IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 137 , Issue 2
Showing 1-29 articles out of 29 articles from the selected issue
Special Issue on “JIASC 2016”
Special Issue Paper
  • Shinji Shinnaka
    2017 Volume 137 Issue 2 Pages 75-86
    Published: February 01, 2017
    Released: February 01, 2017
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    This paper proposes a new three-phase permanent-magnet synchronous motor that has new double three-phase windings. Each of the windings is arranged inversely in terms of space, and has a π rad phase shift to the other winding for a four-pole case. Even if one of the windings is damaged and shut down, the motor can continue to operate properly using the remaining healthy winding. The motor has a high fault tolerance and functional safety. The windings can have two different winding numbers of turns so that the motor can be driven efficiently in a wide range of speeds. The motor is suitable for use in passenger vehicles in accordance with “ISO 26262.” In addition to this new arrangement of double windings, this paper proposes a new dynamic mathematical model, and a new vector simulator for the motor, which are indispensable for the design of drive control systems.

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  • Tooru Suhara, Hiromu Norizuki, Yutaka Uchimura
    2017 Volume 137 Issue 2 Pages 87-94
    Published: February 01, 2017
    Released: February 01, 2017
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    In this paper, a control system design that considers packet losses and time delay in a network-based control system is proposed. A conventional communication observer is exploited to compensate for time delay; however, it does not consider packet losses. Furthermore, when a modeling error exists, steady-state errors occur. Therefore, in order to compensate for the packet loss and the modeling error, a model error feedback system that does not include time delay is proposed. The proposed system was evaluated by numerical simulations with model error and packet loss.

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  • Ryosuke Ota, Nobukazu Hoshi, Kosuke Uchida
    2017 Volume 137 Issue 2 Pages 95-103
    Published: February 01, 2017
    Released: February 01, 2017
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    The switching frequency affects the efficiency of a secondary-side converter that is configured with a diode bridge rectifier connected to a DC-DC converter in an inductive power transfer (IPT) system. The efficiency characteristics for the switching frequency of a secondary-side converter were analyzed theoretically in order to establish a highly efficient control scheme the controls the switching frequency of the converter. A control scheme is proposed in which the switching frequency of the secondary-side converter is controlled according to the efficiency characteristics. The validity of the proposed control scheme was clarified through experiments. The results showed that the proposed control scheme improved the efficiency of the IPT system by 3.4 points compared to the conventional control scheme.

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  • Katsuhiro Hata, Takehiro Imura, Yoichi Hori
    2017 Volume 137 Issue 2 Pages 104-111
    Published: February 01, 2017
    Released: February 01, 2017
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    A dynamic wireless power transfer system is expected to extend the limited driving distance of electric vehicles. Because the transmitting efficiency changes according to the vehicle motion with dynamic charging, developing a control strategy for maximizing the efficiency is one of the most important issues. Previous research has proposed secondary-side control based on estimating the coupling coefficient between a transmitter and receiver to simplify the ground facilities, which would be applied to rugged roadways over long distances. However, the primary voltage and internal resistance of the transmitter have to be strictly designed to achieve maximum efficiency control on the secondary side. In order to ease these restrictions, this paper proposes a multi-parameter estimation method based on secondary-side information. Simultaneous estimation of the primary voltage and mutual inductance mitigates voltage control on the primary side and ensures compatibility with different systems. Simultaneous estimation of the transmitter resistance and mutual inductance tolerates a variety of transmitter specifications. The effectiveness of the proposed method and its applicability to secondary-side control were demonstrated in simulations and experiments.

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  • Naoya Yamashita, Ken-ichi Sakakibara
    2017 Volume 137 Issue 2 Pages 112-118
    Published: February 01, 2017
    Released: February 01, 2017
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    This paper proposes a new control method and circuit configuration of a single-phase-to-three-phase power converter with an active buffer and a charge circuit to increase output voltage. By supplying the charge circuit with half of the single-phase electric power and increasing the duty ratio of the discharge circuit, the transfer ratio between the input and output voltages can be set to 0.8-1 theoretically. The validity of the proposed control method was confirmed in experiments.

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  • Kazuhiro Shirakawa, Akira Tokumasu, Masaya Takahashi, Takahiro Tera, H ...
    2017 Volume 137 Issue 2 Pages 119-128
    Published: February 01, 2017
    Released: February 01, 2017
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    This paper proposes a new method to suppress surge voltage on diodes used in the rectifier circuit of push-pull type DC-DC converters. In cases in which the rectifier circuit is connected to the center-tapped winding of a transformer, a large surge voltage amplitude appears on the rectifier diodes, owing to commutating operations. Conventionally, an RC-type snubber circuit is connected to the diodes; however, this results in large amounts of power loss on the snubber circuit and causes a significant reduction in the overall conversion efficiency of the power converter. In order to overcome these problems, this paper proposes a new surge suppression method. In this method, the magnetizing current flowing in the secondary winding of the transformer is transferred to the primary winding during the commutating period, and the current flowing through the output capacitance of the rectifier diode to turn off is absorbed. Hence, the surge voltage on the rectifier diode is reduced, and the surge voltage on the switching devices connected to the primary winding of the center-tapped transformer is also reduced. The effectiveness of the proposed method is verified through a 3kW experimental setup; a high efficiency rate of 98.5% was achived, and surge voltage was minimized on all switching devices.

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Paper
  • Daisuke Yamaguchi, Natsuki Terada, Tomoichi Shibata, Rinichi Yokota, Y ...
    2017 Volume 137 Issue 2 Pages 129-140
    Published: February 01, 2017
    Released: February 01, 2017
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    The Hokuriku Shinkansen line is driven by an AC traction system. A special feature of this line is its division into 50- and 60-Hz power frequency sections. In the linking section where the two different frequencies of the AC feeding system meet, the induced current causes electromagnetic interference with ATC.

    Therefore, the traction circuit and the composition of the track circuits were arranged to be immune to this interference, and a predictive calculation of the induced current for ATC was carried out. The calculation results indicated the possibility that the induced current exceeds the allowable value. However, the electromagnetic screening effect of the conductors in the structures was not accounted for in the calculation.

    To enable accurate predictions of the induced current for ATC, we improve the predictive calculation of the induction by suggesting a method for modeling structures.

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  • Tomoyuki Mannen, Issei Fukasawa, Hideaki Fujita
    2017 Volume 137 Issue 2 Pages 141-147
    Published: February 01, 2017
    Released: February 01, 2017
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    This paper proposes a new control method suitable for active power filters, which can reduce the dc capacitor voltage ripple associated with the third-order harmonic current compensation. The proposed method superimposes a negative-sequence fundamental current on the compensating current to cancel out the active power ripple caused by the third-order harmonic current. As a result, the proposed method has the capability to eliminate the dc capacitor voltage ripple oscillating at double the source frequency. Experimental results obtained by a 10-kW three-phase diode rectifier load verify the validity of the proposed method. The proposed method exhibits a small dc capacitor voltage ripple reduced to 43% of that using the conventional method.

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  • Masakazu Kato, Jun-ichi Itoh
    2017 Volume 137 Issue 2 Pages 148-158
    Published: February 01, 2017
    Released: February 01, 2017
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    In this paper, the stability of a current regulator for high-speed interior permanent magnet synchronous motor (IPMSM) drives under the motor parameter mismatch condition is analyzed. As a result, a fundamental decoupling control between d-axis and q-axis causes instability when the natural angular frequency of a current regulator is low under the motor parameter mismatch. The conventional method requires a low-pass filter that has an electrical time constant in order to achieve compensation for the d-q axis coupling components. However, it is difficult to implement the filter because the carrier frequency is limited by the total efficiency of the motor drive systems. Therefore, this paper also proposes a stabilization method for the current regulator based on an equivalent resistance gain in order to overcome this instability. One of the features in this paper is no use of the filter. In addition, the proposed method reduces the current overshoot by 1.1p.u. compared with the fundamental decoupling control.

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  • Daisuke Shimode, Toshiaki Murai, Yuki Kashiwagi, Tadashi Sawada
    2017 Volume 137 Issue 2 Pages 159-167
    Published: February 01, 2017
    Released: February 01, 2017
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    Primary and secondary circuits in railway wireless power transfer (WPT) systems have control systems to maintain constant primary current and constant secondary output power. Their control systems lack quick response capability because the primary and secondary circuits utilize LC circuits to smooth the DC output voltage of rectifiers. Therefore, the stability of railway WPT systems utilizing multiple secondary coils should be studied. However, it is difficult to analyze transfer function in non-linear WPT systems and to conduct frequent experiments utilizing actual railway vehicles. Therefore, a linearized model of a non-linear WPT system utilizing an imaginary dq transformation is proposed. In addition, this paper examines the relationship between the stability of the WPT system and the number of operating secondary coils by calculating the pole assignment. Moreover, an experimental model of a railway WPT system that is required to supply several hundred kW of power for railway vehicles is proposed to experimentally examine the stability of railway WPT systems.

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  • Masato Ando, Keiji Wada
    2017 Volume 137 Issue 2 Pages 168-174
    Published: February 01, 2017
    Released: February 01, 2017
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    Recently, high-speed switching circuits using SiC power devices have been developed for next-generation power electronics circuits and applied to actual traction systems in Japan. Stray inductances caused by DC capacitors, bus bars and power devices are one of the most critical parameters that influences over-voltage and switching loss. This paper presents an investigation into the influence of stray inductance on the switching performance of power devices. In particular, this paper focuses on the effects of stray inductance on both turn-on loss and turn-off loss, and can be estimated using the proposed impedance ratio method of the stray inductance. To verify the proposed procedure, experimental results are demonstrated using an all-SiC power module.

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  • Yuhei Okazaki, Shun Shioda, Hirofumi Akagi
    2017 Volume 137 Issue 2 Pages 175-182
    Published: February 01, 2017
    Released: February 01, 2017
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    This paper provides an experimental discussion on dynamic braking for an induction motor driven by a modular multilevel double-star chopper-cell (DSCC) inverter, intended for applications to large-capacity fans and compressors. Each chopper cell consists of a bidirectional chopper and a braking chopper connecting a single small-rated braking resistor in series with a single IGBT (Insulated-Gate Bipolar Transistor). Thus, this configuration leads to a “distributed” dynamic-braking system that provides the practical welcome byproduct of overvoltage protection to each chopper cell. This paper describes a unified control method of the DSCC inverter and all the braking choppers. An experimental induction-motor-drive system rated at 400V and 15kW is designed, constructed, and tested to verify the dynamic-braking performance. Experimental waveforms, along with simulated waveforms, confirm that the distributed dynamic-braking system is feasible and effective in a medium-voltage high-power DSCC inverter for an electric motor drive having large-capacity fans and compressors.

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  • Masataka Minami, Takumi Yasuda, Shin-ichi Motegi, Masakazu Michihira
    2017 Volume 137 Issue 2 Pages 183-187
    Published: February 01, 2017
    Released: February 01, 2017
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    The Cockcroft-Walton (CW) circuit, which is well known as a high step-up rectifier, is used in a lot of systems. The boost ratio of the circuit decreases according to the load current and the diode junction capacitor. In addition, it is necessary for these rectifiers to use some power factor correctors. This paper investigates the circuit with SiC diodes and an added inductor. The proposed circuit is focused on LC resonance between the added inductor and the diode junction capacitors. It is experimentally clarified that the LC resonance improves the boost ratio, the power factor, and the efficiency in the proposed circuit.

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