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A galloping starting method based on power-frequency-to-variable-frequency switching of a nine-phase motor

A technology of flying car start and power frequency, applied in the field of frequency conversion control, can solve the problems of narrow application area and long waiting time of nine-phase motor, and achieve the effect of reducing waiting time and wide application field.

Inactive Publication Date: 2018-12-18
WOLONG ELECTRIC GRP LIAONING RONGXIN ELECTRIC TRANSMISSION CO LTD +2
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] (1) The existing three-phase inverter cannot drive the nine-phase motor to run, and the application area is slightly narrow;
[0005] (2) If the power frequency operation of the motor is to be switched to variable frequency operation, it is necessary to wait for the motor to come to a complete standstill before starting the frequency converter, and the waiting time is too long

Method used

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  • A galloping starting method based on power-frequency-to-variable-frequency switching of a nine-phase motor
  • A galloping starting method based on power-frequency-to-variable-frequency switching of a nine-phase motor
  • A galloping starting method based on power-frequency-to-variable-frequency switching of a nine-phase motor

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Embodiment Construction

[0022] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, a flying start method based on a nine-phase motor power frequency cut frequency conversion, including the following steps:

[0024] Step 1. After the motor is switched from power frequency to variable frequency, the inverter first sets an initial output voltage for the rotating motor, and at the same time the given frequency of the inverter gradually ramps down from the rated frequency to 0Hz;

[0025] The initial output voltage is given according to the "full-scale" voltage, which is 5% to 20% of the rated voltage Ue, and is adjusted within 5% to 20% of Ue according to the resistance of the motor stator to ensure that the current is within the rated range. While limiting the output current, it builds negative feedback on the voltage output to automatically suppress overcurrent.

[0026] Step 2,...

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Abstract

The invention provides a galloping starting method based on power-frequency-to-variable-frequency switching of a nine-phase motor, comprising the following steps: first, after the motor is switched from power frequency to variable frequency, the frequency converter first gives an initial output voltage of the motor in rotation, and at the same time, the given frequency of the frequency converter is gradually ramped down from the rated frequency to 0 Hz; 2, detecting the nine-phase current of the rotating electric machine, transforming the 9 s -> 2 r coordinate vector, and decomposing the vector; 3, judging the inflection point of the frequency search of the rotating electric machine; When the mode length of the nine-phase current vector decomposition is detected to have an ''inflection point'', the rotational frequency of the motor is searched; 4, carry out frequency conversion operation after the frequency inflection point is successfully search, returning the output voltage to the corresponding "fullness" voltage at the frequency in the V / F curve of the frequency converter, output the output voltage to the motor to reach the frequency conversion stable operation of the motor, andstarting the motor successfully; The nine-phase motor can be directly switched from power-frequency operation to variable-frequency operation without waiting for the motor to be stationary.

Description

technical field [0001] The invention relates to the technical field of frequency conversion control, in particular to a flying car starting method based on power frequency cut and frequency conversion of a nine-phase motor. Background technique [0002] In the existing technology, if the power frequency operation is to be switched to variable frequency operation, the inverter needs to wait for the motor to be completely static before starting the inverter, and even if there are inverters that start on the fly, most of them are three-phase inverters. For those that do not allow the motor to stop For the field, the function of the frequency converter is limited, and the application area is slightly narrow. [0003] The technical problem to be solved in the present invention is: [0004] (1) The existing three-phase inverter cannot drive the nine-phase motor to run, and the application area is slightly narrow; [0005] (2) If the power frequency operation of the motor is to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/04H02P25/22H02P1/26
CPCH02P1/26H02P25/22H02P27/047
Inventor 魏洪实王建乔王绪宝张巍金庆才郑忠明高越鲁俊王东伟赵松
Owner WOLONG ELECTRIC GRP LIAONING RONGXIN ELECTRIC TRANSMISSION CO LTD
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