Frequency converter parallel operation control system
A technology of control system and frequency converter, which is applied in the direction of control system, AC motor control, multiple motor speed adjustment, etc. It can solve the problems of reducing the reliability of frequency converter parallel expansion, frequency converter output out of synchronization, time out of synchronization, etc.
Active Publication Date: 2020-04-17
SHENZHEN INVT ELECTRIC
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Problems solved by technology
However, due to the different distances between the slaves of the inverters and the master of the inverter, the lengths of the drive signal transmission lines of each inverter are different, resulting in asynchronous timing of the drive signal reaching each inverter, which in turn leads to The output of the inverter is not synchronized, which reduces the reliability of the parallel expansion of the inverter
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[0032] The core of the present invention is to provide a frequency converter parallel control system, in which each frequency converter synchronously generates PWM signals to drive its own work, instead of directly generating PWM signals to drive each frequency converter directly by the frequency converter host, thus ensuring that all The synchronous work of the frequency converter improves the reliability of parallel expansion of the frequency converter.
[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of...
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The invention discloses a frequency converter parallel operation control system. The frequency converter parallel operation control system comprises a frequency converter, a plurality of communicationslave station modules and a communication master station module. The frequency converter host obtains a PWM comparison value according to a motor control algorithm, and the PWM comparison value is transmitted to a communication master station module by a host communication slave station module. The communication master station module periodically generates a synchronization signal to each frequency converter in combination with each communication slave station module, and correspondingly issues a PWM comparison value to each frequency converter through each communication slave station module.Each frequency converter synchronizes a self carrier signal after receiving the synchronization signal, and synchronously generates a PWM signal to the self power module according to the carrier signal and the PWM comparison value, so as to realize parallel output of each frequency converter to control the motor. Therefore, the PWM signals for driving the frequency converters to work are synchronously generated by the frequency converters, and the PWM signals for driving the frequency converters to work are not directly generated by the frequency converter host in a unified manner, so that the synchronous work of the frequency converters is ensured, and the reliability of parallel operation and capacity expansion of the frequency converters is improved.
Description
technical field [0001] The invention relates to the field of frequency converter parallel expansion, in particular to a frequency converter parallel control system. Background technique [0002] At present, the frequency converter parallel control system includes a frequency converter master and multiple frequency converter slaves, wherein the frequency converter master includes a controller for generating a driving signal for driving the frequency converter. In order to realize the synchronous output of each frequency converter in the frequency converter parallel control system, the technical means adopted is: through the hardware, the drive signal generated by the controller is divided into multiple drive signals, which are input to the power modules of each frequency converter one by one, so as to realize the Synchronous output of frequency converter. However, due to the different distances between the slaves of the inverters and the master of the inverter, the lengths o...
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IPC IPC(8): H02P5/50H02P27/04
CPCH02P5/50H02P27/04H02P27/045
Inventor 钟声
Owner SHENZHEN INVT ELECTRIC