Detection method of accumulator capacity of variable-pitch system of wind turbine generator
A wind turbine and capacity detection technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of high hardware cost, large detection device volume, affecting the normal logic control of the pitch system, etc., and achieve the effect of low cost
Inactive Publication Date: 2014-01-08
江苏国科智能电气有限公司 +1
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[0009] The purpose of the present invention is to overcome the disadvantages of the existing battery capacity detection method that the hardware cost needs to be increased, the normal logic control of the pitch control system is affected, and the detection device is large in size, etc., and a method for detecting the battery capacity of the wind turbine pitch system can be provided without On the basis of changing the normal operation mode of the pitch control system, the capacity of the battery is detected online
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0024] The present invention firstly establishes the relationship table of battery ampere-hour voltage drop VPQ and aging rate under different discharge current conditions according to the battery characteristics, and stores them in the data storage area of the programmable logic controller (PLC); according to the new battery voltage provided by the battery manufacturer The relationship between the voltage and the capacity is fitted by fitting the relationship function Q=f(V) between the voltage and the capacity.
[0025] According to the characteristics of the battery itself, the voltage of the battery pack has a certain relationship with the remaining power of the battery, and the aging of the battery is estimated according to the relationship between the aging rate of the battery under different discharge currents and the voltage drop VPQ o...
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The invention provides a detection method of accumulator capacity of a variable-pitch system of a wind turbine generator. In the detection method, the health situation of an accumulator is judged by utilizing the voltage variation when the accumulator discharges electricity, the aging rate of the accumulator is calculated, and the accumulator capacity is calculated by a product of a current open circuit voltage of the accumulator and the aging rate. The method comprises the following concrete steps of: (1) detecting terminal voltage and discharge current of the accumulator when the accumulator of the variable-pitch system discharges electricity; (2) recording terminal voltage drop and discharge current of the accumulator every other 1s in the accumulator discharging process, and calculating the ratio of the voltage drop to the discharge capacity; (3) looking up a table to obtain the aging rate of the accumulator according to the ratio of the voltage drop to the discharge capacity and the discharge current; and (4) measuring the terminal voltage of the accumulator under a condition that the accumulator is in open circuit, multiplying the open circuit voltage by the aging rate of the accumulator to obtain the current capacity of the accumulator.
Description
technical field [0001] The invention relates to a method for detecting the capacity of a variable-pitch accumulator of a wind power generating set. Background technique [0002] At present, the battery is generally used as the backup power supply in the pitch control system of wind power generation. When the power grid fails, the battery is used to supply power to feather the unit. Insufficient battery capacity will cause the unit to fail to feather in an emergency, and in serious cases will cause the unit to fly. [0003] At present, there are three main methods for battery capacity detection: (1) open circuit voltage method; (2) battery internal resistance method, which measures the internal resistance of the battery through high-current discharge, and the internal resistance value reflects the capacity of the battery. (3) Electricity accumulation method, the capacity of the battery is calculated by current integration. [0004] The first method is to display the remaini...
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IPC IPC(8): G01R31/36
Inventor 李海东苏晓东赵栋利赵斌
Owner 江苏国科智能电气有限公司