ESTABLISHMENT OF A SWITCHED RELUCTANCE GENERATOR AND ITS CLOSED-LOOP CONTROL STUDY
| Autor: | Chun-Yu Hou, 侯俊宇 |
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| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 93 The major purposes of this thesis are the establishment of a DSP-based switched-reluctance generator (SRG) and to perform its closed-loop control. First, the electromechanical energy conversion principle and the governing equations of a SRG are described. Then some practical issues in operation and control of SRG are studied. These issues include excitation control and voltage build up characteristics, winding current PWM switching control properties, the effects of commutation instant shift on the winding current control and generator operation, the possible closed-loop control configurations and strategies, etc. The instability of winding current control caused by negative back electromotive force (EMF) is analyzed. Then accordingly, the current control PWM scheme based on two switching modes is proposed to yield more stable winding current control. For performing performance test, a DSP-based SRG system is established, and some measured results are provided to demonstrate its normal operation. In voltage control aspect, a nominal dynamic model of the established SRG system is first estimated form measurements. Then a feedback controller and a linear model following controller (LMFC) are designed to let the SRG system possess prescribed voltage control performance under varying system parameters and operating conditions. In order to reduce DC-bus voltage ripples, a simple robust voltage ripple cancellation (RVRC) control scheme is proposed. Finally, from the experimental observations it is found that the conversion efficiency, the winding current tracking trajectory and hence the voltage dynamic responses are much influenced by the commutation instant shift. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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