Stand-by power source detection method of wind power generation set variable pitch system

Abstract

The invention discloses a stand-by power source detection method of a wind power generation set variable pitch system. The method comprises steps that: a variable pitch system storage battery set is connected with a PLC (Programmable Logic Controller) in the variable pitch system, the PLC is connected with a host computer; performance parameters of the variable pitch system storage battery set are firstly detected by the host computer, whether the performance parameters of the storage battery set can satisfy use requirements are determined according to a storage battery voltage drop and capacity relation report form, and a single battery having a fault is identified according to a determination result and is changed. The stand-by power source detection method is advantaged in that performance of the storage batteries is determined before hoisting of a blower fan, so timely change is carried out to prevent the storage batteries from being changed soon after hoisting, and power generation capacity loss and manpower cost increase caused by shutdown because of change of the storage batteries are avoided.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a battery backup power detection method for a pitch control system of a wind power generating set. Background technique [0002] At present, variable speed and pitch has become the main control method of wind turbines. The pitch system can control the blade pitch angle of wind turbines to automatically adjust with the wind speed above the rated wind speed. On the one hand, it reduces the impact of wind force on the fan, and at the same time ensures the stability of the power output of the generator to obtain the maximum energy. [0003] However, in the case of strong wind or sudden power failure, the pitch system must rely on the power of the backup power to drive the motor to ensure the safety of the unit. Insufficient or damaged backup power will cause serious consequences. According to statistics, lead-acid batteries are mainly used as backup power for the pitch...

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Problems solved by technology

[0003] However, in the case of strong wind or sudden power failure, the pitch system must rely on the power of the backup power to drive the motor to ensure the safety of the unit. Insufficient or damaged backup power will cause serious consequences

According to statistics, lead-acid batteries are mainly used as backup power for the pitch system in the wind power industry, and the service life is generally about 2 years. The performance of the battery is generally judged by monitoring the battery voltage and regular inspection after the wind turbine is generating electricity. If the pitch system is stored for a long time before installation, there will be a phenomenon that the battery needs to be replaced soon after the unit is running, and the normal voltage of the battery after aging does not mean that its capacity is normal; whether the performance of the battery can be detected in a timely and effective manner has a great impact on the wind turbine generator set It is of great significance to the safe operation and economic benefits of

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