Compensation method and device for rotor position of permanent magnet synchronous generator

Abstract

The invention provides a compensation method and device for the rotor position of a permanent magnet synchronous generator. The compensation method comprises the steps of dividing the rated power of the generator into N segments to obtain N power interval sections; for each power interval section, when the difference between the output active power of the generator and an active power set value ofthe generator in the corresponding power interval section is less than a first preset threshold, estimating the rotor position of the power interval section; applying offset to the estimated rotor position of each power interval section, and correspondingly obtaining an active power value of each power interval section after the rotor position with the applied offset is obtained, wherein the active power value includes a converter network side port active power output value or a generator active power output value; determining the optimal rotor position offset of each power interval section according to each active power value in the power interval section; and compensating the estimated rotor position of the power interval section according to the optimal rotor position offset.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of wind power generation, in particular to a method and device for compensating the rotor position of a permanent magnet synchronous generator. Background technique [0002] With the continuous improvement of CNC machine tool technology for high precision and high dynamic performance requirements, permanent magnet synchronous generators are widely used in the field of wind power generation due to their simple structure, high efficiency, good controllability, and wide speed range. Vector control technology and direct torque control technology are commonly used control technologies for permanent magnet synchronous generator control systems. Both vector control technology and direct torque control technology need to obtain the pole rotor position in the permanent magnet synchronous generator, which is used to convert the three-phase current in the three-phase coordinate system into the...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for compensating the rotor position of a permanent magnet synchronous generator. There is a deviation between the reactive current and the actual value, and then the maximum torque-current ratio control cannot be realized, which eventually leads to the technical problem that the power generation efficiency of the permanent magnet synchronous generator is reduced

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