Full
Outline
The capacitor-current feedback active damping is widely applied to attenuate the LCL resonance. Due to the control delay, the virtual impedance equivalence of active damping may exhibit a negative-damping effect, challenging the system stability. To address this issue, the feedback function should be well selected and designed according to the LCL resonance frequency. On the basis, a general graphical evaluation method is proposed, which can intuitively identify the positive-damping frequency ranges of different feedback functions and thus provide guidance for selecting a reasonable active damping feedback function. Using the proposed method, a phase-lag compensator with strong robustness against the fluctuation of LCL resonant frequency is put forward. Experiments were carried out on a 6 kW single-phase LCL grid-connected inverter, and results verified the theoretical analysis.
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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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