Megawatt-level wind generating set paddle changing system battery automatic testing method and system

Abstract

The invention relates to a megawatt-level wind generating set paddle changing system battery automatic testing method and system. The method comprises the following steps of: carrying out battery testing when a wind generating set is in 80 degrees -50 degrees paddle opening period under a starting mode; during the battery power supply period of the wind generating set under a grid-connected mode, controlling a paddle changing system through a master control system to be changed from 0 degree to 5 degrees in a feathering mode, and opening a paddle from 5 degrees to 0 degree; and if a battery has a fault, using a main power supply to carry out feathering. The system comprises a contactor 1 K1 which controls the main power supply to supply power to a servo driver, a contactor 1 K2 which controls a battery to supply power, and a power supply switch bit (PSSB) which can control the contactors 1 K1 and1 K2, wherein normally closed contacts of the contactors 1 K1 and 1K2 are respectively connected in series with the opposite control loops so as to form interlocking. The method and the system provided by the invention utilize a mode that blades drive the loading battery to discharge in the grid-connected operation process of the wind generating set, the paddle changing system battery can be tested at regular time, and potential safety hazard caused by negligence can be avoided.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to an automatic battery test method and system for a pitch system of a megawatt wind power generating set. Background technique [0002] The pitch system of megawatt-level wind turbines is generally equipped with three battery cabinets, each containing three sets of batteries, each with six batteries, which are valve-regulated lead-acid batteries. The rated voltage of a single battery is 12V, and the rated voltage of each group is 72V. The three groups of batteries in the cabinet are connected through short-circuit terminals, and the rated voltage of each cabinet is 216V. The pitch system battery is a very important component of the wind turbine. It is the backup power supply of the entire system. When the safety chain of the wind turbine is disconnected or the power grid is cut off, the battery is used to realize the emergency feathering function. The battery drives t...

AI Technical Summary

Problems solved by technology

[0003] In addition to being affected by its own characteristics, the performance of lead-acid batteries will also be affected by various factors such as the ambient temperature used. The above reasons may lead to performance degradation or even failure of lead-acid batteries, thus affecting the safety and reliability of the entire unit. severe impact

[0004] Due to the characteristics of the lead-acid battery itself, the actual condition of the battery cannot be fully reflected by testing the voltage of the lead-acid battery, and the existing pitch system uses this method to monitor the battery capacity, which has its own shortcomings

The way to test the internal resistance of lead-acid batteries is relatively accurate, but it needs to use a special internal resistance tester to regularly test the single battery one by one, which is time-consuming and laborious, and it is impossible to monitor the status of the battery in real time

[0005] The above-mentioned method for measuring the battery capacitance obviously has inconvenience and defects, and needs to be further improved urgently.

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