Frankfurt (Germany), 6-9 June 2011 Vladimir Ćuk, Sjef Cobben, Wil L. Kling*, Roelof B. Timens TU Eindhoven – The Netherlands, Universiteit Twente.

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Presentation transcript:

Frankfurt (Germany), 6-9 June 2011 Vladimir Ćuk*, Sjef Cobben*, Wil L. Kling*, Roelof B. Timens** TU Eindhoven – The Netherlands, ** Universiteit Twente – The Netherlands Presenter: Dr.ir. G.M.A. Vanalme TU Eindhoven The Netherlands Session: Power Quality and Electromagnetic Compatibility Paper 0580 ANALYSIS OF HARMONIC CURRENT INTERACTION IN AN INDUSTIAL PLANT

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Introduction  Current transients in the factory lighting system  A Variable Speed Drive (VSD) is causing voltage notches  Possible resonance?

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Lamp current in one phase

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Current in all three regimes

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Voltage in all three regimes

Frankfurt (Germany), 6-9 June 2011 Paper 0580 THDs over 20 ms periods

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Voltage harmonics

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Current harmonics Broadband distortion – not a resonance problem

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Calculated load impedance Low impedance at high orders causes high currents Cable inductance increases the impedance at the end of the plot

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Laboratory measurements Current with a clean voltage supply Peak current 3 A

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Current spectrum with a clean voltage 3 rd harmonic 5 th harmonic

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Simulated low distortion condition Peak current 4 A

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Simulated higher voltage distortion Peak current 9 A

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Simulated highest voltage distortion Peak current up to 20 A More oscillations than in the field – limited bandwidth of the source

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Harmonic fingerprint – 3 rd harmonic Current harmonics even with a clean voltage, but linear response to voltage harmonics!

Frankfurt (Germany), 6-9 June 2011 Paper 0580 Lamp impedance – lab. measurement Fitted curve C = 47.7 μF

Frankfurt (Germany), 6-9 June 2011  A parallel resonance is not being excited  Peaks are caused buy harmonic distortion – notch shape is not important, similar behavior with other shapes  These lamps create harmonics, but react linearly to voltage harmonics – parallel capacitance (compensation)  Solution – electrical separation Paper 0580 Conclusions