Double fed asynchronous wind power generator rotor side parallel-in control method
A technology of wind generator and control method, which is applied to wind power generation, parallel feeding arrangement of a single network, etc., can solve the problems of long time for generators to be disconnected and reconnected to the grid, unable to meet the requirements of power system stability, etc. Increase system cost and achieve simple effect
Inactive Publication Date: 2009-08-19
北京清能华福风电技术有限公司
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Problems solved by technology
However, this kind of variable-speed constant-frequency double-fed asynchronous wind turbine also suffers from the transient voltage drop of the above-mentioned generator due to a fault, and the generator cannot meet the stability requirements of the power system due to the long time for the generator to be disconnected from the grid and then connected to the grid.
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[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0015] As mentioned above, for the existing doubly-fed asynchronous wind turbines, when the generator has an instantaneous voltage drop due to a fault, the control strategy usually adopted is to directly cut off the wind turbine from the grid, and then re-connect to the grid after the system returns to normal . However, this fault control method of switching generators in and out will affect the stability of the local power grid. And, as the share of wind turbines in the grid has increased in recent years, this impact has also intensified.
[0016] In addition, currently generally used switches for controlling the connection or disconnection between the wind power generator and the power grid are mainly mechanical switches such as contactors and circuit breakers. However, such a mechanical switch often takes a long time to switch between connected and...
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Then invention provides a grid-connecting control method of the rotor-side of a wind turbine generator. The stator-side of the generator is always connected with a grid during the whole process; the stator-side of the generator only adopts a locked soft breaking method to a converter on the rotor-side so as to protect a converter on the generator rotor-side. The control method not only protects the converter of the generator rotor-side but also guarantees the continuous connection of the generator with the grid without any impact on the grid stability. Besides, as the switch between rotor-side converter and the generator rotor is realized through the soft breaking, the defect of the traditional doubly fed generator that the time from grid-cutting off to gird reconnecting is relatively long can be overcome and the requirements of continuous operation of the wind turbine generator of the electric system can be satisfied.
Description
technical field [0001] The invention relates to a control method for doubly-fed asynchronous wind power generator rotor side grid connection, in particular to a method for realizing the control method that the generator can run without being disconnected from the grid when the generator fails by softly disconnecting the rotor side of the generator and then reconnecting it. It belongs to the technical field of wind power generation. Background technique [0002] As a new form of power generation, wind power is connected to the grid on a large scale, which has changed the stable operation characteristics of the traditional power system dominated by synchronous generators. With the vigorous development of wind power generation, the total installed capacity of wind power is increasing rapidly, and the capacity of single units is increasing continuously. In the region, wind power generation has already occupied an important position in the local power system and has become an im...
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CPCY02E10/763Y02E10/76
Inventor 苑国锋郑艳文龚细秀
Owner 北京清能华福风电技术有限公司