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Field weakening control method for direct-drive permanent magnet generator

A permanent magnet generator and field weakening control technology, applied in synchronous generator control, generator control through magnetic field changes, power management and other directions, can solve the problems of complex synchronous motor field weakening control methods, etc. Simple process and low computational cost

Pending Publication Date: 2022-06-07
DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the present invention proposes a field-weakening control method for direct-drive permanent magnet generators, which can effectively solve the complicated problems of the existing synchronous motor field-weakening control methods

Method used

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  • Field weakening control method for direct-drive permanent magnet generator
  • Field weakening control method for direct-drive permanent magnet generator
  • Field weakening control method for direct-drive permanent magnet generator

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Embodiment 1

[0039] As a basic embodiment of the present invention, the present invention includes a field weakening control method for a direct-drive permanent magnet generator, including a machine-side rotor flux linkage orientation step and a reactive current given value calculation. Wherein, the calculation of the given value of reactive current specifically includes the following steps:

[0040] S 21 . Orient the d and q-axis rotor flux linkages in the two-phase rotating coordinate system obtained through the rotor flux linkage orientation step on the machine side, and lock the phases to obtain the frequency.

[0041] S 22 . Calculate impedance and related intermediate values;

[0042] S 23 .According to the steady-state field weakening control equation of the permanent magnet synchronous motor in the rotating coordinate system, the upper and lower limit values ​​of the torque converted by reactive power are calculated, and the given value of reactive current is obtained.

Embodiment 2

[0044] As a preferred embodiment of the present invention, the present invention includes a field weakening control method for a direct-drive permanent magnet generator, including a machine-side rotor flux linkage orientation step and a reactive current given value calculation.

[0045] Wherein, the machine-side rotor flux linkage orientation step specifically includes the following steps:

[0046] S 11 .Convert the three-phase line voltage and current of the stator into the instantaneous voltage and current values ​​in the two-phase stationary coordinate system;

[0047] S 12 . From the instantaneous value of voltage and instantaneous value of current in the two-phase static coordinate system, the α and β-axis rotor flux linkages in the two-phase static coordinate system are estimated by the mathematical model of the permanent magnet synchronous generator in the two-phase static coordinate system;

[0048] S 13 . Perform coordinate rotation transformation on rotor flux lin...

Embodiment 3

[0054] As the best mode for carrying out the present invention, refer to the appendix of the specification. figure 1 The invention includes a field weakening control method for a direct-drive permanent magnet generator, which includes a machine-side rotor flux linkage orientation step and a calculation of a given limit value of reactive current.

[0055] Wherein, the machine-side rotor flux linkage orientation step specifically includes the following steps:

[0056] S 11 .The three-phase line voltage of the stator v ab (t), v bc (t), v ca (t) is converted into the instantaneous value u of the voltage in the two-phase stationary coordinate system α , u β , the three-phase current i of the stator a (t), i b (t), i c (t) is converted into the instantaneous value i of the current in the two-phase stationary coordinate system α , i β . in,

[0057]

[0058]

[0059] S 12 . From the instantaneous voltage and current values ​​in the two-phase static coordinate syst...

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Abstract

The invention relates to the technical field of control of a three-phase converter of a power system, in particular to a field weakening control method of a direct-drive permanent magnet generator, which comprises a machine side rotor flux linkage orientation step and a reactive current given value calculation step. The reactive current given value calculation specifically comprises the following steps: orienting d-axis and q-axis rotor flux linkages in a two-phase rotating coordinate system obtained through the machine side rotor flux linkage orienting step, and carrying out phase locking to obtain a frequency; calculating impedance and related intermediate values; and according to a permanent magnet synchronous motor steady-state field weakening control equation under the rotating coordinate system, calculating upper and lower limit values of torque converted by reactive power, and obtaining a reactive current given value. Through the method, the problem that an existing synchronous motor field weakening control method is complex can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of control of a three-phase converter of a power system, in particular to a field weakening control method for a direct-drive permanent magnet generator. Background technique [0002] Permanent magnet synchronous generators / motors have been widely used in high-demanding occasions such as wind power generation and electric vehicles due to their high power density, high reliability and high efficiency. When the permanent magnet synchronous motor is running at high speed, the stator voltage will increase with the speed, and the field weakening control technology must be used to reduce the stator voltage to protect the power electronic devices. . The idea of ​​field weakening control of permanent magnet synchronous motor comes from the field control of separately excited DC motor, and the research on field weakening control of permanent magnet synchronous motor began in the mid-1980s. And in the early 1990s fo...

Claims

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Application Information

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IPC IPC(8): H02P9/14H02P103/20
CPCH02P9/14H02P2103/20Y02T10/72
Inventor 刘红彭涛李盛儒李华银邵勤丰孟新光王昌垒何光俊刘志林傅炜娜辛旺李豪耿庆龙王宸陈明刘江华石义金曾百惠李鑫
Owner DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD
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