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Outline
The recovery overvoltage after the fault ride through of direct-driven wind power permanent magnetic synchronous generators (D-PMSGs) caused by control delay and delayed fault clearing identification may lead to cascading disconnection of generators, which has become a key factor limiting the renewable energy accommodation. Aimed at this problem, the generation mechanism of post-fault terminal overvoltage was quantitatively analyzed, and an analytical expression for the relationship among the terminal voltage, grid parameters and output active/reactive current was derived. A reactive current instruction analytical generation and compensation control method during the fault ride recovery process was proposed, and the logic of strategy start/exit was given. The strategy adaptively adjusts the reactive current reference value of generators according to the grid parameters and measured active current, so as to eliminate the impact of part of the control delay links. The simulation results of a case study show that the proposed control strategy can effectively suppress the overvoltage and mitigate the potential risk of system destabilization after fault clearing, thus improving the safety and stability of the renewable energy grid-connected system.
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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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