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Speed sensor-less method for estimating rotor angle and revolving speed of permanent-magnet synchronous motor

A technology of permanent magnet synchronous motor and speed sensorless, which is applied in the field of speed estimation and rotor angle of permanent magnet synchronous motor, and can solve problems such as large amount of calculation, complex principle, and unstable system

Active Publication Date: 2014-04-09
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In order to overcome the existing speed sensor-based permanent magnet synchronous motor's rotor angle and speed estimation method, the principle is complicated, the calculation amount is large, and the slow dynamic characteristics will reduce the dynamic performance of the entire system, and even lead to system instability. Problems, now a kind of rotor angle and speed estimation method based on speed sensorless permanent magnet synchronous motor with high dynamic performance and easy to implement is proposed

Method used

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  • Speed sensor-less method for estimating rotor angle and revolving speed of permanent-magnet synchronous motor
  • Speed sensor-less method for estimating rotor angle and revolving speed of permanent-magnet synchronous motor
  • Speed sensor-less method for estimating rotor angle and revolving speed of permanent-magnet synchronous motor

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Embodiment 1

[0059] figure 1 It is a typical system block diagram of an existing speed sensor-based permanent magnet synchronous motor. The controlled object is a permanent magnet synchronous motor, and the actuator is a converter. The rectification unit rectifies the grid voltage and maintains the DC bus voltage of the converter constant, thereby ensuring the normal operation of the converter. The control system mainly includes three parts, the forward channel controller, the pulse width modulation unit and the rotor angle and speed estimation unit. The forward channel controller receives the given speed / torque command and reactive power / power factor command, and controls the component u of the stator voltage in the αβ coordinate system according to the stator current feedback and the estimated rotor angle and speed feedback. sα * , u sβ * . PWM unit for u sα * , u sβ * Modulate to generate the switching signal S required by the converter sa ,S sb ,S sc , and then drive the p...

Embodiment 2

[0096] In this embodiment, the method for estimating the rotor angle and rotational speed of the permanent magnet synchronous motor provided by the present invention is applied to a direct-drive wind power generation system based on a permanent magnet synchronous motor. The main parameters of the direct drive permanent magnet synchronous wind power generation system are as follows:

[0097] parameters

value

Permanent magnet synchronous generator rated capacity S N (MW)

1.5

Stator rated voltage U N (V)

690

Rated frequency f N (Hz)

11.5

Stator phase resistance ( mΩ )

3.0

Direct axis inductance L d ( mH )

2.9

Quadrature axis inductance L q ( mH )

2.9

Stator voltage pulse width modulation frequency f PWM (kHz)

2

[0098] Firstly, the rotor flux amplitude ψ of the permanent magnet synchronous motor r It can be calculated from the rated parameters: Then, follow f...

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Abstract

The invention relates to the technical field of electric transmission and control, in particular to a speed sensor-less method for estimating the rotor angle and the revolving speed of a permanent-magnet synchronous motor. The method comprises the following steps: a. obtaining the rotor flux linkage amplitude Psi<r> of a permanent-magnet synchronous motor; b. transforming a stator voltage fundamental component to be under an alpha beta coordinate system to obtain u<alpha> and u<beta>; c. transforming the stator current fundamental component to be under the alpha beta coordinate system to obtain i<alpha> and i<beta>; d. carrying out highpass filtering on stator current i<alpha> and i<beta> under the alpha beta coordinate system, and obtaining the differential estimation value sum of the stator current; e. obtaining a stator counter electromotive force estimation value; f. obtaining a rotor revolving speed calculation value omega<rC> and a rotor angle calculation value theta<rC>; g. carrying out lowpass filtering on the rotor revolving speed calculation value omega<rC> to obtain a rotor revolving speed estimation value; h. obtaining the estimation value of a rotor angle starting value; and i. obtaining a rotor angle estimation value. The method has the advantages that only forward calculation, instead of a feedback channel, exists in the method for estimating the rotor angle and revolving speed, and except filter delaying, no dynamic regulation process exists.

Description

technical field [0001] The invention relates to the technical field of electric transmission and control, and specifically relates to a method for estimating the rotor angle and rotational speed of a permanent magnet synchronous motor without a speed sensor. Background technique [0002] Due to its compact structure and reliable performance, permanent magnet synchronous motors have been widely used in wind power generation, electric vehicles, ship drives and other fields. Since the control of the permanent magnet synchronous motor is usually completed in the rotor rotating coordinate system, in order to complete the control of the permanent magnet synchronous motor, it is necessary to obtain the angle and speed of the rotor. There is a straightforward way to obtain this information using angle and rotational speed sensors. However, in many applications, the installation of angle and speed sensors increases the cost of installation and maintenance. At the same time, due to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P21/18
Inventor 周宏林吴建东况明伟
Owner DONGFANG ELECTRIC CORP LTD
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