Converter parallel operation control method and converter parallel operation control system

Abstract

The application discloses a converter parallel operation control method and a converter parallel operation control system. The system comprises an EtherCAT master station and the EtherCAT slave stations which are in one-to-one correspondence arrangement with the converters, each EtherCAT master station comprises a slave station controller and a microprocessor, and the EtherCAT master station and the EtherCAT slave stations are connected into a bus-type network topology structure. The EtherCAT slave station controllers are used to generate the synchronizing signals to send to the correspondingmicroprocessors, and the microprocessors load the values of the time reference phase registers as the counting initial values that the time reference counters count to generate the triangular carrierswhen the rising edges or the falling edges of the synchronizing signals occur, wherein the values of the time reference phase registers and the values of the periodic quantities of the time referencecounters satisfy the situation that the loading moments always occur when or before the nadir points of the triangular carriers arrive. According to the application, the synchronism of the carriers at the converter parallel operation is improved.

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 ...

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.

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