PROBLEM TO BE SOLVED: To solve the problem that, in a system where multiple induction motors are driven by one inverter controller under speed sensorless vector control, states of phase interruption or erroneous wiring of the motors cannot be accurately detected.SOLUTION: A power conversion device comprises: a current vector detection part for generating a torque current detection value and an excitation current detection value from current detection values between the power conversion device and multiple induction motors; a shear frequency calculation part for generating a shear frequency based on a torque current command value and an excitation current command value; a speed estimation part for generating an estimated speed of the induction motors based on a deviation between the torque current detection value and the torque current command value; a connection defect discrimination device for detecting a connection defect of the multiple induction motors based on the excitation current detection value; and a voltage vector calculation part for generating a voltage command value based on an inverter frequency that is generated based on the shear frequency and the estimated speed in such a manner that the torque current detection value follows the torque current command value, the torque current command value and the excitation current command value.SELECTED DRAWING: Figure 1
【課題】速度センサレスベクトル制御された1台のインバータ制御装置により複数の誘導モータを駆動するシステムでは、モータの欠相や誤配線の状態を精度良く検出することができない。【解決手段】電力変換装置と複数の誘導モータの間の電流検出値からトルク電流検出値と励磁電流検出値を生成する電流ベクトル検出部と、トルク電流指令値と励磁電流指令値に基づきすべり周波数を生成するすべり周波数演算部と、前記トルク電流検出値と前記トルク電流指令値の偏差に基づいて前記誘導モータの推定速度を生成する速度推定部と、前記励磁電流検出値に基づいて前記複数の誘導モータの接続不良を検知する接続不良判断装置と、前記トルク電流検出値がトルク電流指令値に追従するように前記すべり周波数と前記推定速度に基づき生成されたインバータ周波数と、前記トルク電流指令値と、前記励磁電流指令値と、に基づいて電圧指令値を生成する電圧ベクトル演算部と、を備える。【選択図】 図1
POWER CONVERSION DEVICE
電力変換装置
2017-08-03
Patent
Elektronische Ressource
Japanisch
IPC: | H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES |
Power conversion device, power conversion system, and power conversion method
Europäisches Patentamt | 2018
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