DC pre-excitation for three level variable-frequency speed-governing system start process |
Title： |
| DC pre-excitation for three level variable-frequency speed-governing system start process |
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Application Number： |
200510086610 |
Application Date： |
2005/10/14 |
Announcement Date： |
2006/05/03 |
Pub. Date： |
2007/11/07 |
Publication Number： |
1767367 |
Announcement Number： |
100347949 |
Grant Date： |
2007-11-7 |
Granted Pub. Date： |
2007-11-7 |
ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
H02P 21/08, H02P 1/16 |
Applicant(s)： |
Tsinghua University |
Inventor(s)： |
Bai Hua, Zhao Zhengming, Yuan Liqiang, Zhang Haitao, Zhang Yan''an |
Key Words： |
DC pre-excitation, three level, variable-frequency, speed-governing system, start process |
Abstract： |
The invention relates to a dc pre-excite magnet method which adds the motivating torque of the variable-frequency control system and reduces the motivating current to improve the motivating function of the variable-frequency device-motor system in the field of power electron technology. It first ascertains the pre-excite magnet scheme to choose the excite magnet voltage vector direction and the motivating voltage vector direction by park equation; it chooses the excite magnet voltage vector direction PPP and PNP vector for the three levels middle level principle and space vector PWM pulse generating rule; it ascertains the object current and decides the time, size of the vector by the motor inner parameter; it generates the voltage vector pulse sequence by the object current and computes the best excite magnet angle and excite magnet current combined to the three levels variable-frequency device self character. |
Claim： |
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Priority： |
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PCT： |
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LegalStatus： |
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