A tip speed ratio control system and method for a wind turbine wind wheel test

Abstract

The invention belongs to the technical field of wind tunnel tests, and discloses a tip speed ratio control system and method for a wind turbine wind wheel test; a tip speed ratio setting module is used to accept the set value of the tip speed ratio, and set The serial matching relationship between the flow wind speed and the wind rotor speed value calculated by the fixed value is used as the control target, and the series matching relationship is input into the target monitoring module; the target monitoring module is used to monitor the wind rotor speed and the incoming wind speed in real time, according to these two parameters Calculate the real-time tip speed ratio from the actual measured value, compare it with the input of the tip speed ratio setting module, and input the judgment result to the controller; They are respectively sent to the driving mode module or the braking mode module; the controller receives real-time monitoring values ​​and judgment results during the whole control process, and performs mode selection or switching in real time. The control precision of the tip speed ratio of the present invention reaches 0.2%, which is more than 2 times higher than that of the traditional control technology.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests for wind turbines, and in particular relates to a tip speed ratio control system and method for wind turbine wind wheel tests. Background technique [0002] When designing a wind turbine, it is necessary to consider how the aerodynamic performance of the blades and rotor varies with the tip speed ratio at different wind speeds. Correspondingly, in the wind tunnel test of the wind turbine, the speed of the wind rotor should be controlled under various incoming wind speeds to realize the simulation of the required peak speed ratio conditions. At present, the commonly used technologies in the industry mainly include two ways of adjusting the tip speed ratio. One is to use the method of "generator (+ controller or rectifier bridge) + adjustable resistive load" to control the tip speed ratio of the wind rotor. Start the wind tunnel to reach the predetermined wind speed, the airflow drives t...

AI Technical Summary

Problems solved by technology

[0004] (1) Using the "generator + load" method to control the tip speed ratio, when entering a specific wind rotor speed range, the wind rotor speed fluctuates greatly, and it is easy to overshoot, making it difficult to control the tip speed ratio stably and accurately; low The wind rotor cannot start or cannot reach the required speed under the wind speed

The problem with this technology is: under the above two conditions, the corresponding peak speed ratio simulation requirements cannot be met, which affects the integrity of the wind rotor performance evaluation

[0005] (2) The motor is used to directly drive the wind rotor, and the peak speed ratio can only be simulated at low wind speed by forcibly matching the speed of the wind rotor and the incoming wind speed to simulate the peak speed ratio.

The problems of this technology are: the Reynolds number of the test is low; it cannot meet the requirements of the dynamic test; the working conditions corresponding to the higher wind speed cannot be simulated

But there is no ready-made technology to draw on

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