low-power design aspects to run the node with rechargeable battery and small photovoltaic cell only. Example application is ambient monitoring and support of an aquaponics project.
Utilization of agar Gracilaria sp. as a natural thickener on liquid bath soap formulation
Authors: Dita L R , Sudarno  , Triastuti J 
Published: February 2020

Abstract
Agar Gracilaria sp. is potential seaweed in Indonesia with largely opportunity to be used as raw material for cosmetics, especially skincare creams, lotions, powder, lipstick, facial makeup, and soap. Liquid bath soap is one of the cosmetics that require thickener in the composition, which often generally uses carcinogenic cocamide DEA. On the other hand, agar Gracilaria sp. has a gelling agent capable of having a thickening effect on certain products such as liquid bath soap. This study aimed to determine the potential of agar Gracilaria sp. as a thickener agent in liquid bath soap as a cocamide DEA substitute. This study used agar Gracilaria sp. with a percentage of 0, 1, 2% and 1% cocamide DEA. Parameters determined were the viscosity, pH, specific gravity, microbial contamination, and organoleptic. Data were analyzed using analysis of variance (ANOVA) and Duncan test, while organoleptic data analysis used the Kruskal Wallis test. The study results showed that the addition of 1% Gracilaria sp. agar had 762.22 cPs viscosity, pH 9.06, 1.05 g/ml specific gravity, and <1x101 colonies/ml microbial contamination.
Correlation Between Glucose Level And Protozoan Ectoparasite Infestation Level Of Humpback Grouper (Cromileptes altivelis) Nursery In UPBL Situbondo, East Java
Authors: Mahasri G , Yodharta I N D , Novalisa D , Mukti A T 
Published: February 2020

AbstractThe purpose of this study was to determine the correlation between blood glucose levels of humpback grouper with an infestation of protozoa ectoparasites and the correlation between blood glucose levels and the infestation of protozoa ectoparasites in humpback grouper (Cromileptes altivelis) in the Sea Cultivation Development Unit, Situbondo, East Java. This research is survey research. The sample was in the form of a humpback grouper (Cromileptes altivelis) measuring 13-20 cm, 30 of which were randomly drawn from a population of 2,000 individuals. The results of the study showed that the blood glucose level of the humpback grouper Nurserys was the lowest of 21 mg/dL and the highest was 67 mg/dL. Humpback grouper Nurserys began to be infested withTrichodinasp. Ectoparasites, andCryptocaryonsp. in fish with glucose levels of 25-28 mg/dL included in the category of normal infestations, while fish with glucose levels of 29 - 36 mg/dL (Normal) are included in the category of mild to severe infestations. The results showed that there was a very close correlation between blood glucose levels of humpback grouper Nurserys and ectoparasite infestations. The higher the blood glucose level the higher the ectoparasite infestation in the Nurserys of the humpback grouper.
Study of heavy metal content cadmium (Cd) in various sizes of blood shells (Anadargranosa) in coastal Bancaran Bangkalan, Madura
Authors: Ulfah E S , Rahardja B S , Pursetyo K T 
Published: February 2020

AbstractOcean pollution occurs because of the concentration of population and industrialization in the coastal areas. The existence of heavy metals in the water can be accumulated in aquatic organisms, especially blood shells. The purpose of this study is to know the contents of cadmium (Cd) in blood shells, water, sediments and to determine the relation of blood shell’s size with the contents of cadmium (Cd) in the Bancaran Coastal, Bangka, Madura. The research method used was observations of that method. The main parameters are observed that the contents of cadmium (Cd) in seawater, sediment, and blood in the Bancaran Coastal shells. Supporting parameters that observed are water quality include temperature, pH, salinity, DO and brightness. Data analysis is used to find relations of the data Obtained (regression-correlation). The results showed that the contents of cadmium (Cd) of large shells blood are higher than the small and medium blood shells, and there were the relations between the size of the blood shells with the contents of cadmium (Cd). The water quality of Bancaran Coastal was the temperature 28°C-29°C, pH 7-8, the salinity of 30 ppt, the brightness of 30 cm, and DO 5 mg/L.
Effect of dense stocking of Gracilaria sp on growth and survival of milkfish (Chanos chanos forskal) on polyculture culture systems
Authors: Isroni W , Bahri A S , Amin A A 
Published: February 2020

Abstract
Milkfish cultivation has long been recognized by farmers and is now developing in almost all Indonesian waters. Fish culture technology is also experiencing rapid development, ranging from traditional maintenance to intensive technology that requires seed, water, and planned feed management. One way to fill the empty ecological space is to cultivate a mixture (polyculture) between several fisheries commodities. With this system, the benefits obtained are high land productivity. The development of aquaculture technology shows that milkfish (Chanos chanos Forskal) can be cultivated together with Gracilaria sp. Seaweed in a pond. This polyculture system can increase the efficiency of land use and farmers’ income in a sustainable manner. The study was conducted using the experimental method. The density of gracilaria sp distribution in this study was: treatment A (nongracilaria), treatment B (gracilaria 50 Kg), treatment C (gracilaria 100 Kg), treatment D (gracilaria 150 Kg) and Treatment E (gracilaria 200 Kg). The design used was a completely randomized design (CRD) with 5 treatments and 3 replications. The main parameters observed were growth including absolute length, absolute weight, specific growth rate, and survival. As supporting data the measurement of water quality is also carried out.
Effect of probiotic duration and dose of coffee peel fermentation (Coffea sp.) on crude protein and crude fiber as an alternative fish feed ingredient
Authors: Fatmawati N , Agustono  , Lamid M 
Published: February 2020

Abstract
The research aimed to find out whether there was interaction between fermentation duration and probiotics dose toward the increase in crude protein and decrease in crude fiber content in coffee peel. This research was experimental using complete randomized design (RAL) factorial, data analysis using duncan. The result of the research showed that there was interaction between duration and probiotics doses in coffee peel fermentation to crude protein in day 5 of fermentation duration with probiotics dose of 5%, it was the highest result of crude protein content. There was no interaction between duration fermentation and probiotics dose in fermentation of coffee peel toward crude fiber content in day 7 duration of fermentation with probiotics dose of 5%, it was the result of the lowest crude fiber. Fermentation in 7 days with dose of 5% was the best result. There was increase of protein from 12.15% to 13.93% and decrease of fiber from 34.27% to 30.8%.
Growth performance and survival rate of Boeseman’s rainbowfish (Melanotaenia boesemani) in natural spawning technique at Depok, West Java, Indonesia
Authors: Akhsan W M , Nur B , Dewi N N 
Published: February 2020

Abstract
Boeseman’s rainbowfish is an endemic ornamental fish from Papua. This fish is popular because of its beauty and uniqueness. Problems that occur in rainbow fish farming are low growth rates and high mortality rates in the larvae stage. The purpose of this research is to analyze the growth performance and survival rate of Boeseman’s rainbowfish. This research was conducted at BRBIH Depok, West Java, on December 17, 2018, until January 17, 2019. The technique is used was natural spawning technique. In this technique used aquarium containers and fiberglass tanks. Maintenance of the parent is done by feeding Chironomus sp. twice a day. The parent selection is carried out before the spawning process. The results of spawning for 20 days had a fertilization rate of 91.47 % and a hatching rate of 86.12%. Growth monitoring results of the average growth rate were 0.0031 g/day, the specific growth rate was 0.013 – 0.095 %bb/day and the survival rate of larvae was 47.24%.