電気学会論文誌D(産業応用部門誌)
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
140 巻 , 3 号
選択された号の論文の26件中1~26を表示しています
特集:半導体電力変換研究会
特集論文
論文
  • 岩蕗 寛康, 民田 太一郎, 岩田 明彦
    2020 年 140 巻 3 号 p. 194-201
    発行日: 2020/03/01
    公開日: 2020/03/01
    ジャーナル 認証あり

    We examined the application of the pulse density modulation (PDM) method to a high-frequency voltage-source inverter for dielectric barrier discharge (DBD). The inverter consists of a full-bridge inverter, step-up transformer, and resonant circuit, and the high-frequency output is supplied to a pair of dielectric electrodes. It is characterized by applying the PDM method to inverter control, and burst controlling the inverter. In this paper, we first describe the specifications and circuit configuration required for a high-frequency voltage-source inverter. Next, we describe the concept of burst frequency setting as a new parameter and the method of constructing a pulse-generating circuit. Finally, a discharge test by prototype inverter is carried out, and it is demonstrate that discharge is stabilized by using PDM.

  • 新中 新二
    2020 年 140 巻 3 号 p. 202-210
    発行日: 2020/03/01
    公開日: 2020/03/01
    ジャーナル 認証あり

    Firstly, this paper reconstructs a dynamic mathematical model of synchronous reluctance motors (SynRMs) with magnetic dq-cross coupling. This model consists of three self-consistent basic equations of circuit, torque evolution, and energy transmission equations. Secondly, based on the model, this paper reveals analytically that for the SynRMs, there always exists a reference frame called “magnetic salient-pole reference frame” where no magnetic axis-cross coupling occurs, and that the mathematical model in the frame turns out to be formally identical to the ideal one without dq-cross coupling in the dq-synchronous reference frame. Thirdly, this paper proposes new design and realization methods for a current controller, command converter for efficient drive, and salient-pole phase estimator for the SynRMs. The proposed methods perform all the necessary operations in the magnetic salient-pole reference frame instead of the dq synchronous reference frame, and they could achieve high performance and simplicity. The effectiveness and usefulness of the proposed methods are verified through extensive numerical experiments.

  • 中村 直人, 新中 新二
    2020 年 140 巻 3 号 p. 211-219
    発行日: 2020/03/01
    公開日: 2020/03/01
    ジャーナル 認証あり

    A vector control method is necessary for high-efficiency and/or wide-range operations of induction motors. The method requires the phase of the rotor flux, which can be estimated by using the stator and rotor resistances. However, the error between the actual and estimated resistances causes rotor flux estimation error and consequently deteriorates the performance of the vector control. Generally speaking, the influence of the stator resistance error decreases as the speed increases, but not for the influence of the rotor resistance error, which is dependent on the speed. One of the approaches to cope with this problem is to provide the vector control system with robustness against resistance variation. This paper proposes a new slip-frequency vector control method to achieve high robustness to rotor resistance variation; this method has a simple structure similar to simple as the conventional slip-frequency vector control method. The effectiveness and usefulness of the proposed method are verified through extensive experiments.

  • 車谷 大揮, 桂 誠一郎
    2020 年 140 巻 3 号 p. 220-229
    発行日: 2020/03/01
    公開日: 2020/03/01
    ジャーナル 認証あり

    The paper reports a sprout of 3-degree-of-freedom (DOF) control. The limitation of feedback control including 2-DOF control has been raised for a long time; however, a suitable control theory for overcoming those limitations has still not been formulated. An underlying reason is that the disturbance-suppression performance and noise sensitivity cannot be decoupled. Several researches have tried to tackle this problem using a hardware approach, as a noise level depends on a hardware configuration. It should be noted that the hardware design expands spatiotemporal resolution of a system. This approach helps in reducing noise, namely, it works as the 3rd-DOF for a control system. Therefore, an improvement in the hardware design could be a new angle for solving a mixed-sensitivity problem. This paper quantitatively presents the relation between noise-reduction performance and the spatiotemporal resolution, and provides a foothold for the 3-DOF control.

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