1 Chapter 3 Harmonic Modeling of Networks Contributors: T. Ortmyer, C. Hatziadoniu, and P. Ribeiro Organized by Task Force on Harmonics Modeling & Simulation.

Slides:



Advertisements
Similar presentations
“Power Factor” In Transmission System
Advertisements

Shunt Capacitor Switching For Power Factor Improvement Clayton H Reid.
Introductory Circuit Analysis Robert L. Boylestad
POWER FACTOR IN ELECTRICAL ENERGY MANAGEMENT
QUALITY AND TECHNOLOGY
Chapter 12 Three Phase Circuits
Chapter 4 Modeling of Nonlinear Load
EMC in Electrical Power Systems Frithiof Jensen Power System Engineer November 12, 2013.
Chapter 12 RL Circuits.
ECE 4411 Determination of Induction-Motor Parameters DC Test –Determines R 1 –Connect any two stator leads to a variable- voltage DC power supply –Adjust.
Today’s Topics 1- The per unit system 2-Transformer Voltage Regulation
Fundamentals of Power Electronics 1 Chapter 19: Resonant Conversion Chapter 19 Resonant Conversion Introduction 19.1Sinusoidal analysis of resonant converters.
Per Unit Representation Load Flow Analysis Power System Stability Power Factor Improvement Ashfaq Hussain.
Power Engineering Society Chicago Chapter Reactive Power: Sources and Solutions 12 February 2003 David E. Mertz, PE Burns & McDonnell Engineers, Inc.
Chapter 12 Three Phase Circuits
Problem Solving Part 2 Resonance.
LOGO LINEAR CIRCUIT ANALYSISSAJID HUSSAIN QAZI MEHRAN U.E.T, KHAIRPUR CAMPUS A.C POWERS AND POWER FACTOR.
Unit 29 Three-Phase Transformers. Objectives: Discuss the construction of three-phase transformers. Discuss the formation of a three-phase transformer.
Transformers.
Fall 2008 Physics 121 Practice Problem Solutions 13 Electromagnetic Oscillations AC Circuits Contents: 121P13 - 2P, 3P, 9P, 33P, 34P, 36P, 49P, 51P, 60P,
Also known as T-  transformations. Objective of Lecture Describe the equations that relate the resistances in a Wye (Y) and Delta (  ) resistor network.
Main article: Leakage inductance
Department of Electrical and Computer Engineering
POWER FACTOR CORRECTION
Transient Overvoltages
PQSynergy TM 2011 Harmonic Assessment of PEA North1, Chiangmai’s Customers in North Industrial Estate Chotepong Pongsriwat. M.Eng(EE) Chief of Power.
Copyright ©2011 by Pearson Education, Inc. publishing as Pearson [imprint] Introductory Circuit Analysis, 12/e Boylestad Chapter 20 Resonance.
LECTURE 27 Controlled Rectifiers Dr. Rostamkolai
STEADY-STATE POWER ANALYSIS
1.6 Real Single-Phase Transformer.
Applied Harmonics Control of Harmonics
AC Generators (Alternators)
Chapter 7 AC Power Analysis
Harmonics and PFC The love story By Pol Nisenblat.
Power System Fundamentals EE 317 Lecture 7 20 October 2010.
Fundamentals of Electric Circuits Chapter 12
Announcements Please read Chapter 3; start on Chapter 6
IEEE PES General Meeting, Tampa FL June 24-28, Chapter 3 Harmonic Modeling of Networks Contributors: T. Ortmyer, C. Hatziadoniu, and P. Ribeiro.
PFC basics EPCOS Power Quality Solutions. PFC basics FK PC PM PFC – Lukas Motta – Jan PFC Basics Ohmic loads Lighting bulbs Iron Resistive heating.
Induction Machine The machines are called induction machines because of the rotor voltage which produces the rotor current and the rotor magnetic field.
Chapter 16 Inductive AC Circuits. Objectives –After completing this chapter, the student should be able to: Describe the phase relationship between current.
EET 221 Synchronous Machines Rafiqi.
Chapter 2 Transformers Edit by Chi-Shan Yu Electric Machinery.
Three Phase Motors Maths
Lecture II Objective: Representation of sequence components
Series and Parallel ac Circuits.
BASIC ELECTRICAL TECHNOLOGY DET 211/3
HARMONICS AND THEIR EFECTS ON POWER SYSTEM PRESENTED BY: S.M.JAFFER-1CR07EE048 IV Year, EEE,BE.
Halliday/Resnick/Walker Fundamentals of Physics 8th edition
Chapters 17 through 23 Midterm Review. Midterm Exam ~ 1 hr, in class 15 questions 6 calculation questions One from each chapter with Ch. 17 and 18 combine.
NEUTRAL CURRENT IS NOT ZERO
Chapter 9 Sinusoids and Phasors
J.PRAKASH.  The term power quality means different things to different people.  Power quality is the interaction of electronic equipment within the.
Chapter 14 Series and Parallel AC Circuits. Objectives Become familiar with the characteristics of a series and parallel ac circuit Find the total impedance.
1 / 24 Analysis of Estimated Problems Using ETAP During Installing a Synchronous Condenser in Wolsong# Young Seung Lee.
Chapter 12 Three Phase Circuits
Ch 4: Transmission Line Calculations
CHAPTER 6 SPECIAL TRANSFORMERS Electrical Machines.
Electric Machine Induction Motor
Principle of Operation
SWAMI VIVEKANAND COLLEGE OF ENGINEERING,INDORE(M.P)
An {image} series circuit has {image} , {image} , and {image}
Advanced Power Systems
Energy Conversion and Transport George G. Karady & Keith Holbert
Energy Conversion and Transport George G. Karady & Keith Holbert
Determination of Induction-Motor Parameters
Energy Conversion and Transport George G. Karady & Keith Holbert
Generator Equations Galore
Chapter 33 Transformer: Three Phase. Chapter 33 Transformer: Three Phase.
Summary of Material on Electric Drives Covered on July 24, 2019
Presentation transcript:

1 Chapter 3 Harmonic Modeling of Networks Contributors: T. Ortmyer, C. Hatziadoniu, and P. Ribeiro Organized by Task Force on Harmonics Modeling & Simulation Adapted and Presented by Paulo F Ribeiro AMSC May 28-29, 2008

2 Distribution System Modeling The initial decisions: - Three phase or single phase modeling - The extent of the primary model - Secondary distribution modelingThree phase or single phase modelingThe extent of the primary modelSecondary distribution modeling The NATURE of the issue and the GOAL of the study constrain these decisions.

3 A Typical Primary Distribution System

4 Things to note Any large or unique loads Capacitor banks/ cables(?) Transmission supply Any unusual operating conditions?

5 Decision 1: Per phase versus Three Phase Modeling  The three phase model is required when:  Single phase or unbalanced capacitors are present  Ground or residual currents are important in the study  Significant unbalanced loading is present  A combination of wye-wye and/or delta-wye transformers leads to harmonic cancellation*

6 The typical instances where a single phase model may be sufficient are:  A single large three phase harmonic source is the cause of the study  The remaining system is well balanced  Ground currents are not an issue

7 Decision 2: The extent of the system model  Model the entire primary system  Transmission source can be modeled by the 60 Hertz short circuit impedance if no significant transmission capacitance is nearby– but check that the transmission system is not a source of harmonics  Power factor capacitors and any distributed generation should be modeled in detail

8 Decision 3: Load and harmonic source modeling  Identify and model all significant harmonic sources  Determine present levels through measurements- also determine if harmonic levels peak at full or light load conditions  Develop aggregate load models based on measurements and load distribution  Validate with measurements taken as harmonic sources/capacitor banks are switched in and out

9 Representative secondary distribution system

10 Characteristics of secondary studies  Different voltage levels  Fewer capacitors, and more with tuning coils  Load data is more accessible- and more important  Measurements can be more economical

11 Modeling transformers Model the transformer connection Neglect the transformer magnetizing branch (usually ignore the transformer magnetizing harmonics) Model the harmonic reactance as the product of short circuit leakage reactance and harmonic number Model the harmonic resistance as the short circuit resistance. Correct for skin effect if data or model available. Include stray capacitance for frequencies above the low khertz range.

12 Line Models Distribution lines and cables should be represented by an equivalent pi. An estimated correction factor for skin effect can be included Model ground path for zero sequence harmonics

13 Capacitors Capacitors– model as capacitive reactance– 60 hertz reactance divided by the harmonic number. Be sure to note those single phase capacitors, and model as such. Model the capacitor as either grounded wye, or ungrounded wye or delta.

14 Load Models Linear Loads Induction and Synchronous Machines Non-linear Loads

15 Linear Passive Loads TYPES: Incandescent lamps, resistive heater, electric range, water heater, space heater, etc. CHARACTERISTICS: RL type loads with RL values independent of frequency.

16 Line Connected MOTOR/GENERATOR LOADS Induction Motor Fundamental Frequency Per Phase Equivalent Circuit

17 IM Per Phase Harmonic Model

18 For synchronous generators, the per phase model of the synchronous generator is similar– use a series combination of stator resistance and substransient reactance in the model. On all direct connected machines, make sure and account for the ground connection (or lack of one) in studies with zero sequence harmonics.

19 Nonlinear Loads Adjustable speed drives fluorescent lamps, computers and other electronic loads arc furnaces and welders These loads generate harmonic currents, and are modeled as sources at the harmonic frequencies

20 Load Model 1: Series Passive Load

21 Load Model 2: Parallel Passive Load

22 Load Model 3. Skin Effect Parallel Load Model

23 Load Model 4. Induction Motor plus Resistive

24 Load Model 5. CIGRE/EDF

25 Load Model 6. Inclusion of Load Transformer and Motor Damping

26 I. Case Study 1: Load Impedance Frequency Study

27 Case Study 1 Parameters Linear Load=743 kW. PF Cap.=741kVAr, (C=5.4  F). Injected Harmonic Currents (A): I 5 = 0.840I 7 = I 11 =0.382I 13 =0.323

28 Case Study 1: Load Model 1, 2, and 3 results

29 Case Study 1: Load Model 4, 5, and 6 Results

30 Sensitivity of Impedance to Motor Penetration Level (Load Model 6, fixed PFC)

31 Sensitivity of Impedance to IM Penetration– w/changing PFC

32 Summary Define study needs Determine the modeling needs Get the data Validate the data Produce good results!!