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Authors have proposed the speed sensorless vector control method that can stabilize the speed estimator in regeneration region as well as in powering operation. However, actual experimental results showed there were problems when it is driven at unloaded or around zero frequency with heavy load. In this paper observer gains are reviewed and modified with considering the phase condition which they...
A high-performance control method for a voltage-type pulsewidth-modulated voltage-type converter is introduced. Starting from the modeling of the converter, power-factor control and five types of DC voltage control are discussed. The stability and responses of these control methods are analyzed and compared with the root locus method and by digital simulation. The most promising approach, which uses...
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