implement changes in people processes and systems to improve data quality
Mô hình triển khai IPTV của VNPT tại Hà Nội và giải pháp nhằm nâng cao chất lƣợng dịch vụ VNPT’s IPTV Implementation in Hanoi and Solutions to Improve Service Quality
Ngày tải lên :
26/11/2013, 20:44
... Access Internet STB (Set Top Box) IPTV Lưu ý dùng cáp DMI ivi hỗ rợ D v khách h ng đăng ký dùng gói D (khi lắp STB loại D) Hình 2.6: Dịch vụ MyTV cung cấp đồng thời với dịch vụ truy nhập Internet ... chấp nhận (Poor) 20-40 MPQM Kém (Bad) 0-20 video đƣợc trình Quality Metrics) bày cho ngƣời thực giá QoE khách (Moving Picture V-factor mơ hình để đánh giá QoE dịch vụ IPTV MPQM khơng cần đến ... “Bad” tƣơng ứng thang điểm V-factor triển khai dựa mơ hình gốc MPQM Tuy nhiên, ngồi việc “cho điểm” đánh giá chất lƣợng hình ảnh, V-factor cung cấp thêm thơng tin cần thiết cho việc theo dõi phân...
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Work placement report: Recruitment in Thang Long postal insurance company and recommendations to improve the quality of recruitment
Ngày tải lên :
28/05/2014, 10:14
... original insurance business •Health insurance and personal accident insurance •General Liability Insurance; •Motor Vehicle Insurance; •For fire and explosion Insurance; Re- insurance business: ... ON TO IMPROVE THE QUALITY OF RECRUITMENT CASE STUDY ACHIEVEMENTS IN RECRUITMENT Set up the recruiting process The quality and quantity in the recent years • Supporting for managing and using ... of candidates RECOMMENDATION TO IMPROVE THE QUALITY OF RECRUITMENT Expand recruitment source Recruit ment source • Coordinating with universities and colleges • Select outstanding students to...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 1 ppt
Ngày tải lên :
20/06/2014, 05:20
... modeling wind farms consisting of wind turbine units on different time scales, ranging from short (minutes) to long-term (months) simulations, taking into account fluctuating wind speeds and technical ... related to the capability of wind units to work within a power factor range between 0.95 leading and Wind Farm – Impact in Power System and Alternatives to Improve the Integration 0.95 lagging Modern ... thermal, hydro, and nuclear generation and wind power, such as different generation systems and the difficulty in controlling the primary movement of a wind turbine, due to the wind and its random fluctuations...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 2 potx
Ngày tải lên :
20/06/2014, 05:20
... load power to changes in G and B In the area to the right hand side, load has positive sensitivity to changes in G and B, whereas in the area to the left hand side if G and/ or B is increased beyond ... a line and extending it until it intersects the IG circle in Pm The most important thing to note is that the stability 32 Wind Farm – Impact in Power System and Alternatives to Improve the Integration ... loadability in the point of voltage collapse and increase in voltage stability margin define as the distance between the operational point and the point of voltage collapse Finally, column and 10...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 3 pot
Ngày tải lên :
20/06/2014, 05:20
... tool for on-line monitoring and control of power system containing wind farms or any other renewable energy resource Relying on the information and indicators provided by the chart the operator ... turbine, it is necessary to determine how to add each other to assess the overall impact of an installation with several wind turbines 56 Wind Farm – Impact in Power System and Alternatives to Improve ... (Tande, 2002) In this case, the extreme situations to be taken into account are the turbine maximum power generation and minimum power consumption (by other of users), and minimum wind power and...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 4 potx
Ngày tải lên :
20/06/2014, 05:20
... at the output of the 25th wind turbine and at the output of the 30th wind turbine 84 Wind Farm – Impact in Power System and Alternatives to Improve the Integration To quantify the variation of ... wind turbine (red): (a) more detail in the main resonance and (b) more detail in high frequencies 4.2 Frequency response of the offshore wind farm in function of the feeders in its inter-turbine ... feeders (F1 and F2) to feeders (F1-F5), Fig 15 are considered, maintaining the same number of wind turbines for each radial, not the total number of wind turbines of the wind farm In this case, the...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 5 pptx
Ngày tải lên :
20/06/2014, 05:20
... line Main-Wind will reverse the active power flowing from Main towards Wind originally at 6.60 MW to a new flow towards Main at 10 72 MW Whereas the transmission line connecting Wind to Elm increases ... injection the line is unloaded to 66.5 MW in general must lines are unloaded and losses are reduced to 4.66 MW However, lines connecting Main-Wind changes the flow direction of power to wind-main The ... (2011), Incorporation of a Wind Generator Model into a Dynamic Power Flow Analysis, (in Spanish), Ingeniería Investigación y 108 Wind Farm – Impact in Power System and Alternatives to Improve the Integration...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 6 docx
Ngày tải lên :
20/06/2014, 05:20
... upper/lower storage basins init init Ssup , Sinf Final state of of upper/lower storage basins at the end of optimization period finit fin Ssup , Sinf 130 Wind Farm – Impact in Power System and Alternatives ... turbine and pumping in parallel: Phydro (t ).Ppump (t ) = (14) In linear programming, variables are only defined by linear relationships To get to express this constraint we see the need to introduce ... storage capacity in order to better adapt to wind availability It seeks to determine the maximum and minimum storage basins at specific times The horizon of anticipation to be considered has to...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 7 pot
Ngày tải lên :
20/06/2014, 05:20
... captured by the wind turbine under low to medium wind speeds by tracking the desired pitch angle and rotor speed, when the wind turbine system nonlinearities structurally uncertain Concerning other ... non-linear systems with parametric uncertainties and sensor faults; • The powerful Linear Matrix Inequalities (LMIs) approach to obtain fuzzy fault tolerant controller gains and observer gains; ... 2007) and fault identification and compensation for a WECS with doubly fed induction generator (DFIG), has also been done In addition, a survey on failures of wind turbine systems in Sweden, Finland...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 8 pot
Ngày tải lên :
20/06/2014, 05:20
... as input to an ASIG wind turbine inside wind farm WFC Notice that the wind turbine is simulated at an average wind speed 182 Wind Farm – Impact in Power System and Alternatives to Improve the Integration ... for the DFIG 188 Wind Farm – Impact in Power System and Alternatives to Improve the Integration wind turbines, small changes in the rotor speed result in significant changes in the active power ... Rhodes and to the wind farm controller capability to ensure safe operation of the wind farms during different variable load and wind profiles 3.2.1 Turbulent wind speed in wind farms In the following,...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 9 potx
Ngày tải lên :
20/06/2014, 05:20
... Forecasting and Storage-Based Power Quality Regulation in Wind Farms Short-Term Advanced Forecasting and Storage-based Power Quality Regulation in Wind Farms 213 Energy Transmission, and Storage ... integration of wind energy into the electrical grids, especially in autonomous power systems like Rhodes In power systems, like the one studied in this Operation and Control of Wind Farms in Non-Interconnected ... Change in power in different wind turbine configurations during frequency drop – SCENc 200 Wind Farm – Impact in Power System and Alternatives to Improve the Integration Figure 32) Comparing to Figure...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 10 pot
Ngày tải lên :
20/06/2014, 05:20
... Forecasting and Storage-Based Power Quality Regulation in Wind Farms Short-Term Advanced Forecasting and Storage-based Power Quality Regulation in Wind Farms 219 11 Fig Blocks in the modeling and ... Advanced Forecasting and Storage-Based Power Quality Regulation in Wind Farms Short-Term Advanced Forecasting and Storage-based Power Quality Regulation in Wind Farms 217 Fig The Storage and Energy ... (10) Flux Linkages: Equations of motion: where Is, Ir: stator and rotor currents, Vs, Vr- stator and rotor terminal voltages ψs, ψr- stator and rotor flux linkages,Lm-mutual inductance (in per unit...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 11 pptx
Ngày tải lên :
20/06/2014, 05:20
... series in vector form that contains both wind speed and wind direction We next describe our modeling approach to derive a family wind models ranging from short through and long term models Using ... minutes In (Alberto F at el., 2005), the authors propose a probabilistic method to estimate the forecasting error for 248 Wind Farm – Impact in Power System and Alternatives to Improve the Integration ... transformation to normal distribution with mean zero and variance one 250 Wind Farm – Impact in Power System and Alternatives to Improve the Integration This transformation is used in both the fitting and...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 12 potx
Ngày tải lên :
20/06/2014, 05:20
... wind turbines (wind farm) using cage-rotor induction generators is presented using data from a wind farm installed in Denmark The purpose of the model is to simulate the dynamical behaviour and ... wind fluctuation model, which will make the model useful also to simulate the power quality and to study control strategies of a wind turbine Wind turbine modelling In order to simulate the wind ... constant-speed wind turbine using induction generator The simulations shown in Fig illustrate the effect of the rotational sampling This hub wind speed is used as input to the rotor wind model to produce...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 13 potx
Ngày tải lên :
20/06/2014, 05:20
... mean wind speed was modified to 18 (m/s) and at t=170 seconds mean wind speed was modified again at 11 (m/s) to simulate sudden changes in wind speed and to test the system performance and implemented ... MW Fig Single line diagram of the MRTS 298 Wind Farm – Impact in Power System and Alternatives to Improve the Integration Wind energy conversion system model 3.1 Modeling and simulating wind speeds ... each wind turbine control including soft starter start-up, and power factor compensation The above presented model can be a useful tool for wind power industry to study the behaviour and influence...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 14 pptx
Ngày tải lên :
20/06/2014, 05:20
... (hourly changing mean speeds, state chart modelling within the turbines) and agent-based modelling (e.g of the failure behaviour and for the integration of the turbines into the wind farm) The ... component using an average hourly wind speed as input The input signal vh (t) is superposed with some 320 Wind Farm – Impact in Power System and Alternatives to Improve Will-be-set-by -IN- TECH the Integration ... Wind Farm – Impact in Power System and Alternatives to Improve Will-be-set-by -IN- TECH the Integration Wind Speed (hourly) Wind Speed (hourly interpolated) Wind Speed (continuous) 20 18 16 v [m/s]...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 8 doc
Ngày tải lên :
20/06/2014, 05:20
... converts kinetic energy from the wind into electric energy In dependence on the rotor diameter, defining an area S swept by the rotating blades, the machines are divided into small, medium-sized and ... by setting the rotor blades into smaller angles and thus reducing the lift force, increasing the resistance and causing a drop in output, the so-called “active stall“ regulation The turbines regulated ... down to 340 CZK/MWh in 2009 and to 2230 CZK/MWh in 2010 and nowadays, but still permits a profit-making construction and operation of wind farm projects Since then, the construction of wind farms...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 9 doc
Ngày tải lên :
20/06/2014, 05:20
... the wind turning the pinions that reach into the dents of a yaw bearing placed on the top of the tower The bearing system of positioning up the wind is a sliding bearing system with a built -in ... energetics in Europe The development has been manifested by: • increasing the WT output per unit due to a growth in rotor diameter, • increasing the WT tower height and reducing the adverse influence ... characterizing the resource This chapter will discuss this first stage in detail, outlining the state of the art in understanding the wind resource, and discussing the strengths and weaknesses of existing...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 10 pdf
Ngày tải lên :
20/06/2014, 05:20
... last decade, and is projected to expand and continue to play an ever-increasing role in electrical production around the world Improved understanding of the resource, and in any inherent non-stationarities ... existing research has illuminated two areas of potential improvement First, continued improvements in the wind PDF modeling, including, for example, adopting approaches from other disciplines, ... However, factors such as access to transmission lines and interactions between wind farms also play a role in siting decisions In particular, transmissions costs and constraints are likely to generate...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 11 pdf
Ngày tải lên :
20/06/2014, 05:20
... in interaction with the foundation soil, is modeled by approximation using equivalent springs (torsion and linear springs) Figure provides a comparison between wind turbine generator system and ... of Total System Cost Medium Percent Cost Rotor blades to 11.2 7.1 Gear box and generator 13.4 to 35.4 24.4 Hub, nacelle and shaft 5.3 to 18.4 Control system elements 4.2 to 10.2 7.2 Tower 5.3 to ... Geological investigations: geophysical methods have a major role to play in mapping stratigraphy, determining the thickness of superficial deposits and the depth to engineering rockhead, establishing...
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