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Outline
The grid-forming cascaded H-bridge energy storage system is an optimal solution for mitigating large-scale renewable energy power fluctuations and providing grid support. However, the power control of the system is coupled with line impedance, and the coupling effect intensifies under weak grid, leading to output power inaccuracy and increasing risk of instability. To solve this problem, an adaptive power decoupling control strategy based on reactive voltage compensation is proposed. First, based on the small-signal model of a virtual synchronous generator and through the introduction of power coupling coefficients which take into account closed-loop feedback, a quantitative analysis is conducted on the power coupling effects between line impedance angle and power angle, revealing the mechanism of effect of active power on reactive power control. Second, an adaptive reactive power compensation channel is constructed, and a proportional-integral voltage compensation link in the reactive power control is designed, which dynamically modifies the output voltage references to mitigate the power coupling without the identification of line parameters. As a result, dynamic decoupling control is realized in a wide range of impedance angle with strong adaptability. Finally, validation tests based on a simulation platform and an RT-LAB platform verified the proposed method.
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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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