Measuring device for aerodynamic characteristics of small-power wind turbines suitable for wind tunnel tests

Abstract

The invention relates to a small-power wind turbine aerodynamic characteristic measurement device suitable for wind tunnel tests. The wind turbine includes a hub installed at the front end of the fan shaft, blades are installed on the circumference of the hub, the fan shaft is coaxial with the wind tunnel, and the middle section of the fan shaft is installed In the bearing seat, the rear end of the fan shaft is connected to one end of the torque meter through coupling one, and the other end of the torque meter is connected to the rotor shaft of the three-phase asynchronous generator through coupling two; the bearing seat and the torque meter are installed On the wind turbine base, the wind turbine base and the three-phase asynchronous generator are fixed on a common base, the center of gravity of the common base is placed on a six-component balance, and the six-component balance is fixed on the top of the wind turbine support. The output terminal of the generator is connected to the input terminal of the three-phase full-bridge rectifier circuit through an air switch and a fuse, and the output terminal of the three-phase full-bridge rectifier circuit is connected to a main circuit filter capacitor group and connected to the load through a solid-state relay. The device can accurately measure the aerodynamic performance parameters of the wind turbine when the rotating speed is stable.

Description

technical field [0001] The invention relates to a wind tunnel test device, in particular to a small-power wind turbine aerodynamic characteristic measuring device suitable for wind tunnel tests, and belongs to the technical field of wind turbine measurement. Background technique [0002] The wind tunnel is a kind of pipe shape experimental equipment that can artificially generate and control the airflow to simulate the flow of air around the aircraft or objects, and can measure the effect of the airflow on the object and observe physical phenomena. Effective tool. [0003] In the existing wind turbine testing technology, a dual-drive parallel PWM back-to-back wind power converter is often used for wind turbine control, which has high power and high cost. Considering that in the permanent magnet direct-drive wind power generation system, the full-power converter must carry all the power generated by the generator, and the capacity of the converter should be selected accordin...

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Problems solved by technology

[0003] In the existing wind turbine testing technology, the wind turbine control often adopts a dual-drive parallel PWM back-to-back wind power converter, which has high power and high cost

Considering that in the permanent magnet direct-drive wind power generation system, the full-power converter must carry all the power generated by the generator, and the capacity of the converter should be selected according to 100% power, and the capacity is relatively large, so it is not suitable for small power plants within 1.5kW. In the test of aerodynamic characteristics of wind tunnel with small power and small cross-section

Moreover, to measure the aerodynamic characteristics of a wind turbine in a wind tunnel, it is necessary to precisely control the speed of the fan within a certain range under different inflow conditions, which is inconsistent with the existing mature wind turbine control strategies on the market. Most of the wind turbine control strategies are to ensure that the wind turbine operates at the maximum output power position, and the control of the low-power wind turbine model is difficult. When the current is unstable or the incoming wind speed is disturbed, it is difficult to return the fan speed to the specified value. In the speed range, stall is prone to occur. So far, the existing technology does not have a mature, reliable and low-cost wind turbine speed control device suitable for measuring the aerodynamic characteristics of small-power wind turbines.

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