A kind of doubly-fed wind turbine generator control method and generator
A technology of a doubly-fed wind turbine and a control method, which is applied in the direction of controlling generators, control systems, electrical components, etc., can solve the problems of the converter losing the control ability of the generator, the normal operating speed range is narrow, and the operating efficiency cannot be operated, etc. Achieve the effect of increasing the normal operating speed range, increasing the power generation, and having a simple structure
Active Publication Date: 2018-05-01
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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Problems solved by technology
[0002] At present, the key technical indicators of wind turbines are power generation performance and reliability, and power generation performance, as the most concerned indicator of wind turbine operators, directly affects the market prospect of wind turbines; Due to the limitation of its normal operating speed range, it cannot operate or its operating efficiency is very low in the low wind speed section; for the doubly-fed asynchronous generator with the existing stator winding structure, it is directly connected to the grid through the stator contactor. In the operating speed range, the connection type of the stator winding remains unchanged (D connection type or Y connection type). Therefore, when the generator speed is low, due to the large slip, the generator rotor voltage exceeds the converter current. The ability of the maximum output voltage of the converter causes the converter to lose control of the generator, causing the wind turbine protection shutdown
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0022] Such as figure 1 As shown, the control method of the doubly-fed wind turbine generator in this embodiment includes the following steps:
[0023] S01. In the normal power generation state of the double-fed wind turbine generator, detect the running speed of the generator in real time;
[0024] S02. When the rotating speed of the generator is lower than the preset minimum generating rotating speed, the three-phase winding of the stator of the generator is switched from the delta connection in normal operation to the star connection to continue generating electricity.
[0025] In the generator control method of the doubly-fed wind turbine of the present invention, when the rotational speed of the generator is in the low-speed range, the stator three-phase winding of the generator is switched from the delta connection to the star connection...
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The invention discloses a control method for a doubly-fed wind turbine generator, which detects the operating speed of the generator in real time when the doubly-fed wind power generator is in the normal power generation state; when the generator speed is lower than the preset minimum power generation speed , the stator three-phase winding of the generator switches from the delta connection during normal operation to the star connection to continue generating electricity. The invention also discloses a doubly-fed wind turbine generator, the stator three-phase winding is connected to the public power grid, the rotor three-phase winding is connected to the output end of the converter, and the stator three-phase winding is provided with a The switch for switching the connection mode between star and delta. The switch switches the connection mode of the stator three-phase winding from the delta connection in normal operation to star connection. Both the control method and the generator of the present invention have the advantages of being able to increase the generating capacity of the generator at a low speed section.
Description
technical field [0001] The invention mainly relates to the technical field of wind power generation, in particular to a generator control method and generator of a doubly-fed wind turbine. Background technique [0002] At present, the key technical indicators of wind turbines are power generation performance and reliability, and power generation performance, as the most concerned indicator of wind turbine operators, directly affects the market prospect of wind turbines; Due to the limitation of its normal operating speed range, it cannot operate or its operating efficiency is very low in the low wind speed section; for the doubly-fed asynchronous generator with the existing stator winding structure, it is directly connected to the grid through the stator contactor. In the operating speed range, the connection type of the stator winding remains unchanged (D connection type or Y connection type). Therefore, when the generator speed is low, due to the large slip, the generator ...
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IPC IPC(8): H02P9/04H02J3/38H02P101/15
Inventor 唐建平王宝归陈世超臧晓笛王靛王立鹏阮向艳袁莹李音泉郭凯平
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST