Title :
Line current harmonics of VSI-fed adjustable-speed drives
Author :
Grötzbach, Manfred ; Redmann, Reiner
Author_Institution :
Dept. of Electr. Eng., Univ. of Federal Defence Munich, Neubiberg, Germany
Abstract :
Voltage-source-inverter (VSI)-fed adjustable-speed drives are frequently used in energy-saving applications like speed regulation of pumps and fans. The power supply of the inverter consists of a diode rectifier feeding a large DC-link capacitor. Thus, very high line current harmonics occur if no inductance is provided for current smoothing. Assuming AC choke inductance, this paper presents diagrams in order to predetermine easily the harmonic distortions of the line current. The parameters considered are AC reactance, DC capacitor, and the actual drive loading. With this, a more detailed description of the injected current harmonics of VSI-fed drives is achieved in order to improve the accuracy of harmonic analysis purposes. Examples show the use of the proposed method and comparing measurements proves the validity in practical applications
Keywords :
AC-DC power convertors; DC-AC power convertors; harmonic analysis; harmonic distortion; invertors; machine theory; power capacitors; power conversion harmonics; rectifying circuits; variable speed drives; DC link capacitor; VSI-fed adjustable-speed drives; diode rectifier; energy saving applications; harmonic analysis; injected current harmonics; line current harmonics; power supply; voltage source inverter; Capacitors; Diodes; Fans; Inductance; Inverters; Power supplies; Rectifiers; Smoothing methods; Variable speed drives; Voltage;
Journal_Title :
Industry Applications, IEEE Transactions on
