Wind power generation maximum output power tracking method and system based on rotational speed control

Abstract

The invention discloses a wind power generation maximum output power tracking method and system based on rotation speed control. The method comprises the steps that a power given value is obtained according to the current rotation speed and the reference rotation speed; the feedforward power is determined according to the current rotation speed; the power given value is added to the feedforward power to obtain the power given value before amplitude limiting, and dynamic amplitude limiting is conducted to obtain the power given value after amplitude limiting; the output power of a wind driven generator is subtracted from the power given value after amplitude limiting, and a current given value is obtained through PI control; and the output current of the wind driven generator is subtracted from the current given value, and a control signal used for controlling the wind driven generator to generate power is obtained through PI control. The system comprises a rotation speed outer loop unit, a feedforward power searching unit, a power given unit, a power given amplitude limiting unit, a power inner loop unit and a current inner loop unit. By the adoption of the wind power generation maximum output power tracking method and system, the sensibility of external parameters containing wind speed measurement and a maximum power curve can be tracked with the maximum power, and the maximum power point can be tracked rapidly and accurately.

Description

technical field [0001] The invention relates to wind power technology, in particular to a method and system for tracking the maximum output power of wind power generation based on speed control. Background technique [0002] Wind energy is random and uncertain. Under different wind speeds, the maximum power that the wind power generation system can capture is related to the blade tip speed ratio of the wind rotor (that is, the ratio of the linear speed of the blade tip to the passing wind speed) and the pitch angle. In the case of a certain pitch angle, the relationship between wind energy and rotational speed is as follows: figure 1 shown. It can be seen that each wind speed (V 1 ~V 3 ), there is only one rotational speed and maximum power point (ω 1 ~ ω 3 ) Correspondingly, as the wind speed increases, the speed corresponding to the maximum power point also increases. [0003] At present, the conventional maximum power tracking control methods in variable-speed cons...

AI Technical Summary

Problems solved by technology

However, its performance is still affected by the accuracy of the wind speed measurement

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