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Fast Voltage Stabilization Control of Split DC Bus Midpoint in 3P4W Shunt APFs
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| Author(s) |
Xinwei XU |
| Abstract |
A midpoint voltage balancer (MVB) based on dual-switching-leg is proposed in this paper. The MVB provides fast voltage stabilization of the midpoint in three-phase four-wire (3P4W) shunt active power filters (APFs). Interleaved control is adopted in the MVB to prevent high-frequency current circulation in split capacitors, and to facilitate an accurate neutral current tracking. All switches of the MVB operate in zero-voltage switching (ZVS) mode when the neutral current is smaller than the nominal phase current of the APF. MATLAB simulation is carried out to verify the effectiveness of the MVB. A 20 kVA prototype has been built, and experimental results show that the voltage ripple of the midpoint is maintained within 1.5\% of the total dc bus voltage even under severe neutral current transient. |
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| Filename: | 0129-epe2019-full-10303057.pdf |
| Filesize: | 1.014 MB |
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| Type |
Members Only |
| Date |
Last modified 2020-08-14 by System |
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