Device and method for synchronously testing pneumatic efficiency and power generation efficiency of wind turbine

Abstract

The invention provides a device and method for synchronously testing pneumatic efficiency and power generation efficiency of a wind turbine. A base of the device is fixed in a wind tunnel test section, a power generator and a torque rotational speed meter are fixedly installed on the base, a first transmission shaft is connected with one end of the torque rotational speed meter, a wind wheel is fixedly arranged on the first transmission shaft, and the wind wheel is located at the upstream of the inflow direction of the wind tunnel test section; a second transmission shaft is connected to the other end of the torque rotational speed meter and fixedly connected with a motor shaft of the power generator; a power meter is connected with the power generator; the data output end of the torque rotational speed meter and the data output end of the power meter are connected with a computer; a sliding rheostat is connected between the power meter and the power generator, the power generator, the power meter and the sliding rheostat form a closed circuit, and the sliding rheostat serves as the load of the power generator. The method includes the steps that the wind wheel is driven to rotate at set wind speed; shaft torque and rotation speed of the wind wheel and output power of the power generator are measured; the measured data is transmitted into the computer to calculate pneumatic efficiency of the wind wheel and power generation efficiency of the whole wind turbine and the power generator.

Description

technical field [0001] The invention belongs to the technical field of testing the aerodynamic characteristics and power characteristics of a wind turbine, and in particular relates to a device and a method for synchronously testing the aerodynamic efficiency and power generation efficiency of a wind turbine. Background technique [0002] As a renewable clean energy, wind energy has become one of the fastest-growing and applied new energy sources. The most important equipment for utilizing wind energy is the wind turbine. The wind wheel and the generator are two important components of the wind turbine. Moreover, the aerodynamic efficiency of the wind rotor and the power generation efficiency of the generator directly determine the wind energy utilization efficiency of the wind turbine. Therefore, it is necessary to accurately test the aerodynamic efficiency of the wind rotor and the power generation efficiency of the generator. At present, it is mainly realized through wind ...

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Problems solved by technology

[0004] For the first type of wind tunnel experiment that tests the aerodynamic efficiency of the wind rotor, it is only used to evaluate the pros and cons of the wind rotor design; for the second type of wind tunnel experiment that tests the power generation efficiency of the wind turbine As far as the hole experiment is concerned, it can only measure the power generation efficiency of the wind turbine, but cannot measure the aerodynamic efficiency of the wind rotor and the power generation efficiency of the generator, so it cannot be used to accurately evaluate the aerodynamic efficiency of the wind rotor and the power generation efficiency of the generator. Power generation efficiency; since the power generation efficiency of the wind turbine is the result of matching the aerodynamic efficiency of the wind rotor with the power generation efficiency of the generator, it is difficult to solve the generator matching problem through the second wind tunnel experiment

[0005] At present, the power generation efficiency of the generator can only be calculated by the data obtained from two independent wind tunnel experiments. Since the experimental equipment used in the two wind tunnel experiments is different, there will inevitably be equipment errors; The wind speed of the wind tunnel set in these wind tunnel experiments is the same, but the adjustment of the wind speed of the wind tunnel in the actual experiment will also have random errors; therefore, under the influence of many data errors, it is difficult to guarantee the accuracy of the power generation efficiency of the generator

Since the wind tunnel experiment must be carried out independently in two parts, the experiment process is time-consuming and laborious, and the experiment efficiency is not high

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