Backup power supply system for variable pitch system of large fan

Abstract

The invention relates to a backup power supply system for a variable pitch system of a large fan. The system adopts five-series and three-parallel super capacitor modules, each module is formed by connecting 36 single bodies in series, the backup power supply system is provided with a main control module, and a charging module, a fault early warning module and a capacitance test module which are respectively connected with the main control module, the charging module adopts a charger charging loop, charging is carried out in a fast-to-slow and finally constant-voltage mode, the fault early warning module carries out overvoltage detection on each single body, and the capacitance testing module is connected with a variable-pitch controller, a variable-pitch driver and a main power supply contactor and carries out capacitance failure judgment calculation on the capacity of a backup power supply. Compared with like systems in the prior art, the system of the invention has the advantages of improving the utilization rate of the fan, reducing the maintenance cost and time, improving the capacity monitoring capability of the back-up power supply of the variable pitch system, improving the safety of the wind turbine generator and the like.

Description

technical field [0001] The invention relates to the field of back-up power supply for fan pitch systems, in particular to a back-up power supply system for large-scale fan pitch systems. Background technique [0002] The pitch control system is one of the core control systems of the wind turbine as the actuator for the wind turbine pitch operation. On the one hand, it executes the control commands from the main controller, adjusts the blade angle, and completes the control of the impeller speed and power of the fan. On the other hand, in the event of an emergency, the pitch control system can perform a feathering action to close the blades to the feathered position to ensure the safety of the wind turbine, which is an important barrier for the safe operation of the wind turbine. Considering the importance of the pitch system to the safe operation of wind turbines, usually, the pitch system will be equipped with a backup power supply. When the grid power supply of the pitch ...

AI Technical Summary

Problems solved by technology

When the wind turbine is running normally, the backup power supply generally does not participate in the pitch operation, and it is difficult for the pitch system to monitor the backup power capacity

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