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© Copyright 2008 ABB. All rights reserved. - 1 - 2/29/2008 Results-Driven Roadshow Cincinnati, 2008 Common Cures for Harmonics Larry Stanley RSE,Nashville,TN
© Copyright 2008 ABB - 2 - Harmonics — What?
© Copyright 2008 ABB - 3 - Non-linear loads draw non-sinusoidal current from a sinusoidal line (current doesn’t look like voltage) : Non-incandescent lighting Computers Uninterruptible power supplies Telecommunications equipment Copy machines Battery chargers Electronic variable speed drives Any load with a solid state AC to DC power converter Harmonics — What?
© Copyright 2008 ABB - 4 - The Real World, 6- Pulse Drive PWM Drive Input Current
© Copyright 2008 ABB - 5 - The Theory: Fundamental, 5 th and 7 th Harmonics Fundamental 5th 7th Components Summation
© Copyright 2008 ABB - 6 - Harmonic Content, 6- Pulse Drive PWM Drive Harmonic Input Spectrum 5th 7th Fundamental 11th 13th
© Copyright 2008 ABB - 7 - Harmonics — Why worry?
© Copyright 2008 ABB - 8 - Harmonic Current Distortion — Added heating in transformers and cables, reduces available capacity May stimulate a PF correction resonance condition Excessive voltage Overheating of capacitors Tripping of protection equipment Shutdown / damage to electronic equipment May cause telephone or electronic interference Harmonics — Why worry?
© Copyright 2008 ABB - 9 - Harmonic Voltage Distortion — Increased heating in motors and other electromagnetic equipment Noisy operation of electromagnetic equipment Malfunction of sensitive electronics Nuisance tripping of electronic circuit breakers Equipment downtime Premature component failures Failed transformers, motors and capacitors Compliance with codes or specifications Harmonics — Why worry? (cont.)
© Copyright 2008 ABB - 10 - Harmonics, Important Terminology (definitions per IEEE 519-1992) Harmonic - A sinusoidal component of a periodic wave or quantity having a frequency that is an integral multiple of the fundamental frequency. Harmonic, characteristic - Those harmonics produced by semiconductor converter equipment in the course of normal operation. h = kq ± 1 k = any integer q = pulse number of the converter Point of common coupling (PCC) Def. 1 - “point of common coupling (PCC) with the consumer-utility interface.” (current harmonic emphasis) Def. 2 - “Within an industrial plant the point of common coupling is the point between the nonlinear load and other loads.” (voltage harmonic emphasis)
© Copyright 2008 ABB - 11 - PCC Example
© Copyright 2008 ABB - 12 - Harmonics, Important Terminology (cont.) I SC /I L - The ratio of the short-circuit current available at the point of common coupling, to the maximum fundamental load current. Total harmonic distortion (THD) or distortion factor - The ratio of the root-mean-square of the harmonic content to the root-mean-square value of the fundamental quantity, expressed as a percent of the fundamental. Total demand distortion (TDD) - The root-sum-square harmonic current distortion, in percent of the maximum demand load current (15 or 30 min demand).
© Copyright 2008 ABB - 13 - Effect of Short Circuit Ratio on Harmonics I SC I L ~ 400 I SC I L ~ 8
© Copyright 2008 ABB - 14 - Harmonics produced by an individual load are only important to the extent that they represent a significant portion of the total connected load (Harmonics are expressed as a percentage) Linear loads help reduce system harmonic levels (percentages) TDD (Total Demand Distortion) equals the THD (Total Harmonic Distortion) of the nonlinear load multiplied by the ratio of nonlinear load to the total (demand) load: Harmonics — A System Issue! Where TDD=TDD of the system THD NL =THD of the nonlinear loads NL=kVA of nonlinear load TL=kVA of total load (nonlinear + linear)
© Copyright 2008 ABB - 15 - Harmonics — By the Numbers IEEE 519 - 1992
© Copyright 2008 ABB - 16 - Harmonics — By the Numbers (cont.) IEEE 519 - 1992 R SC
© Copyright 2008 ABB - 17 - Harmonics — Will it be a problem?
© Copyright 2008 ABB - 18 - Harmonic Voltage, Will it be a problem? THD (Voltage) will be acceptable (<5%) if the % drive load times the % impedance feeding the drive load is <3% %DriveLoad x %Impedance < 3% (Approximate rule of thumb for 6-pulse drives with 3% reactor, all other loads assumed to be linear) E.g. a 45% drive load fed from 6% impedance feeder bus: 45% x 6% = 2.7% 2.7% < 3% Acceptable E.g. a 70% drive load fed from 5% impedance feeder bus: 70% x 5% = 3.5% 3.5% > 3% Not Acceptable
© Copyright 2008 ABB - 19 - Harmonic Current, Will it be a problem? THD (Current) on a network with a short circuit ratio <20 (20<50, 50<100, 100<1000) will be acceptable if the % drive load times 45% is <5% (<8%, <12%, <15%) %DriveLoad x 45% < 5% (R SC <20) %DriveLoad x 45% < 8% (R SC 20<50) %DriveLoad x 45% < 12% (R SC 50<100) %DriveLoad x 45% < 15% (R SC 100<1000) (Rule of thumb for 6-pulse drives with 3% reactor,, all other loads assumed to be linear) E.g. a network with a short circuit ratio of 35 has 15% drive load: 15% x 45% = 6.75% 6.75% < 8% Acceptable E.g. a network with a short circuit ratio of 65 has 30% drive load: 30% x 45% = 13.5% 13.5% > 12% Not Acceptable
© Copyright 2008 ABB - 20 - Harmonics — What can I do?
© Copyright 2008 ABB - 21 - Harmonics — What can I do? Reactors (Chokes) Passive Filters Harmonic Trap Hybrid High Pulse Count Rectification Active Filters Drive Front End Stand Alone
© Copyright 2008 ABB - 22 - Reactors, AC Line or DC Link Different design techniques Equal harmonic reduction for same normalized % reactance Typical full load THD (current) at drive input terminals 28% 46% Existence not position is what is important
© Copyright 2008 ABB - 23 - Reactor Effectiveness Current harmonic content (THD) at drive input terminals as a function of normalized % reactance and network short circuit ratio
© Copyright 2008 ABB - 24 - Swinging Chokes Provide increased inductance at reduced current Reduce harmonics up to 30% more than traditional designs “Swing” portion of choke characteristic significantly improves harmonic performance at reduced loads
© Copyright 2008 ABB - 25 - Swinging DC Link Choke Designed to reduce harmonics at full and partial loads Perfect for Variable Torque Centrifugal Loads Equivalent to 5% line reactor More inductance per volume/weight of material
© Copyright 2008 ABB - 26 - Swinging Choke Vs. Fixed Choke
© Copyright 2008 ABB - 27 - High Pulse Count Rectification Typical configurations are either 12 pulse or 18 pulse Phase shifting transformer is required Additional drive input bridges are needed Typical full load THD (current) at transformer primary 8% 12% (12 pulse), 4% 6% (18 pulse) Performance significantly reduced by line imbalance (voltage or phase) Excellent choice if stepdown transformer is already required
© Copyright 2008 ABB - 28 - High Pulse Count Rectification (cont.) 6 pulse rectifier Transformer (if included) and cabling simple Current quite distorted I thd 32% to 48% with 3% reactor (depending on network impedance) DC/AC Transformer and cabling more complicated Current slightly distorted I thd 8% to 12% (depending on network impedance) 12 pulse rectifier 18 pulse rectifier DC/AC Transformer and cabling complicated Current wave form good I thd 4% to 6% (depending on network impedance)
© Copyright 2008 ABB - 29 - Active Filter Front End with LCL Filter Active Filter Line Inverter (rectifier) removes low frequencies < 1kHz LCL Filter (passive filter) removes high frequencies >1 kHz. (Current and voltage) Full output voltage is available with 80% input voltage (400V In = 480V Out ) Full regenerative capability (ACS800-U11/-17) No transformer required Not affected by line imbalance LCL filter Line inverter (rectifier) Motor inverter Motor LL C M DC Link Drive
© Copyright 2008 ABB - 30 - Beauty Instead of Beast IGBT line supply controls the current Sinusoidal line current Low distortion below switching frequency LCL Line filter removes high frequency distortion Cleans the waveform above switching frequency Diode supply
© Copyright 2008 ABB - 31 - %THD (Voltage) = f(R SC ) 0 1 2 3 4 5 102030405060708090100 R SC Impressive Numbers Total current distortion less than 3.5% to 4.5% Total voltage distortion less than 5% Power factor adjustable from 0.85 (leading or lagging) to 1.0
© Copyright 2008 ABB - 32 - Inverter module Converter module Main switch Main contactor LCL-filter module Active Front End Drive, Construction
© Copyright 2008 ABB - 33 - Product offering Wall-mounted low harmonic drive ACS800-U31 10 – 125 HP Cabinet-built low harmonic drive ACS800-37 75 - 2800 HP
© Copyright 2008 ABB. All rights reserved. - 34 - 2/29/2008 Results-Driven Roadshow Cincinnati, 2008
© Copyright 2008 ABB - 35 -
© Copyright 2008 ABB - 36 - 18-Pulse Impedance and Imbalance Dependencies 18 Pulse with 12 Pulse Performance ULH Clearly Superior
© Copyright 2008 ABB - 37 - Remember! An 80% THD nonlinear load which a will result in only 8% TDD if the nonlinear load is 10% and the linear load is 90%. (80%(10%/(10%+90%))=8%) Harmonic Reduction Summary
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