Method for testing blade-changing battery of megawatt wind generating set
A technology for wind turbine and battery testing, which is applied in the measurement of electrical variables, electricity, and measuring devices, etc., can solve problems such as safety and reliability impact, time-consuming and laborious, and performance degradation of lead-acid batteries, to ensure accuracy and save energy. The effect of human and material resources
Active Publication Date: 2014-05-14
GUODIAN UNITED POWER TECH
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Problems solved by technology
The above reasons may lead to a decline in the performance of the lead-acid battery, or even failure, which will have a serious impact on the safety and reliability of the entire unit
[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 more accurate, but it needs to use a special internal resistance tester to test the single battery one by one, which is time-consuming and laborious
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[0023] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0024] see figure 1 As shown, a method for testing the pitch battery of a megawatt-level wind power generating set in the present invention mainly includes switching the set from standby mode to maintenance mode under the premise of ensuring the safety of the set; manually controlling the three blades of the pitch system to open When the pitch reaches 0°, disconnect the safety chain of the unit, and the 3 blades of the pitch control system are powered by the pitch battery to feather to 91°, and the battery capacity is judged by comparing the emergency feathering speed and time of the pitch control system with the normal value Whether it is enough to avoid the situat...
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The invention discloses a method for testing a blade-changing battery of a megawatt wind generating set, and the method comprises the following steps of (1) switching the wind generating set from a standby mode to a maintenance mode on the premise that the safety of the wind generating set is ensured; (2) manually controlling a blade-changing system to drive three blades to zero; and (3) disconnecting a safe chain and enabling the three blades of the blade-changing system to be simultaneously feathered to 91 DEG by utilizing the blade-changing battery, comparing the time and the blade-changing speed of the blades which are suddenly feathered from 0 to 91 DEG with a normal value, judging whether the blade-changing battery has sufficient capacity or not to satisfy the emergent feathering requirement, and avoiding the situation that the battery capacity is insufficient in the running process of the wind generating set. Through the emergent feathering, the battery is tested by utilizing a discharging way of a blade-loaded battery, so that the test accuracy of the blade-changing battery capacity is ensured. The test of the blade-changing battery can be completed by in-situ test personnel of a wind field in a central control room, so that convenience and quickness can be realized, and a great amount of manpower and material resource can be saved.
Description
technical field [0001] The invention relates to the field of wind power control, in particular to a method for testing a pitch battery of a megawatt wind turbine. 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 configured at 216V. The pitch system battery pack 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, and the battery drives the pitch motor. The paddles ...
Claims
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IPC IPC(8): G01R31/36
Inventor 李永战董健刘昊柯超吉国华
Owner GUODIAN UNITED POWER TECH