bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of nitrogen on mineral nutrients and cadmium accumulation in a strain of DSE mycelium under cadmium stress
Authors: Zhang Guangqun , Su Lin , Li Tianguo , Li Ming rui , He Yongmei , Qin Li
Published: March 2020

The dark septate endophytic fungus (DSE) Exophiala pinsciphila was used to study the effect on growth and mineral nutrients (Ca, Mg, N, P, S) and cadmium (Cd) accumulation of DSE under the different nitrogen concentration and cadmium stress (100 mg·L−1). Under cadmium stress, treatment with low nitrogen significantly increased the pH of the mycelium and culture medium, while high nitrogen significantly reduced the mycelium dry weight, the number of spores, and the pH of the culture medium. The minerals in the mycelium were significantly affected by nitrogen concentration; the Ca and P contents were significantly increased under high nitrogen conditions, while Mg and N content decreased significantly. Under normal nitrogen conditions while under cadmium stress, the nitrogen content of the mycelium was significantly decreased, while higher nitrogen significantly increased the cadmium content of the mycelium. The dry weight of DSE mycelium, the mycelium Cd content, and the mycelium Mg content were significantly negatively correlated, along with the dry weight of P and hyphae. Studies have shown that under cadmium stress, exogenously added high concentrations of nitrogen reduce DSE cadmium tolerance, inhibit growth, and cause the absorption and utilization of minerals; in contrast, low concentrations of nitrogen enhance the growth of the strain.
Calculation method of creep under decreasing stress considering variation of natural environmental factors
Authors: Zhao Yu , Wang Yan , Song Chuang , Zhou Yongjun
Published: March 2020

The actual structure is always in the state of natural changing environment and stress decreasing in the section. At present, there is little method for calculating the creep under decreasing stress which takes environmental variation into account. As excessive deflection becomes a serious problem for long span continuous rigid frame bridges during the operation period, in this paper, a creep calculation method is proposed for the continuous decrease of stress in most girder sections, and considers the environmental factors comprehensively. Firstly, the multifactor (temperature, relative humidity and reinforcement ratio) correction was made to creep model of the current code JTG D62. And five creep recovery models were compared and analyzed simultaneously. Based on the elastic creep theory and the superposition principle, the improved creep calculation method was proposed. Then theoretical calculation was carried out for the assumed structure. The results showed that the calculated value obtained by the proposed method were obviously different from those obtained by the code, and were significantly different from those obtained without considering creep recovery, which proves the superiority of the proposed method under the action of multiple environmental factors and decreasing stress.
Diversity and Comparative Evaluation of Fruit Traits of 46 Chinese Cherry Landraces
Authors: Wang Yan , Zhang Jing , Liu Zhenshan , Chen Qing , Yang Shaofeng , Wang Xiaorong
Published: March 2020

Chinese cherry[Cerasus pseudocerasus (Lindl). G. Don], belonging to the genus Cerasus, famliy Rosaceae, is an ancient fruit crop with high economic and ornamental values. Forty-six Chinese cherry landraces from three major distributed regions in China were collected to evaluate the genetic diversity and fruit characteristics. All landraces exhibit rich diversity in main fruit traits, such as peel color, fruit shape and size. The peel shows six different colors with the main color is red and orange-red. The fruit size ranges from to 7.68 mm / 7.52 mm (transverse / longitudinal diameter) to 23.01 mm / 22.99 mm (transverse / longitudinal diameter), with the fruit shape index from 0.77 to 1.16.Thirty-one landraces have more than 2.00 grams per fruit, with the largest being 7.10 grams (LYI6), and the smallest being 0.25 grams (SP8). The total soluble solid content is from 9.52% (ZT2) to 18.56% (SP8) among all landraces. XC4 shows the highest vitamin C content (8.05 mg·100mL−1), followed by BJ7a (7.35 mg·100mL−1) and JN1 (6.57 mg·100mL−1). By comprehensive evaluation, these landraces, LYI3, LYI5, WN2, BJ7, BJ7a, ZWY5, XC4, HC, HF, JY4 and PZB, show good and excellent fruit traits, revealing great potentiality for Chinese cherry breeding program.
Quantitative Evaluation Model of Energy Saving and Emission Reduction Effect of Generation Right Transaction
Authors: Guo Junhong , Xue Xiaoqiang , Li Ling , Xue Lu , Wang Yongli
Published: March 2020

The basic form and the process of power generation trading was introduced, also with the intention declaration model of power generation transaction and the transaction matching model were constructed. Then, a quantitative evaluation model of energy saving and the effect of emission reduction of power generation trading were built. Finally, through the example data of the power generation rights transaction declaration in Anhui province, the validity check results of the power generation rights transaction were analyzed, and the energy conservation and emission reduction effects of power generation rights trading were quantitatively evaluated. The results showed that power generation rights trading had significant energy saving and emission reduction effects, and had certain economic value and environmental protection value.
Corrosion Behavior of Carbon Steel in Carbonated MDEA-MEA Aqueous Solutions
Authors: Yang Junhan
Published: March 2020

In order to deal with the long-term corrosion problems in the absorption of carbon dioxide (CO2) using alkylol amines, perfecting the corrosion parameters is necessary. The tafel curves of carbon steel in carbonated N-methyldiethanolamine (MDEA)-monoethanolamine (MEA) aqueous solutions were investigated by using the CHI602E electrochemical analyzer. Then the corresponding corrosion rates were calculated. The temperatures ranged from 303.2K to 323.2K. The mass fractions of MDEA and MEA respectively ranged from 0.30 to 0.40 and 0-0.10. The CO2 loading ranged from 0.1 to 0.4. The effects of temperatures, mass fractions and CO2 loadings on the corrosion rates were demonstrated. Results showed that corrosion rates increase with increasing temperatures, mass fractions and CO2 loadings. Moreover, the corrosion rates of carbon steel in carbonated MDEA-MEA aqueous solutions are obviously less than the corrosion rates in pure MDEA.
Determination of Nevadensin in Fewflower Lysionotus Herb by Capillary Electrophoresis
Authors: Ren Xiaoyan , Liu Haixing , Wang Jiangang
Published: March 2020

This paper investigated the determination of nevadensin content in Fewflower Lysionotus Herb by high performance capillary electrophoresis (HPCE) method. The borax solution of 30 mmol concentration containing was chosen as buffer solution. The experiment was performed at a constant voltage of 16 kV and UV detection wavelength of 335 nm. The content of nevadensin content in Fewflower Lysionotus Herb was 2.818 mg/g(RSD=3.22%)(n=6). The recovery of nevadensin in Fewflower Lysionotus Herb sample was in the range of 88.1%-105.8% (n=5) This method is suitable for the detection of the content of nevadensin in Fewflower Lysionotus Herb.
Determination of Nevadensin in Malan Ganhan capsules by Capillary Electrophoresis
Authors: Ren Xiaoyan , Wang Jiangang , Liu Haixing
Published: March 2020

The article analyzed nevadensin content in Malan Ganhan capsules by capillary electrophoresis (CE) technology. The electrolyte solution was 30 mmol borax solution with 16 kV voltage and 335 nm UV wavelength. The content of nevadensin in Malan Ganhan capsules was 0.991 mg/g(RSD=3.43%)(n=6). The recovery of nevadensin in Malan Ganhan capsules sample was in the range of 81.7%-100.2% (n=5). The method is simple and practical.
Selection and Study of Pump Type for Caohai ∼ Dianchi Connection Pump Station Project
Authors: Hu Weijuan , Sun Wenzhao , Chen Zhiyu
Published: March 2020

The Caohai-Dianchi Connection Pump Station Project is part of the Dianchi water quality improvement and stability plan. As a connected pump station connecting Caohai and Dianchi, it plays a role in replacing and cleaning Caohai water. In this paper, based on the construction purpose, layout conditions and parameters of connection pump station, the advantages and disadvantages of centrifugal pumps and mixed flow pumps are given after analysis and comparison from the pump selection principles, stable operation, and economic factor, and the final pump type is determined through comprehensive comparison, which can provide reference value for the design of similar pump stations.
Effects of Phytohormone Compatibility on Callus Growth of Rosa rugosa tunb
Authors: Chang Wenbo , Wang Xue , Lan Ying , Wang Meini , Wen Bin , Li Lan
Published: March 2020

To obtain superior quality callus and to regenerate root system of Rosa rugosa tunb and improve culture efficiency, this experiment used a multi-factor orthogonal test method to establish a sterile system with young leaves of R. rugosa tunb as experimental materialsand different concentrations of hormones in each stage. Explore the effects of plant callus growth. The results showed that the optimal disinfection method of explants was 70% alcohol 30s+0.1% HgCl2 8min. At this time, the browning rate was 46.70%, and the infection rate was 10.00%, which was 14.40% and 72.67% lower than that before disinfection. [Primary medium]: MS+1.5 mg/L 6-BA+3.0 mg/L NAA+3% sucrose+0.9% agar, the induction rate at this time is 75.00%, an increase of 62.50% compared with no added hormone. [Proliferation medium] MS+2.0mg/L 6-BA+0.2mg/L NAA+3% sucrose+0.9% agar, the callus diameter reached 2.49cm after proliferation, the growth was strong, and the callus was highly available. [Rooting medium] MS+0.4mg/L IBA+0.5g/L AC+3% sucrose+ 0.9% agar, the rooting rate is 75.00%, the root system is long and the growth is robust.
Intervention of Nitrogen Evolution on Species Diversity of Broad-leaved Forest Plants in Xianweng Mountain
Authors: Chang Wenbo , Sun Yanbin , Shen Penglin , Chen Qingsong , Miao Tianlin , Li Lan
Published: March 2020

Nitrogen evolution is one of the important factors driving biodiversity change. It is generally believed that the species diversity structure will be changed, and under the conditions of exogenous nitrogen addition, grasses and deciduous shrubs have a competitive advantage over hybrid grasses and evergreen shrubs. For the competition between plants in the same life type, the interaction between different life-type plants is not involved. Therefore, from the changes in forest ecosystem structure and nitrogen elements, the response of different life-type plants to nitrogen evolution can be further explored. The lower plant species of the deciduous broad-leaved forest-Mongolian carp are studied, and different gradients of nitrogen (0, 40, 80, 120 kg N·ha−1·yr−1) are added to the four gradients of extraneous nitrogen effects of nitrogen evolution on forest biodiversity in the north temperate zone. The results of five-year continuous nitrogen addition experiments showed that nitrogen addition significantly reduced the species richness and diversity of understory plants, and changed the species composition of the community. Nitrogen addition increased the species richness of shrub plants and diversity, reduced the richness of herbaceous plants, and reduced the important value of grasses and increased the important value of hybrid grasses. The study showed that long-term nitrogen addition significantly changed the species composition of understory plants, and the response of different life-type plants to nitrogen addition was also different.
Impact of Garden Plant Resources Allocation on Ecological Landscape in Cold Cities
Authors: Yang Tianqi , Gu Ye , Sun Yanbin , Wang Changbao , Cheng Haitao , Li Shengju , Li Lan
Published: March 2020

This paper analyzes the distribution of plant resources in the test plots, and aims to optimize the allocation of plants and improve the follow-up construction plan for the cold land ecological park. We provide basis and reference for plant species selection and diversification in the construction of cold land urban Greenland plant landscape, and further improve the urban environment. Taking Jiamusi City as an example, the plant species, ecological distribution and utilization of plant resources in Jiamusi City Park were investigated and investigated by sample method and field investigation method. The data were analyzed by the analytic hierarchy process, and the ornamental value of the regional plants was analyzed. According to the survey, there are 41 species of plants in the park in Jiamusi City, belonging to 15 families and 35 genera. Their use involves three aspects, such as edible medicinal, and has high application value. As a typical cold city, Jiamusi proposes to consider the concept of ecological balance and sustainable development while considering the ornamental nature of plant resources, to play a role in supporting the image of the city.
Explore the designated frequency band (EMF) effect of radiation on biological characteristics of Ocimum basilicum
Authors: Zhang Yaosheng , Ren Guoli , Zhang Wu , Yang Jiali , Wang Xue , Chu Yi , Li Lan
Published: March 2020

Explore and obtain the effects of irradiated Ocimum basilicum seeds on the biological mechanisms of germination and seedling growth in the specified frequency bands. In the experiment, two influencing factors of the specified frequency band and irradiation time were set, and different gradients of irradiated seeds were set. Non-magnetized treatment was used as a blank control group (CK) to determine the changes in the main chemical components in seeds and seedlings, and explore the radiation breeding biology mechanism. The results showed that 90 kHz-100 kHz had a significant inhibitory effect on seed germination, and the 50 kHz-70 kHz band had a significant effect on the germination of Ocimum basilicum, with 50 ± 2.0 kHz being the best. In the time gradient exploration, the main chemical content of seeds was the highest when irradiated for 20 min, and the growth effect of seedlings was the best. The specified frequency band (EMF) has the effect of promoting and inhibiting the germination and growth of basil. It stimulates the internal chemical composition to break the dormancy period of the seed, accelerates the anabolism, and increases the molecular assimilation of the building.
Research on resource and environment evaluation of Qaidam Circular Economy Experimental Zone
Authors: Cai Wenjiao , Li Na , Wang Jianjun
Published: March 2020

China’s economy is growing rapidly, and the demand for resources and its dependence on foreign countries continue to increase. Exploring the status quo between the regional economy, resource utilization, and environmental protection will improve economic development while protecting the environment and become sustainable development. This paper uses the economic data, “three wastes” emission data, enterprise resource data, and social resource data on the Qaidam Circular Economy ExperimentalZone from 2005 to 2017, and uses the entropy weight method to weight the data and then uses the comprehensive evaluation method to evaluate the data. According to the current situation, it is concluded that the industrialized and green development of the experimental zone has achieved remarkable results, and the management and control of the experimental zone management committee is crucial to the development of the experimental zone.
An experimental study on hydrometallurgical process for the separation of lead in waste CRTs funnel glass
Authors: Yin Jin , Li Shuo , Zhao Lei , Xu Tong , Zhang Zhilin , Tang Wenjie
Published: March 2020

Waste CRTs display funnel glass contains a lot of lead, and improper disposalof waste CRTs funnel glass is easy to cause greater environmental risks. Three extraction systems of citric acid/sodium citrate, EDTA-2Na, and citric acid/sodium citrate/EDTA-2Na were used to leach the lead in waste CRTsfunnel glass. The effect of extraction rate for three extraction systems was investigated. The results showed that the effect of the extraction systems of citric acid/sodium citrate/EDTA-2Na to leaching the lead in waste CRTs could reach more than 80%, which provides a way for the green treatment of waste CRTs.
Study on the Characteristics of Pyrolysis Gas and Oil from Corn Stalk Pyrolysis
Authors: Sun Yang , Fan Sichen , Yang Tianhua , Zhang Haijun , Chen Yongsheng
Published: March 2020

In this paper, stem-skins, stem-pith, stem-leaves of corn stalks were separated and pyrolyzed to produce pyrolysis gas and oil on the temperature-controlled slide tube furnace. The gas yield, the gas component and the oil-producing rate of the skins, pith and leaves of corn stalkspyrolysis were studied under the different pyrolysis temperatures and residence time. The results show that the pyrolysis gas yield and the oil production rate wereeffected significantlyby the temperature. With the increase of pyrolysis temperature, the gas yield of the skins, pith and leaves of corn stalks increased, while the oil production rate decreased. The maximum pyrolysis gas yield isthestem-leaves, the second is the stem-pith, andthestem-skin was the smallest. When the temperature increased from 550 °C to 750 °C, the content of CO and H2increased with the increase of temperature, while the content of CO2 in pyrolysis gas decreased. The contents of C2H4and C2H6did not change obviously, and the total content was about 2%. When thepyrolysis residence time was extended from 10 min to 60 min at 650 °C, the pyrolysis gas production rate of biomass increased gradually. When residence time was 10min and 60min, the gas production rate of the stem-skin was 34.32% and 38.92%, respectively. The component of the gaseous product is affected by the residence time, while the effect of oil yield is not significant.
Effects of soil testing and Formula Fertilizer on Fruit quality of the Kyoho Grape
Authors: Zhang Liu-Jia , Li Jing-Bai , Chao-Liu  , Fang-Liu  , Zhang Jia-Min
Published: March 2020

The effects of soil testing formula fertilizer on fruit quality of the Kyoho grape was studied by using 4-year-old Kyoho grape as the test material. The results showed that, scientific and reasonable formula fertilizer could improve the quality of grape comparing with conventional fertilizer, evidently increase the single grain weight of fruit and single ear weight of fruit, and also increase the vitamin C content, sugar-acid ratio and solid acid ratio. On the other hand, it could decrease titratable acid content, and slightly increase vertical and horizontal diameters, but had little effect on pericarp color.
Effects of microbial fertilizer on apple fruit quality
Authors: Liu Yangyang , Xu Ximin , Fu Haiyan , Zhao Mingyang , Chen Wei
Published: March 2020

Pre-harvest factors have a great impact on fruit quality. In order to study the effects of pre-harvest microbial fertilizer on fruit quality, we applied Pseudomonas fluorescens and Bacillus amyloliquefaciens to ‘Starkrimson’ apples during maturation. We found that microbial fertilizer treatment can significantly increase the content of fruit aroma and soluble solids, single fruit weight and brittleness, reduce the organic acid content of the fruit during maturation. These findings provide reference for the scientific selection of fertilizer.
Recovery of copper and nickel from ammoniacal medium through double supported liquid membranes containing N902 as carrier
Authors: Duan Hengpan , Liu Hongpan , Chen Wei
Published: March 2020

In this paper, simultaneous recovery and separation of copper and nickel from ammoniacal medium through double supportedliquid membranes containingN902 as carrier were investigated. The results show that copper was continuously transported across double membranes, but nickel only was transported throughone of them. Therefore, more than92.4% of nickel and 94.0% of copperinthe mixed feed phase wereseparated into the twodifferent strip phaseswitha transporttime of 30 hoursunder the conditions:6 g/L and 180 g/L H2SO4 solutions as two different strip phases, 100 mg/L each of two metals dissolved in 2.0 mol/L total ammoniacal solution as the feed phase, and 25 vol.%N902 as the carrier in two membranes.
Evaluation the ecological water demand of Dongting Lake based on ecological hydrology during the storage period
Authors: Dai Lingquan , Liu Haibo , Li Wei. , Tang Zhengyang
Published: March 2020

This paper is aimed at evaluating the ecological water demand of Dongting Lake in the middle reach of Yangtze River. Since Dongting Lake has evolved into a lake area connected by three waterways: Eastern Dongting Lake, Southern Dongting Lake and Western Dongting Lake, the ecological water level and ecological water demand of different lake areas must be obtained separately. In the Eastern Dongting Lake, we choose Lujiao station as the water level representative station, and choose Yingtian and Yangliutan station as the water level representative station in Southern Dongting Lake, and choose Nanzui and Xiaohezui station as the water level representative station in Western Dongting Lake. The natural water level data is used to obtain the ecological water level in different lake areas of Dongting Lake based on the ecological hydrology method, and then the ecological water demand is obtained through the lake water level-volume relationship curve. The ten-day average minimum ecological water demand of Dongting Lake from September to October is 6.042, 5.294, 4.095, 3.548, 3.139, 2.864 billion m3. The determination of the minimum ecological water demand of Dongting Lake provides a scientific basis for defining the safety status of the lake ecosystem.
Experimental study on phase behavior of heavy oil-solvent mixture system
Authors: Zhang Yanyu , Liu Yunlong , Sun Xiaofei , Wang Xiangyu , Gong Hangfei
Published: March 2020

Phase behavior research is of great significance for formulating oilfield development plans. In this paper, an experimental procedure was proposed to investigate the phase behavior of a solvent mixture(5 mol% CO2+45mol% CH4+55 mol% C3H8) withVenezuela Orinoco heavy oil. The measured physical properties of the heavyoil–gaseous solvent system include the bubble point pressure, swelling factor, density and viscosity of the liquid phase as a function of gas mole fraction. The experimental results show that as the gas molar fraction increases from 10% to 30%, the bubble point pressure and swelling factor of the heavy oil-solvent mixture system increase accordingly; as the dissolved gas content in the heavy oil increases, the viscosity and the densityof the system is reduced, but the reduction is getting smaller and smaller.
The Impact of Urbanization Development on the Meteorological and Environmental Elements in the Central Cities of Liaoning Province
Authors: Wang Yangfeng , Lu Zhongyan , Zhao Hujia , Ma Yanjun
Published: March 2020

Based on the meteorological and environmental data on Shenyang, Anshan, Fushun and Benxi and the data on urbanization indexes in central cities of Liaoning from 1992 to 2012, this paper analyzes the law of annual changes of urbanization indexes and meteorological and environmental factors in central cities of Liaoning, and studies the influence of urbanization development factors on meteorological environment factors through correlation analysis, grey correlation analysis and the GM (1, n) model. Then the important influence factors are selected. The results show that the main urbanization factors affecting the wind speed, temperature, humidity and other meteorological factors in the central cities of Liaoning Province are the completed area of houses, population density, smoke and exhaust emissions, road length and so on. The urbanization factors that affect PM10, SO2, NO2 and other environmental factors mainly include the emission of smoke and gas, the total amount of water supply in the city, the completed area of houses and population density. The main influence factors of urbanization are different among in central cities of Liaoning. The fitting results of the GM (1, n) model show that there has a close relationship between urban development factors and meteorological and environmental factors. In addition, the GM (1, n) model has a high precision, which also shows the superiority of the GM (1, n) model in the application of urban multi factor correlation system.
Study on Dormancy Stage of Winter Bud of Grape
Authors: Fang-Liu  , Li Jing-Bai , Chao-Liu  , Wu San-Lin , Chang-Liu  , Wang Hang-Fei
Published: March 2020

Winter bud dormancy of grape cultivated in high temperature, humidity and low solar radiation areas of Sichuan Province experienced three stages of similar dormancy, internal dormancy and ecological dormancy. Around mid-October, it is the similar dormancy stage, and from mid-October to late-December, it is the internal dormancy stage. In early January, it enters the ecological dormancy stage,2.5% cyanamide treatment could break the dormancy of winter buds of ‘Summer black’ and ‘Xiangyue’ grapes.
Study on the Internet of things system for dust migration control on excavation surface
Authors: Gong Xiaoyan , Cui Jian , Zhu Bin
Published: March 2020

In view of the current situation of serious dust over limit and low intelligence level in the integrated excavation face, combined with the smart control device of wind flow developed in the laboratory, an intelligent control system of wind flow in the integrated excavation face is developed based on the Internet of things technology. This paper presents the realization method of the system hardware and the development process of the software. The system collects the sensor signals and remotely transmits data from the intelligent control device for the wind speed, gas, dust and wind current at the fully mechanized working face, and the remote transmission of data. The device performs automatic control to achieve real-time regulation of dust movement.Finally, the software and hardware system is applied to the intelligent adjustment test platform of local ventilation equipment in coal mine for testing. The test results show that the system runs smoothly, the data is accurate and the operation is simple.
Review of Environmental Safety Research Based on Systematic Mapping Study: Taking CNKI Database as an Example
Authors: Tu Xiaojian
Published: March 2020

This paper applies the Systematic Mapping Study (SMS) to the review of environmental safety research in China. Different from the traditional systematic literature review, this study focuses on the classification and analysis of related literatures to form a number of quantitative, systematic visualization images to identify the current status and gaps in the research field. The paper follows the SMS analysis steps, takes the literature related to environmental safety research in recent 3 years from CNKI database as the analysis sample. SMS method is used to systematically analyze the publication trends, research types and research contributions, which offers a visual summary map of the field. The research results show that the SMS method can reflect the status quo of environmental safety research and identify research gaps efficiently and accurately, and can put forward targeted opinions accordingly.
Dechlorination effect of slow speed elution on municipal solid waste incineration bottom ash
Authors: Lu Peng , Xing Li-Nan , Cao Qi-Quang , Zhang Ai-Jia , Zhang Xiao-Hui , Xie Guo-Li , Zheng Ming-Yue , Yuan Yuan , Chen Hong-Mie , Yang Dong-Qing
Published: March 2020

The bottom ash, accounting for 20% to 30% of the original living garbage, has been a large content source of municipal solid waste in China and incineration treatment becomes the most important garbage disposal method. The water-soluble chloride ions will be released to the environment by the eluent produced from the bottom ash. It has a negative influence on bottom ash treatment and reuse. This study analyzed the changing of residue of chloride ion, ammonium nitrogen, pH value during the elution process by the column simulation experiment. The dechlorination investigation may improve the commercial application of bottom ash by revealed the regular of chloride ion migration under the condition of slow speed elution.
Simulation Study on Transmission Line Fault and Traveling Wave Transmission Characteristics
Authors: Qin Xiujun , Huang Feng , Huang Zhidu , Mo Zhiyue
Published: March 2020

Fault traveling wave characteristics and traveling wave transmission characteristics are the key factors affecting the positioning accuracy of traveling wave positioning technology. This paper takes a common 110 kV transmission line as the research object, establishes the electromagnetic transient simulation model through ATP-EMTP software, and simulates the lightning strike, lightning shielding, metal grounding and high resistance grounding faults of the line, and obtains the difference of fault traveling wave current and voltage characteristics under different types of faults. On this basis, the attenuation law of each modulus traveling wave is studied. Finally, the application of each modulus traveling wave in fault location is analyzed.
Mechanism Analysis and Experimental Study on Tree Faults in Transmission Lines
Authors: Liu Zhenyao , Gao Song , Jiang Haibo , Guo Rong , Kang Yubin , Chen Xuan
Published: March 2020

It is difficult to reclose transmission line successfully after tree fault occurs, which is easy to cause line outage. At present, most of the existing research focuses on the diagnosis and disposal of tree faults, while the mechanism of tree faults is relatively rare. Firstly, the formation process of tree faults and the typical discharge characteristics at different tree height stages are analyzed. Then, the process of tree-wire gap discharge at different stages is simulated in laboratory environment. With trees approaching transmission lines, corona discharge, hidden discharge and flashover discharge occur in turn, and the discharge increases from weak to strong, and the amplitude increases, while the frequency of discharge waveform tends to decrease.
Design and Research of Power Grid Equipment Supply Chain Based on Blockchain Technology
Authors: Tang Xueyong , Li Qingsheng , Liu Qisheng , Xue Yi , Liu Yan , He Xianggang , Wang Longyang , Qu Haoyue , Tao Bingquan
Published: March 2020

The comprehensive construction of the ubiquitous power Internet of Things has been determined to the current core task by the State Grid Company. Power equipment supply chain is an important part of ubiquitous power Internet of things. Its operation efficiency is directly related to the operation efficiency of ubiquitous power Internet of things. In order to solve a series of problems in the operation of power equipment supply chain, such as lower efficiency of equipment supply chain, higher supply cost and poor stability of supply chain, due to the characteristics of information asymmetry, incompleteness and time lag. The block chain technology is introduced into the supply chain of power grid equipment. A multiple linear regression model is established to analyze the economic value of the system, and the stability of the system is analyzed by combining the basic characteristics of block chains. The feasibility of the theory is verified by case analysis. The results show that the supply chain of power grid equipment based on block chain technology can reduce the equipment purchase cost of power grid enterprises and improve the stability of equipment supply chain.
Stability coordination control of multi-resource integrated microgrid considering demand response
Authors: Sun Leping , Han Shuai , Wu Wanlu , Guo Xiaoxuan
Published: March 2020

Fully exploit the demand-side resources to build a multi-energy complementary microgrid system, which can improve the stability control of multiple indicators and save system operating costs. Based on the microgrid architecture including gas turbine generator set, energy storage system and central air-condition, each part of the system model is constructed to study the complementarity between resources, and a multi-resource integration multi-user regulation configuration method is proposed. Based on the principle of reverse thrust control, the multi-objective stability coordination control strategy of the microgrid system in off-grid mode is proposed, and the stability of the controller is proved theoretically. The control algorithm is verified by a simulation example. The result shows that the coordinated controller can ensure the tracking and adjustment of multiple controlled quantities such as power angle and frequency of the microgrid system during control, and the system can be quickly pulled back to stable operating state after the control is over. The participation of demand response resources in micro-network regulation can effectively improve the dynamic response of each state quantity of the system, and improve system stability, and reduce system control expenditure.
Experimental Study on High Frequency Pulse Current Variation Characteristics of Pollution Discharge of Insulators
Authors: Zeng Huarong , Tan Fali , Mao Xianyin , Zhang Lusong , Luo Guoqiang , Huang Huan , Lu Jinke , Zhang Qiangyong
Published: March 2020

Pollution flashover of insulators is an important factor causing trip of transmission lines and even large-scale blackouts of power grids. At present, the research on pollution discharge of insulators mainly focuses on leakage current monitoring, while leakage current detection mainly focuses on the low-frequency components of the discharge process, and the research on high-frequency discharge characteristics is rare. In this paper, the voltage is monitored based on the coupling capacitance partial voltage method. The high-frequency current is monitored based on the Rogowski coil principle. The characteristics of high frequency pulse discharge in safety zone, forcast zone and danger zone are analyzed. The results show that the pulse amplitude and repetition rate increase significantly with the increase of discharge. The statistical law of high frequency pulse current can reflect the severity of pollution discharge and realize early warning.
Research on the Low Voltage Ride Through Capability of Hybrid Modular Multilevel Converters
Authors: Huang Zhisong , Lv Dianshun , Wang Lipeng , Wu Xin , Ma Qiang
Published: March 2020

With the increase of the penetration rate of wind power in the power system, the latest grid-connection rules require that the inverter of Wind Turbine should have the capability of low voltage ride through (LVRT). This paper aims at a Wind Turbine based on hybrid modular multilevel converter (MMC). Firstly, the mathematical model of the system is established in the stationary coordinate system. In order to ensure that the Wind Turbine can operate without network disconnection during grid fault, this paper adopts a corresponding hierarchical control strategy, the strategy applies to hybrid modular multilevel converter and provide control flexibility, and realize the LVRT of a Wind Turbine, an electromagnetic transient model of the hybrid MMC based Wind Turbine is simulated in PSCAD/EMTDC and the results verify the feasibility and effectiveness of the proposed scheme and control strategy.
Practices and Enlightenment of Domestic and Foreign Demand Response in Electricity Market
Authors: Han Shuai , Wu Wanlu , Guo Xiaoxuan , Sun Leping
Published: March 2020

With the increasing proportion of intermittent power supplies and large capacity generator set, demand response based on excitation and price is widely concerned for improving the flexibility of system operation scheduling. The development of demand response in the electricity market is in the ascendant in the world, and the market mechanism can be better designed by fully drawing on existing experience. This paper comprehensively analyses the released relevant policies, technical standards and implementation of existing pilot projects of domestic and foreign demand response in electricity market, summarizing the research focus in recent years, learning the experience of the existing demand response project and combining the current situation of the power market revolution, then put forward some suggestions to develop the mechanism of demand response in electricity market.
Comparative Analysis of Two Actuators for High Voltage Bypass Switch
Authors: Jiang Jinghua , Zhang Hongtie , Sun Yingjie , Zhao Jianlei , Zhu Yu , Zhang Liyan , Dong Enyuan
Published: March 2020

The bypass switch is required to complete the closing operation quickly and accurately protect the transmission line. Therefore, there is a high requirement for the actuator of the bypass switch. According to the characteristics of the bypass switch, the commonly used actuators are compared, and the magnetic force actuator and the motor actuator are initially selected to meet the requirements. Firstly, the characteristics of the magnetic and motor actuator are compared and analyzed in principle. Then, the optimization model of the two actuators is obtained through simulation optimization. Under the same working voltage, the action characteristics of the two actuators, including the action speed, the start time and the output force, are compared. Finally, a comprehensive reference for the selection of the bypass switch actuator is provided.
Phase-controlled technology for bypass switch of UHV series compensation
Authors: Tan Shengwu , Wei Jianwei , Zhang Liyan , Zhang Chaojun , Zhang Yinsui , Zhu Yu , Dong Enyuan
Published: March 2020

The large inrush current occurs when the series compensation capacitor bank is cut off. The inrush current can be effectively suppressed by the phase-controlled technology. The controlled closing strategy for the bypass switch of the series compensation capacitor bank is developed in this paper. The UHV transmission line and capacitor series compensation are established. The arc model of pre-breakdown and time scatter model are established. The closing strategy is simulated in the MATLAB/Simulink. The simulation results show that the closing strategy in this paper can effectively suppress the inrush current of the bypass switch.
Research on High Voltage Power Line extraction based on Transmission Line Point Cloud characteristics and Model fitting
Authors: Yang Yuan , Yang Heng , Zhou ZhenFeng , Yang LiuGui
Published: March 2020

High-voltage power line digitization is one of the key contents of intelligent inspection of transmission line. Airborne LiDAR has obvious advantages in three-dimensional digital reconstruction of high-voltage power line. In this paper, a power line extraction algorithm for transmission line corridor based on LiDAR point cloud data is proposed. According to the distribution characteristics of point clouds in transmission line corridors, rough extraction of power lines is carried out. Noise points are eliminated by improved Hough and RANSAC parabola fitting method. Then the power lines are segmented horizontally and vertically. According to the vertical parabola model of a single power line and the straight line model of water surface, the complete power lines are extracted by model growth algorithm. Line point. The experimental results show that the accuracy of the proposed algorithm is 99.6%.
Research on the Market Pattern and Evolution of Integrated Energy Service Market in the Commercial Ecology of Ubiquitous Power Internet of Things
Authors: Siwu Li , Wei Zhang , Xi Chen , Jing Wan , Yuxin Zou
Published: March 2020

The introduction of UPIoT (Ubiquitous Power Internet of Things) has brought new opportunities and challenges to the entire energy production industry, and also brought new development space for the IES (integrated energy services) market. This paper analyzes the commercial ecosystem of the UPIoT, based on its core technology architecture and the intrinsic association between UPIoT and IES. This paper also analyzes the pattern of the integrated energy service market, classifies the main body of the integrated energy service market, studies different types of IES market competition and the evolution path of market development.
Interval prediction of photovoltaic power generation based on cloud theory
Authors: Zhao Haibo , Dong Xiaoyang , Wang Ai , Wang Zheng , Zhang Yanhui , Zhang Zhi , Dong Xia , Song Xiaojun , Wang Yaju , Xing Yahong
Published: March 2020

With the increasing integration of photovoltaic power into the power system, the reliable photovoltaic power generation prediction is of significant to the security and economics of the power system operation. However, the prediction deviation is unavoidable, therefore this paper presents an interval prediction model for the photovoltaic power generation based on cloud theory. Based on the error analysis of the photovoltaic power prediction, the training samples can be selected to establish the cloud model for each small power generation bin. In this way, the predictive cloud distributions for different predictive power generation can be obtained to generate the prediction intervals at each time slot. To take the photovoltaic power plant in German as example, the proposed model is validated. The results show that the proposed model outperforms the other benchmark method. And the calculation process of the proposed model is simple and short in computation time. The analysis results are expected to be used in the field of power grid dispatching and decision making.
Fire and blast resistance analysis of the firestop system of valve hall in UHVDC converter station
Authors: Zhong Bo , Zhao Chang-Zheng , Zhang Ze-Jiang , Jiang Ya-Qiang , Zhang Jia-Qing , Liu Xiao-Sheng , Huang Hao
Published: March 2020

The ultra-high voltage direct current (UHVDC) converter station is the core of the UHVDC project to realize the mutual conversion of alternating current (AC) and direct current (DC). Its operational reliability directly affects the safety of personnel and equipment and the stable operation of the grid. The firestop system is key part of the protective system in converter station, and it faces the threat of fire and explosion of converter transformer. In this paper, in order to analyze the shortcomings of the existing firestop system of valve halls, numerical models for fire and blast resistance analysis of typical firestop system are established. For a typical UHVDC converter station, the temperature distribution under hydrocarbon heating curve and dynamic response under different blast loads are analyzed by using the established numerical model. And the results show that the existing firestop system has good heat insulation performance, while the blast resistance cannot meet the demand.
Credit Risk Evaluation and Analysis of Power Generation Enterprises under the Spot Trading
Authors: Wei Zhong-Kang , Ning Bo , Zhu Tian-Bo , Niu Jia-Qiang , Liu Jun
Published: March 2020

China’s economic development has entered into a stage of “new normal”, with the market-oriented reform of electricity is deepening, the market risks faced by power generation enterprises are becoming increasingly severe. To reduce the loss caused by market risks and promote the efficiency of market operation, this paper established and evaluated the credit evaluation system for power generation enterprises. Specifically, based on spot power trading market, this paper firstly established a credit risk evaluation index system by assessing the credit risk of market trading members from four main aspects; then, the credit risk of typical enterprises has been analysed by fuzzy synthetic evaluation method. The result showed that power generation enterprises should focus on improving their financial ability such as profit and debt repayment in the operation process, attention should also be paid to integrity due to improving the performance rate of spot trading in the transaction process.
Economic Dispatch of Micro-grid Based on SQP—Validation and Results
Authors: Xu Bo , Zhang Yumin , Zhu Zhengyi , Zhang Xinyi , Miao Xiaofeng , Liu Jingyu , Wang Zhen
Published: March 2020

An economic dispatch strategy of micro grid based on sequential quadratic programming is introduced and formulated in the authors’ former paper in the context of mathematical model and formulations. In this paper, a small micro grid system in Yantai City, established by Shandong Electric Power Company, is used to investigate the performance of the proposed model in more detail. The results show that: in the independent micro grid operating mode, when the load is small, the operating costs of micro grid have a large difference before and after the control. In the grid-connected operation mode, the micro grid generates as recommended is more economical than full-power generation. Therefore, this paper can achieve the optimal output of each micro source and the economic operation with satisfying the load requirements.
Study on the deflection control of suspended tubular bus in 750kV transformer substation
Authors: Ai Xiancang , Feng Yugong , Zhang Xiaowen , Lu Xinwei , Chen Kai , Yang Junfen , Liu Chuanjiang
Published: March 2020

Because of the large span between bus bars and the big diameter and heavy weight of tubular buses, it has been a difficult issue to control the deflection of buses for the 750kV power distribution unit. Based on the hanging test on suspended tubular buses and the actual conditions in spot, finite models were established with different support types and rigidities to simplify the true hanging points and provide an effective reference for the optimization design of suspended tubular buses.
Classification of GIS Based on Adaptive Neural-Fuzzy Reasoning System
Authors: Lu Yufeng , Su Yi , Liang Zhaoting , Lu Yifan , Huang Jinjian
Published: March 2020

Partial discharge (PD) measurement is one of the most important diagnostic methods for the insulation system of high voltage equipment, which is convenient to evaluate the insulation state. Partial discharge activity may originate from various defects and exhibit different behaviors accordingly. Here, three PD patterns generated by different laboratory models representing GIS defects are recorded and analyzed. The purpose of this study was to conduct PD test with three GIS devices including prefabrication defects. statistical features are extracted from PD pattern data and reduced by linear discriminant analysis (LDA). the adaptive neural fuzzy inference system (ANFIS) was used to train the fuzzy inference system (fis). the proportion of trained fis used for ANFIS classification was as high as 95.83%.
Research on ammonia injection optimized adjustment test of selective catalytic reduction denitration device for 600MW coal-fired unit
Authors: Guo Liqiang , Liu Fengchun , Yan Hanbing , Chen Xiufang , Xu Liquan
Published: March 2020

After the ultra-low emission reform of the coal-fired power plant, the ammonia slip at the outlet of the Selective Catalytic Reduction(SCR) denitrification device increases, resulting in abnormal air preheater resistance, which affects the economic and safety of the unit. The optimized adjustment test was carried out on the ammonia injection system of the SCR denitration device for 600 MW coal-fired unit. Under the premise of meeting the ultra-low emission of the unit, the NOx and ammonia escape at the outlet of the denitration device are controlled by adjusting the ammonia injection manual door to reduce the NOx distribution deviation of the outlet. The test shows that the standard deviation of the NO concentration distribution at the outlet of the reactor A reduced from 27.72% before adjustment to 12.53% after adjustment. The standard deviation of the NO concentration distribution at the outlet side B decreased from 55.78% before adjustment to 14.52% after adjustment. The uniformity of the NOx distribution in the outlet zone of the reactor is significantly improved, thereby effectively controlling the escape of ammonia.