POWER CONVERSION SYSTEM AND MOTOR CONTROL METHOD BY THE SAME

• Main Authors: ISHIGAKI TAKUYA, TAKADA HIDETO, SUGIURA MASAKI, MATSUMOTO YUTAKA, UEI YUSUKE
• Format: Patent
• Language: English; Japanese
• Published: 02.08.2021
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROL OR REGULATION THEREOF; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

To provide a power conversion system capable of temporarily improving the characteristics of a motor.SOLUTION: A power conversion system 200 comprises a power supply device 11 and a power conversion device 2 for supplying power to a motor 3. The power conversion device includes an inverse converter 7 for converting electric power, a control circuit 8, and a current detector. The power supply device includes an accumulation device 6 for accumulating power according to voltage, a step-up/step-down power supply circuit 5 for changing voltage of the accumulation device based on a voltage command, and a voltage command calculation circuit 15 for calculating energy to be stored in the accumulation device and outputting it as a voltage command to the step-up/step-down power supply circuit. The control circuit calculates power running energy of the motor using information from the motor and a current value detected by the current detector. The voltage command calculation circuit calculates energy to be stored in the accumulation device based on the power running energy calculated by the control circuit. When the characteristics of the motor are suppressed, the voltage command calculation circuit temporarily changes the voltage command.SELECTED DRAWING: Figure 10 【課題】モータの特性を一時的に改善することが可能な電力変換システムを提供する。【解決手段】電力変換システム２００は、モータ３に電力を供給する電力変換装置２と、電源装置１１とを備えている。電力変換装置は、電力を変換する逆変換器７と、制御回路８と、電流検出器とを備えている。電源装置は、電圧に応じて電力を蓄積する蓄積装置６と、電圧指令に基づいて蓄積装置の電圧を変更する昇降圧電源回路５と、蓄積装置に蓄積するエネルギーを演算して電圧指令として昇降圧電源回路へ出力する電圧指令演算回路１５とを備えている。制御回路は、モータからの情報と電流検出器で検出した電流値とを用いて、モータの力行エネルギーを算出し、電圧指令演算回路は、制御回路で算出された力行エネルギーに基づいて蓄積装置に蓄積するエネルギーを演算し、モータの特性が抑制されているときに、電圧指令演算回路は、電圧指令を一時的に変更する。【選択図】図１０