The Experts below are selected from a list of 87648 Experts worldwide ranked by ideXlab platform

Naoya Nakajima - One of the best experts on this subject based on the ideXlab platform.

  • electronic frequency converter feeding single Phase Circuit and controlling feeder voltage with fixed power factor method for shinkansen
    IEEE Transactions on Power Electronics, 2012
    Co-Authors: Ken Kunomura, Mitsuru Onishi, Masahiko Kai, Naotaka Iio, Midori Otsuki, Yoshinori Tsuruma, Naoya Nakajima
    Abstract:

    In the Tokaido Shinkansen, the instantaneous feeding power of substations has increased because of the high-density train schedule and the improved acceleration performance of the rolling stock. If the load power of feeding substations increases any further, it will not be possible to maintain the feeder voltage when the power converter supplies only reactive power. In consideration of such a situation in the frequency conversion section, an electronic frequency converter that controls the ac voltage using a fixed power factor method was developed. The superiority of the proposed control method is confirmed with electromagnetic transient program calculations and field test results. The electronic frequency converter has been in operation since February 2009 with good performance, showing the success of the system development described in this paper.

  • electronic frequency converter feeding single Phase Circuit for shinkansen
    The International Power Electronics Conference - ECCE ASIA, 2010
    Co-Authors: Ken Kunomura, Mitsuru Onishi, Masahiko Kai, Naotaka Iio, Midori Otsuki, Yoshinori Tsuruma, Naoya Nakajima
    Abstract:

    In the Tokaido Shinkansen, the instantaneous feeding power of substations increases because of the high-density train schedule and the improved acceleration performance of the rolling stock. If the load power of feeding substations increases further, it will not be possible to maintain the feeder voltage if the power converter supplies only reactive power. Assuming such a situation in the frequency conversion section, we developed an electronic frequency converter that controls the AC voltage using a fixed power factor method. The electronic frequency converter is installed in the Numazu frequency conversion substation. Here we describe the superiority of AC voltage control using the fixed power factor method.

Zhang Xiufeng - One of the best experts on this subject based on the ideXlab platform.

  • a harmonics detection method based on average power theory in single Phase Circuit
    Electrical Measurement & Instrumentation, 2011
    Co-Authors: Zhang Xiufeng
    Abstract:

    In order to meet the demand of detecting harmonics and reactive currents when the voltage distortion,a detecting method based on average active power definition is drawn in this paper.Testified through analysis and simulation,this method is proved to detect instantaneous reactive currents,fundamental reactive current and harmonics in single-Phase Circuit,and without PLL in the detection of only instantaneous reactive currents.Compared with other methods based on the theory of instantaneous reactive power,this method is simpler and easier.

  • a harmonics detetion method without pll and based on average theory in three Phase Circuit
    Electrical Measurement & Instrumentation, 2010
    Co-Authors: Zhang Xiufeng
    Abstract:

    In order to reduce the error of the Phase lock loop(PLL) and compensate the delay of the low pass filter on harmonics detection,in the paper,a new detecting method based on the instantaneous reactive power theory in three-Phase Circuit is researched.The PLL is omitted and average theory is used in this method so that the problem of detecting accuracy induced by PLL and real-time induced by LPF is solved,the detection accuracy is improved and the speed of dynamic response is accelerated.

  • a harmonics detetion method without pll and based on average theory in single phese Circuit
    Power System Protection and Control, 2010
    Co-Authors: Zhang Xiufeng
    Abstract:

    In order to reduce the error of the Phase lock loop(P LL) a nd compensate the delay of the low pass filter(LPF) on harmonics detection,the method of separating active currents in single-Phase Circuit is studied deeply and a new detecting method is proposed.T he PLL is omitted and average theory is used in this method,s o that the problem of detecting accuracy induced by PLL and real-time induced by LPF is solved,the detection accuracy is improved and the speed of dynamic response is accelerated.It is testified through analysis and simulation,that the method has little delay time and has a good real-time quality.

Ken Kunomura - One of the best experts on this subject based on the ideXlab platform.

  • electronic frequency converter feeding single Phase Circuit and controlling feeder voltage with fixed power factor method for shinkansen
    IEEE Transactions on Power Electronics, 2012
    Co-Authors: Ken Kunomura, Mitsuru Onishi, Masahiko Kai, Naotaka Iio, Midori Otsuki, Yoshinori Tsuruma, Naoya Nakajima
    Abstract:

    In the Tokaido Shinkansen, the instantaneous feeding power of substations has increased because of the high-density train schedule and the improved acceleration performance of the rolling stock. If the load power of feeding substations increases any further, it will not be possible to maintain the feeder voltage when the power converter supplies only reactive power. In consideration of such a situation in the frequency conversion section, an electronic frequency converter that controls the ac voltage using a fixed power factor method was developed. The superiority of the proposed control method is confirmed with electromagnetic transient program calculations and field test results. The electronic frequency converter has been in operation since February 2009 with good performance, showing the success of the system development described in this paper.

  • electronic frequency converter feeding single Phase Circuit for shinkansen
    The International Power Electronics Conference - ECCE ASIA, 2010
    Co-Authors: Ken Kunomura, Mitsuru Onishi, Masahiko Kai, Naotaka Iio, Midori Otsuki, Yoshinori Tsuruma, Naoya Nakajima
    Abstract:

    In the Tokaido Shinkansen, the instantaneous feeding power of substations increases because of the high-density train schedule and the improved acceleration performance of the rolling stock. If the load power of feeding substations increases further, it will not be possible to maintain the feeder voltage if the power converter supplies only reactive power. Assuming such a situation in the frequency conversion section, we developed an electronic frequency converter that controls the AC voltage using a fixed power factor method. The electronic frequency converter is installed in the Numazu frequency conversion substation. Here we describe the superiority of AC voltage control using the fixed power factor method.

Birgitte Bak-jensen - One of the best experts on this subject based on the ideXlab platform.

  • Spectral analysis of instantaneous powers in single-Phase and three-Phase systems with use of p-q-r theory
    IEEE Transactions on Power Electronics, 2002
    Co-Authors: Hyosung Kim, Frede Blaabjerg, Birgitte Bak-jensen
    Abstract:

    Three linearly independent instantaneous powers have been defined in the time domain in three-Phase four-wire systems with the use of p-q-r theory. Any three-Phase Circuit can be transformed into three single-Phase Circuits by the p-q-r transformation. Thus the instantaneous powers in any three-Phase systems can be analyzed as the same way of instantaneous power in single-Phase systems. This paper analyzes the instantaneous powers spectrally in the frequency domain for single-Phase systems and three-Phase systems. Each instantaneous power in three-Phase systems has its own spectral pattern that is characterized by the spectral distribution of the system voltages and currents. The instantaneous power in single-Phase systems has its own spectral pattern different from that of three-Phase systems. From the spectral analysis of the instantaneous powers, powers are newly defined in the frequency domain. The definition of the powers is consistent through single-Phase systems and three-Phase systems and agrees well with the traditional definition of powers in sinusoidal single-Phase systems. Based on the defined powers, some useful power quality factors are defined to evaluate power qualities for various Circuit conditions.

Mitsuru Onishi - One of the best experts on this subject based on the ideXlab platform.

  • electronic frequency converter feeding single Phase Circuit and controlling feeder voltage with fixed power factor method for shinkansen
    IEEE Transactions on Power Electronics, 2012
    Co-Authors: Ken Kunomura, Mitsuru Onishi, Masahiko Kai, Naotaka Iio, Midori Otsuki, Yoshinori Tsuruma, Naoya Nakajima
    Abstract:

    In the Tokaido Shinkansen, the instantaneous feeding power of substations has increased because of the high-density train schedule and the improved acceleration performance of the rolling stock. If the load power of feeding substations increases any further, it will not be possible to maintain the feeder voltage when the power converter supplies only reactive power. In consideration of such a situation in the frequency conversion section, an electronic frequency converter that controls the ac voltage using a fixed power factor method was developed. The superiority of the proposed control method is confirmed with electromagnetic transient program calculations and field test results. The electronic frequency converter has been in operation since February 2009 with good performance, showing the success of the system development described in this paper.

  • electronic frequency converter feeding single Phase Circuit for shinkansen
    The International Power Electronics Conference - ECCE ASIA, 2010
    Co-Authors: Ken Kunomura, Mitsuru Onishi, Masahiko Kai, Naotaka Iio, Midori Otsuki, Yoshinori Tsuruma, Naoya Nakajima
    Abstract:

    In the Tokaido Shinkansen, the instantaneous feeding power of substations increases because of the high-density train schedule and the improved acceleration performance of the rolling stock. If the load power of feeding substations increases further, it will not be possible to maintain the feeder voltage if the power converter supplies only reactive power. Assuming such a situation in the frequency conversion section, we developed an electronic frequency converter that controls the AC voltage using a fixed power factor method. The electronic frequency converter is installed in the Numazu frequency conversion substation. Here we describe the superiority of AC voltage control using the fixed power factor method.