Synchronous measuring device and method for wind turbine pneumatic efficiency and system power generation efficiency

Abstract

The invention provides a synchronous measuring device and method for wind turbine pneumatic efficiency and system power generation efficiency. A double-head power generator is adopted as a power generator of the device. A base is fixed into a wind tunnel testing section. The power generator and a torque rotational speed meter are fixed to the base. One end of the torque rotational speed meter is connected with a transmission shaft. A wind wheel is fixed to a transmission shaft. The wind wheel is located on the upper stream of the incoming flow direction of the wind tunnel testing section. Theother end of the torque rotational speed meter is fixedly connected with one end of the power generator. The other end of the power generator is fixedly connected with a motor. A frequency converter is connected with the motor. The rotating speed of the motor is adjusted through the frequency converter. 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. According to the method, after the wind speed is set, the no-load rotating speed of the wind wheel is measured;the frequency converter adjusts the rotating speed of the motor and drives the wind wheel to rotate; torque of a wind wheel shaft, the rotating speed and the output power of the power generator are measured; and tested data is transmitted into the computer and calculated to obtain the pneumatic efficiency of the wind wheel, and the power generation efficiency and the power generator efficiency ofthe wind turbine system.

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 method for synchronously measuring the aerodynamic efficiency of a wind turbine and the power generation efficiency of a system. Background technique [0002] The environment and energy are the basis for human survival. The huge consumption of fossil energy has caused serious environmental pollution problems. The active development of new energy and renewable energy will help alleviate energy and environmental problems. Wind energy is a clean and non-polluting renewable energy, and its utilization technology has developed to a relatively mature level. As one of the places with the most concentrated energy demand in cities, the use of urban wind farms on site is the focus and hotspot of current research, among which small wind turbines are more suitable for off-grid distributed pow...

AI Technical Summary

Problems solved by technology

Because the experimental equipment used in the two experiments is different, there will inevitably be equipment errors; moreover, there will be random errors in the adjustment of wind speed and rotation speed in different experiments; therefore, under the influence of many data errors, it is difficult to guarantee the power generation The accuracy of the efficiency of the machine

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

[0006] For this reason, the Chinese patent No. ZL201610781702.7 proposes a device and method for synchronously testing the aerodynamic efficiency and power generation efficiency of a wind turbine. This patent can measure and calculate the aerodynamic efficiency, Generator efficiency and system power generation efficiency, however, this patent still has limitations in the wind turbine testing process, it can only test wind turbines whose torque decreases monotonically with the increase of speed, such as drag wind turbines, which can be obtained from low Complete experimental data corresponding to high rotational speed; however, for wind turbines whose torque does not decrease monotonously with the increase of rotational speed, such as lift-type wind turbines, the load on the electromagnetic brake increases gradually during the experiment, and the wind force The speed of the wind turbine gradually decreases. When the load makes the speed lower than the critical speed, the load moment is greater than the aerodynamic torque of the wind turbine, and the wind turbine will stop rotating instantaneously.

Therefore, this patent can only measure the torque from the maximum speed to the critical speed of the wind turbine, and only incomplete experimental data corresponding to the critical speed to high speed are obtained.

Images