stability is normality in educational psychology and cognitive flexibility is the exceptional case
The Emergence of the “I” Reflections on the Use of Qualitative Research Methods in a Master´s Program in Educational Management and Leadership at the VNU University of Education
... focus is the appearance of the ´I´ as it emerges in the reflective dialogue and in the activities in the backstage I begin with the work of Ms., a teacher of English and the head of the English ... long hours with the students in the seminar room and/ or at the local coffee shop discussing and dissecting their texts These sessions - which involved two supervisors, the student and a colleague-translator ... energy and determination - was an important “engine” for the data produced While this personal input was sometimes slow in coming in both seminars and in the context of supervision, when involved in...
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LONG TERM CHANGES IN VOTING POWER AND CONTROL STRUCTURE FOLLOWING THE UNIFICATION OF DUAL CLASS SHARES pdf
... business groups in Israel: Their impact at the level of the firm and the economy Israel Economic Review 5, 55-93 Kosenko, K and Yafeh, Y (2009) Business groups in Israel, in A Colpan, T Hikino and ... descriptive statistics for unifying and non-unifying firms The median unifying firm is smaller than the median non-unifying firm (although this is not the case for the sample means); unifying firms ... variable is a dummy variable that takes the value of one if the firm is included in the sample of unifying firms and zero if it is included in the control sample, not identify systematic and statistically...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 1 ppt
... comparison of the conventional deterministic N-1, the basic probabilistic and the joint deterministicprobabilistic criteria is illustrated for a long-term composite system planning using a wind integrated ... turbine existing in a wind farm Chapter 13 presents the application of a joint deterministic-probabilistic criterion for bulk system expansion planning in wind integrated systems A comparison ... transformers connection and leakage inductance or interturbine grids configuration The analysis is performed from the point of view of the wind turbines, considering them as potential harmonic...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 2 potx
... solution at the stability limit is determined by the intersection point of the P- locus, the Q locus and the BL In other words, if the intersection point of the P-locus with the BL and the intersection ... 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 show the ... MVA.n, and Zeq=Z/n MVA is the rating of one IG, n is the number of IGs in the farm, and Z stands for all impedance parameters of one IG A Thevenin equivalent is determined at the WF terminal using...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 3 pot
... correlated This is the most appropriate value to wind farms since, in principle, the disturbance of each turbine is independent of the others This means that, in the usual case all the turbines are ... component of the network and the reactive power in the reactive component Thus, in weak grids, predominantly resistive, as is the case of the typical MV distribution networks, the active power is the ... coincident and for those other cases in which the probability of occurrence is very high Value is used in cases in which the coincidence is just as likely as that of random noise That means that the...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 4 potx
... frequency is mainly in function of the characteristics of the submarine cable (its capacitive component) The main resonance of the AC offshore wind farm from the viewpoint of the wind turbines is the ... radials) in the inter-turbine grid or the location of each wind turbine The analysis is made from the viewpoint of the wind turbine, which is considered the potential harmonic source in normal ... of the harmonic voltage source inside the inter turbine grid For the 25th wind turbine (black) and for the 30th wind turbine (red): (a) more detail in the main resonance and (b) more detail in...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 5 pptx
... where V is the voltage, P is the real power, X is the sum of the stator and rotor reactances, Xc is the reactance of the capacitor bank, Xm is the magnetizing reactance, and R is the sum of the stator ... However, lines connecting Main-Wind changes the flow direction of power to wind-main The new transmission line Main-Wind will reverse the active power flowing from Main towards Wind originally at ... variability of wind energy is due to the intermittent nature of wind and the process of converting wind energy into electrical energy The wind speed is constantly changing This is a climatic phenomenon,...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 6 docx
... When the problem consists of continuous and discrete variables (integer or binary), Linear Programming extends to the Mixed Linear Programming (MLP) or Integer Linear Programming (ILP) In the ... (19) init Sinf (t = 0) = Sinf (20) fin Sinf (t = T ) = Sinf • (18) (21) The temporal evolution of the state of available storage is calculated by examining the input and output powers of the basins: ... Wind Intermittency in Constrained Electrical Network The storage state at any time is determined by the accumulation of volume available in the past and the provided and discharged volume at the...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 7 pot
... load, the diesel engine is disconnected from the induction generator The Power Electronic Interface (PEI) connecting the load to the main bus is used to fit the frequency of the power supplying the ... where TG is the turbine mechanical torque, Where ρ is the air density (kg /m3), R is the turbine radius (m),ν is the wind velocity (m/s), and Ct(λ,β) is the turbine torque coefficient The power ... Ds are the inertia and frictional damping of SG, isd, isq are the direct and quadrature current component of SG, Ld, Lf are the stator d-axis and rotor inductance of SG, Lmd is the d-axis field...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 8 pot
... etc.) and wind farms (size and technology of the wind turbines, dispersion of wind turbines on the island, etc.) It is often the case that the limit set by the system operator for the instantaneous ... stations, the large size of the units in relation to the load, the need for larger spinning reserve due to the absence of interconnections, and the small stability margins raise the impact on safety and ... total gain of the system remains unchanged for all the operating points of the wind turbine 3.2 Simulation results In the following, the emphasis is made on the secure operation of the system under...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 9 potx
... following the frequency event This control, reestablishes in the DFIG wind turbines the intrinsic characteristic of the fixed speed ASIG wind turbines, thus, using the kinetic energy accumulated in the ... Thus, the inertia of the system, including the “virtual” inertia provided by the DFIG wind turbines, is obviously reduced when the proportion of the wind turbines providing auxiliary control is ... achieved in cases (c) and (d), thus when either Droop control is implemented on the wind turbine control level (case (c)) or when the Combined control is used (case (d)) In this scenario, the effect...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 10 pot
... will introduce high disturbance into the electric systems by increasing the risk of instability This risk can be avoided by increasing the spinning reserves; that is, by increasing the cost of the ... input rate in the storage phase, Eout is the rate in the energy recovery phase ˙ and Eloss is the rate of energy lost in the storage itself The increase in the stored energy is the following when ... : ˙ Ein = ηs [ P (t) − P ] P (t) > P + δ1 otherwise (10) where ηs is the efficiency of the driver in the storage phase, and δ1 ≤ Δ The decrease of energy in the recovery phase is the following...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 11 pptx
... Wind Farm – Impact in Power System and Alternatives to Improve the Integration This transformation is used in both the fitting and prediction processes The histograms of wind speed signals in ... example, if the prediction update interval is 10 minutes and the measurement delay is hour, then the sample count delay is L = 60/10 = samples The minimum estimation delay is L = In our work ... Actual and normalized wind speed data 2.2 Normalization of wind speed data The initial step in the prediction process is data normalization This step is done by transforming the actual wind speed...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 12 potx
... of the wind farm Thus, the wind speed model simulates the wind speed fluctuations that influence the fluctuations in the power of the wind turbines The wind acting on the rotor plane of a wind ... on the side of the rotor blade which is not facing the wind This stall prevents the lifting force of the rotor blade from acting on the rotor As the actual wind speed in the area increases, the ... of the wind turbine model is presented in Fig 2.1 The wind speed model The wind models describe the fluctuations in the wind speed, which influence the power quality and control characteristics...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 13 potx
... step is to investigate and enhance the controller’s capabilities to handle grid faults Another interesting issue is to explore the present controllers in the design of a whole wind farm and the ... contingency list for the two cases were obtained by applying the D criterion, involving single generating unit or single transmission elements The purpose of a contingency selection process is ... considered as the base system in the following planning studies described in this chapter Wind integrated MRTS reinforcement planning using the D, P and D-P methods As noted earlier, the MRTS with the...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 14 pptx
... turbine The cut -in speed is the minimum wind speed at which the turbine can start working, the nominal wind speed is the point at which rated power of the turbine is achieved This power is normally ... the injected power This reflects the process of the wind turbine converting the kinetic energy of the wind into electric energy by means of the generator The wind turbine is modelled as an agent, ... the transitions, exponentially distributed random numbers are used The distribution is parametrised by the rate In Figure the representation of the turbines and their current state is shown The...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 8 doc
... are interested in the issue Technology of wind turbines and their development A wind turbine is a machine that converts kinetic energy from the wind into electric energy In dependence on the ... the “pitch“ one It differs in the last regime when maintaining the constant output is not achieved by increasing the blade setting angle but decreasing this angle In such a regime it is the case ... of the overall wind farm output in the CR The construction of this wind farm resulted in a rather sharp increase in the installed capacity in 2007 (Cetkovský et al., 2010) In 2008 an increase in...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 9 doc
... of these is the first – identifying and characterizing the resource This chapter will discuss this first stage in detail, outlining the state of the art in understanding the wind resource, and ... 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 ... noise is prevented in the vertical direction), on the shape of the Wind Farms and Their Impact on the Environment 155 earth surface and on the existence of obstacles to the noise spread The noise...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 10 pdf
... provide the basis for the mean wind speed distribution across the nine sites in the model Site is the windiest 10 11 The procedure for generating Rayleigh-distributed, spatially correlated wind speeds ... providing the correct siting incentives to individual wind developers will require those incentives to be conditioned on the siting decisions by all other wind developers, and we finish this chapter ... with the primary insights of the simulation model arising from the qualitative comparison of the siting decisions made by individual wind developers versus the system operator 4.1 Individual wind...
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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 11 pdf
... play in mapping stratigraphy, determining the thickness of superficial deposits and the depth to engineering rockhead, establishing weathering profiles, and the study of particular erosional and ... part of the site investigation The laboratory testing usually begins once the subsurface exploration and tests is complete The first step in the laboratory testing is to log in all of the materials ... effective in horizontal stratified media, since the spatial distribution of the electrical current in the ground and, hence, the depth of investigation depends on the configuration of the array and the...
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