POWER CONVERSION DEVICE

• Main Authors: TOBARI KAZUAKI, WATANABE HIROSHI, HAYASHI KOSUKE, SUGIMOTO TAKUYA, KONUMA YUSAKU
• Format: Patent
• Language: English; Japanese
• Published: 13.06.2023
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

To provide a power conversion device capable of preventing an oscillatory phenomenon and achieving speed control without speed deviations even when there is an error in a secondary resistance value.SOLUTION: A power conversion device includes: a power converter that outputs, to an induction motor, a signal that makes an output frequency, an output voltage and an output current of the induction motor variable; and a control unit that controls the power converter. The control unit calculates a voltage and a current in a control shaft from the output current, with a direction of a primary current and a direction orthogonal thereto assumed to be a rotational coordinate system, calculates a first speed estimation value and a second speed estimation value from the voltage and the current, performs calculation for speed control from the first speed estimation value, and calculates a primary frequency command value from the second speed estimation value.SELECTED DRAWING: Figure 1 【課題】二次抵抗値に誤差がある場合でも、振動現象を防止し、速度偏差が無い速度制御を実現できる電力変換装置を提供する。【解決手段】誘導モータの出力周波数、出力電圧及び出力電流を可変にする信号を前記誘導モータに出力する電力変換器と、電力変換器を制御する制御部とを有し、制御部は、出力電流から、一次電流の方向とそれに直交する方向を回転座標系とした制御軸における電圧、電流を演算し、電圧および電流から、第１の速度推定値と第２の速度推定値を演算し、第１の速度推定値から速度制御の演算をし、第２の速度推定値から一次周波数指令値を演算する電力変換装置。【選択図】図１