Control system and method for synchronous switching of frequency converter and industrial frequency converter

A frequency converter and control module technology, applied in the direction of converting AC power input to AC power output, output power conversion devices, electrical components, etc., can solve the problems of large load impact and damage, large load impact, and high cost, and achieve guaranteed Phase synchronization, shock reduction effect
CN103856067BActive Publication Date: 2017-12-19SHENZHEN INVT ELECTRIC
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SHENZHEN INVT ELECTRIC
Publication Date
2017-12-19

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Abstract

The embodiment of the present invention discloses a frequency converter, industrial frequency conversion synchronous switching control system and method, which ensures that the voltage phase at the input terminal of the load is synchronized with the mains voltage phase, reduces the impact on the load and the frequency converter when the industrial frequency conversion is switched, and improves the system stability. . The frequency converter provided by the embodiment of the present invention includes: a voltage detection circuit, a phase-locked control module and a main circuit, the voltage detection circuit is connected with the phase-locked control module, and an inverter output terminal is provided on the main circuit; the voltage detection circuit includes a mains The detection circuit and the load detection circuit, the input end of the mains detection circuit is connected with the voltage output end of the mains to detect the mains voltage, and the input end of the load detection circuit is connected with the load voltage input end to detect the load input voltage; When the phase of the voltage at the load input terminal is inconsistent with the phase of the mains voltage, the phase lock control module makes the phase of the voltage at the load input terminal consistent with the phase of the mains voltage by controlling the voltage phase of the inverter output terminal.
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Description

technical field

[0001] The invention relates to the field of electromechanical control, in particular to a frequency converter and an industrial frequency conversion synchronous switching control system and method. Background technique

[0002] The traditional frequency converter with phase-locking function is mainly used for phase-locking the mains power supply and the inverter output of the frequency converter, so as to realize the switching between industrial frequency and variable frequency. If there is a transformer or filter that produces a phase shift between the inverter output of the inverter and the load, the inverter voltage will cause a phase shift of the original inverter output voltage after passing through the transformer or filter, resulting in a phase shift in the inverter output. There is a phase difference between the voltage and the load input terminal voltage, and the traditional inverter with phase-locking function cannot detect this phase difference at...

Claims

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