2006 Fiscal Year Final Research Report Summary
Improvement of Performance of PWM Inverter with Voltage Booster with Regenerating Capability Augmented by Double-Layer Capacitor
| Project/Area Number |
17560261
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | Kagoshima University |
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Principal Investigator |
YAMAMOTO Kichiro Kagoshima University, Faculty of Engineering, Research Associate, 工学部, 助手 (70220457)
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| Co-Investigator(Kenkyū-buntansha) |
SHINOHARA Katsuji Kagoshima University, Faculty of Engineering, Professor, 工学部, 教授 (80112358)
IIMORI Kenichi Kagoshima University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (00284901)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Double-layer capacitor / Electric vehicle / Hybrid vehicle / Permanent-magnet motor / PWM inverter / Bi-directional chopper |
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| Research Abstract |
Performance of PWM inverter with voltage boosters which had regenerating capability augmented by double-layer capacitor was improved.
In previous research, we proposed PWM inverter with voltage booster which had regenerating capability augmented by double-layer capacitor. In this circuit, the capacitor was connected to battery in parallel. So, the circuit needed a large number of capacitor cells. As the result, the topology increased cost, volume and weight of the system.
In this research, we proposed two circuit topologies (circuit topology 1 and circuit topology 2) to reduce the number of capacitor cells. The capacitor was connected to the battery in series in these topologies.
For the topology 1, a step-up converter for both of battery and double-layer capacitor and a step-down converter for only double-layer capacitor were used. All regenerative power was absorbed by the double-layer capacitor. However, this topology was not able to control the terminal voltage of the double-layer capacitor.
To solve the problem, the topology 2 used two bidirectional voltage boosters to control the power from or to the double-layer capacitor. One of the boosters was used for both of the battery and double-layer capacitor to control the dc link voltage of PWM inverter. The other was used for only the double-layer capacitor to control the current flowing from and to the double-layer capacitor. A strategy to control the power flow of the system and a strategy of battery current indirect control were proposed.
The relation between the currents of voltage boosters and the ratio of battery voltage to voltage of double-layer capacitors was also discussed. These results are useful to design the system for topology 2. Finally, the results from proposed and previous topologies were compared and it was shown that the topology 2 had most advantageous in terms of the number of capacitors and control capability.
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