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On-line identification method and system for flux linkage of permanent magnet synchronous generator

A permanent magnet synchronization and identification method technology, applied in the field of online flux linkage identification, can solve the problems of poor accuracy, slow speed, and time-consuming online flux linkage identification, and achieve the effect of simple design and improved accuracy

Active Publication Date: 2022-02-18
XINJIANG UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides an online flux linkage identification method and system for a permanent magnet synchronous generator, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problems of high time consumption, poor accuracy, and speed in online flux linkage identification existing in the prior art. slow problem

Method used

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  • On-line identification method and system for flux linkage of permanent magnet synchronous generator
  • On-line identification method and system for flux linkage of permanent magnet synchronous generator
  • On-line identification method and system for flux linkage of permanent magnet synchronous generator

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Embodiment 1

[0085] Embodiment 1: as attached figure 1 , 2 , 3, 4, 5, and 6, an online identification method for flux linkage of a permanent magnet synchronous generator, comprising the following steps:

[0086] S101: Obtain the current Q-axis command voltage value Uq, the Q-axis real current value Iq, and the motor speed value of the machine-side converter unit 11 in the current running state;

[0087] S102: Calculate the back EMF value according to the stator voltage equation, and obtain a stable average value of the equivalent back EMF through a low-pass filter;

[0088] S103: Calculate the permanent magnet flux linkage according to the difference elimination method according to the approximate equivalent back electromotive force at different rotational speeds.

[0089] According to actual needs, the above-mentioned online identification method of permanent magnet synchronous generator flux linkage can be further optimized or / and improved:

[0090] as attached figure 1 , 2 As shown...

Embodiment 2

[0148] Embodiment 2: as Figure 5 , 6 As shown, a permanent magnet synchronous generator flux linkage online identification system includes an energy source terminal 12, a machine-side converter unit 11, and a machine-side converter control system 13 for online identification of permanent magnet synchronous generator flux linkage;

[0149] The energy source terminal 12 provides the required bus voltage to the machine-side converter unit 11;

[0150] The machine-side converter unit 11 includes a permanent magnet synchronous generator 1104, a current measurement sensor 1101 for measuring the three-phase current of the permanent magnet synchronous generator 1104, a temperature sensor 1105 for measuring the operating temperature of the permanent magnet synchronous generator 1104, and a DC The three-phase bridge module 1103 for AC power conversion and the three-phase bridge driver 1102 for signal connection; the output terminals of the current measurement sensor 1101 and the tempe...

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Abstract

The present invention relates to the field of online flux linkage identification technology, and is an online identification method and system for flux linkage of a permanent magnet synchronous generator. The former includes S101: obtaining the current Q-axis command voltage value Uq of the machine-side converter unit in the current operating state, The real current value Iq and the speed value of the permanent magnet synchronous generator; S102: Calculate the back EMF value according to the stator voltage equation, calculate the average value or use a low-pass filter to obtain a stable equivalent back EMF; S103: According to the equivalent back EMF at different speeds Electric potential, the permanent magnet flux linkage is calculated according to the differential elimination method. The invention utilizes the relationship between the flux linkage and the back EMF of the permanent magnet synchronous generator stator voltage equation, obtains the real permanent magnet synchronous generator terminal stator command voltage through the voltage reconstruction theory and distortion compensation, and uses the rotor temperature-resistance relationship curve to correct the rotor The resistance value is calculated to obtain the flux linkage of the permanent magnet, which improves the accuracy of the flux linkage identification of the permanent magnet synchronous generator.

Description

technical field [0001] The invention relates to the technical field of on-line identification of flux linkage, and relates to a method and system for online identification of flux linkage of a permanent magnet synchronous generator. Background technique [0002] In recent years, wind power has developed vigorously, and its installed capacity has steadily increased, accounting for more than 4.1% of the total electricity. The core of wind power generation is the intelligent control and grid-connection technology of wind turbines. As the key device of energy conversion, the reliable operation of the converter is very important, and the control strategy of the machine-side converter based on sensorless vector control can significantly improve Crew reliability. [0003] According to the relationship between the PMSM stator terminal voltage and the stator current, the method of estimating the position and speed of the rotor based on the mathematical model of the motor is called t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P21/18
CPCH02P21/141H02P21/18
Inventor 王海云左惠文唐新安余英
Owner XINJIANG UNIVERSITY