Method and system for controlling doubly-fed wind generator speed sensor-less

Abstract

The invention provides a method and system for controlling a doubly-fed wind generator speed sensor-less. The method for controlling the doubly-fed wind generator speed sensor-less comprises the following steps that a stator voltage value, a stator current value and a rotor current value of a motor in a k moment are measured and converted according to a sampling period, rotor reference flux linkage in the k moment is calculated and acquired according to the stator voltage value and the stator current value in the k moment, a rotor flux linkage identification value in the k moment is calculated according to a rotor angular speed identification value, a rotor flux linkage identification value and the rotor current value in a k-1 moment, a rotor angular speed identification value in the k-1 moment is calculated and acquired according to the rotor reference flux linkage and the rotor current value in the k-1 moment and the rotor flux linkage identification value in the k moment, and wind generator closed loop feedback control is conducted according to the rotor angular speed identification value in the k-1 moment. By the adoption of a discretization algorithm, a speed identification method based on discrete slip form model reference self-adaptation is provided, and therefore a speed estimated value acquired by the method is accurate. The method for controlling the doubly-fed wind generator speed sensor-less is high in anti-jamming capacity and free of being affected by working conditions.

Description

technical field [0001] The invention relates to a generator control technology, in particular to a speed sensorless control method and system for a double-fed wind power generator. Background technique [0002] The doubly-fed wind turbine can adjust the electromagnetic torque and other parameters during the working process. Generally, the closed-loop control is performed based on the motor speed as the feedback parameter. [0003] No matter which control method is used, it is necessary to obtain the rotational speed of the motor as a feedback parameter. The traditional way to obtain the motor speed is to set a mechanical sensor to measure the speed of the motor, but the sensor measurement method has many defects. The setting of the mechanical sensor increases the system cost and installation technical requirements, and the measurement of the rotational speed changes due to the change of the motor parameters with the working conditions, and is also affected by environmental ...

AI Technical Summary

Problems solved by technology

The setting of the mechanical sensor increases the system cost and installation technical requirements, and the measurement of the rotational speed changes due to the change of the motor parameters with the working conditions, and is also affected by environmental factors, so there is a large error, and the influence of the rotational speed error on the motor control Will increase with the increase of temperature, vibration and other factors

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