三相電解コンデンサレスコンバータ/インバータの不平衡負荷補償法 [in Japanese] Unbalance Load Comensation for a Three Phase Electrolytic Capacitor-Less Converter/Inverter [in Japanese]
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Unbalance load compensation for an electrolytic capacitor-less converter/inverter of the flywheel long life uninterruptible power supply which rating of 3 phase, 200V and 5kW-1min is described. The compensation has following characteristics.<br>(1) Automatic output voltage balancer to cancel output voltage offset and output unbalance of 3 phase inverter.<br>(2) An input negative phase sequence current controller to compensate input current harmonic distortion at unbalanced loads.<br>(3) Automatic gain control on converter to improve input currents and transient states.<br>The UPS has excellence test results which are obtained such as total harmonic distortion THD of input current of 1.2% and 2.0% at 2.6kW single phase load and single rectifier load, respectively. Output voltage offset and unbalance are compensated by automatic output voltage balancer under 0.5s.
- IEEJ Transactions on Sensors and Micromachines
IEEJ Transactions on Sensors and Micromachines 118(11), 1260-1265, 1998-11
The Institute of Electrical Engineers of Japan