Method for controlling speed-limitation speed-stabilization current-limitation power generation of wind driven generator

Abstract

The invention discloses a method for controlling speed-limitation speed-stabilization current-limitation power generation of a wind driven generator. The method includes the steps that current detection and rotation speed detection are conducted on an output line of the wind driven generator through a processor; when the processor detects that the rotation speed of the wind driven generator reaches the set rotation speed, unloading parts are started to work through the processor, and the unloading quantity is modulated and controlled through a PWM pulse; when the processor detects that the input average current surpasses the set current and continues for a period of the set time, the unloading quantity is modulated and controlled by the processor through the PWM pulse, the wind driven generator is controlled to further operate at an uncontrolled speed so that the input average current of the wind driven generator can be reduced; when the processor detects continuous overcurrent of the input current, the processor gives out a command immediately, a brake is released to do motion, the wind driven generator is made to operate freely, so that the input current begins to be converted to charging current from unloading current, the processor conducts intermittent control over the brake of the wind driven generator or the unloading state, and thus operation of the wind driven generator can be kept in a non-overcurrent and non-overspeed state. The utilization rate of wind energy is increased, and the defect that the wind driven generator is prone to burning down is overcome.

Description

technical field [0001] The present invention relates to the field of wind power generation, in particular to a control method for wind power generators to generate electricity at a speed-limited, stable-speed, and current-limited manner. Background technique [0002] At present, the application of new energy (wind power generation, solar power generation) has entered a practical stage, and the corresponding electronic control devices (such as wind and solar hybrid controllers, wind turbine controllers, etc.) play a pivotal role. Especially for the control of wind turbines. Due to the uncertainty of the wind, there are many challenging issues in creating a controller for safe and efficient power generation of wind turbines, especially dealing with typhoon resistance. If the rotational speed of the wind turbine is not limited, problems such as broken blades of the wind generator or low power generation efficiency may occur. [0003] There are relatively few wind power genera...

AI Technical Summary

Problems solved by technology

The consequences are: on the one hand, the wind resource is very good, but the wind turbine stops generating power, causing the wind utilization rate to be close to 0 when the wind is strong.

Cause waste of wind resources; on the other hand, after the fan is unloaded and braked, if the wind energy is too large, the fan cannot be maintained at a very low speed, and the unloaded braking current will become very large, exceeding the allowable current of the fan generator. Caused the generator to overheat and burn out

This type of control method is effective when the wind is not strong. If there is a strong wind or a typhoon, it will only damage the expensive wind turbines.

Generally speaking, the existing technology has the defects of blind control mode, low utilization rate of wind energy, and easy burning of wind turbines

Images