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Capacity detection method and device of supercapacitor

A technology of supercapacitor and detection method, which is applied in the direction of capacitance measurement, measuring device, and measurement of electrical variables, etc., and can solve the problems that the capacitance value of supercapacitor cannot be detected online

Active Publication Date: 2019-01-15
BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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Problems solved by technology

[0004] However, since the operation of cutting off the output of the charger usually needs to be performed after the wind turbine is shut down, the capacitance of the supercapacitor can only be detected offline, but cannot be detected online

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  • Capacity detection method and device of supercapacitor
  • Capacity detection method and device of supercapacitor
  • Capacity detection method and device of supercapacitor

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Embodiment Construction

[0035] Features and exemplary embodiments of various aspects of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.

[0036] The pitch system of the wind turbine is used to adjust the pitch angle of the blades. For example, if the wind speed exceeds the rated wind speed during normal operation of the wind turbine, the pitch control system will perform the pitch adjustment operation to keep the speed of the wind turbine constant so that the wind turbine can output constant power; if the wind turbine fails, The pitch control system will perform a feathering operation, adjust the pitch angle of the blades from the current value to 0°, and ensure the safety of the wind turbine through aerodynamic braking.

[0037] The pitch system is powered by the power grid. When the power grid fails or low voltage rides through, the pitch system can...

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Abstract

The invention discloses a capacity detection method and device of a supercapacitor. The capacity detection method comprises the steps of detecting whether a wind power generator set is started again or not after power failure; detecting whether both of a voltage of the supercapacitor and a working state of a charger conform to a preset capacity detection condition of the supercapacitor or not if the wind power generator is started again after power failure; and performing calculation to obtain capacity of the supercapacitor according to a current of the charger and the voltage of the supercapacitor if both of the voltage of the supercapacitor and the working state of the charger conform to the capacity detection condition of the supercapacitor.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method and a device for detecting the capacitance of a supercapacitor. Background technique [0002] Supercapacitors are an important part of the pitch system of wind turbines. When the wind turbine fails, the pitch control system will perform an emergency propeller retraction function to realize pneumatic braking and ensure the safety of the unit. When the power grid is normally powered, the pitch control system relies on the grid to perform the pitch reduction operation. When the power grid fails, the pitch control system needs to use the super capacitor (that is, the backup power supply) to perform the pitch reduction operation. Since the capacitance value of the supercapacitor will gradually decrease or even fail during use, which will affect the safe operation of the wind turbine, it is necessary to detect the capacitance value of the supercapacitor in the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/2605
Inventor 马磊许东宁卢勇
Owner BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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