clock generation and distribution circuits

... level of the LV and MV grids, diffused renewable generation 20 Electrical Generation and Distribution Systems and Power Quality Disturbances units should be enabled by the standards and by appropriate ... sources on the power-supply stability and quality, both in grid connected Electrical Generation and Distribution Systems and Power Quality Disturbances and stand-alone configurations, in order to ... Electrical Generation and Distribution Systems and Power Quality Disturbances, Edited by Gregorio Romero Rey and Luisa Martinez Muneta p cm ISBN 978-953-307-329-3 Contents Preface IX Part Power Generation...

Ngày tải lên: 26/06/2014, 23:20

... sources on the power-supply stability and quality, both in grid connected Electrical Generation and Distribution Systems and Power Quality Disturbances and stand-alone configurations, in order to ... quality understanding, evaluation or monitoring are analyzed The book is divided into four sections: power generation and distribution systems, disturbances and voltage sag, software tools, and industrial ... Electrical Generation and Distribution Systems and Power Quality Disturbances, Edited by Gregorio Romero Rey and Luisa Martinez Muneta p cm ISBN 978-953-307-329-3 Contents Preface IX Part Power Generation...

Ngày tải lên: 12/08/2014, 05:20

... coefficient bs and bw are a scaling dilation coefficient and a 64 Electrical Generation and Distribution Systems and Power Quality Disturbances wavelet dilation coefficient cs and cw are scaling ... (8) Which u and y are input and output functions Q and P are a nonlinear subspace and a linear subspace L is a linear coefficient d is output offset as and aw are a scaling coefficient and a wavelet ... condition and a fault condition like islanding Three factors affecting the operation of inverters are input weather conditions, local loads and utility grid variations 56 Electrical Generation and Distribution...

Ngày tải lên: 12/08/2014, 05:20

... “Small-Signal Stability and Transient Analysis of an Autonomous PV System”, Transmission and Distribution Conference and Exposition, 2008 80 Electrical Generation and Distribution Systems and Power Quality ... Comparison of measured and modeled electrical parameters of the FVHC condition and the transient step down condition 76 Electrical Generation and Distribution Systems and Power Quality Disturbances ... between modeling and experimental outputs, (iii) FPE and AIC, both of these values need be lowest for high accuracy of modeling (iv) 70 Electrical Generation and Distribution Systems and Power Quality...

Ngày tải lên: 12/08/2014, 05:20

... Interface distribution of the operation times and repair times Fig 20 Interface for the reliability and nonreliability functions 109 110 Electrical Generation and Distribution Systems and Power ... Maintenance Actions in Transmission and Distribution Networks, In: Proceedings of the 3rd International 112 Electrical Generation and Distribution Systems and Power Quality Disturbances Conference ... disturbances and minor non-linearity in the control process Vector control uses PI-controllers in order to improve dynamic response and to reduce the 114 Electrical Generation and Distribution Systems and...

Ngày tải lên: 12/08/2014, 05:20

... instantaneous reactive and three phase reactive power flowing into grid Fig 16(a) shows instantaneous reactive power flowing into grid which 130 Electrical Generation and Distribution Systems and Power Quality ... hysteresis band From the above graphs we could say that % THD variation is less in modified ramp type current controller Switching frequency is 134 Electrical Generation and Distribution Systems and ... Electrical Generation and Distribution Systems and Power Quality Disturbances Milosevic Mirjana, Hysteresis current control in three phase voltage source inverter, ETH publications, power systems and...

Ngày tải lên: 12/08/2014, 05:20

... industrial and commercial power systems IEEE Std 1100, (1999) IEEE Recommended Practice for Powering and Grounding Electronic Equipment 160 Electrical Generation and Distribution Systems and Power ... characterising voltage 152 Electrical Generation and Distribution Systems and Power Quality Disturbances sags The voltage sags are caused by an increase in reactive demand due to induction motor starting ... 148 Electrical Generation and Distribution Systems and Power Quality Disturbances A sensitive setting will result in a large number of shallow events (with a low voltage sag energy) and this in...

Ngày tải lên: 12/08/2014, 05:20

... a unified power flow with series and shunt elements 216 Electrical Generation and Distribution Systems and Power Quality Disturbances In Fig 14 combined shunt and series controllers inject current ... (δ cR ) ) (11) Where VvR and VcR are the controllable magnitude, 218 Electrical Generation and Distribution Systems and Power Quality Disturbances max VvR ≤ VvR ≤ VvR , and phase angle, ≤ δ vR ... Electrical Generation and Distribution Systems and Power Quality Disturbances Fig 20 The package for FACTS modelling and analysis (SimFACTS) with three languages: Arabic, English and French In...

Ngày tải lên: 12/08/2014, 05:20

... development and control for a SRM drive with front-end boost SMR were presented in (Chai & Liaw, 2009) In (Chai et al, 2008), the novel random 252 Electrical Generation and Distribution Systems and Power ... imbalance caused by source voltage and switching operation, and it can provide fault tolerant operation 258 Electrical Generation and Distribution Systems and Power Quality Disturbances 3.2.3 ... devices without any extra current and voltage stress 260 Electrical Generation and Distribution Systems and Power Quality Disturbances Operation principle and some key issues of SMR 4.1 Single-phase...

Ngày tải lên: 12/08/2014, 05:20

... Proceedings of IEEE Applied Power Electronics Conference and Exposition, pp 293-298, ISBN 0-7803-0983-9 290 Electrical Generation and Distribution Systems and Power Quality Disturbances Tanitteerapan, T ... another IGBT pair to save part and cost With this circuit configuration it is convenient to control the current 300 10 Electrical Generation and Distribution Systems and Power Quality Disturbances ... will be used 304 14 Electrical Generation and Distribution Systems and Power Quality Disturbances Will-be-set-by-IN-TECH Conclusion In this chapter, a simple and integrated battery charger with...

Ngày tải lên: 12/08/2014, 05:20

... load currents during peak and emergency conditions, performing coordination studies that include source and low side protection equipment, and expected transformer size and winding configuration ... maintenance and cost advantages found with power fuses Protection and control devices, circuit breakers, and station batteries are required The overcurrent relays are a small part of the total cost and ... aging, contamination, cracking, internal moisture, and loss of oil can all cause a bushing to fail Two other possible reasons are vandalism and animals that externally flash over the bushing Transformer...

Ngày tải lên: 21/03/2014, 12:08

... above a small set-value SET_4 and the negative and zero sequence currents I2 and I2 not exceed a small set-value SET_3, then a fuse failure condition will pick up to one and remain in that state thanks ... in case of a loss of VT signal and contrary to a fault condition, there should not be any change in the current’s magnitudes and phases Therefore, the negative and zero sequence currents should ... recommended by the ANSI=IEEE guides and standards Fig 2.10 represents a typical dual definite-time characteristic whereas Fig 2.11 represents a combined definite and inverse-time characteristic One...

Ngày tải lên: 21/03/2014, 12:08

... those lines operating at 138 kV and above, subtransmission lines are 34.5 kV to 138 kV, and distribution lines are below 34.5 kV These are not rigid definitions and are only used to generically ... systems become more complex and the fault current varies with changes in generation and system configuration, directional overcurrent relays become difficult to apply and to set for all contingencies, ... multiphase fault between phases x and y, Ex À Ey ¼ Z1 Ix À Iy (3:1) where x and y can be a, b, or c and Z1 is the positive sequence impedance between the relay location and the fault For ground distance...

Ngày tải lên: 21/03/2014, 12:08

... operating conditions such as voltage profile and generation dispatch, coordinating relays and controls, and load shedding Most utilities rely on planning and operation studies to guard against voltage ... separates, islands with an imbalance between generation and load are formed One consequence of the imbalance is deviation of frequency from the nominal value If the generators cannot handle the imbalance, ... PMUs, and performs data checks, records disturbances, and rebroadcasts the combined data stream to other monitor and control applications This type of unit fulfills the need for both hard and soft...

Ngày tải lên: 21/03/2014, 12:08

... ANSI=IEEE Standard C37.90, provides the standard for the Surge Withstand Capability (SWC) to be built into protective relay equipment The standard consists of both an oscillatory and transient ... in time and Eq (5.44) represents the measurements The terms wk and vk are discrete time random processes representing state noise, i.e., random inputs in the evolution of the parameters, and measurement ... state x, and recursively updates the estimate of state The initial assumption about the state is that it is a random vector independent of the processes wk and vk and with a known mean and covariance...

Ngày tải lên: 21/03/2014, 12:08

... transformer (CT) saturation This phenomenon is prevalent in current circuits and can cause problems in differential and polarizing circuits The top waveform is an example of a direct current (DC) ... ‘‘off ’’ initially and cut ‘‘on’’ shortly after fault initiation It stayed ‘‘on’’ for a few cycles after the fault cleared and stayed ‘‘off ’’ all during the reclose ‘‘dead’’ time and after restoration ... reclosure, and delayed breaker failure response for permanent faults upon reclosure, and a ‘‘stuck’’ breaker In Fig 6.3 two waveforms are shown that depict adequate carrier response for internal and...

Ngày tải lên: 21/03/2014, 12:08

... rotor angle instability and voltage instability go hand in hand One may lead to the other, and the distinction may not be clear However, distinguishing between angle stability and voltage stability ... faults, loss of generation, or circuit contingencies This ability is determined by the system-load characteristics and the interactions of both continuous and discrete controls and protections ... upset resulting in a significant imbalance between generation and load It depends on the ability to restore balance between system generation and load, with minimum loss of load Severe system...

Ngày tải lên: 21/03/2014, 12:08

... or island, a power system into areas with ß 2006 by Taylor & Francis Group, LLC balanced generation and load Some load shedding or generation tripping may also be required in selected islands ... Load and generation forecast: The design process must use forecast information about the amount, distribution, and characteristics of the connected loads as well as the location and amount ... Defines system topology and initial operating state Dynamic data: Includes model types and associated parameters for generators, motors, protections, and other dynamic devices and their controls Program...

Ngày tải lên: 21/03/2014, 12:08

... participating in the swing; the synchronizing and damping terms are frequency dependent and are influenced by generator rotor circuits, excitation controls, and other system controls ß 2006 by Taylor ... capacitor and reactor banks, tapchanging transformers, and SVCs Modulation controls to enhance power system stability have been applied extensively to generator exciters and to HVDC, SVC, and TCSC ... predictable by simulation, its nonlinear character and vast size lead to challenging demands on system planners and operating engineers The experience and intuition of these engineers is generally...

Ngày tải lên: 21/03/2014, 12:08

... in Fig 10.7 In this model (Xu and Mansour, 1994), x is the state variable Pt(V ) and Ps(V ) are the transient and steady-state load characteristics, respectively, and can be expressed as Pt ¼ ... these Jacobians, and their sensitivities with respect to various system parameters Bus voltage profiles and their sensitivity to variations in active and reactive power of the load and generators, ... by generators, synchronous condensers, and static-var compensators and its sensitivity to variations in load bus active and= or reactive power These indices and sensitivities, as well as their associated...

Ngày tải lên: 21/03/2014, 12:08