Full
Outline
The capacitor voltage full feedback scheme employed in LCL-type grid-connected inverters can suppress grid background harmonics. However, the existing schemes exhibit insufficient suppression capability for high-order harmonics. To address this problem, this paper proposes an improved harmonic suppression strategy. By introducing a compensation link into both the unit feedback path and the second-derivative feedback path, the phase deviation caused by neglecting the control delay is compensated. The improved capacitor voltage full feedback method more closely approximates the ideal effect, particularly in the high-frequency band. Furthermore, by introducing a weighting coefficient into the compensation link of the second -derivative feedback path, the equivalent resistance induced by the capacitor voltage full feedback is reshaped, thereby ensuring stable system operation. Experimental results demonstrate that the grid -connected inverter utilizing the proposed improved harmonic suppression method can effectively suppress the grid current distortion caused by background harmonics in the grid voltage, showing particularly effective suppression for harmonics in the medium and high-frequency bands.
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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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