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On-line capacitance estimation of DC-link capacitor by input current injection for PWM conveters
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| Author(s) |
D.-C. Lee; K.-J. Lee; J.-K. Seok; J.-W. Choi |
| Abstract |
In this paper, a novel on-line capacitance estimation of dc link capacitor using input current
injection is proposed for the ac/dc PWM converters. At no load, a controlled input current at a lower
frequency than the line frequency is injected into the input side, which causes the dc voltage ripples at
the output side. With the ac voltage and current ripple components on the dc side extracted by the digital
filters, the capacitance can be calculated simply through a voltage-current relationship. This method can
be implemented only by software without any additional hardware. It is shown that the estimation error
is less than 1.5% from the experimental result. |
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| Filename: | EPE2003-PP0851 - Lee |
| Filesize: | 220.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2003-10-24 by Unknown |
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