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Efficient Ripple-Energy-Processing Scheme in Single-Phase Utility Interface
Yasuyuki NISHIDA 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper proposes and describes an efficient<br/> ripple-energy-processing (REP) scheme (i.e., actively compensating low-frequency ripples and smoothing the dcvoltage without an electrolytic capacitor or greatly reduce the capacitance) in single-phase utility interface including PFC rectifiers and utility interactive inverters. The principle and the practical realization including experimental results in the singlephase buck-boost PFC rectifier as an example have been presented.
Passive PFC converter for energy saving
Yasuyuki NISHIDA,Hiromichi OYAMA 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
An efficient and cheap three-phase diode PFC rectifier for energy saving in several power electronics applications is practically evaluated with 12㎾ setup. The topology and several experimental data are described to show the practicability of the rectifier.
Overmodulation Strategy of NPC Type 3-Level Inverter for Traction Drives
Jaemoon Lee,Jaeho Choi,Yasuyuki Nishida 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper proposes an overmodulation method for improving the voltage utilization of NPC type 3-level inverter for traction drives. The conventional railway vehicle has used a vector control to MI=0.907 and a slip-frequency control from MI=0.907 to the six-step mode. The slip-frequency control has less output torque dynamics than the vector control. In this paper, the linear region of NPC type 3-level inverter output voltage is extended to the six-step mode by using overmodulation strategy. As a result, vector control can be adapted in the whole regions and it leads to better output torque dynamics comparing with the conventional slip frequency control in overmodulation region. The overmodulation range is divided into two modes depending on the modulation index (MI), In the overmodulation region Ⅰ, the reference angles are derived from the Fourier series expansion of the reference voltage corresponds to the MI. In the overmodulation region Ⅱ, the holding angles are also derived in the same way. Therefore, it is possible to obtain the linear control and the maximized utilization of PWM inverter output voltage.
Reduction of Circulating Current of Double Converter Configuration for Additional Regeneration
Noriyuki Kimura,Toshimitsu Morizane,Yasuyuki Nishida 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents the analysis and solution about the circulating current appeared in the double converter configuration used to add the regenerative ability for a conventional diode rectifier.
Three-Phase PFC Rectifier by Means of Three Single-Phase Passive PFC Units
Shin-ich MOTEGI,Yasuyuki NISHIDA 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This study deals with a three-phase diode rectifier which offers very fine PFC nature. The rectifier consists of three units of single-phase PFC diode rectifier with L-C network on the ac input side. Most of all practically available combinations of inductance and capacitance of the L-C network have been investigated through simulations and useful combinations and performance of the new rectifier are obtained and described in this paper. According to the simulation studies, the Total-Power-Factor of the input is more than 99 [%] and Total-Harmonic-Distortion of input current is approximately 3 [%]. It is shown in this paper that the new rectifier is practically advantageous than ordinary rectifier, e.g., three-phase bridge diode rectifier, and even well comparable to double three-phase bridge diode rectifier.
Dynamic Characteristics of DC-DC Converters Using Digital Filters
Kurokawa, Fujio,Okamatsu, Masashi,Ishibashi, Taku,Nishida, Yasuyuki The Korean Institute of Power Electronics 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3
This paper presents the dynamic characteristics of buck and buck-boost dc-dc converters with digital filters. At first, the PID, the minimum phase FIR filter and the IIR filter controls are discussed in the buck dc-dc converter. Comparisons of the dynamic characteristics between the buck and buck-boost converters are then discussed. As a result, it is clarified that the superior dynamic characteristics are realized in the IIR filter method. In the buck converter, the undershoot is less than 2% and the transient time is less than 0.4ms. On the other hand, in the buck-boost converter, the undershoot is about 3%. However, the transient time is approximately over 4ms because the output capacitance is too large to suppress the output voltage ripple in this type of converter.
Dynamic Characteristics of DC-DC Converters Using Digital Filters
Fujio Kurokawa,Masashi Okamatsu,Taku Ishibashi,Yasuyuki Nishida 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3
This paper presents the dynamic characteristics of buck and buck-boost dc-dc converters with digital filters. At first, the PID, the minimum phase FIR filter and the IIR filter controls are discussed in the buck dc-dc converter. Comparisons of the dynamic characteristics between the buck and buck-boost converters are then discussed. As a result, it is clarified that the superior dynamic characteristics are realized in the IIR filter method. In the buck converter, the undershoot is less than 2% and the transient time is less than 0.4ms. On the other hand, in the buck-boost converter, the undershoot is about 3%. However, the transient time is approximately over 4ms because the output capacitance is too large to suppress the output voltage ripple in this type of converter.