The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform

Hanju Cha - One of the best experts on this subject based on the ideXlab platform.

  • Novel Fast Peak Detector for Single- or Three-phase Unsymmetrical Voltage Sags
    Journal of Electrical Engineering and Technology, 2011
    Co-Authors: Sanghoey Lee, Hanju Cha
    Abstract:

    In the present paper, a novel fast Peak Detector for single- or three-phase unsymmetrical voltage sags is proposed. The proposed Detector is modified from a single-phase digital phase-locked loop based on a d-q transformation using an all-pass filter (APF). APF generates a virtual phase with 90° phase delay. However, this virtual phase cannot reflect a sudden change of the grid voltage in the moment of voltage sag, which causes a Peak value to be significantly distorted and to settle down slowly. Specifically, the settling time of the Peak value is too long when voltage sag occurs around a zero crossing, such as phase 0° and 180°. This paper describes the operating principle of the APF problem and proposes a modified all-pass filter (MAPF) to mitigate the inherent APF problem. In addition, a new fast Peak Detector using MAPF is proposed. The proposed Detector is able to calculate a Peak value within 0.5 ㎳, even when voltage sag occurs around zero crossing. The proposed fast Peak Detector is compared with the conventional Detector using APF. Results show that the proposed Detector has faster detection time in the whole phase range. Furthermore, the proposed fast Peak Detector can be effectively applied to unsymmetrical three-phase voltage sags. Simulation and experimental results verify the advantages of the proposed Detector and MAPF.

  • A new fast Peak Detector for single or three-phase unsymmetrical voltage sags
    2010 IEEE Energy Conversion Congress and Exposition, 2010
    Co-Authors: Sanghoey Lee, Hanju Cha
    Abstract:

    In this paper, a new fast Peak Detector for single or three-phase unsymmetrical voltage sags is proposed. The proposed Detector is modified from a single-phase digital phase-locked loop based on a d-q transformation using an all-pass filter (APF). The all pass filter generates a virtual phase with 90° phase delay but the virtual phase cannot reflect a sudden change of the grid voltage in the moment of voltage sag, which causes a resulted Peak value to be significantly distorted and settle down slowly. Specially, a settling time of the Peak value is too long when voltage sag occurs around zero crossing such as phase 0° and 180°. This paper describes operating principle of the APF problem and proposes a modified all-pass filter (MAPF) to mitigate the inherent APF problem. In addition, a new fast Peak Detector employing the MAPF is proposed and the Detector can calculate Peak value within 0.5 msec even when voltage sag occurs around zero crossing. The proposed fast Peak Detector is compared with the conventional Detector using APF, and shows faster detection time in the whole range of phase. Furthermore, the proposed fast Peak Detector can be effectively applied to unsymmetrical three-phase voltage sags. Simulation and experimental results verify the advantages of the proposed Detector and MAPF.

Sanghoey Lee - One of the best experts on this subject based on the ideXlab platform.

  • Novel Fast Peak Detector for Single- or Three-phase Unsymmetrical Voltage Sags
    Journal of Electrical Engineering and Technology, 2011
    Co-Authors: Sanghoey Lee, Hanju Cha
    Abstract:

    In the present paper, a novel fast Peak Detector for single- or three-phase unsymmetrical voltage sags is proposed. The proposed Detector is modified from a single-phase digital phase-locked loop based on a d-q transformation using an all-pass filter (APF). APF generates a virtual phase with 90° phase delay. However, this virtual phase cannot reflect a sudden change of the grid voltage in the moment of voltage sag, which causes a Peak value to be significantly distorted and to settle down slowly. Specifically, the settling time of the Peak value is too long when voltage sag occurs around a zero crossing, such as phase 0° and 180°. This paper describes the operating principle of the APF problem and proposes a modified all-pass filter (MAPF) to mitigate the inherent APF problem. In addition, a new fast Peak Detector using MAPF is proposed. The proposed Detector is able to calculate a Peak value within 0.5 ㎳, even when voltage sag occurs around zero crossing. The proposed fast Peak Detector is compared with the conventional Detector using APF. Results show that the proposed Detector has faster detection time in the whole phase range. Furthermore, the proposed fast Peak Detector can be effectively applied to unsymmetrical three-phase voltage sags. Simulation and experimental results verify the advantages of the proposed Detector and MAPF.

  • A new fast Peak Detector for single or three-phase unsymmetrical voltage sags
    2010 IEEE Energy Conversion Congress and Exposition, 2010
    Co-Authors: Sanghoey Lee, Hanju Cha
    Abstract:

    In this paper, a new fast Peak Detector for single or three-phase unsymmetrical voltage sags is proposed. The proposed Detector is modified from a single-phase digital phase-locked loop based on a d-q transformation using an all-pass filter (APF). The all pass filter generates a virtual phase with 90° phase delay but the virtual phase cannot reflect a sudden change of the grid voltage in the moment of voltage sag, which causes a resulted Peak value to be significantly distorted and settle down slowly. Specially, a settling time of the Peak value is too long when voltage sag occurs around zero crossing such as phase 0° and 180°. This paper describes operating principle of the APF problem and proposes a modified all-pass filter (MAPF) to mitigate the inherent APF problem. In addition, a new fast Peak Detector employing the MAPF is proposed and the Detector can calculate Peak value within 0.5 msec even when voltage sag occurs around zero crossing. The proposed fast Peak Detector is compared with the conventional Detector using APF, and shows faster detection time in the whole range of phase. Furthermore, the proposed fast Peak Detector can be effectively applied to unsymmetrical three-phase voltage sags. Simulation and experimental results verify the advantages of the proposed Detector and MAPF.

Peter Russer - One of the best experts on this subject based on the ideXlab platform.

  • a novel quasi Peak Detector for time domain emi measurements
    Advances in Radio Science, 2005
    Co-Authors: Florian Krug, Stephan Braun, Peter Russer
    Abstract:

    Abstract. In this paper, an advanced ultra-fast, broadband time domain EMI measurement system is described. Measurements were performed in the 30–1000MHz range. The digital signal processing of EMI measurements allows to emulate in real-time the modes of conventional analogous equipment, e.g. Peak-, Average-, RMS- and Quasi-Peak- Detector. With the presented time domain measurement system the measurement time can be reduced by a factor of 10. A novel signal recording routine for time-domain EMI (TDEMI) measurements and Quasi-Peak-Detection is described. Measurement results obtained from the investigation of a drillmachine, monitor and laptop obtained with the timedomain electromagnetic interference (TDEMI) measurement system are discussed. The results obtained with the described system have been compared with measurements performed with a conventional EMI receiver.

  • Quasi-Peak Detector model for a time-domain measurement system
    IEEE Transactions on Electromagnetic Compatibility, 2005
    Co-Authors: Florian Krug, Peter Russer
    Abstract:

    In this paper, a quasi-Peak Detector mode for a time-domain electromagnetic interference (TDEMI) measurement system is described. Measurements were performed in the 30-1000-MHz range. The digital signal processing of EMI measurements can emulate in real time the modes of conventional analog equipment, e.g., Peak, average, rms, and quasi-Peak Detector. With the presented time-domain measurement system, the measurement time can be reduced by a factor of ten. A novel signal recording routine for TDEMI measurements and quasi-Peak detection is described. Measurement results obtained from the investigation of a drill machine, monitor, and laptop obtained with the TDEMI measurement system are discussed. The comparison of the results obtained with the described TDEMI measurement system and measurements performed with a conventional EMI receiver show an average deviation over the whole frequency range less than 3 dB.

  • a novel automatic digital quasi Peak Detector for a time domain measurement system
    International Symposium on Electromagnetic Compatibility, 2004
    Co-Authors: Stephan Braun, Florian Krug, Peter Russer
    Abstract:

    An advanced ultra-fast broadband time domain EMI (TDEMI) measurement system is presented. Measurements were performed in the 30-1000 MHz range. Using digital signal processing for spectral estimation and detection, the measurement time is reduced by a factor of 10 in comparison to a conventional EMI receiver. A novel recording routine for TDEMI measurement and digital signal processing for proper quasi-Peak detection is described. Different amplitude resolutions are selected during the recording to enhance the dynamic range by about 50 dB. Measurement results are compared with the results obtained with a conventional EMI receiver.

  • A novel digital quasi-Peak Detector for time-domain measurements
    33rd European Microwave Conference 2003, 2003
    Co-Authors: Florian Krug, Stephan Braun, Yuta Kishida, Peter Russer
    Abstract:

    In this paper, an advanced ultra-fast, broadband time domain EMI measurement system is described. Measurements were performed in the 30 - 1000 MHz range. The digital signal processing of EMI measurements allows to emulate in realtime the modes of conventional analogous equipment, e.g. Peak-, Average-, RMS-and Quasi-Peak-Detector. With the presented time domain measurement system the measurement time can be reduced by a factor of 10. A novel signal recording routine for time-domain EMI (TDEMI) measurements and Quasi-Peak-Detection is described. Measurement results obtained from the investigation of a drill machine, monitor and laptop obtained with the time-domain electromagnetic interference (TDEMI) measurement system are discussed. The results obtained with the described system have been compared with measurements performed with a conventional EMI receiver.

Florian Krug - One of the best experts on this subject based on the ideXlab platform.

  • a novel quasi Peak Detector for time domain emi measurements
    Advances in Radio Science, 2005
    Co-Authors: Florian Krug, Stephan Braun, Peter Russer
    Abstract:

    Abstract. In this paper, an advanced ultra-fast, broadband time domain EMI measurement system is described. Measurements were performed in the 30–1000MHz range. The digital signal processing of EMI measurements allows to emulate in real-time the modes of conventional analogous equipment, e.g. Peak-, Average-, RMS- and Quasi-Peak- Detector. With the presented time domain measurement system the measurement time can be reduced by a factor of 10. A novel signal recording routine for time-domain EMI (TDEMI) measurements and Quasi-Peak-Detection is described. Measurement results obtained from the investigation of a drillmachine, monitor and laptop obtained with the timedomain electromagnetic interference (TDEMI) measurement system are discussed. The results obtained with the described system have been compared with measurements performed with a conventional EMI receiver.

  • Quasi-Peak Detector model for a time-domain measurement system
    IEEE Transactions on Electromagnetic Compatibility, 2005
    Co-Authors: Florian Krug, Peter Russer
    Abstract:

    In this paper, a quasi-Peak Detector mode for a time-domain electromagnetic interference (TDEMI) measurement system is described. Measurements were performed in the 30-1000-MHz range. The digital signal processing of EMI measurements can emulate in real time the modes of conventional analog equipment, e.g., Peak, average, rms, and quasi-Peak Detector. With the presented time-domain measurement system, the measurement time can be reduced by a factor of ten. A novel signal recording routine for TDEMI measurements and quasi-Peak detection is described. Measurement results obtained from the investigation of a drill machine, monitor, and laptop obtained with the TDEMI measurement system are discussed. The comparison of the results obtained with the described TDEMI measurement system and measurements performed with a conventional EMI receiver show an average deviation over the whole frequency range less than 3 dB.

  • a novel automatic digital quasi Peak Detector for a time domain measurement system
    International Symposium on Electromagnetic Compatibility, 2004
    Co-Authors: Stephan Braun, Florian Krug, Peter Russer
    Abstract:

    An advanced ultra-fast broadband time domain EMI (TDEMI) measurement system is presented. Measurements were performed in the 30-1000 MHz range. Using digital signal processing for spectral estimation and detection, the measurement time is reduced by a factor of 10 in comparison to a conventional EMI receiver. A novel recording routine for TDEMI measurement and digital signal processing for proper quasi-Peak detection is described. Different amplitude resolutions are selected during the recording to enhance the dynamic range by about 50 dB. Measurement results are compared with the results obtained with a conventional EMI receiver.

  • A novel digital quasi-Peak Detector for time-domain measurements
    33rd European Microwave Conference 2003, 2003
    Co-Authors: Florian Krug, Stephan Braun, Yuta Kishida, Peter Russer
    Abstract:

    In this paper, an advanced ultra-fast, broadband time domain EMI measurement system is described. Measurements were performed in the 30 - 1000 MHz range. The digital signal processing of EMI measurements allows to emulate in realtime the modes of conventional analogous equipment, e.g. Peak-, Average-, RMS-and Quasi-Peak-Detector. With the presented time domain measurement system the measurement time can be reduced by a factor of 10. A novel signal recording routine for time-domain EMI (TDEMI) measurements and Quasi-Peak-Detection is described. Measurement results obtained from the investigation of a drill machine, monitor and laptop obtained with the time-domain electromagnetic interference (TDEMI) measurement system are discussed. The results obtained with the described system have been compared with measurements performed with a conventional EMI receiver.

Stephan Braun - One of the best experts on this subject based on the ideXlab platform.

  • a novel quasi Peak Detector for time domain emi measurements
    Advances in Radio Science, 2005
    Co-Authors: Florian Krug, Stephan Braun, Peter Russer
    Abstract:

    Abstract. In this paper, an advanced ultra-fast, broadband time domain EMI measurement system is described. Measurements were performed in the 30–1000MHz range. The digital signal processing of EMI measurements allows to emulate in real-time the modes of conventional analogous equipment, e.g. Peak-, Average-, RMS- and Quasi-Peak- Detector. With the presented time domain measurement system the measurement time can be reduced by a factor of 10. A novel signal recording routine for time-domain EMI (TDEMI) measurements and Quasi-Peak-Detection is described. Measurement results obtained from the investigation of a drillmachine, monitor and laptop obtained with the timedomain electromagnetic interference (TDEMI) measurement system are discussed. The results obtained with the described system have been compared with measurements performed with a conventional EMI receiver.

  • a novel automatic digital quasi Peak Detector for a time domain measurement system
    International Symposium on Electromagnetic Compatibility, 2004
    Co-Authors: Stephan Braun, Florian Krug, Peter Russer
    Abstract:

    An advanced ultra-fast broadband time domain EMI (TDEMI) measurement system is presented. Measurements were performed in the 30-1000 MHz range. Using digital signal processing for spectral estimation and detection, the measurement time is reduced by a factor of 10 in comparison to a conventional EMI receiver. A novel recording routine for TDEMI measurement and digital signal processing for proper quasi-Peak detection is described. Different amplitude resolutions are selected during the recording to enhance the dynamic range by about 50 dB. Measurement results are compared with the results obtained with a conventional EMI receiver.

  • A novel digital quasi-Peak Detector for time-domain measurements
    33rd European Microwave Conference 2003, 2003
    Co-Authors: Florian Krug, Stephan Braun, Yuta Kishida, Peter Russer
    Abstract:

    In this paper, an advanced ultra-fast, broadband time domain EMI measurement system is described. Measurements were performed in the 30 - 1000 MHz range. The digital signal processing of EMI measurements allows to emulate in realtime the modes of conventional analogous equipment, e.g. Peak-, Average-, RMS-and Quasi-Peak-Detector. With the presented time domain measurement system the measurement time can be reduced by a factor of 10. A novel signal recording routine for time-domain EMI (TDEMI) measurements and Quasi-Peak-Detection is described. Measurement results obtained from the investigation of a drill machine, monitor and laptop obtained with the time-domain electromagnetic interference (TDEMI) measurement system are discussed. The results obtained with the described system have been compared with measurements performed with a conventional EMI receiver.