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Control Method of Permanent Magnet Motor with High Power Factor Diode Rectifier Using Small Capacitance Film Capacitor

A diode rectifier, high power factor technology, used in motor generator control, electronic commutation motor control, motor control, etc., to increase the conduction width, improve harmonic performance, and improve dynamic performance.

Active Publication Date: 2019-12-06
SHANGHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The drive system is not suitable for high-performance drives with high torque and high speed regulation

Method used

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  • Control Method of Permanent Magnet Motor with High Power Factor Diode Rectifier Using Small Capacitance Film Capacitor
  • Control Method of Permanent Magnet Motor with High Power Factor Diode Rectifier Using Small Capacitance Film Capacitor
  • Control Method of Permanent Magnet Motor with High Power Factor Diode Rectifier Using Small Capacitance Film Capacitor

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Embodiment Construction

[0029] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, and the examples given are only for explaining the present invention, and are not intended to limit the scope of the present invention.

[0030] see figure 1 , a method for controlling a permanent magnet motor with a high power factor diode rectifier using a small-capacity film capacitor, comprising the following steps:

[0031] S1. Through the power relationship of the drive system, the given value of the d-q axis current that makes the instantaneous input power of the inverter sinusoidal is calculated offline and stored in the look-up table;

[0032] S2. Select d-q-axis given current and d-q-axis real-time current input PWM predictive controller from the average input power and real-time speed to control the given current, and predict the actual current to track the given current according to the system mathematical model d-q axis...

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Abstract

The invention provides a high power factor diode rectifier permanent magnet motor control method adopting a low capacity thin film capacitor. According to the method, a d-q axis specified is obtained via optimization algorithm-based off line calculation, and a PWM prediction controller is adopted for replacing a PI current controller based on conventional vector control. To compensate deviation between expected inverter output power and output power calculated based on a real time motor current and specific voltage, a voltage correction vector is added. A novel over-modulation algorithm is adopted; while voltage outputting capability of an inverter is increased, the specific voltage of a corrected inverter is enabled to be always in an inverter output voltage limiting scope. According to the control method, application of grid side high power factor control does not require any extra power factor correction circuit or input wave filter, and an input current harmonic wave component of a power grid can be suppressed. Compared with a conventional motor driver, a motor driving control solution put forward in the invention is markedly advantageous in terms of cost, size and reliability.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a high power factor diode rectifier permanent magnet motor control method using a small-capacity film capacitor. Background technique [0002] In recent years, variable frequency speed regulation permanent magnet motor drive system has been widely used in household appliances, such as air conditioners, washing machines and refrigerators. While variable speed drives have improved energy efficiency in home appliance applications, the widespread use of power electronics has significantly increased the stress on the grid from current harmonics. [0003] In traditional single-phase AC input inverter motor drive systems, large electrolytic capacitors are usually used on the DC bus side to stabilize the bus voltage. However, large electrolytic capacitors have defects such as large volume and short life, and in order to improve the quality of grid-side current, it is generally nec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P27/08H02P27/12H02P29/50
CPCH02P21/14H02P27/08H02P27/12
Inventor 宋文祥林宏民冯九一
Owner SHANGHAI UNIV
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