Communication and synchronization system for complex power electronic distributed control

Abstract

The present invention provides a communication and synchronization system for complex power electronic distributed control. The system comprises multiple subsystems, and each subsystem contains a subsystem master control unit and multiple sub-control units, wherein subsystem master control units of the subsystems are connected through fibers, so as to form a system-level bidirectional ring communication network, and control information, protection information and clock synchronization information among the subsystems are transmitted by using the system-level bidirectional ring communication network; and inside each subsystem, the subsystem master control unit and the multiple sub-control units are connected through fibers, so as to form a subsystem-level bidirectional ring communication network, and real-time control and clock synchronization between the subsystem master control unit and the sub-control units are implemented by using the subsystem-level bidirectional ring communication network. According to the communication and synchronization system for complex power electronic distributed control, various redundant units are set to improve system reliability, so that a communication network is simplified, and reliability of a communication and synchronization network is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a communication and synchronization system for complex power electronics distributed control. Background technique [0002] With the development of power electronics technology, the modular power unit composed of fully controlled semiconductor power devices is more intelligent in function, and a distributed complex power electronic system is composed of multiple power units. The control system needs to have high real-time, high-precision synchronization, and large-scale communication functions to meet the sampling, data transmission, and real-time control functions of each unit. On the other hand, the operating environment of high-power power electronic control systems such as wind power converter systems and photovoltaic power generation systems is relatively harsh, such as electromagnetic interference, vibration, corrosion, etc. In the case of unit failure, it still ...

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Problems solved by technology

[0006] 1. Distributed structure: The distributed system in this patent adopts a star structure with one master and multiple slaves. For a complex system with a large number of distributed units, the master control unit in this structure will become very complicated and difficult to accomplish;

[0007] 2. Communication and synchronization reliability: The communication and synchronization of the system in this patent is heavily dependent on the main control unit. Once the main control unit fails, the system will be out of control or paralyzed

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