Tip speed ratio control system and method for 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. The tip speed ratio control system comprisesa tip speed ratio setting module used for receiving a tip speed ratio setting value, calculating a series matching relation of an incoming flow wind speed and a wind wheel rotating speed value according to the tip speed ratio setting value as a control target and inputting the series matching relations into a target monitoring module, the target monitoring module used for monitoring a wind wheel rotating speed and an incoming flow wind speed in real time, calculating a real-time tip speed ratio according to measured values of the two parameters, comparing the real-time tip speed ratio with input of the tip speed ratio setting module and inputting a judgment result to a controller and the controller used for deciding to adopt a drive mode or a braking mode according to a judgment result andsending a command to a drive mode module or a braking mode module; and the controller receives the real-time monitoring values and the judgment result in the full-control process and performs mode selection or switching in real time. For the control method, the control precision of the tip speed ratio reaches 0.2 percent and is improved by 2 times or above compared with the traditional control technology.

Description

Technical field [0001] The invention belongs to the technical field of wind turbine wind tunnel tests, 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 the law of the aerodynamic performance of blades and rotors changing with tip speed ratio under different wind speeds. Correspondingly, in the wind tunnel test of the wind turbine, the rotation speed of the wind wheel must be controlled under various incoming wind speeds to achieve the required tip speed ratio condition simulation. At present, the commonly used technologies in the industry mainly include two tip speed ratio adjustment methods. One is to use the "generator (+ controller or rectifier bridge) + adjustable resistive load" method to control the wind turbine tip speed ratio. Start the wind tunnel to reach a predetermined wind speed, the airflow drives the wind wheel to rot...

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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