Peteris Spels, ABB Inc., WMEA, November 18, 2011 HARMONICS. ABB Group December 14, 2011 Slide 1
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1 Peteris Spels, ABB Inc., WMEA, November 18, 2011 HARMONICS December 14, 2011 Slide 1
2 Agenda Harmonics: What they are? Where do they come from? Why bother? Regulations How to detect? How to avoid? Summary December 14, 2011 Slide 2
3 What are harmonics? Some math/ history Every Periodic Function can be represented as a Sum of Infinite number of other periodic functions These other functions are called HARMONICS Joseph Fourie; 1807 HARMONICS : Periodic distortions in power supply December 14, 2011 Slide 3
4 [%] What are harmonics? Some Math 1.4 % 1.2 % 1.0 % 0.8 % 0.6 % 0.4 % 0.2 % 0.0 % Harmonic order In/I1 Un/U1 December 14, 2011 Slide 4
5 Where do they come from? Example L + L1 L2 C U d Load L3 - December 14, 2011 Slide 5
6 Where do they come from? Propagation December 14, 2011 Slide 6 IMPORTANT: Xc and XL
7 Where do they come from? Sources Any load, drawing non-sinusoidal current (non-linear loads) Rectifiers DC drives VFD Welding machines DC power supplies (24V etc.) Static Var Compensators Energy Saving Lights Fluorescent Etc. etc. December 14, 2011 Slide 7
8 Why bother? An important question WHY? EXAMPLE : Transformer Weird magnetic flux Additional heat (losses) Increased temperatures Reduced life Most important question: how critical the harmonics are, and at what level problems will start December 14, 2011 Slide 8
9 Why bother? Effects of harmonics Neutral conductor overheating December 14, 2011 Slide 9
10 Why bother? Effects of harmonics PFC capacitor overload December 14, 2011 Slide 10
11 Why bother? Effects of harmonics Resonance conditions December 14, 2011 Slide 11
12 Why bother? Effects of harmonics Rotating Machines Additional heating (losses) Reduced life Power loss Torque oscillations / pulsations Benefit: motors dampen harmonics December 14, 2011 Slide 12
13 Why bother? Effects of harmonics PFC capacitor overload Additional losses (costs, heat) Increased transformer temperatures (reduced life) Nuisance tripping of breakers etc Malfunction of electronics, sensors Impact on rotating machinery December 14, 2011 Slide 13
14 Regulations IEEE Technical document good source of information Voluntary, not a standard or code Recommendations of mitigation and limits IEC series Code a must comply for overseas manufacturers, utilities and users Electro-Magnetic Compatibility (EMC) covers all electromagnetic phenomena, including nuclear bomb explosion effects (HEMP) Compatibility, rather than limits equipment must be able to withstand disturbances, power supply must comply to quality standards December 14, 2011 Slide 14
15 How to detect? Measure! Keywords: Power quality analyzer, Power quality recorder Power meter/ analyzer / recorder December 14, 2011 Slide 15
16 How to avoid? Engineer them out! Design studies (power flow) Selection of right equipment Transformers Drive technology Filtering measures Short Circuit Capacity Power factor control If already there: Filtering Defeat at the source Smart measures case specific December 14, 2011 Slide 16
17 Comparison of Technologies IGBT supply 12 - pulse 6 - pulse 6 pulse I THD = 30 % U THD RSC= 20 = 10 % U THD RSC=100 = 2 % cos total = 0,93...0,95 IHD=7,78 Current harmonics, 12-pulse rectifier 12 pulse I THD = 12 % U THD RSC= 20 = 7 % U THD RSC=100 =1,4 % cos total = 0,93...0,95 IHD=2,05 Current harmonics, IGBT Line converter IGBT Supply unit I THD = 4 % U THD RSC= 20 = 3 % U THD RSC=100 =0,8 % cos 1 = 1 cos total = 0,99
18 How to avoid? Example design study Power study Goal: IEE519 compliance at 115kV Greenfield site AC dragline proposed December 14, 2011 Slide 18
19 How to avoid? Example design study Grid modeling Impedance sweep (frequencies) Recommendations what to do Every grid has a resonant frequency! December 14, 2011 Slide 19
20 [%] How to avoid? Example design study 1.4 % 1.2 % 1.0 % 0.8 % 0.6 % 0.4 % 0.2 % 0.0 % Harmonic order In/I1 Un/U1 December 14, 2011 Slide 20
21 How to avoid? Example design study December 14, 2011 Slide 21
22 How to avoid? Example design study Solution pick a different cable! December 14, 2011 Slide 22
23 How to avoid? Example design study In both cases levels at 115kV BUS negligible The single frequency overshoot present only in the trail cable and at the secondary of dragline substation transformer at 22kV. Potentially if other equipment connected to that bus would have seen some minute voltage distortions. December 14, 2011 Slide 23
24 How to avoid? Filtering Two types of filters Passive Active December 14, 2011 Slide 24
25 How to avoid? Filtering Active filter example shovel I_ISU I_DSU I_LINE December 14, 2011 Slide 25
26 SUMMARY Harmonics distortions in power supply represented in frequency domain (other harmonic, periodic functions) Harmonics are created by nonlinear loads (rectifiers, etc.) They are always there Problems: heating/losses, reduced life, nuisance trips, capacitor overloading, rare cases torque oscillations Solutions: Engineer them out Proper technology Filtering December 14, 2011 Slide 26
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