in electrical power systems

Ngày tải lên: 12/12/2013, 08:18

... 8: POWER QUALITY BENCHMARKING Introduction Benchmarking Process RMS Voltage Variation Indices Harmonics Indices Power Quality Contracts Power Quality Insurance Power Quality State Estimation Including ... following terms are meaningless in terms of describing an event and determining a solution Blackout Glitch Blink Outage Brownout Interruption Bump Power surge Clean ground Raw power Clean power ... period between 30 cycles and s interruption, sustained (electrical power systems) Any interruption not classified as a momentary interruption interruption, sustained (power quality) A type of long-duration...

Ngày tải lên: 31/12/2013, 23:26

... available power system optimization packages contain powerful linear programming algorithms for solving power system problems for both planning and operating engineers Linear programming has extensions ... studied in this book This book is useful for B Sc senior students in the electrical engineering discipline, MS and PhD students in the same discipline all over the world, electrical engineers working ... immense interest in the engineering field in the last two decades Optimization methods are of great importance in practice, particularly in engineering design, scientific experiments, and business...

Ngày tải lên: 30/03/2014, 07:20

... 8: POWER QUALITY BENCHMARKING Introduction Benchmarking Process RMS Voltage Variation Indices Harmonics Indices Power Quality Contracts Power Quality Insurance Power Quality State Estimation Including ... following terms are meaningless in terms of describing an event and determining a solution Blackout Glitch Blink Outage Brownout Interruption Bump Power surge Clean ground Raw power Clean power ... Therefore, the standards in the power quality area are devoted to maintaining the supply voltage within certain limits AC power systems are designed to operate at a sinusoidal voltage of a given...

Ngày tải lên: 08/08/2014, 15:21

... two windings connected in parallel at the lower voltage rating, or in series at the higher voltage rating When operated with a part-winding starter at the lower voltage rating, only one winding ... power is rectified into dc power, which charges a bank of batteries This dc power is then inverted back into ac power, to feed the load If the incoming ac power fails, the inverter is fed from ... NEUTRALIZING WINDING Figure 3.14 LOAD SECONDARY WINDING Schematic of ferroresonant constant-voltage transformer Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)...

Ngày tải lên: 08/08/2014, 15:21

... secondary winding In any case, the resulting transient is a very short single impulse, or train of impulses, because the interwinding capacitance charges quickly Arresters on the secondary winding should ... Bollen, Understanding Power Quality Problems, Voltage Sags and Interruptions, IEEE Press Series on Power Engineering, The Institute of Electrical and Electronics Engineers, Inc., New York, 2000 ... settling into a stable operating point (intersection 3) after an initial transient Figure 4.13 When C is very large, the capacitive reactance line will intersect only at points and One operating...

Ngày tải lên: 08/08/2014, 15:21

... the Internet since all vendors of this type of software maintain websites Nearly all the tools for power systems solve the problem in the time domain, re-creating the waveform point by point ... vars In the sinusoidal case, the reactive power is simply defined as V1I1 Q ϭ S sin ␪1 ϭ ᎏ sin ␪1 ϭ V1rms I1rms sin ␪1 (5.7) which is the portion of power in quadrature with the active power ... reactive power when distortion is present has another interesting peculiarity In fact, it may not be appropriate to call it reactive power The concept of var flow in the power system is deeply ingrained...

Ngày tải lên: 08/08/2014, 15:21

... utility distribution systems or industrial power systems Installing large nonlinear devices or loads Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright ... mode of coupling is less significant The direct inductive coupling is equal in both conductors, resulting in zero net voltage in the loop formed by the conductors Inductive coupling can still ... magnetic fluxes These induced currents flow in the windings, in the core, and in other conducting bodies subjected to the magnetic field of the transformer and cause additional heating This component...

Ngày tải lên: 08/08/2014, 15:21

... the power supply system Shunt capacitors help maintain the voltage by reducing the current in the lines Also, by overcompensating inductive circuits, a voltage rise can be achieved To maintain ... Chapter Seven LINE IN TRIACS SENSING AND CONTROL LOAD AUTOTRANSFORMER Figure 7.4 Electronic tap-switching regulator 7.2.5 On-line UPS systems On-line UPS systems intended for protection against sags ... Part 5: Installation and mitigation guidelines These standards provide guidelines in application of equipment such as earthing and cabling of electrical and electronic systems for ensuring electromagnetic...

Ngày tải lên: 08/08/2014, 15:21

... variations in the amount of reactive power delivered to the system, thus increasing the reactive power during heavy loading periods and reducing the reactive power during light loading SVCs can ... Halpin, J W Smith, C A Litton, “Designing Industrial Systems with a Weak Utility Supply,” IEEE Industry Applications Magazine, March/April 2001, pp 63–70 Interharmonics in Power Systems, IEEE Interharmonic ... resulting in a low short-circuit ratio This, in combination with considerable variations in current over a short period of time, results in flicker As the load increases, the current in the line increases,...

Ngày tải lên: 08/08/2014, 15:21

... 9.4 Microturbine in a combined heat and power installation (Courtesy of Capstone Turbine Corporation.) Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) ... and shorting switch must be installed 9.3.2 Asynchronous (induction) machines In many ways, it is simple to interface induction machines to the utility system Induction generators are induction ... within the machine 9.3.3 Electronic power inverters All DG technologies that generate either dc or non power frequency ac must use an electronic power inverter to interface with the electrical power...

Ngày tải lên: 08/08/2014, 15:21

... Source: Electrical Power Systems Quality Chapter 11 Power Quality Monitoring Power quality monitoring is the process of gathering, analyzing, and interpreting raw measurement data into useful information ... website Power Quality Monitoring Power Quality Monitoring 465 monitoring that could include recording of power quality information Virtually all the revenue meter manufacturers are moving in this ... associated with wiring and grounding practices are covered in Federal Information Processing Standard (FIPS) 94, Guideline on Electrical Power for ADP Installations (1983) This is the original source...

Ngày tải lên: 08/08/2014, 15:21

... that in off-line assessment analysis 11.5 Application of Intelligent Systems Many advanced power quality monitoring systems are equipped with either off-line or on-line intelligent systems to evaluate ... applications of intelligent systems or autonomous expert systems in monitoring instruments help engineers determine the system condition rapidly Downloaded from Digital Engineering Library @ McGraw-Hill ... of intelligent systems within a monitoring instrument can significantly increase the value of a monitoring application since it can generate information rather than just collect data.11 The intelligent...

Ngày tải lên: 08/08/2014, 15:21

... 0.214 (d) 0.613 18 Electrical Power Systems Resistance and Inductance of Transmission Lines 2.1 INTRODUCTION Power system engineering is that branch of Electrical Engineering which concerns itself ... in Fig 2.14 Find the mutual inductance between the two circuits and the voltage induced per km in the telephone line if the current in the power line is 120 amp 36 Electrical Power Systems Solution: ... .(2.19) Integrating from o to r, we get the total internal flux linkages as z r lint = o moI 2p r x dx = moI Wb–T/m 8p .(2.20) 22 Electrical Power Systems or lint = or p ´ 10 -7 × I Wb–T/m 8p l int...

Ngày tải lên: 19/08/2014, 14:29

... practical power systems which are an industrial park power system and a goldcopper mining power system both located in Indonesia These case studies of real power systems have been performed using actual ... the Research In the power system industry, power engineers have been using some programming, tools and heuristic approach to find the optimal configuration in operating the power systems and this ... and Maintenance", IEEE Singapore Power Chapter Invited Speaker, December 2009, NUS viii INTRODUCTION In power system operation and planning, optimum power flow is one of the areas in which power...

Ngày tải lên: 16/10/2015, 15:39

... India 605005; www.integra-india.com Printed and bound in Great Britain by MPG Books Ltd, Bodmin, Cornwall Preface Electrical power systems - an overview Power systems engineering - fundamental ... within power engineering, with a special focus on areas undergoing rapid development The series complements the long-established range of Newnes titles in power engineering, which includes the Electrical ... receiving end.8 A similar distinction arises with reactive power The receiving end in Figure 2.5 evidently has a lagging power factor and is absorbing VArs The sending end has a leading power...

Ngày tải lên: 16/02/2014, 20:20

... Consulting, Inc., an engineering consulting firm specializing in power electronics, magnetic design, and analog circuits and systems He is also an adjunct professor of electrical engineering at ... Preface This book is intended for use by practicing power engineers and managers interested in the emerging field of power quality in electrical systems We take a real-world point of view throughout ... core and copper windings.6 This can result in core heating, winding heating, torque pulsations, and loss of efficiency in these motors Harmonics can also result in an increase in audible noise...

Ngày tải lên: 21/08/2014, 12:37

... Chapter Introduction to Transients Electrical power systems are highly nonlinear and dynamic in nature: circuit breakers are closing and opening, faults are being cleared, generation is varying in ... is nonlinear Electrical power systems are perhaps the most nonlinear systems in the physical world For nonlinear systems, general methods of 2-6 Static and Dynamic Systems Consider a time-invariant, ... member of the IEEE Industry Applications and IEEE Power Engineering societies, a Fellow of Institution of Engineering Technology (UK), a Life Fellow of the Institution of Engineers (India), a member...

Ngày tải lên: 02/01/2014, 10:44

... In: Power engineering society summer meeting, 25–25 July 2002, vol IEEE, pp 1360–1365 42 Shahidehpour M, Yamin H, Li Z (2002) Market operation in electric power systems, forecasting, scheduling ... “Handbook of Power Systems I & II,” published by Springer in 2010 For decades, power systems have been playing an important role in humanity Industrialization has made energy consumption an inevitable ... decisions to the gas industry including determining optimal market dispatch and nodal prices Network Interactions are common in power systems This section of the book addresses the interaction between...

Ngày tải lên: 18/02/2014, 22:20