Three phase induction motor servo drive system with current and space vector control
| Autor: | Pong ,King-Long, 彭金龍 |
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| Rok vydání: | 1996 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 84 In the past, the induction motor was difficult to control due to its highly nonlinear and high-order dynamic. Recently, the technologies of microprocessors, power electronics and control theories have been rapidly developed. Using the advanced technologies, an induction motor can be controlled like a separately excited dc motor. The most popular way to control the induction motor is the indirect field-oriented control using voltage source inverter (VSI); and the control of VSI are implemented by the current control or the space vector control. In this thesis, the current control methods (hysteresis, predict and ramp comparison PWM), and the space vector control methods (average voltage and current control space vector) of the VSI will be discussed and implemented. Current control have the following merits: (1) simple control circuit; (2) combining the advantage of VSI and current source inverter (CSI); (3) high switching frequency; (4) small peak values of voltage and current during switching. On the other hand, the ramp comparison current co ntrolled PWM method needs addition analog control circuit, which results increasing of circuit cost and reducing the flexibility of the system. The space vector methods have the merits of short switching interval, reducing harmonic component and the carrier modulation is not need. So most fully digitized induction motor drive systems are implemented with space vector control. In this thesis, the theoretic principles of the current control and space vector control methods are described first. Next, the simul ation using Matlab are carrier out. Then the current and space vector control methods are implemented by a computed-based induction motor drive. The hardware circuits of the motor drive are mainly composed of three parts, one is the power circuit, another is the lockout and driving circuit, and the other is the ramp comparison |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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