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Asynchronous motor constant voltage frequency ratio control method used for three-phase frequency converter

A technology for asynchronous motors and control methods, applied in the direction of AC motor control, control systems, electrical components, etc., can solve problems such as low-speed torque drop, poor speed accuracy, low-frequency oscillation, etc., achieve oscillation suppression, simple and practical methods, and stable systems sex enhancing effect

Active Publication Date: 2017-03-29
BEIJING LEADER & HARVEST ELECTRIC TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] It can be seen from the above that the traditional constant voltage frequency ratio control method has problems such as low-speed torque drop, low-frequency oscillation, and poor speed accuracy. Therefore, in order to improve the competitiveness of asynchronous motors and make them more widely used, their performance must be further improved, especially low speed performance

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  • Asynchronous motor constant voltage frequency ratio control method used for three-phase frequency converter
  • Asynchronous motor constant voltage frequency ratio control method used for three-phase frequency converter
  • Asynchronous motor constant voltage frequency ratio control method used for three-phase frequency converter

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Embodiment Construction

[0019] The constant voltage-frequency ratio control method for an asynchronous motor of the present invention is designed for the asynchronous motor 50 used in the common three-phase frequency converter 10 . Three-phase inverters can be high-voltage or low-voltage inverters, and can be various types of inverters without limitation. figure 2 The structure of the cascaded high-voltage frequency converter applicable to the present invention is shown. When understanding the implementation process of the present invention, the cascaded high-voltage frequency converter can be taken as an example for understanding.

[0020] Such as figure 2 , the cascaded high-voltage frequency converter includes a high-voltage power supply 11, a phase-shifting transformer 12, and consists of 3×n power units 131 (3×n power units C are shown in the figure 1w ~C nw 、C 1v ~C nv 、C 1u ~C nu The power circuit 13 constituted by the case), the high-voltage power supply 11 is connected to the power c...

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Abstract

The invention discloses an asynchronous motor constant voltage frequency ratio control method used for a three-phase frequency converter. The asynchronous motor constant voltage frequency ratio control method comprises a main control step, and additionally a feedback compensation step is added onto the main control step; and the feedback compensation step comprises a stator resistance voltage drop compensation step, a stator voltage amplitude compensation step and a slip frequency compensation step. According to the method, the load starting performance, low-frequency load capacity and speed accuracy of an asynchronous motor are improved, the load starting torque can reach 115% of rated load, and the asynchronous motor can stably operate in a full-load mode at the low frequency of 1 Hz, and the revolving speed error can be controlled within 0.1 Hz, so that the asynchronous motor can stably operate in the frequency band of 0 to 50 Hz, the oscillation of the asynchronous motor is well inhibited, the system stability is effectively improved, and the method is applicable to being widely spread and applied.

Description

technical field [0001] The invention relates to a constant-voltage-frequency-ratio control method for an asynchronous motor of a three-phase frequency converter, belonging to the technical field of frequency conversion and speed regulation of asynchronous motors. Background technique [0002] Because the AC speed control system has inherent advantages over the DC speed control system, the AC drive control system has become the main development direction in the field of electric drive control. According to the different control parameters, the AC speed regulation system can be divided into three categories: variable speed speed regulation, variable slip speed regulation, and frequency conversion speed regulation. Among them, the frequency conversion speed regulation system of asynchronous motor is the most widely used, and has replaced the DC speed regulation system. the trend of. [0003] The frequency conversion speed regulation system changes the synchronous rotation spee...

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Application Information

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IPC IPC(8): H02P27/04
CPCH02P27/047
Inventor 贺艳晖郑巨明
Owner BEIJING LEADER & HARVEST ELECTRIC TECH
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