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When the Vienna rectifier is connected to unbalanced loads operating under light load conditions，the slight power difference causes unbalanced voltage of bipolar DC bus，which increases the voltage stress on the switching device and DC-link capacitance. To solve the above problems，a DC offset reduction of neutral point voltage strategy based on reactive current compensation for Vienna rectifier with bipolar DC-link was proposed. By combining the amplitude of zero-sequence component，which is superimposed onto the three-phase reference voltage，the neutral point current for various power conditions can be obtained. The effect of the phase angle difference between the reference voltage and the input current on the neutral point current was analyzed，and the maximum reactive currents of the odd and even sectors was obtained according to the operating region of the Vienna rectifier. In order to increase the neutral point current under light load condition，the reactive current was injected to change the phase angle difference according to the contour of neutral point current，thereby achieving the balance of bipolar DC bus under light load conditions. Finally，the effectiveness of the proposed strategy was verified on the Vienna rectifier experimental platform.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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