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Method for controlling synchronous switch change in medium voltage inverter

A frequency converter and medium-voltage technology, which is applied in the field of synchronous switching control of medium-voltage frequency converters, can solve problems such as over-current cut-off of commercial power supplies, over-current faults of medium-voltage frequency converters, and high-voltage accidents in switching operations, so as to prevent synchronous switching glitch effect

Active Publication Date: 2015-07-01
LSIS CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] However, since in the case of applying a high voltage power supply, such as figure 1 The synchronous switching of the traditional medium-voltage inverter shown is used to control the switching on or off, and the failure of the switching operation may cause high-voltage accidents
[0007] In addition, when the medium-voltage inverter drives the motor while the switch of the commercial power supply is kept ON, both power supplies are applied to both ends of the reactor, and then current is generated through the voltage difference between the two power supplies, which may Can cause accidents in medium voltage drives and commercial power supplies
And in the case where a large amount of current flows due to a large voltage difference, there may be problems such as overcurrent cutoff of commercial power supplies, overcurrent faults of medium voltage inverters, etc.

Method used

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  • Method for controlling synchronous switch change in medium voltage inverter
  • Method for controlling synchronous switch change in medium voltage inverter
  • Method for controlling synchronous switch change in medium voltage inverter

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Embodiment Construction

[0024] Hereinafter, exemplary embodiments will be described more fully with reference to the accompanying drawings in which some exemplary embodiments are shown. Inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. On the contrary, the described scheme is intended to cover all such alternatives, modifications, variations and equivalents which fall within the scope and novel concepts of the present disclosure.

[0025] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0026] figure 2 is an exemplary view briefly showing the structure of a medium-voltage frequency converter synchronous switching system according to an exemplary embodiment of the present disclosure.

[0027] like figure 2 As shown, when the switch K2 is ON and the switch K3 is OFF, the motor 10 is in the inverter mode to re...

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Abstract

A method for controlling synchronous switching in a medium voltage inverter is disclosed. The method includes lighting on a first lamp to notify that a switching operation is ready by ascertaining that the medium voltage inverter is in a normal operation, lighting on a second lamp to notify that a switching operation is under way when receiving an input of switching action, and lighting on a third lamp to notify that the switching operation is completed when the switching action is completed.

Description

technical field [0001] The invention relates to a synchronous switching control method of a medium voltage inverter. Background technique [0002] In medium-voltage inverters, electrical shocks caused by various causes are applied to the motor, inverter, and commercial power during the switching operation between the output power of the inverter and the commercial power. [0003] The electric shock is generated by the momentary intermittent section, which is generated in the section where the switches of the commercial power supply and the frequency converter are both turned on during the switching action. In order to reduce the electrical shock caused by the voltage generated when the voltage input to the motor is switched from the inverter output to the commercial power supply, the amplitude and phase of the inverter output and the commercial power supply should be adjusted to be consistent with each other. [0004] figure 1 is an exemplary view showing synchronous switc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P4/00
CPCH02P4/00H02J9/068H02M1/20H02M7/42H02M7/48H02P27/06
Inventor 金敬垂
Owner LSIS CO LTD
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