Communication system of cascaded converter module unit and control method thereof

Abstract

The invention discloses a communication system of a cascaded converter module unit and a control method of thereof. The communication system comprises a data sending module and a data receiving module; if no fault occurs, the data sending module sends a frequency coding signal of an analog quantity to the data receiving module; if a fault occurs, each semaphore is connected with a corresponding frequency generator through a D trigger, the semaphore frequency with the highest priority is selected and sent to a multiplexer according to priorities among different semaphore, and the semaphore frequency is sent to a data receiving module through an optical fiber sending interface circuit; and the data receiving module searches and determines a specific instruction value in the state table according to the control instruction frequency, and then performs connection to the corresponding switching device. According to the technical scheme, compared with a traditional packet communication framepackaging mode, the logic is simpler, and compared with a traditional serial communication mode, the transmission speed is higher; the influence caused by high-voltage electromagnetic interference isovercome to the greatest extent, and the expansibility is good.

Description

technical field [0001] The invention belongs to the technical field of application of communication technology in power systems, and in particular relates to a modular unit optical fiber communication system of cascaded converters and a control method thereof. Background technique [0002] Due to the high voltage level and large rated capacity of the cascaded converter, the overall operating environment of the system is relatively complex, so there is relatively large electromagnetic interference in the actual operation process. On the other hand, due to the high power of its power module, when it fails, it will have a significant impact on the output of the cascaded converter. Therefore, no matter from the perspective of system reliability or equipment stability, it is necessary to have the ability to quickly respond to faults. The traditional packet communication frame encapsulation method has problems such as slow response speed and difficult implementation due to the sho...

AI Technical Summary

Problems solved by technology

The traditional packet communication frame encapsulation method has problems such as slow response speed and difficult implementation due to the shortcomings of multiple layers of communication protocol encapsulation and complex protocol stack.

Due to the shortcomings of low communication code rate, the traditional serial communication method has the problem of slow communication speed, which needs to be improved

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