Apr 2021 / by MADHAB MONDAL
Abstract: Landforms are the core concept of geomorphology. The definition of landforms, their characterization and classification are the core subject of geomorphology. But all these become complex when it seems to difficult to identify the landforms, especially when the area is plain land and highly modified by human activities. This paper has examined the characters of the landforms of the middle basin of the Ichamati river, the important distributary in the district of North 24 Parganas, India. It has been primarily taken an attempt to classify the landforms with the help of the satellite
image, IRS P6 LISS II and LISS III. The DEM is not enough to identify the micro scale landform. To overcome this difficulty a series of field works have been conducted (2002, 2004, 2012 and 2015). The landforms have been classified according to second order derivative (Wood, 1996) method. Then ANOVA test has been applied to justify the classification. The F-statistics have indicated the effort is satisfying. The changing character of different landforms denote the river is going to be deteriorating from downstream upward.
Keywords: Landforms, geomorphology, classification, DEM, fieldwork, second order derivative, ANOVA.
Apr 2021 / by
Development of an early warning and planning system for Pathways to sustainable energy
The Pathways to sustainable energy project (Pathways) focuses on the sustainable development of energy supply for the benefit of society in the UNECE region. The project defines three pillars of sustainable energy: 1. Energy security, in particular, the security of supply 2. Energy and environment, in particular, the environmental impact of energy supply and use 3. Energy for quality of life, in particular, to ensure that social and societal development is positive, and that economic growth generates prosperity These pillars are considered over time periods of several decades in order to
capture suitable time horizons associated with climate change, technology development and deployment and economic development.
Apr 2021 / by SURAJ SAYED J, SREERAM P V, R. RAMESH KUMAR
Abstract: A domestic purpose micro wind turbine realised using bamboo blade is tested for the power generation at an interval of two years and compared the performance. A CFD analysis of turbine with five blade system is carried out for an average wind velocity of 2.5m/s and structural integrity of the
bamboo blade unit based on the pressure distribution is assessed. For the input wind velocity, a stream lined out flow of 5.9 m/s is found when wind turbine rotates at 300 rpm and corresponding pressure distribution is found to be maximum at the expected location of blade tip as 129 Pa. The
static analysis shows a good margin. For 2.5 m/s, the wind turbine generates an average value of 3.8V with 0.25A (based on 15/ 10W load). The wind turbine has produced nearly the same power even after a period of two years.
Apr 2021 / by K. GANESAN
Abstract: As solar power continues to grow, plant automation and control becomes more important. It comprises all the necessary intelligence to turn the solar energy into a reliable and flexible power source. As leading automation provider, field proven PLC (Programmable Logic Controllers) and SCADA (Supervisory Control and Data Acquisition) system accompanied by dedicated control and diagnostics functions assure reliable power production and grid code compliance at all times.
Feb 2021 / by
Strategic Options For Countries To Achieve Energy For Sustainable Development
Note by the UNECE secretariat
Jan 2021 / by SHIYANG ZHU and LE WANG
Abstract: Overhead transmission lines are important parts of a power system; their operation state directly affects the reliability level of the entire power system. With the in-depth development of state maintenance work for power grids, correctly evaluating the reliability of overhead transmission lines
is the key to successful maintenance. A maintenance decision model for transmission lines is established in this study based on set pair analysis to achieve human financial control and low maintenance efficiency. Full consideration is provided to the influence of environmental factors, and
a theoretical basis for transmission line maintenance decision is established.
Keywords: Overhead transmission line, state maintenance, set pair analysis, reliability
Jan 2021 / by GENGHUANG YANG, WENBIN SUN , XIAYI HAO , YINGMEI ZHANG , LI YANG and YANQIU CHE
Abstract: Small hydropower station, when producing power energy to power system through the distribution network, may lead to the change of the detected current in relay protection and the protection coverage. In this paper, IEEE7 based network is formed in the platform of PSCAD/EMTDC to analyze the effects of distribution network in current protection when a small hydropower station is linked in. The running of relay protection in Section I and II is simulated to obtain the difference of current variation of network with or without small hydropower station. Also the key parameters are calculated to point out the maximum generation capacity of the small hydropower station in case of reliable and sensitive current protection.
Keywords: Small hydropower station, current protection, generation capacity, PSCAD/EMTDC
Jan 2021 / by JIANG HAIBO JINJIN and QIN ZHIPENG
In order to quantify the migration rule of water in composite lining canal foundation soil during the freeze-thaw process, the outdoor prototype test is performed to prove the change rules of water in different positions and depths of the rigidflexible mixed composite lining canal foundation during the whole freeze-thaw cycle. The prototype observation test shows that during the freezing period, the water content within the 0~80cm depth of the canal foundation soil increases with the depth, and that within the depth of 80~160cm decreases gradually with the depth. In the freezing period, water accumulates in the depth of 60 ~ 80cm, with a maximum water transfer amount of +13.2%, which occurs at the canal bottom. In the thawing period, the maximum water content also occurs at the canal bottom, with a maximum water transfer amount of -11.0%. Through the laboratory test of soil samples, the water migration development and change rules of the canal foundation soil, under different moisture contents and temperature gradients are studied in unilateral pattern. In the case of the same top plate control temperature, soil samples with similar initial water contents have similar water transfer amounts. The samples with higher initial water content have higher water transfer amount, with higher water accumulation, normally accumulating in the depth of 16~18cm. The results indicate that high water contents make it easy to gather water in soil samples during the
Keywords: Composite lining canal, freeze-thaw test, water migration, water accumulation
Sep 2020 / by WANG PENG, XIAO XIANGNING, XIE BINGSHAN, SU XUEYUAN
Abstract: For households, water supply, power supply, pipeline gas and centralized heating are
necessaries to maintain the normal life of a family. For Chinese urban families, water, electricity, gas,
warm services are often provided by different government utility companies. Aimed at the shortage
of the manual measurement of the above mentioned services‘ consumptions, a new mechanism using
network metering devices is proposed in this paper. Based on the general network measurement
mechanism and through analysis, this paper proposes using meter communication network as the
public communication network of various metering devices, forming wireless mesh network by
metering devices, constituting a virtual private network by the power company’s network, and
accessing to metering network based on SCEP protocol and certificates of devices. Under this new
network measurement mechanism, a network routing optimization strategy, a data acquisition
protocol based on IPv6 and a mesh network management system are designed, and preliminary
experiments have been carried on. Experimental results show that the proposed mechanism can
realize functions through the network, including the control of multi-measuring devices, topology
discovery, data acquisition, fulfilling the multi-meter data acquisition system via network.
Keywords: Energy internet, four-in-one meters, wireless mesh network, virtual private network, SCEP.
Sep 2020 / by ZHIBIN LIU, XIN WANG, AISHENG REN
Abstract: Biomass power generation has characteristics of good quality of power generation, high
reliability and mature technology. It plays significant aspects in maintaining the safety of energy,
optimizing energy structure, alleviating environmental pollution and promoting the economic
development in the rural areas. Analyzing the investment of biomass power generation in China
systematically cannot only improve the scientificity of the investment process, but also guide the
industry to develop rapidly and healthily. At present, the investment areas of agricultural biomass
power generation projects are too concentrated and the fuel supply is difficult, which affect the
normal operation of biomass power plants and lead to loss or on the verge of profit and loss of biomass
power generation plants. This paper constructed the optimal model of investment location of
agricultural biomass power generation projects using the iterative gravity algorithm based on the key
factors analysis to affect the operation costs of agricultural biomass power plants. The model
optimized the transportation lines and transportation distance, and gained the smallest transport
costs of power generation materials after a few iterative calculations. This paper took Huantai County
as an example, and determined the optimal investment location of agricultural biomass power project
using the Region props toolbox of Matlab 7.4. The simulating calculation of Huantai County showed
that the results given by this model are reliable, and this method to select the investment location of
agricultural biomass power projects is feasible and effective.
Keywords: Agricultural biomass power generation projects, investment location selection, optimized
iterative gravity method, Huantai County.