Noise Mitigation in HV Tests Sourced by A Static Frequency Converter by Means of Changing PWM Signal’s Carrier Frequency
Conference: PCIM Europe 2017 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/16/2017 - 05/18/2017 at Nürnberg, Deutschland
Proceedings: PCIM Europe 2017
Pages: 4Language: englishTyp: PDF
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Authors:
Alzatari, Mazen; Szczechowski, Janusz (ABB AG, Halle, Germany)
Abstract:
In many High Voltage (HV) and Low Voltage (LV) applications, during production process, for quality assurance, a Partial Discharge (PD) measurements have to be accomplished with a very low PD background noise. When the tested object is fed by a power electronic DC-AC converter, such as the ABB on site test system, the Pulse Width Modulation (PWM) signal’s carrier frequency harmonics will interfere the PD measurements bandwidth (100 to 400 kHz) as a background noise according to the standard IEC 60270. Reducing the PD background noise by changing the PWM carrier frequency is presented in this work as well as the influence of carrier frequency on the Total Harmonic Distortion (THD) of the DC-AC converter output signal. This research work shows that increasing the PWM carrier frequency will probably decrease the PD background noise and increase the stability of the converter output signal, furthermore it influences the THD as the results shows in this paper.