Electric generator control method based on power factor correction and rectification algorithm in micro grid construction

Abstract

The invention discloses a permanent magnetic wind electric generator control method based on a power factor correction and rectification algorithm in micro grid construction. A three-phase PMSG is controlled through a PFC method, and in order to meet the requirement for rotor position information needed in the control, an original position di / dt detection method, a rotation high-frequency voltage injection method and a double-salient-pole decoupling observer are combined. The three-phase PMSG is controlled through the PFC method, the original position di / dt detection method, the rotation high-frequency voltage injection method and the double-salient-pole decoupling observer are combined to accurately and effectively provide accurate and reliable rotor position information to current control of the PMSG, so that current harmonic content is reduced, power factors in the PMSG approach 1, direct-current output is maintained, and good control of the PMSG based on the PFC method is achieved.

Description

technical field [0001] The invention relates to a permanent magnet wind generator control method based on a power factor correction rectification algorithm in the construction of a microgrid. The PFC (Power Factor Correction, power factor correction) method is used to control the PMSG. For position information, the initial position di / dt detection method, the rotating high-frequency voltage injection method and the double-saliency decoupling observer are combined. Background technique [0002] At present, in various structures of wind power generation systems, the scheme of permanent magnet synchronous generator (PMSG) has the advantages of high efficiency, no need for excitation circuit, etc., and plays an important role. Especially in small wind power generation systems, PMSG has been more applied due to these advantages. The wind power generation system using PMSG needs to use a full-power power electronic converter to convert the variable-voltage and variable-frequency ...

AI Technical Summary

Problems solved by technology

However, the existence of mechanical sensors has brought many disadvantages: 1) The number of connection elements between the motor and the controller increases, the pit interference ability becomes worse, and the system reliability is reduced; 2) The space size and volume of the motor are increased, reducing the Increase the power density, increase the hardware cost and maintenance cost of the system; 3) In high temperature and strong corrosion environment, the performance of the sensor will deteriorate or even fail, resulting in the failure of the motor drive system to work normally

The above points are the main reasons for the unstable operation of the wind power generation system.

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