Method for switching variable frequency into power frequency, frequency changer and power switching system

A frequency converter, power frequency technology, applied in the field of motor control, can solve problems such as increasing product cost and increasing synchronous switching reactors

Active Publication Date: 2017-05-31
INVT POWER ELECTRONICS SUZHOU CO LTD
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Problems solved by technology

Although the inrush current generated by this switching method is small, it need

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  • Method for switching variable frequency into power frequency, frequency changer and power switching system
  • Method for switching variable frequency into power frequency, frequency changer and power switching system
  • Method for switching variable frequency into power frequency, frequency changer and power switching system

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[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0017] It should be understood that when used in this specification and the appended claims, the terms "including" and "including" indicate the existence of the described features, wholes, steps, operations, elements and / or components, but do not exclude one or The existence or addition of multiple other features, wholes, steps, operations, elements, components, and / or collections thereof.

[0018] See figure 1 , Is a structural block diagram of a power switchin...

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Abstract

The embodiment of the invention discloses a method for switching variable frequency into power frequency. The method comprises the following steps: obtaining the phase sequence, the phase position and the frequency of a power frequency signal output by a second high voltage bus; judging whether the phase sequence of a variable frequency signal output by a frequency changer is consistent with the phase sequence of the power frequency signal or not; if the phase sequence of the variable frequency signal output by the frequency changer is consistent with the phase sequence of the power frequency signal, obtaining current active current, calculating a current frequency descent rate generated by switching under a current state according to the current active current, reference active current and a reference frequency descent rate, calculating attenuation frequency and a compensation phase position in a switching time according to the current frequency descent rate and the switching time, regulating the frequency of the variable frequency signal to be the sum of the attenuation frequency and the frequency of the power frequency signal, and regulating the phase lag compensation phase position of a phase position relative power frequency signal of the variable frequency signal; and controlling a second contactor to be switched off and a third contactor to be closed. The embodiment of the invention also discloses a frequency changer and a power switching system. According to the embodiment of the invention, impulse current can be avoided when a variable frequency way is changed into the power frequency.

Description

Technical field [0001] The present invention relates to the technical field of motor control, in particular to a method for frequency conversion and switching power frequency, a frequency converter and a power switching system. Background technique [0002] In recent years, with the market promotion of frequency converters, especially in the wide application of electric power, metallurgy, coal, petroleum and other industries, the flexibility of high-voltage frequency conversion equipment power distribution system schemes and the reliability and continuity of equipment operation have been proposed higher Claim. In many applications, it is necessary to switch the motor from frequency conversion mode to industrial frequency mode. In order to avoid the large inrush current when the motor is switched from the frequency conversion mode to the power frequency mode, at present, the reactor is mainly connected in series at the output end of the inverter, and the frequency and phase of th...

Claims

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Application Information

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IPC IPC(8): H02P27/00H02P27/04
CPCH02P27/00H02P27/04
Inventor 桂峰凡念陈星陈杰王宜昶
Owner INVT POWER ELECTRONICS SUZHOU CO LTD
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