Wind driven generator and pitch control method and pitch control system thereof

Abstract

The invention discloses a pitch control method for a wind driven generator, which includes: 1) acquiring wind source parameters of a wind field for mounting the wind driven generator, counting the given wind speed within each set time interval and acquiring parameters of the wind driven generator; 2), determining the relation between wind speed and pitch angle during stable running of the wind driven generator according to the given wind speed and the parameters of the wind driven generator and building a wind speed-pitch angle database; 3), detecting current wind speed or wind speed at a future interval in real time; 4), checking the stable pitch angle corresponding to the current wind speed or the wind speed at the future interval in the wind speed-pitch angle database, outputting pitch control command, and regulating the current pitch angle to be the corresponding stable pitch angle. The pitch control method of the wind driven generator can speed up pitch control process, reduce load impact of wind speed to blades and improve stability in running of the wind driven generator. The invention further provides a pitch control system and the wind driven generator comprising the same.

Description

technical field [0001] The present invention relates to the technical field of wind power generation, in particular to a pitch control method and a pitch control system for wind power generators. In addition, the present invention also relates to a wind power generator comprising the above-mentioned pitch control system. Background technique [0002] Wind power generator is a power machine that converts wind energy into mechanical energy, also known as windmill; wind power generation is the process of converting the wind energy intercepted in the windward swept area of ​​the blades of the wind power generator into electrical energy. The goal of the control system of the wind turbine is to obtain the maximum power generation from the wind energy under the condition of ensuring the safe operation of the wind turbine. When the operating state of the wind turbine reaches the rated stage, it usually reduces the absorption of wind energy by controlling the pitch angle, and at the...

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Problems solved by technology

[0009] However, since the above-mentioned pitch control method performs pitch control through the process of obtaining the wind resource parameters of the wind field-the current speed of the hub-the pitch angle, the control process requires a certain amount of analysis and calculation time, and the wind speed and its aerodynamic Therefore, this pitch control method has a certain hysteresis relative to the wind speed, which causes the wind speed to cause a large load impact on the blades of the wind turbine, and causes the wind turbine to work less efficient

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