Device and method for calibrating and detecting sensor and AD convertor of multiple devices

Abstract

The invention provides a device and a method for calibrating and detecting a sensor and an AD convertor of multiple devices. An acquisition processing module comprises a plurality of acquisition processing units, and the acquisition processing units are connected in parallel; a plurality of signal sensing units of a signal sensing unit group are respectively connected with each acquisition processing unit, an input source signal is converted into a secondary side signal corresponding with acquisition requirements through the signal sensing unit group, and the secondary side signal is converted into a digital signal through the acquisition processing units and then is transmitted to an upper computer through a 485 communication circuit; and the upper computer processes and displays signal data. The device and the method for calibrating and detecting the sensor and the AD convertor of multiple devices have the advantages that a large linear error in collected data due to an own characteristic of operational amplification in the sensor and the AD convertor is avoided, the technical problems of deviation and scaling of the collected data are solved, and furthermore normal operation of a wind power frequency converter is guaranteed. The device and the method for calibrating and detecting the sensor and the AD convertor of multiple devices have the advantages that a skillful engineer only needs 1-3 minutes to complete adjusting a single wind power frequency converter, a personal error is small and the like.

Description

technical field [0001] The invention belongs to the field of detection equipment for sensors and AD converters, in particular to a system for calibrating and detecting sensors and AD converters of multiple devices. Background technique [0002] As a clean and renewable energy, wind energy has been paid more and more attention by countries all over the world. Electricity generated by wind power is much cheaper than electricity generated by small internal combustion engines. In recent years, the operation time of the frequency converter to control the rotor current frequency of the generator is below the millisecond level. When the wind speed changes at a high frequency, instantaneously changing the generator rotor current frequency through the frequency converter can ensure that the generator set can keep up with the frequent changes in wind speed, so that the unit power can be output stably, reducing the adverse impact on the power grid, and at the same time reducing the pi...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, during the calibration process of the AD channel, the experimenter usually uses an oscilloscope to check the above-mentioned offset, and manually reads to observe the accuracy of the calibration. A skilled engineer completes the adjustment of a single wind power inverter The work takes 2-3 hours, and the human error is large

The manual detection of the sensor is a heavy task, without fixed tooling, it is very difficult to realize

Generally, there are usually many inverters that need to be shipped from the factory in each batch, and the waveform can only be manually inspected for random inspection, which cannot ensure the correctness of each sensor.

There is no effective detection method to test the linear characteristics of the sensor, and technical problems such as rated value detection cannot be solved

At the same time, there are technical problems such as wasting a lot of manpower, material resources and time, and the accuracy is not easy to control.

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