Rotor position estimation and correction method for permanent magnet synchronous generator

Abstract

The invention provides a method for estimating and correcting the position of a permanent-magnetic synchronous generator rotor. The method comprises the following steps that: by taking zero crossing points of the pole-tip phase / line voltage of a motor as boundaries, a 360-degree electrical angle of a motor rotor is divided into twelve electrical-angle intervals; by taking the relative relation between the phase / line voltage of three phase and zero as a general judgment method of a current angle interval and taking a special judgment process of the current electrical-angle interval provided as a basis, the current electrical-angle interval is judged; according to the electrical rotational speed of the generator rotor, an electrical-angle increment of the motor rotor is obtained through calculation; the sum of the increments of an angle corresponding to an initial point and the electrical angle relative to the initial point in each electrical-angle interval is a position signal of the motor rotor; by taking the quantity of the position signal as the quantity of a basic position signal, the deviation quantity of the position information of the motor rotor is estimated through specific control algorithm; and by taking the deviation quantity as the feedback quantity of a position-correcting link, the quantity of the basic position signal is compensated with an output result through the regulation of a regulator, so that an accurate position signal of the motor rotor can be obtained.

Description

technical field [0001] The invention relates to a method for estimating and correcting the rotor position of a permanent magnet synchronous generator. Background technique [0002] The human demand for energy continues to increase, but the conventional energy available on the earth is limited, and with the massive consumption of non-renewable fuels, the greenhouse effect is generated, and the natural ecological environment continues to deteriorate. The development of renewable, clean and non-polluting new energy has attracted the attention of all walks of life. Among them, wind energy is one of the power generation methods with the most mature technology, the most large-scale development conditions and commercial development prospects in new energy. In recent years, wind energy has made great progress. . In order for wind energy to compete with other energy sources, power generation efficiency, reliability, and cost must be considered. Based on these requirements, wind pow...

AI Technical Summary

Problems solved by technology

However, this type of sensor has problems such as installation, cable connection, failure, etc., and affects the reliability of the system and limits the scope of use of the system. It is difficult to meet the requirements of the accuracy of the type sensor, so it is particularly important to realize the sensorless control of the permanent magnet synchronous generator

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