Three-level voltage source inversion circuit for frequency-converting speed regulator of 6 KV asynchronous motor
Title：
Three-level voltage source inversion circuit for frequency-converting speed regulator of 6 KV asynchronous motor
Application Number：
 02121113
Application Date：
 2002/06/07
Announcement Date：
 2002/12/11
Pub. Date：
Publication Number：
 1384598
Announcement Number：
 1207843
Grant Date：
 2005-6-22
Granted Pub. Date：
 2005-6-22
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 H02P 7/63, H02M 7/521
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Liu Wenhua, Wu Buning, Song Qiang
Key Words：
 Three-level voltage source,inversion circuit,frequency-converting speed regulator,6 KV asynchronous
Abstract：
 The present invention belongs to a frequency converting speed regualtor for great capacity and high voltage asynchronous motor. It contains input rectifier and filter circuit with high voltage electronic switch and input common-mode voltage suppressing circuit; IGCT serial three-level voltage source in verter circuit with input inverting switching device to turn on the current ascending speed suppression and to turn off overvoltage clamping circuiot; and three-phase IC filter circuit. In the input rectifier and filter circuit, the output voltage in the secondary windings of the input isoalting transformer has phase shift of 0, 15, 30 and 45 deg separately relatively to the reference voltage. The secondary windings have special turn number ratio. It has primary voltage of 6 KV, input power factor of 0.95, input current distortion less than 5%, immediate 130% overload protection, and frequency converting speed regulating efficiency over 96%.
Claim：
Priority：
PCT：
LegalStatus：

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2008-4-17
  Selected patents owned by Tsinghua University filed in 2005 are loaded.
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