Detection platform, device and method for variable pitch frequency converter of variable pitch system

Abstract

The invention discloses a detection platform for a variable pitch frequency converter of a variable pitch system. The detection platform comprises a PC operation part and a testing part which are connected with the variable pitch frequency converter, wherein the testing part comprises a beckhoff module group, an enabling relay, a direct-current power supply, a direct-current voltmeter, an alternating current power supply, an alternating current voltmeter, a discharge resistor, another direct-current voltmeter connected with the discharge resistor in parallel, a motor and an alternating current ammeter, wherein the beckhoff module group and the enabling relay are connected with the frequency converter; the discharge resistor is used for discharging electric energy of a direct-current bus; the motor is connected with the variable pitch frequency converter; the alternating current ammeter is connected with the motor in parallel. The invention further discloses a detection device comprising the detection platform and a detection method for the variable pitch frequency converter of the variable pitch system. By simulating the normal situation and the special situation of the variable pitch system in a wind generator set in the practical operation process, the detection platform, the detection device and the detection method can be used for detecting the property of the variable pitch frequency converter comprehensively; the working state of the frequency converter is displayed through a triggering signal and a feedback signal; the electric characteristics of the frequency converter are detected through data measured by using digital voltmeters / ammeters, and further hidden dangers can be eliminated and the repairing quality of a product is improved.

Description

technical field [0001] The invention relates to the field of detection of electric control devices in wind turbines, in particular to a detection platform, device and method for pitch frequency converters in pitch systems of wind turbines. Background technique [0002] Nowadays, the mainstream wind turbines on the market all adopt the variable-pitch variable-speed control method, because the advantages of this control method are: below the rated wind speed, the speed of the generator can be controlled to track the wind speed and the optimal wind energy utilization coefficient Cp; above the rated wind speed Through the joint action of the torque controller and the pitch inverter, the power and torque are relatively stable and the power curve is better. This requires the pitch control system to be applied to the wind turbine, such as the LUST pitch system. As an important core component of the wind turbine, the LUST pitch system can control the position of the blade angle to ...

AI Technical Summary

Problems solved by technology

And because most of the wind turbines are located at the end of the entire power grid, and the quality of the power grid is poor, resulting in a large number of failures in the pitch system components, in order to save costs, it is necessary to replace the core components of the failed LUST pitch system Carry out maintenance for secondary use, but how to test the performance of the repaired device and whether the test results meet the requirements of the use parameters will be an important indicator to measure whether the repaired product is qualified

[0003] At present, there is no systematic detection platform for the PITCHmaster detection of the pitch inverter in the failed LUST pitch system, but a high-power resistor is connected to the output end of the pitch inverter, aiming at the output characteristics of the pitch inverter Carry out testing, such as basic testing of rated current and rated voltage, without long-term load operation. This kind of testing method has a single form of testing content, and cannot perform integrity testing on the performance of the pitch inverter PITCHmaster, leaving many hidden dangers , resulting in a lower repair rate and a higher repair rate

[0004] It can be seen that the above-mentioned existing detection method and use of the pitch frequency converter after maintenance obviously still have inconvenience and defects, and it is urgent to be further improved.

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