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A control method and control system for parallel operation of converters

An operation control and converter technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of converter circulating current, high carrier synchronization requirements, affecting the stability and reliability of parallel systems, etc. Avoid timing disorder and achieve the effect of carrier synchronization

Active Publication Date: 2020-05-22
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the converters are running in parallel, the synchronization of the carrier is very demanding. The out-of-synchronization of the carrier will lead to a circulating current between the converters, which will affect the stability and reliability of the entire parallel system.

Method used

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  • A control method and control system for parallel operation of converters
  • A control method and control system for parallel operation of converters
  • A control method and control system for parallel operation of converters

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] see figure 1 , the embodiment of the present invention discloses a method for controlling the parallel operation of converters, which is applied to such as figure 2 The shown converters operate the control system in parallel.

[0036] The structure of the converter parallel operation control system is briefly summarized as follows: the converter parallel operation control system includes an EtherCAT master station and an EtherCAT slave station corresp...

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Abstract

The application discloses a control method and a control system for parallel operation of converters. The system includes an EtherCAT master station and an EtherCAT slave station corresponding to each parallel converter; the EtherCAT slave station includes a slave station controller and a microprocessor Device; The EtherCAT master station and each EtherCAT slave station are connected into a bus network topology. The EtherCAT slave station controller is used to generate a synchronization signal and send it to the corresponding microprocessor; when the synchronization signal has a rising edge or a falling edge, the microprocessor loads the value of the time reference phase register as a time reference counter to generate a triangular carrier wave wherein, the value of the time reference phase register and the value of the period value of the time reference counter satisfy that the loading moment always occurs when the bottom point of the triangular carrier wave arrives or before. The application improves the synchronization of the carrier wave when the converters are running in parallel.

Description

technical field [0001] The invention relates to the technical field of industrial automation control, and more specifically, to a control method and a control system for parallel operation of converters. Background technique [0002] Parallel connection of converters is one of the main ways to expand the capacity of converters. When the converters are running in parallel, the synchronization of the carrier is highly required. The out-of-synchronization of the carrier will cause a circulating current between the converters, which will affect the stability and reliability of the entire parallel system. Contents of the invention [0003] In view of this, the present invention provides a control method and a control system for the parallel operation of converters, so as to improve the synchronization of the carrier wave during the parallel operation of the converters. [0004] A method for controlling the parallel operation of converters, which is applied to a control system ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0012
Inventor 刘长坤张虎邓立荣程尧
Owner SUNGROW POWER SUPPLY CO LTD
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