A Medium-Voltage Motor Drive with a Modular Multilevel PWM Inverter Part II. Startup Method and Performance

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  • Nishimura Kazutoshi
    Dept. of Electrical and Electronic Engineering, Tokyo Institute of Technology
  • Hagiwara Makoto
    Dept. of Electrical and Electronic Engineering, Tokyo Institute of Technology
  • Akagi Hirofumi
    Dept. of Electrical and Electronic Engineering, Tokyo Institute of Technology

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Other Title
  • モジュラー・マルチレベルＰＷＭインバータを用いた高圧モータドライブ第２報：始動法と始動特性
  • モジュラー マルチレベル PWM インバータ オ モチイタ コウアツ モータドライブ ダイ2ホウ シドウホウ ト シドウ トクセイ

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Abstract

This paper presents a medium-voltage motor drive with a modular multilevel PWM inverter, and focuses on a startup method and its performance. It is formed by six modular arms, each of which consists of a cascaded stack of multiple bidirectional chopper-cells. The frequency of the dominant ac-voltage fluctuation is equal to the motor (inverter) frequency. These fluctuations occur in the dc capacitor of each chopper-cell, and the magnitude of the fluctuation is inversely proportional to the motor frequency. Because of the increased voltage fluctuation in low-frequency regions, the so-called “volt-per-hertz control” cannot be applied in motor starting. The startup method proposed in this paper is suitable for a motor drive with the modular multilevel PWM inverter. It enables the motor to produce a startup torque loaded on the motor at an initial amplitude and a fixed frequency of the inverter while taking into account constraints on the motor current and the ac-voltage fluctuation. The validity of the startup method as well as the startup performance is confirmed by experiment and simulation.

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