ECE 422/522 Power System Operations & Planning/ Power Systems Analysis II 3 Load Modeling
|
|
- Jesse Sherman
- 5 years ago
- Views:
Transcription
1 ECE 422/522 Power System Operations & Planning/ Power Systems Analysis II 3 Load Modeling Spring 2014 Instructor: Kai Sun 1
2 References 1. Load Performance for Dynamic Performance Analysis, IEEE Committee Report, IEEE Trans. on Power Systems, Vol. 8, No. 2, pp , May Bibliography on Load Models for Power Flow and Dynamic Performance Simulation, Vol. 10, No. 1, pp , Feb Standard Load Models for Power Flow and Dynamic Performance Simulation, IEEE Trans. on Power Systems, Vol. 10, No. 2, pp , Aug P. Pourbeik and B. Agrawal, A hybrid model for representing air-conditioner compressor motor behavior in power system studies, in Proc. IEEE PES General Meeting, Jul EPRI Report: Load Modeling for Power Flow and Transient Stability Computer Studies, Vol. 2: Load-Modeling Reference Manual, Product ID: EL-5003-CCMV2, EPRI Report: Measurement-Based Load Modeling, Product ID: ,
3 Background The representation of loads has not received as much attention as other components in power systems, but it may have significant impacts on stability analysis results. Without motor load dynamics modeled With motor load dynamics modeled (Source: B. Sapkota, et al, Dynamic VAr Planning in a Large power System Using Trajectory Sensitivities, IEEE Trans. Power Systems, v25, n1, Feb, 2010) 3
4 (Source : Measurement-Based Load Modeling, EPRI Report, Product ID: , 2006) 4
5 Background (cont d) Accurate load modeling is difficult because: At high-voltage levels, loads must be aggregated for stability studies A power system has a large number of diverse load components Ownerships and locations of load devices are not directly accessible to the electricity utility There is no precise information on load composition, which changes with time of day and week, seasons and weather. Load characteristics are uncertain, particularly for large voltage or frequency variations 5
6 Basic Concepts 6
7 Bus Load A portion of the actual system, which is not explicitly represented in the system model, but treated as a single power-consuming device connected to a bus in the system model Therefore in this context, load includes connected load devices together with some or all of the following: Substation step-down transformers Sub-transmission feeders Primary distribution feeders Distributions transformers Secondary distribution feeders Shunt capacitors Voltage regulators Customer wiring, transformers and capacitors If we want to represent the load accurately, the elements listed above must be accounted for. To a large extent, this depends on what is and is not represented in the system model. For bulk power system studies, much of the sub-transmission as well as the distribution system are omitted. 7
8 Load Characteristics: A set of parameters or functions, e.g. power factor, P(V,f) and Q(V,f), describing behaviors of a specified load. This could be applied to either a specific load device or an aggregation of multiple load devices (e.g. a load component, a load class and the total bus load) Load Component: The aggregate equivalent of all load devices of similar types, e.g. heater, air conditioner, lighting, etc. Load Composition: Fractional composition of the load by Load Components Could be fraction applied to a Bus Load or to a specific Load Class As an example, composition for an internet data center could be 40~50% computer servers, 40~50% HVAC loads and 10~15% lighting loads Load Class: A category of load, e.g. residential, commercial or industrial. For load modeling purposes, it is useful to group loads into several classes, which each have similar load composition and characteristics Load class mix: Fractional composition of the Bus Load by Load Class. 8
9 Load Bus Load Class Mix, e.g. 80% residential + 20% commercial Load Class, e.g. Residential Commercial Industrial Load Composition e.g. 20% lighting + 40% heating + 40% AC Load Component, e.g. Heater load Air Conditioner load Lighting load Load Characteristics e.g. Power factor P(V,f), Q(V,f) Motor Load Device, e.g. Heater Air Conditioner Light 9
10 Load Model Load Model represents the relationship between P&Q of the load, bus voltage magnitude and frequency Static Load Models: P & Q at t expressed as P(V(t), f(t)) and Q(V(t), f(t)), i.e. algebraic functions of bus voltage magnitude V and frequency f. Used to represent static loads like resistive and lighting loads, and as an approximation to dynamic loads. Dynamic Load Models: P & Q at t expressed as functions of V and f at past instants in time and at t. Usually represented by difference or differential equations. 10
11 Static Load Models Polynomial load model (ZIP Model): P 0, Q 0 and V 0 are rated values or the values at the initial operating condition V = V V 0 P = P 0 p 1 V 2 + p 2 V + p 3 Q = Q 0 (q 1 V 2 + q 2 V + q 3 ) It is composed of constant impedance (Z), constant current (I) and constant power (P/Q) components. Exponential load model P = P 0 V a Q = Q 0 V b With a (or b) = 0, 1 or 2, the model represents constant power, constant current and constant impedance, respectively. Around V 0, P V a Q V b Usually, a=0.5~1.8 and b=1.5~6 11
12 Frequency Dependency With a frequency deviation f = f f 0 P = P 0 V a 1 + K pp f Q = Q 0 V b (1 + K qf f) Typically, K pf = P/ f= 0~3.0, K qf = Q/ f= -2.0~0 P = P 0 (p 1 V 2 + p 2 V + p 3 ) (1 + K pp f) Q = Q 0 (q 1 V 2 + q 2 V + q 3 ) (1 + K qq f) Frequency of the bus voltage is not a state variable in the system model for stability analysis. It can be computed by taking the numerical derivative of the voltage phase angle. Comprehensive static model: P = P 0 (P ZZZ + P EEE + P EE2 ) 12
13 Static Load Models a b K pf K qf a b K pf K qf P = P 0 V a 1 + K pp f Q = Q 0 V b (1 + K qq f) 13
14 a b P = P 0 V a 1 + K pp f Q = Q 0 V b (1 + K qq f) 14 14
15 Common Practice in Stability Studies In the absence of information on load characteristics: When V is around V 0 a=1: P as constant current b=2: Q as constant impedance When V is below a threshold (e.g. 0.6~0.7V 0 ), convert the load to constant impedance to avoid computational problems See the snapshots on TSAT 15
16 Induction Motors Motor loads consume 60-70% of the total energy supplied by a power system Many industrial motors have starters with electromagnetically held contactors For 2.3-4kV motors, contactors drop at 65-75% of rated voltage For 460V or lower motors, contactors drop at 55-65% of rated voltage Motors could drop 70% of system load during a fault or during voltage excursions following the fault For sending-end generators, this will impact stability since lost loads will increase acceleration. For receiving-end generators, this will improve stability See Kundur s section 7.2 for modeling of induction motors 16
17 Air-Conditioner Compressor Motors Up to 50% of system load in summer Referred to as a prone to stall motor with low inertia. Similar to a standard induction motor under normal operating conditions It stalls if the voltage is low (e.g. 50~65% of the nominal voltage for 3 cycles) due to a fault Once stalled, it behaves like a constant impedance load (with a low power factor) drawing 2-3 times of the rated current. The thermal overload protection disconnects the motor if it remains stalled for considerable amount of time (typically, 15s if stalled at 50% voltage) It recovers if voltage goes back to 70% of the nominal voltage. That delays the voltage recovery. In areas with a high percentage of air conditioner loads, delayed voltage recovery, short-term voltage stability and fast voltage collapse are main stability concerns. 17
18 Southern California Edison has experienced delayed voltage recovery problems due to its high percentage of air conditioner loads. The high load currents and VAR demands caused up to 30s delays for the voltage to recover following the fault clearing operation 18
19 Discharge Lighting Loads Mercury vapor, sodium vapor, etc. About 20% of the load in commercial areas Extinguishes at voltages of 70~80% of rated voltage This causes load to drop following fault clearing. That will improve or impact stability depending on the location When the voltage recovers, they restart after 1-2 sec delay 19
20 Thermostat-Controlled Loads Space heaters, water heaters, molding and packaging machines, soldering machines, etc. Short term: constant resistance. Long term: constant power with a suitable time constant 20
21 Approaches for Load Modeling Load aggregation can be performed in two ways Bottom-up (theoretical aggregation): Analytically, by lumping similar loads based on the load type and then using pre-determined values for each parameter of the load Referred to as component-based approach Top-down (identification): Selecting a load model structure and then performing parameter estimation using an appropriate identification technique based on field measurements Referred to as measurement-based approach 21
22 Component-based Approach for Load Modeling The load supplied at a bulk power delivery point is categorized into load classes and further into load components Study the characteristics of individual appliances in detail and aggregate individual loads to produce a composite load mode. 22
23 Measurement-based Approach for Load Modeling Load characteristics are measured at representative substations and feeders at selected times of the day and season. Steady-state P/ V, P/ f, Q/ V and Q/ f Dynamic load-voltage characteristics These are used to extrapolate the parameters of loads throughout the system 23
24 Data Collection 24
25 Measurement-based Load Modeling by EPRI [6] 25
26 Model Parameters for Identification Slip s= ω s ω r ω s 26
27 Field Test 27
28 Results 28
Trajectory Sensitivity Analysis as a Means of Performing Dynamic Load Sensitivity Studies in Power System Planning
21, rue d Artois, F-75008 PARIS CIGRE US National Committee http : //www.cigre.org 2014 Grid of the Future Symposium Trajectory Sensitivity Analysis as a Means of Performing Dynamic Load Sensitivity Studies
More informationChapter 8 VOLTAGE STABILITY
Chapter 8 VOTAGE STABIITY The small signal and transient angle stability was discussed in Chapter 6 and 7. Another stability issue which is important, other than angle stability, is voltage stability.
More informationDynamic Voltage Stability Enhancement of a Microgrid with Static and Dynamic Loads Using Microgrid Voltage Stabilizer
Dynamic Voltage Stability Enhancement of a Microgrid with Static and Dynamic Loads Using Microgrid Voltage Stabilizer Kenan Hatipoglu 1, Ismail Fidan 2, Ghadir Radman 3 1 Electrical and Computer Engineering
More informationECE 422/522 Power System Operations & Planning/Power Systems Analysis II : 8 - Voltage Stability
ECE 422/522 Power System Operations & Planning/Power Systems Analysis II : 8 - Voltage Stability Spring 2014 Instructor: Kai Sun 1 Voltage Stability Voltage stability is concerned with the ability of a
More informationFault Calculation Methods
ELEC9713 Industrial and Commercial Power Systems Fault Calculation Methods There are two major problems that can occur in electrical systems: these are open circuits and short circuits. Of the two, the
More informationECE 522 Power Systems Analysis II 3.3 Voltage Stability
ECE 522 Power Systems Analysis II 3.3 Voltage Stability Spring 2018 Instructor: Kai Sun 1 Content Basic concepts Voltage collapse, Saddle node bifurcation, P V curve and V Q curve Voltage Stability Analysis
More informationKINGS COLLEGE OF ENGINEERING Punalkulam
KINGS COLLEGE OF ENGINEERING Punalkulam 613 303 DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING POWER SYSTEM ANALYSIS QUESTION BANK UNIT I THE POWER SYSTEM AN OVERVIEW AND MODELLING PART A (TWO MARK
More informationPower System Analysis Prof. A. K. Sinha Department of Electrical Engineering Indian Institute of Technology, Kharagpur
Power System Analysis Prof. A. K. Sinha Department of Electrical Engineering Indian Institute of Technology, Kharagpur Lecture - 9 Transmission Line Steady State Operation Welcome to lesson 9, in Power
More informationLOAD MODELING STUDY USING MEASUREMENT DATA FOR TAIWAN POWER SYSTEM
Journal of Marine Science and Technology, Vol. 22, No. 5, pp. 643-649 (214) 643 DOI: 1.6119/JMST-14-11-1 LOAD MODELING STUDY USING MEASUREMENT DATA FOR TAIWAN POWER SYSTEM Chung-Liang Chang and Pei-Hwa
More informationHarmonic Modeling of Networks
Harmonic Modeling of Networks Thomas H. Ortmeyer ECE Dept. Clarkson University Potsdam, NY 13699-5720 M. Fayyaz Akram Dept. of Elec. Eng. Univ. of Engineering and Technology Lahore, Pakistan Takashi Hiyama
More informationSHORT QUESTIONS AND ANSWERS. Year/ Semester/ Class : III/ V/ EEE Academic Year: Subject Code/ Name: EE6501/ Power System Analysis
Srividya colllege of Engg & Tech,Virudhunagar Sri Vidya College of Engineering And Technology Virudhunagar 626 005 Department of Electrical and Electronics Engineering QUESTION BANK SHORT QUESTIONS AND
More informationEE 6501 POWER SYSTEMS UNIT I INTRODUCTION
EE 6501 POWER SYSTEMS UNIT I INTRODUCTION PART A (2 MARKS) 1. What is single line diagram? A Single line diagram is diagrammatic representation of power system in which the components are represented by
More informationB.E. / B.Tech. Degree Examination, April / May 2010 Sixth Semester. Electrical and Electronics Engineering. EE 1352 Power System Analysis
B.E. / B.Tech. Degree Examination, April / May 2010 Sixth Semester Electrical and Electronics Engineering EE 1352 Power System Analysis (Regulation 2008) Time: Three hours Answer all questions Part A (10
More informationECE 585 Power System Stability
Homework 1, Due on January 29 ECE 585 Power System Stability Consider the power system below. The network frequency is 60 Hz. At the pre-fault steady state (a) the power generated by the machine is 400
More informationTransient Stability Assessment of Synchronous Generator in Power System with High-Penetration Photovoltaics (Part 2)
Journal of Mechanics Engineering and Automation 5 (2015) 401-406 doi: 10.17265/2159-5275/2015.07.003 D DAVID PUBLISHING Transient Stability Assessment of Synchronous Generator in Power System with High-Penetration
More informationReliability of Bulk Power Systems (cont d)
Reliability of Bulk Power Systems (cont d) Important requirements of a reliable electric power service Voltage and frequency must be held within close tolerances Synchronous generators must be kept running
More informationEE 742 Chapter 3: Power System in the Steady State. Y. Baghzouz
EE 742 Chapter 3: Power System in the Steady State Y. Baghzouz Transmission Line Model Distributed Parameter Model: Terminal Voltage/Current Relations: Characteristic impedance: Propagation constant: π
More informationPower System Stability and Control. Dr. B. Kalyan Kumar, Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, India
Power System Stability and Control Dr. B. Kalyan Kumar, Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, India Contents Chapter 1 Introduction to Power System Stability
More informationUtilization of Genetic Algorithms and Constrained Multivariable Function Minimization to Estimate Load Model Parameters from Disturbance Data
Utilization of Genetic Algorithms and Constrained Multivariable Function Minimization to Estimate Load Model Parameters from Disturbance Data Christopher G. Mertz Thesis submitted to the faculty of the
More informationHybrid Time Domain Simulation: Application to Fault Induced Delayed Voltage Recovery (FIDVR)
Hybrid Time Domain Simulation: Application to Fault Induced Delayed Voltage Recovery (FIDVR) Vijay Vittal Arizona State University PSERC Webinar Jan. 2, 25 Presentation background The work presented in
More informationRESULTS OF ON-GRID OPERATION OF SUPERCONDUCTOR DYNAMIC SYNCHRONOUS CONDENSER
1 RESULTS OF ON-GRID OPERATION OF SUPERCONDUCTOR DYNAMIC SYNCHRONOUS CONDENSER Dr. Swarn S. Kalsi, David Madura, and Michael Ross American Superconductor Corporation (USA) Abstract: A high-temperature
More informationECE 422/522 Power System Operations & Planning/Power Systems Analysis II : 7 - Transient Stability
ECE 4/5 Power System Operations & Planning/Power Systems Analysis II : 7 - Transient Stability Spring 014 Instructor: Kai Sun 1 Transient Stability The ability of the power system to maintain synchronism
More informationEE2351 POWER SYSTEM ANALYSIS UNIT I: INTRODUCTION
EE2351 POWER SYSTEM ANALYSIS UNIT I: INTRODUCTION PART: A 1. Define per unit value of an electrical quantity. Write equation for base impedance with respect to 3-phase system. 2. What is bus admittance
More informationLong-term voltage stability : load aspects
ELEC0047 - Power system dynamics, control and stability Thierry Van Cutsem t.vancutsem@ulg.ac.be www.montefiore.ulg.ac.be/~vct December 2018 1 / 15 Table of contents Voltage instability results from the
More informationLecture 11 - AC Power
- AC Power 11/17/2015 Reading: Chapter 11 1 Outline Instantaneous power Complex power Average (real) power Reactive power Apparent power Maximum power transfer Power factor correction 2 Power in AC Circuits
More informationThe Necessity for Considering Distribution Systems in Voltage Stability Studies
The Necessity for Considering Distribution Systems in Voltage Stability Studies Farid Karbalaei 1, Ataollah Abedinzadeh 2 and Mehran Kavyani 3 1,2,3 Faculty of Electrical & Computer Engineering, Shahid
More informationElevated Neutral to Earth Voltages Due to Harmonics A T&D Update
Elevated Neutral to Earth Voltages Due to Harmonics A T&D Update E. R. (Randy) Collins, PhD, PE Dept. of Electrical and Computer Engineering Clemson University Clemson, South Carolina Stray Voltage Panel
More informationLow Frequency Transients
Page 1 IEEE Power Engineering Society Summer Meeting Edmonton, July 18-22, 1999 Tutorial: Power System Overvoltages Low Frequency Transients Presented by Bruce Mork Work Done by Slow Transients Task Force
More informationEE2351 POWER SYSTEM OPERATION AND CONTROL UNIT I THE POWER SYSTEM AN OVERVIEW AND MODELLING PART A
EE2351 POWER SYSTEM OPERATION AND CONTROL UNIT I THE POWER SYSTEM AN OVERVIEW AND MODELLING PART A 1. What are the advantages of an inter connected system? The advantages of an inter-connected system are
More informationHOW TO DEAL WITH ELECTROMAGNETIC DISTURBANCES CAUSED BY NEW INVERTER TECHNOLOGIES CONNECTED TO PUBLIC NETWORK
HOW TO DEAL WITH ELECTROMAGNETIC DISTURBANCES CAUSED BY NEW INVERTER TECHNOLOGIES CONNECTED TO PUBLIC NETWORK Xavier YANG EDF R&D - France xavier.yang@edf.fr Ludovic BERTIN EDF R&D - France ludovic-g.bertin@edf.fr
More informationLO 1: Three Phase Circuits
Course: EEL 2043 Principles of Electric Machines Class Instructor: Dr. Haris M. Khalid Email: hkhalid@hct.ac.ae Webpage: www.harismkhalid.com LO 1: Three Phase Circuits Three Phase AC System Three phase
More informationEXEMPLAR NATIONAL CERTIFICATE (VOCATIONAL) ELECTRICAL PRINCIPLES AND PRACTICE NQF LEVEL 3 ( ) (X-Paper) 09:00 12:00
NATIONAL CERTIFICATE (VOCATIONAL) ELECTRICAL PRINCIPLES AND PRACTICE NQF LEVEL 3 2008 (12041002) (X-Paper) 09:00 12:00 EXEMPLAR This question paper consists of 7 pages. EXEMPLAR -2- NC(V) TIME: 3 HOURS
More informationReview of Basic Electrical and Magnetic Circuit Concepts EE
Review of Basic Electrical and Magnetic Circuit Concepts EE 442-642 Sinusoidal Linear Circuits: Instantaneous voltage, current and power, rms values Average (real) power, reactive power, apparent power,
More informationFault Analysis Power System Representation
.1. Power System Representation Single Line Diagram: Almost all modern power systems are three phase systems with the phases of equal magnitude and equal phase difference (i.e., 10 o ). These three phase
More informationPOWER SYSTEM STABILITY
LESSON SUMMARY-1:- POWER SYSTEM STABILITY 1. Introduction 2. Classification of Power System Stability 3. Dynamic Equation of Synchronous Machine Power system stability involves the study of the dynamics
More information11.1 Power System Stability Overview
11.1 Power System Stability Overview This introductory section provides a general description of the power system stability phenomena including fundamental concepts, classification, and definition of associated
More informationChapter 9: Transient Stability
Chapter 9: Transient Stability 9.1 Introduction The first electric power system was a dc system built by Edison in 1882. The subsequent power systems that were constructed in the late 19 th century were
More informationUniversity of Moratuwa, Sri Lanka. EE3231: Design of Electrical Installation
University of Moratuwa, Sri Lanka B.Sc. Engineering Level 4 Semester 1 Examination EE3231: Design of Electrical Installation Time allowed: 2 Hours January 2010 Additional Material: Not required INSTRUCTIONS
More informationChapter 3 AUTOMATIC VOLTAGE CONTROL
Chapter 3 AUTOMATIC VOLTAGE CONTROL . INTRODUCTION TO EXCITATION SYSTEM The basic function of an excitation system is to provide direct current to the field winding of the synchronous generator. The excitation
More informationThe Mathematical Model of Power System with Static Var Compensator in Long Transmission Line
American Journal of Applied Sciences 9 (6): 846-850, 01 ISSN 1546-939 01 Science Publications The Mathematical Model of Power System with Static Var Compensator in Long Transmission Line Prechanon Kumkratug
More informationReal Time Synchrophasor Measurements Based Voltage Stability Monitoring and Control
Real Time Synchrophasor Measurements Based Voltage Stability Monitoring and Control Final Project Report S-65 Power Systems Engineering Research Center Empowering Minds to Engineer the Future Electric
More informationDynamic optimization based reactive power planning for improving short-term voltage performance
Graduate Theses and Dissertations Graduate College 2015 Dynamic optimization based reactive power planning for improving short-term voltage performance Magesh Kumar Paramasivam Iowa State University Follow
More informationTRANSIENT STABILITY ANALYSIS ON AHTS VESSEL ELECTRICAL SYSTEM USING DYNAMIC POSITIONING SYSTEM
International Journal of Mechanical Engineering and Technology (IJMET) Volume 10, Issue 02, February 2019, pp. 461-475, Article ID: IJMET_10_02_048 Available online at http://www.iaeme.com/ijmet/issues.asp?jtype=ijmet&vtype=10&itype=2
More informationJ. Electrical Systems x-x (2010): x-xx. Regular paper
JBV Subrahmanyam Radhakrishna.C J. Electrical Systems x-x (2010): x-xx Regular paper A novel approach for Optimal Capacitor location and sizing in Unbalanced Radial Distribution Network for loss minimization
More informationThe Mathematical Model of Power System with Thyristor Controlled Series Capacitor in Long Transmission Line
American Journal of Applied Sciences 9 (5): 654-658, 01 ISSN 1546-939 01 Science Publications The Mathematical Model of Power System with Thyristor Controlled Series Capacitor in Long Transmission Line
More informationENERGY AND TIME CONSTANTS IN RC CIRCUITS By: Iwana Loveu Student No Lab Section: 0003 Date: February 8, 2004
ENERGY AND TIME CONSTANTS IN RC CIRCUITS By: Iwana Loveu Student No. 416 614 5543 Lab Section: 0003 Date: February 8, 2004 Abstract: Two charged conductors consisting of equal and opposite charges forms
More informationTransient Behavior of
Transient Behavior of Static Fault Current Limiter in Distribution System by Shahram Najafi, Vijay K. Sood University of Ontario Institute of Technology, Oshawa, Ontario Electrical Power and Energy Conference
More informationKeywords: Superconducting Fault Current Limiter (SFCL), Resistive Type SFCL, MATLAB/SIMULINK. Introductions A rapid growth in the power generation
IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY Performance of a 3.3kV Resistive type Superconducting Fault Current Limiter S.Vasudevamurthy 1, Ashwini.V 2 1 Department of Electrical
More informationDirect Flux Vector Control Of Induction Motor Drives With Maximum Efficiency Per Torque
Direct Flux Vector Control Of Induction Motor Drives With Maximum Efficiency Per Torque S. Rajesh Babu 1, S. Sridhar 2 1 PG Scholar, Dept. Of Electrical & Electronics Engineering, JNTUACEA, Anantapuramu,
More informationEC T32 - ELECTRICAL ENGINEERING
EC T32 - ELECTRICAL ENGINEERING UNIT-I - TRANSFORMER 1. What is a transformer? 2. Briefly explain the principle of operation of transformers. 3. What are the parts of a transformer? 4. What are the types
More informationElectromagnetic Oscillations and Alternating Current. 1. Electromagnetic oscillations and LC circuit 2. Alternating Current 3.
Electromagnetic Oscillations and Alternating Current 1. Electromagnetic oscillations and LC circuit 2. Alternating Current 3. RLC circuit in AC 1 RL and RC circuits RL RC Charging Discharging I = emf R
More informationINSTITUTE OF AERONAUTICAL ENGINEERING (Autonomous)
INSTITUTE OF AERONAUTICAL ENGINEERING (Autonomous) Dundigal, Hyderabad - 500 043 ELECTRICAL AND ELECTRONICS ENGINEERING QUESTION BANK Course Name : Computer Methods in Power Systems Course Code : A60222
More informationF F FAULT CURRENT Prospective. 1. Introduction. 2. Types of fault conditions
FAULT CURRENT F F13-13 FAULT CURRENT - Contents 1. Introduction 2. Types of fault conditions 3 fault current must be determined 3.1 Purposes for which of prospective fault current magnitudes are used 3.2
More informationBrief Steady of Power Factor Improvement
International Journal of Electrical Engineering. ISSN 0974-2158 Volume 6, Number 5 (2013), pp. 531-539 International Research PublicationHouse http://www.irphouse.com Brief Steady of Power Factor Improvement
More informationECE 325 Electric Energy System Components 7- Synchronous Machines. Instructor: Kai Sun Fall 2015
ECE 325 Electric Energy System Components 7- Synchronous Machines Instructor: Kai Sun Fall 2015 1 Content (Materials are from Chapters 16-17) Synchronous Generators Synchronous Motors 2 Synchronous Generators
More informationINSTITUTE OF AERONAUTICAL ENGINEERING (Autonomous) Dundigal, Hyderabad
INSTITUTE OF AERONAUTICAL ENGINEERING (Autonomous) Dundigal, Hyderabad - 00 0 Department of Electrical and Electronics Engineering TUTORIAL QUESTION BANK Course Name : HIGH VOLTAGE ENGINEERING Course Code
More informationTOPFET high side switch
DESCRIPTION QUICK REFERENCE DATA Monolithic temperature and SYMBOL PARAMETER MIN. UNIT overload protected power switch based on MOSFET technology in a I L Nominal load current (ISO) 9 A pin plastic envelope,
More informationPhase Boundary Computation for Fault Induced Delayed Voltage Recovery
IEEE th Annual Conference on Decision and Control (CDC) December -,. Osaka, Japan Phase Boundary Computation for Fault Induced Delayed Voltage Recovery Michael W. Fisher Ian A. Hiskens Abstract Distribution
More informationECE 325 Electric Energy System Components 5 Transmission Lines. Instructor: Kai Sun Fall 2015
ECE 325 Electric Energy System Components 5 Transmission Lines Instructor: Kai Sun Fall 2015 1 Content (Materials are from Chapter 25) Overview of power lines Equivalent circuit of a line Voltage regulation
More informationPerformance Improvement of the Radial Distribution System by using Switched Capacitor Banks
Int. J. on Recent Trends in Engineering and Technology, Vol. 10, No. 2, Jan 2014 Performance Improvement of the Radial Distribution System by using Switched Capacitor Banks M. Arjun Yadav 1, D. Srikanth
More informationSCHOOL OF ELECTRICAL, MECHANICAL AND MECHATRONIC SYSTEMS. Transient Stability LECTURE NOTES SPRING SEMESTER, 2008
SCHOOL OF ELECTRICAL, MECHANICAL AND MECHATRONIC SYSTEMS LECTURE NOTES Transient Stability SPRING SEMESTER, 008 October 7, 008 Transient Stability Transient stability refers to the ability of a synchronous
More informationEE 451 Power System Stability
EE 451 Power System Stability Power system operates in synchronous mode Power system is subjected to a wide range of disturbances (small and large) - Loads and generation changes - Network changes - Faults
More informationIGEE 402 Power System Analysis. FINAL EXAMINATION - SAMPLE Fall 2004
IGEE 402 Power System Analysis FINAL EXAMINATION - SAMPLE Fall 2004 Special instructions: - Duration: 80 minutes. - Material allowed: a crib sheet (double sided 8.5 x ), calculator. - Attempt 5 out of
More informationElectromotive Force. The electromotive force (emf), ε, of a battery is the maximum possible voltage that the battery can provide between its terminals
Direct Current When the current in a circuit has a constant magnitude and direction, the current is called direct current Because the potential difference between the terminals of a battery is constant,
More informationModeling of Transmission Line and Substation for Insulation Coordination Studies
TRAINING DUBROVNIK, CROATIA - APRIL, 27-29 2009 SIMULATION & ANALYSIS OF POWER SYSTEM TRANSIENTS WITH EMTP-RV Modeling of Transmission Line and Substation for Insulation Coordination Studies Prof. Ivo
More informationDEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING QUESTION BANK
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING QUESTION BANK SUBJECT CODE & NAME: EE 2303 - TRANSMISSION & DISTRIBUTION YEAR / SEM: III/V UNIT-I TRANSMISSION SYSTEM INTRODUCTION PART-A 1. What is
More informationCapacitor Application Issues
Capacitor Application Issues Thomas Blooming, P.E. Daniel J. Carnovale, P.E. IEEE Industry Applications Society 53 rd Pulp & Paper Industry Technical Conf. Williamsburg, Virginia June 24-29, 2007 Introduction
More informationSurface Mount ESD Capability Rectifiers
Surface Mount ESD Capability Rectifiers Top View esmp TM Series MicroSMP Bottom View PRIMARY CHARACTERISTICS I F(AV).0 A V RRM 00 V, 200 V, 400 V, 600 V I FSM 20 A V F at I F =.0 A 0.925 V I R µa T J max.
More informationBasic Distribution Software Tasks
The Wind Interconnection Workshop Golden, CO May 22, 2013 Tom McDermott, tom@meltran.com MelTran, Inc. Basic Distribution Software Tasks Current Flow and Voltage Drop Conductor Overload? Voltage Range?
More informationTransients on Integrated Power System
Chapter 3 Transients on Integrated Power System 3.1 Line Dropping and Load Rejection 3.1.1 Line Dropping In three phase circuit capacitance switching, the determination of the voltage trapped after switching
More informationSymmetrical Fault Current Calculations Unlv
We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with symmetrical fault current
More informationEE Branch GATE Paper 2010
Q.1 Q.25 carry one mark each 1. The value of the quantity P, where, is equal to 0 1 e 1/e 2. Divergence of the three-dimensional radial vector field is 3 1/r 3. The period of the signal x(t) = 8 is 0.4
More informationELECTROMAGNETIC OSCILLATIONS AND ALTERNATING CURRENT
Chapter 31: ELECTROMAGNETIC OSCILLATIONS AND ALTERNATING CURRENT 1 A charged capacitor and an inductor are connected in series At time t = 0 the current is zero, but the capacitor is charged If T is the
More informationWeek No. 6 Chapter Six: Power Factor Improvement
Week No. 6 Chapter Six: Power Factor Improvement The electrical energy is almost wholly generated, transmitted and distributed in the form of alternating current. Therefore, the question of power factor
More informationPower System Engineering Prof. Debapriya Das Department of Electrical Engineering Indian Institute of Technology, Kharagpur
Power System Engineering Prof. Debapriya Das Department of Electrical Engineering Indian Institute of Technology, Kharagpur Lecture 41 Application of capacitors in distribution system (Contd.) (Refer Slide
More informationECE 476 Power System Analysis Fall 2014 Exam #1, Thursday, October 2, :30AM - 10:50AM
ECE 476 Power System Analysis Fall 4 Exam #, Thursday, October, 4. 9:3AM - :5AM Name: Problem (5 p) Two balanced 3-phase loads are connected in parallel. One is Y-connected and draws 75 kw (3-phase) at.8
More informationOPTIMAL CAPACITORS PLACEMENT IN DISTRIBUTION NETWORKS USING GENETIC ALGORITHM: A DIMENSION REDUCING APPROACH
OPTIMAL CAPACITORS PLACEMENT IN DISTRIBUTION NETWORKS USING GENETIC ALGORITHM: A DIMENSION REDUCING APPROACH S.NEELIMA #1, DR. P.S.SUBRAMANYAM *2 #1 Associate Professor, Department of Electrical and Electronics
More informationMutual Inductance. The field lines flow from a + charge to a - change
Capacitors Mutual Inductance Since electrical charges do exist, electric field lines have a starting point and an ending point. For example, if you have a + and a - change, the field lines would look something
More informationFatima Michael College of Engineering & Technology
ANNA UNIVERSITY AFFILIATED COLLEGES BE EEE SEMESTER VI EE2353 - HIGH VOLTAGE ENGINEERING UNIT IOVER VOLTAGES IN ELECTRICAL POWER SYSTEMS 1. What is surge arrester? 2. Name the sources of switching surges.
More information12. Introduction and Chapter Objectives
Real Analog - Circuits 1 Chapter 1: Steady-State Sinusoidal Power 1. Introduction and Chapter Objectives In this chapter we will address the issue of power transmission via sinusoidal or AC) signals. This
More informationFault Location in Distribution Feeders with Distributed Generation using Positive Sequence Apparent Impedance
Fault Location in Distribution Feeders with Distributed Generation using Positive Sequence Apparent Impedance ARTURO SUMAN BRETAS Federal University of Rio Grande do Sul Department of Electrical Engineering
More informationGENERATOR INTERCONNECTION APPLICATION
GENERATOR INTERCONNECTION APPLICATION FOR BUY-ALL/SELL-ALL PROJECTS WITH AGGREGATE GENERATOR OUTPUT OF MORE THAN 20 KW BUT LESS THAN OR EQUAL TO 1 MW Electric Utility Contact Information Great Lakes Energy
More information11. AC Circuit Power Analysis
. AC Circuit Power Analysis Often an integral part of circuit analysis is the determination of either power delivered or power absorbed (or both). In this chapter First, we begin by considering instantaneous
More informationOptimal Capacitor Placement and Sizing on Radial Distribution System by using Fuzzy Expert System
274 Optimal Placement and Sizing on Radial Distribution System by using Fuzzy Expert System T. Ananthapadmanabha, K. Parthasarathy, K.Nagaraju, G.V. Venkatachalam Abstract:--This paper presents a mathematical
More informationSSC-JE EE POWER SYSTEMS: GENERATION, TRANSMISSION & DISTRIBUTION SSC-JE STAFF SELECTION COMMISSION ELECTRICAL ENGINEERING STUDY MATERIAL
1 SSC-JE STAFF SELECTION COMMISSION ELECTRICAL ENGINEERING STUDY MATERIAL Power Systems: Generation, Transmission and Distribution Power Systems: Generation, Transmission and Distribution Power Systems:
More informationIncorporation of Asynchronous Generators as PQ Model in Load Flow Analysis for Power Systems with Wind Generation
Incorporation of Asynchronous Generators as PQ Model in Load Flow Analysis for Power Systems with Wind Generation James Ranjith Kumar. R, Member, IEEE, Amit Jain, Member, IEEE, Power Systems Division,
More informationGENERATORS AND LOADS MODELS TO INVESTIGATE UNCONTROLLED ISLANDING ON ACTIVE DISTRIBUTION NETWORKS
GENERATORS AND LOADS MODELS TO INVESTIGATE UNCONTROLLED ISLANDING ON ACTIVE DISTRIBUTION NETWORKS Paolo MATTAVELLI, Riccardo SGARBOSSA Roberto TURRI University of Padova Italy paolo.mattavelli@unipd.it
More information4.2.1 Current, potential difference and resistance
4.2 Electricity Electric charge is a fundamental property of matter everywhere. Understanding the difference in the microstructure of conductors, semiconductors and insulators makes it possible to design
More informationDetection of Broken Conductor with Ground Contact Faults in Medium Voltage Power Networks
FACTA UNIVERSITATIS (NIŠ) SER.: ELEC. ENERG. vol.19, no. 3, December 006, 49-438 Detection of Broken Conductor with Ground Contact Faults in Medium Voltage Power Networks Dumitru Toader, Ştefan Haraguş,
More informationEE5250 TERM PROJECT. Report by: Akarsh Sheilendranath
EE5250 TERM PROJECT Analytical Approaches for Optimal Placement of Distributed Generation Sources in Power System Caisheng Wang, student member, IEEE, and M. Hashem Nehrir, senior member, IEEE Report by:
More informationDynamic Behavior of Three phase Inductions Motors as Loads in an Electric Power System with Distributed Generation, a Case of Study.
Dynamic Behavior of Three phase Inductions Motors as Loads in an Electric Power System with Distributed Generation, a Case of Study. Marcelo Rodrigo García Saquicela, Ernesto Ruppert Filho, José Luis Azcue
More informationEnergy saving in electromechanical equipment with power coefficient correction. Dimitris Al. Katsaprakakis Aeolian Land S.A.
Energy saving in electromechanical equipment with power coefficient correction Dimitris Al. Katsaprakakis Aeolian Land S.A. www.aiolikigi.gr Introduction Electricity production companies (utilities) provide
More informationIn data sheets and application notes which still contain NXP or Philips Semiconductors references, use the references to Nexperia, as shown below.
Important notice Dear Customer, On 7 February 217 the former NXP Standard Product business became a new company with the tradename Nexperia. Nexperia is an industry leading supplier of Discrete, Logic
More informationVOLTAGE stability has become a major concern for the
IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 21, NO. 1, FEBRUARY 2006 171 Continuation-Based Quasi-Steady-State Analysis Qin Wang, Member, IEEE, Hwachang Song, Member, IEEE, and Venkataramana Ajjarapu, Senior
More informationAutomatic Generation Control. Meth Bandara and Hassan Oukacha
Automatic Generation Control Meth Bandara and Hassan Oukacha EE194 Advanced Controls Theory February 25, 2013 Outline Introduction System Modeling Single Generator AGC Going Forward Conclusion Introduction
More informationINSTITUTE OF AERONAUTICAL ENGINERING DUNDIGAL ELECTRICAL AND ELECTRONICS ENGINEERING
INSTITUTE OF AERONAUTICAL ENGINERING DUNDIGAL ELECTRICAL AND ELECTRONICS ENGINEERING Course code : 067(07-08) Course title : High voltage engineering Course structure Lectures Tutorials Practical credits
More informationCircuits Gustav Robert Kirchhoff 12 March October 1887
Welcome Back to Physics 1308 Circuits Gustav Robert Kirchhoff 12 March 1824 17 October 1887 Announcements Assignments for Thursday, October 18th: - Reading: Chapter 28.1-28.2, 28.4 - Watch Video: https://youtu.be/39vkt4cc5nu
More information5-V Low Drop Fixed Voltage Regulator TLE
5-V Low Drop Fixed Voltage Regulator TLE 427-2 Features Output voltage tolerance ±2% 65 ma output current capability Low-drop voltage Reset functionality Adjustable reset time Suitable for use in automotive
More informationQFT Based Controller Design of Thyristor-Controlled Phase Shifter for Power System Stability Enhancement
International Journal of Research in Engineering and Science (IJRES) ISSN (Online): 232-9364, ISSN (Print): 232-9356 Volume 5 Issue 4 ǁ Apr. 27 ǁ PP.54-64 QFT Based Controller Design of Thyristor-Controlled
More informationTransient stability improvement by using PSS and increasing inertia of synchronous machine
American Journal of Electrical Power and Energy Systems 2014; 3(2): 45-49 Published online April 20, 2014 (http://www.sciencepublishinggroup.com/j/epes) doi:10.11648/j.epes.20140302.15 Transient stability
More information