Synchronization system and synchronization method for modular multilevel pulse width modulation

Abstract

The invention provides a synchronization system and a synchronization method for modular multilevel pulse width modulation. The synchronization system includes a main control unit and at least one slave control unit, wherein the main control unit includes a main controller and a first CAN controller and a CAN transceiver, and the slave control unit includes a module controller, a second CAN controller, and a second CAN transceiver. A transmitting end and a receiving end of the first CAN controller are respectively connected to transmitting and receiving ends of the first CAN controller. A transmitting end and a receiving end of the second CAN controller are respectively connected to the transmitting end and the receiving end of the second CAN controller. The receiving end of the second CANcontroller is also connected to the IO end of the module controller. The synchronization system combines with a communication protocol and hardware detection, and uses an IO port to capture level change and is a hardware-based method. The system is fast in response speed, and is advantaged by few hardware circuits and high synchronization precision.

Description

technical field [0001] The invention belongs to the technical field of circuit control, and in particular relates to a modular multilevel pulse width modulation synchronization system and synchronization method. Background technique [0002] In some circuits based on module combination, the control of each module needs to be issued according to a certain fixed timing, so the controllers of each module need to be synchronized. For example, in a modular multilevel converter (MMC), when carrier phase-shift control is used, the control signal of the module is the ratio of the power semiconductor devices in the module to be turned on and off, and the power semiconductor devices in different modules must also be turned on and off. Strictly synchronized. [0003] The real-time requirements for the transmission of control signals are lower, and communication methods are often used. Synchronization requires high real-time performance, so hardware signal line synchronization is most...

AI Technical Summary

Problems solved by technology

Synchronization requires high real-time performance, so hardware signal line synchronization is most commonly used. Using hardware synchronization signal lines in large or complex systems requires complex wiring and high costs.

Another method is to use the communication method for synchronization, but the communication protocol often requires some judgment and fault tolerance processing, which may cause some delays and lead to inaccurate synchronization

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