Control circuit for measuring digital rotating speed of wind-driven generator

Abstract

The invention discloses a control circuit for measuring digital rotating speed of a wind-driven generator, which comprises an input circuit, a shaping circuit, a counting circuit, a multi-resonant shock circuit, a drive circuit, a relay and a power supply circuit. The input circuit is connected with the output of a three-phase power supply of the wind-driven generator; the output of the input circuit is connected with the input of the shaping circuit; the output of the shaping circuit is connected to the counting input end of the counting circuit; the output of the counting circuit is connected with the input of the drive circuit; the output of the drive circuit is connected to the control end of the relay; the relay is connected between the wind-driven generator and a dummy load; and theoutput of the multi-resonant shock circuit is connected to the clear end of the counting circuit. The control circuit fully uses the characteristics that the output frequency of the wind-driven generator is in proportion to the rotating speed of the wind-driven generator to measure the rotating speed of the wind-driven generator through the frequency so as to control whether the wind-driven generator is provided with the dummy load or not. The control circuit has the advantages of low power consumption, high accuracy, high reliability and low cost.

Description

technical field [0001] The invention relates to a control circuit, in particular to a control circuit based on digital speed measurement of a wind power generator. Background technique [0002] A wind generator is a device that uses wind power to generate electricity. When the wind power drives the rotor of the generator to rotate, the stator of the generator outputs electric energy. In a wind power generation system, when the wind is too strong, it will cause the wind turbine to fly (that is, the speed is too fast), so it is very necessary to measure the speed of the wind power generator, so that when the speed is too high, it will bring a dummy load to the wind turbine. , to reduce the speed of the wind turbine. At present, the traditional method is to use the current detection method to detect the speed of the wind turbine, but the current of the wind turbine varies greatly due to the influence of the load. The transformer used for large current detection is expensive, b...

AI Technical Summary

Problems solved by technology

At present, the traditional method is to use the current detection method to detect the speed of the wind turbine, but the current of the wind turbine is greatly affected by the load, and the transformer used for large current detection is expensive, bulky, and inconvenient to install.

Therefore, the detected current cannot really reflect the rotation speed of the generator, and the temperature drift and the deviation of the reference point will affect the accuracy and stability of the measurement to a large extent, resulting in large errors

Images